The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.widget; |
| 18 | |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 19 | import android.annotation.Nullable; |
Alan Viverette | 23f4432 | 2015-04-06 16:04:56 -0700 | [diff] [blame] | 20 | import android.os.Bundle; |
Romain Guy | 5fade8c | 2013-07-10 16:36:18 -0700 | [diff] [blame] | 21 | import android.os.Trace; |
Gilles Debunne | fd3ddfa | 2010-02-17 16:59:20 -0800 | [diff] [blame] | 22 | import com.android.internal.R; |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 23 | import com.android.internal.util.Predicate; |
Gilles Debunne | fd3ddfa | 2010-02-17 16:59:20 -0800 | [diff] [blame] | 24 | import com.google.android.collect.Lists; |
| 25 | |
Tor Norbye | 7b9c912 | 2013-05-30 16:48:33 -0700 | [diff] [blame] | 26 | import android.annotation.IdRes; |
Siva Velusamy | 94a6d15 | 2015-05-05 15:07:00 -0700 | [diff] [blame] | 27 | import android.annotation.NonNull; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 28 | import android.content.Context; |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 29 | import android.content.Intent; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 30 | import android.content.res.TypedArray; |
| 31 | import android.graphics.Canvas; |
Romain Guy | 8f1344f5 | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 32 | import android.graphics.Paint; |
Gilles Debunne | fd3ddfa | 2010-02-17 16:59:20 -0800 | [diff] [blame] | 33 | import android.graphics.PixelFormat; |
| 34 | import android.graphics.Rect; |
Gilles Debunne | fd3ddfa | 2010-02-17 16:59:20 -0800 | [diff] [blame] | 35 | import android.graphics.drawable.Drawable; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 36 | import android.util.AttributeSet; |
alanv | 30ee76c | 2012-09-07 10:31:16 -0700 | [diff] [blame] | 37 | import android.util.MathUtils; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 38 | import android.util.SparseBooleanArray; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 39 | import android.view.FocusFinder; |
| 40 | import android.view.KeyEvent; |
Gilles Debunne | fd3ddfa | 2010-02-17 16:59:20 -0800 | [diff] [blame] | 41 | import android.view.SoundEffectConstants; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 42 | import android.view.View; |
| 43 | import android.view.ViewDebug; |
| 44 | import android.view.ViewGroup; |
Siva Velusamy | 94a6d15 | 2015-05-05 15:07:00 -0700 | [diff] [blame] | 45 | import android.view.ViewHierarchyEncoder; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 46 | import android.view.ViewParent; |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 47 | import android.view.ViewRootImpl; |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 48 | import android.view.accessibility.AccessibilityNodeInfo; |
Alan Viverette | 23f4432 | 2015-04-06 16:04:56 -0700 | [diff] [blame] | 49 | import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction; |
Alan Viverette | 5b2081d | 2013-08-28 10:43:07 -0700 | [diff] [blame] | 50 | import android.view.accessibility.AccessibilityNodeInfo.CollectionInfo; |
| 51 | import android.view.accessibility.AccessibilityNodeInfo.CollectionItemInfo; |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 52 | import android.view.accessibility.AccessibilityNodeProvider; |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 53 | import android.widget.RemoteViews.RemoteView; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 54 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 55 | import java.util.ArrayList; |
| 56 | |
| 57 | /* |
| 58 | * Implementation Notes: |
| 59 | * |
| 60 | * Some terminology: |
| 61 | * |
| 62 | * index - index of the items that are currently visible |
| 63 | * position - index of the items in the cursor |
| 64 | */ |
| 65 | |
| 66 | |
| 67 | /** |
| 68 | * A view that shows items in a vertically scrolling list. The items |
| 69 | * come from the {@link ListAdapter} associated with this view. |
| 70 | * |
Scott Main | 4c359b7 | 2012-07-24 15:51:27 -0700 | [diff] [blame] | 71 | * <p>See the <a href="{@docRoot}guide/topics/ui/layout/listview.html">List View</a> |
| 72 | * guide.</p> |
Scott Main | 41ec653 | 2010-08-19 16:57:07 -0700 | [diff] [blame] | 73 | * |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 74 | * @attr ref android.R.styleable#ListView_entries |
| 75 | * @attr ref android.R.styleable#ListView_divider |
| 76 | * @attr ref android.R.styleable#ListView_dividerHeight |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 77 | * @attr ref android.R.styleable#ListView_headerDividersEnabled |
| 78 | * @attr ref android.R.styleable#ListView_footerDividersEnabled |
| 79 | */ |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 80 | @RemoteView |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 81 | public class ListView extends AbsListView { |
| 82 | /** |
| 83 | * Used to indicate a no preference for a position type. |
| 84 | */ |
| 85 | static final int NO_POSITION = -1; |
| 86 | |
| 87 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 88 | * When arrow scrolling, ListView will never scroll more than this factor |
| 89 | * times the height of the list. |
| 90 | */ |
| 91 | private static final float MAX_SCROLL_FACTOR = 0.33f; |
| 92 | |
| 93 | /** |
| 94 | * When arrow scrolling, need a certain amount of pixels to preview next |
| 95 | * items. This is usually the fading edge, but if that is small enough, |
| 96 | * we want to make sure we preview at least this many pixels. |
| 97 | */ |
| 98 | private static final int MIN_SCROLL_PREVIEW_PIXELS = 2; |
| 99 | |
| 100 | /** |
| 101 | * A class that represents a fixed view in a list, for example a header at the top |
| 102 | * or a footer at the bottom. |
| 103 | */ |
| 104 | public class FixedViewInfo { |
| 105 | /** The view to add to the list */ |
| 106 | public View view; |
| 107 | /** The data backing the view. This is returned from {@link ListAdapter#getItem(int)}. */ |
| 108 | public Object data; |
| 109 | /** <code>true</code> if the fixed view should be selectable in the list */ |
| 110 | public boolean isSelectable; |
| 111 | } |
| 112 | |
| 113 | private ArrayList<FixedViewInfo> mHeaderViewInfos = Lists.newArrayList(); |
| 114 | private ArrayList<FixedViewInfo> mFooterViewInfos = Lists.newArrayList(); |
| 115 | |
| 116 | Drawable mDivider; |
| 117 | int mDividerHeight; |
Adam Cohen | fb60386 | 2010-12-17 12:03:17 -0800 | [diff] [blame] | 118 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 119 | Drawable mOverScrollHeader; |
| 120 | Drawable mOverScrollFooter; |
| 121 | |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 122 | private boolean mIsCacheColorOpaque; |
| 123 | private boolean mDividerIsOpaque; |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 124 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 125 | private boolean mHeaderDividersEnabled; |
| 126 | private boolean mFooterDividersEnabled; |
| 127 | |
| 128 | private boolean mAreAllItemsSelectable = true; |
| 129 | |
| 130 | private boolean mItemsCanFocus = false; |
| 131 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 132 | // used for temporary calculations. |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 133 | private final Rect mTempRect = new Rect(); |
Romain Guy | a02903f | 2009-05-23 13:26:46 -0700 | [diff] [blame] | 134 | private Paint mDividerPaint; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 135 | |
| 136 | // the single allocated result per list view; kinda cheesey but avoids |
| 137 | // allocating these thingies too often. |
Romain Guy | 9c3184cc | 2010-02-25 17:32:54 -0800 | [diff] [blame] | 138 | private final ArrowScrollFocusResult mArrowScrollFocusResult = new ArrowScrollFocusResult(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 139 | |
Adam Powell | 9bf3c12 | 2010-02-26 11:32:07 -0800 | [diff] [blame] | 140 | // Keeps focused children visible through resizes |
| 141 | private FocusSelector mFocusSelector; |
Adam Powell | 8350f7d | 2010-07-28 14:27:28 -0700 | [diff] [blame] | 142 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 143 | public ListView(Context context) { |
| 144 | this(context, null); |
| 145 | } |
| 146 | |
| 147 | public ListView(Context context, AttributeSet attrs) { |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 148 | this(context, attrs, R.attr.listViewStyle); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 149 | } |
| 150 | |
Alan Viverette | 617feb9 | 2013-09-09 18:09:13 -0700 | [diff] [blame] | 151 | public ListView(Context context, AttributeSet attrs, int defStyleAttr) { |
| 152 | this(context, attrs, defStyleAttr, 0); |
| 153 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 154 | |
Alan Viverette | 617feb9 | 2013-09-09 18:09:13 -0700 | [diff] [blame] | 155 | public ListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { |
| 156 | super(context, attrs, defStyleAttr, defStyleRes); |
| 157 | |
| 158 | final TypedArray a = context.obtainStyledAttributes( |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 159 | attrs, R.styleable.ListView, defStyleAttr, defStyleRes); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 160 | |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 161 | final CharSequence[] entries = a.getTextArray(R.styleable.ListView_entries); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 162 | if (entries != null) { |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 163 | setAdapter(new ArrayAdapter<>(context, R.layout.simple_list_item_1, entries)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 164 | } |
| 165 | |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 166 | final Drawable d = a.getDrawable(R.styleable.ListView_divider); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 167 | if (d != null) { |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 168 | // Use an implicit divider height which may be explicitly |
| 169 | // overridden by android:dividerHeight further down. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 170 | setDivider(d); |
| 171 | } |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 172 | |
| 173 | final Drawable osHeader = a.getDrawable(R.styleable.ListView_overScrollHeader); |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 174 | if (osHeader != null) { |
| 175 | setOverscrollHeader(osHeader); |
| 176 | } |
| 177 | |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 178 | final Drawable osFooter = a.getDrawable(R.styleable.ListView_overScrollFooter); |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 179 | if (osFooter != null) { |
| 180 | setOverscrollFooter(osFooter); |
| 181 | } |
| 182 | |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 183 | // Use an explicit divider height, if specified. |
| 184 | if (a.hasValueOrEmpty(R.styleable.ListView_dividerHeight)) { |
| 185 | final int dividerHeight = a.getDimensionPixelSize( |
| 186 | R.styleable.ListView_dividerHeight, 0); |
| 187 | if (dividerHeight != 0) { |
| 188 | setDividerHeight(dividerHeight); |
| 189 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | mHeaderDividersEnabled = a.getBoolean(R.styleable.ListView_headerDividersEnabled, true); |
| 193 | mFooterDividersEnabled = a.getBoolean(R.styleable.ListView_footerDividersEnabled, true); |
| 194 | |
| 195 | a.recycle(); |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * @return The maximum amount a list view will scroll in response to |
| 200 | * an arrow event. |
| 201 | */ |
| 202 | public int getMaxScrollAmount() { |
| 203 | return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * Make sure views are touching the top or bottom edge, as appropriate for |
| 208 | * our gravity |
| 209 | */ |
| 210 | private void adjustViewsUpOrDown() { |
| 211 | final int childCount = getChildCount(); |
| 212 | int delta; |
| 213 | |
| 214 | if (childCount > 0) { |
| 215 | View child; |
| 216 | |
| 217 | if (!mStackFromBottom) { |
| 218 | // Uh-oh -- we came up short. Slide all views up to make them |
| 219 | // align with the top |
| 220 | child = getChildAt(0); |
| 221 | delta = child.getTop() - mListPadding.top; |
| 222 | if (mFirstPosition != 0) { |
| 223 | // It's OK to have some space above the first item if it is |
| 224 | // part of the vertical spacing |
| 225 | delta -= mDividerHeight; |
| 226 | } |
| 227 | if (delta < 0) { |
| 228 | // We only are looking to see if we are too low, not too high |
| 229 | delta = 0; |
| 230 | } |
| 231 | } else { |
| 232 | // we are too high, slide all views down to align with bottom |
| 233 | child = getChildAt(childCount - 1); |
| 234 | delta = child.getBottom() - (getHeight() - mListPadding.bottom); |
| 235 | |
| 236 | if (mFirstPosition + childCount < mItemCount) { |
| 237 | // It's OK to have some space below the last item if it is |
| 238 | // part of the vertical spacing |
| 239 | delta += mDividerHeight; |
| 240 | } |
| 241 | |
| 242 | if (delta > 0) { |
| 243 | delta = 0; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | if (delta != 0) { |
| 248 | offsetChildrenTopAndBottom(-delta); |
| 249 | } |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | /** |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 254 | * Add a fixed view to appear at the top of the list. If this method is |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 255 | * called more than once, the views will appear in the order they were |
| 256 | * added. Views added using this call can take focus if they want. |
| 257 | * <p> |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 258 | * Note: When first introduced, this method could only be called before |
| 259 | * setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with |
Chet Haase | e8222dd | 2013-09-05 07:44:18 -0700 | [diff] [blame] | 260 | * {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 261 | * called at any time. If the ListView's adapter does not extend |
| 262 | * {@link HeaderViewListAdapter}, it will be wrapped with a supporting |
| 263 | * instance of {@link WrapperListAdapter}. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 264 | * |
| 265 | * @param v The view to add. |
| 266 | * @param data Data to associate with this view |
| 267 | * @param isSelectable whether the item is selectable |
| 268 | */ |
| 269 | public void addHeaderView(View v, Object data, boolean isSelectable) { |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 270 | final FixedViewInfo info = new FixedViewInfo(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 271 | info.view = v; |
| 272 | info.data = data; |
| 273 | info.isSelectable = isSelectable; |
| 274 | mHeaderViewInfos.add(info); |
Alan Viverette | 20cc605 | 2013-11-15 15:56:38 -0800 | [diff] [blame] | 275 | mAreAllItemsSelectable &= isSelectable; |
Marco Nelissen | 22c04a3 | 2011-04-19 14:07:55 -0700 | [diff] [blame] | 276 | |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 277 | // Wrap the adapter if it wasn't already wrapped. |
| 278 | if (mAdapter != null) { |
| 279 | if (!(mAdapter instanceof HeaderViewListAdapter)) { |
| 280 | mAdapter = new HeaderViewListAdapter(mHeaderViewInfos, mFooterViewInfos, mAdapter); |
| 281 | } |
| 282 | |
| 283 | // In the case of re-adding a header view, or adding one later on, |
| 284 | // we need to notify the observer. |
| 285 | if (mDataSetObserver != null) { |
| 286 | mDataSetObserver.onChanged(); |
| 287 | } |
Marco Nelissen | 22c04a3 | 2011-04-19 14:07:55 -0700 | [diff] [blame] | 288 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | /** |
| 292 | * Add a fixed view to appear at the top of the list. If addHeaderView is |
| 293 | * called more than once, the views will appear in the order they were |
| 294 | * added. Views added using this call can take focus if they want. |
| 295 | * <p> |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 296 | * Note: When first introduced, this method could only be called before |
| 297 | * setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with |
Chet Haase | e8222dd | 2013-09-05 07:44:18 -0700 | [diff] [blame] | 298 | * {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 299 | * called at any time. If the ListView's adapter does not extend |
| 300 | * {@link HeaderViewListAdapter}, it will be wrapped with a supporting |
| 301 | * instance of {@link WrapperListAdapter}. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 302 | * |
| 303 | * @param v The view to add. |
| 304 | */ |
| 305 | public void addHeaderView(View v) { |
| 306 | addHeaderView(v, null, true); |
| 307 | } |
| 308 | |
| 309 | @Override |
| 310 | public int getHeaderViewsCount() { |
| 311 | return mHeaderViewInfos.size(); |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * Removes a previously-added header view. |
| 316 | * |
| 317 | * @param v The view to remove |
| 318 | * @return true if the view was removed, false if the view was not a header |
| 319 | * view |
| 320 | */ |
| 321 | public boolean removeHeaderView(View v) { |
| 322 | if (mHeaderViewInfos.size() > 0) { |
| 323 | boolean result = false; |
Adam Powell | 247a0f0 | 2011-09-13 13:11:29 -0700 | [diff] [blame] | 324 | if (mAdapter != null && ((HeaderViewListAdapter) mAdapter).removeHeader(v)) { |
Marco Nelissen | 22c04a3 | 2011-04-19 14:07:55 -0700 | [diff] [blame] | 325 | if (mDataSetObserver != null) { |
| 326 | mDataSetObserver.onChanged(); |
| 327 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 328 | result = true; |
| 329 | } |
| 330 | removeFixedViewInfo(v, mHeaderViewInfos); |
| 331 | return result; |
| 332 | } |
| 333 | return false; |
| 334 | } |
| 335 | |
| 336 | private void removeFixedViewInfo(View v, ArrayList<FixedViewInfo> where) { |
| 337 | int len = where.size(); |
| 338 | for (int i = 0; i < len; ++i) { |
| 339 | FixedViewInfo info = where.get(i); |
| 340 | if (info.view == v) { |
| 341 | where.remove(i); |
| 342 | break; |
| 343 | } |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * Add a fixed view to appear at the bottom of the list. If addFooterView is |
| 349 | * called more than once, the views will appear in the order they were |
| 350 | * added. Views added using this call can take focus if they want. |
| 351 | * <p> |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 352 | * Note: When first introduced, this method could only be called before |
| 353 | * setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with |
Chet Haase | e8222dd | 2013-09-05 07:44:18 -0700 | [diff] [blame] | 354 | * {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 355 | * called at any time. If the ListView's adapter does not extend |
| 356 | * {@link HeaderViewListAdapter}, it will be wrapped with a supporting |
| 357 | * instance of {@link WrapperListAdapter}. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 358 | * |
| 359 | * @param v The view to add. |
| 360 | * @param data Data to associate with this view |
| 361 | * @param isSelectable true if the footer view can be selected |
| 362 | */ |
| 363 | public void addFooterView(View v, Object data, boolean isSelectable) { |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 364 | final FixedViewInfo info = new FixedViewInfo(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 365 | info.view = v; |
| 366 | info.data = data; |
| 367 | info.isSelectable = isSelectable; |
| 368 | mFooterViewInfos.add(info); |
Alan Viverette | 20cc605 | 2013-11-15 15:56:38 -0800 | [diff] [blame] | 369 | mAreAllItemsSelectable &= isSelectable; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 370 | |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 371 | // Wrap the adapter if it wasn't already wrapped. |
| 372 | if (mAdapter != null) { |
| 373 | if (!(mAdapter instanceof HeaderViewListAdapter)) { |
| 374 | mAdapter = new HeaderViewListAdapter(mHeaderViewInfos, mFooterViewInfos, mAdapter); |
| 375 | } |
| 376 | |
| 377 | // In the case of re-adding a footer view, or adding one later on, |
| 378 | // we need to notify the observer. |
| 379 | if (mDataSetObserver != null) { |
| 380 | mDataSetObserver.onChanged(); |
| 381 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 382 | } |
| 383 | } |
| 384 | |
| 385 | /** |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 386 | * Add a fixed view to appear at the bottom of the list. If addFooterView is |
| 387 | * called more than once, the views will appear in the order they were |
| 388 | * added. Views added using this call can take focus if they want. |
| 389 | * <p> |
| 390 | * Note: When first introduced, this method could only be called before |
| 391 | * setting the adapter with {@link #setAdapter(ListAdapter)}. Starting with |
Chet Haase | e8222dd | 2013-09-05 07:44:18 -0700 | [diff] [blame] | 392 | * {@link android.os.Build.VERSION_CODES#KITKAT}, this method may be |
Alan Viverette | 72e2f2a | 2013-06-12 12:56:29 -0700 | [diff] [blame] | 393 | * called at any time. If the ListView's adapter does not extend |
| 394 | * {@link HeaderViewListAdapter}, it will be wrapped with a supporting |
| 395 | * instance of {@link WrapperListAdapter}. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 396 | * |
| 397 | * @param v The view to add. |
| 398 | */ |
| 399 | public void addFooterView(View v) { |
| 400 | addFooterView(v, null, true); |
| 401 | } |
| 402 | |
| 403 | @Override |
| 404 | public int getFooterViewsCount() { |
| 405 | return mFooterViewInfos.size(); |
| 406 | } |
| 407 | |
| 408 | /** |
| 409 | * Removes a previously-added footer view. |
| 410 | * |
| 411 | * @param v The view to remove |
| 412 | * @return |
| 413 | * true if the view was removed, false if the view was not a footer view |
| 414 | */ |
| 415 | public boolean removeFooterView(View v) { |
| 416 | if (mFooterViewInfos.size() > 0) { |
| 417 | boolean result = false; |
Adam Powell | 247a0f0 | 2011-09-13 13:11:29 -0700 | [diff] [blame] | 418 | if (mAdapter != null && ((HeaderViewListAdapter) mAdapter).removeFooter(v)) { |
Marco Nelissen | 22c04a3 | 2011-04-19 14:07:55 -0700 | [diff] [blame] | 419 | if (mDataSetObserver != null) { |
| 420 | mDataSetObserver.onChanged(); |
| 421 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 422 | result = true; |
| 423 | } |
| 424 | removeFixedViewInfo(v, mFooterViewInfos); |
| 425 | return result; |
| 426 | } |
| 427 | return false; |
| 428 | } |
| 429 | |
| 430 | /** |
| 431 | * Returns the adapter currently in use in this ListView. The returned adapter |
| 432 | * might not be the same adapter passed to {@link #setAdapter(ListAdapter)} but |
| 433 | * might be a {@link WrapperListAdapter}. |
| 434 | * |
| 435 | * @return The adapter currently used to display data in this ListView. |
| 436 | * |
| 437 | * @see #setAdapter(ListAdapter) |
| 438 | */ |
| 439 | @Override |
| 440 | public ListAdapter getAdapter() { |
| 441 | return mAdapter; |
| 442 | } |
| 443 | |
| 444 | /** |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 445 | * Sets up this AbsListView to use a remote views adapter which connects to a RemoteViewsService |
| 446 | * through the specified intent. |
| 447 | * @param intent the intent used to identify the RemoteViewsService for the adapter to connect to. |
| 448 | */ |
| 449 | @android.view.RemotableViewMethod |
| 450 | public void setRemoteViewsAdapter(Intent intent) { |
| 451 | super.setRemoteViewsAdapter(intent); |
| 452 | } |
| 453 | |
| 454 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 455 | * Sets the data behind this ListView. |
| 456 | * |
| 457 | * The adapter passed to this method may be wrapped by a {@link WrapperListAdapter}, |
| 458 | * depending on the ListView features currently in use. For instance, adding |
| 459 | * headers and/or footers will cause the adapter to be wrapped. |
| 460 | * |
| 461 | * @param adapter The ListAdapter which is responsible for maintaining the |
| 462 | * data backing this list and for producing a view to represent an |
| 463 | * item in that data set. |
| 464 | * |
| 465 | * @see #getAdapter() |
| 466 | */ |
| 467 | @Override |
| 468 | public void setAdapter(ListAdapter adapter) { |
Romain Guy | df36b05 | 2010-05-19 21:13:20 -0700 | [diff] [blame] | 469 | if (mAdapter != null && mDataSetObserver != null) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 470 | mAdapter.unregisterDataSetObserver(mDataSetObserver); |
| 471 | } |
| 472 | |
| 473 | resetList(); |
| 474 | mRecycler.clear(); |
| 475 | |
| 476 | if (mHeaderViewInfos.size() > 0|| mFooterViewInfos.size() > 0) { |
| 477 | mAdapter = new HeaderViewListAdapter(mHeaderViewInfos, mFooterViewInfos, adapter); |
| 478 | } else { |
| 479 | mAdapter = adapter; |
| 480 | } |
| 481 | |
| 482 | mOldSelectedPosition = INVALID_POSITION; |
| 483 | mOldSelectedRowId = INVALID_ROW_ID; |
Adam Powell | f343e1b | 2010-08-13 18:27:04 -0700 | [diff] [blame] | 484 | |
| 485 | // AbsListView#setAdapter will update choice mode states. |
| 486 | super.setAdapter(adapter); |
| 487 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 488 | if (mAdapter != null) { |
| 489 | mAreAllItemsSelectable = mAdapter.areAllItemsEnabled(); |
| 490 | mOldItemCount = mItemCount; |
| 491 | mItemCount = mAdapter.getCount(); |
| 492 | checkFocus(); |
| 493 | |
| 494 | mDataSetObserver = new AdapterDataSetObserver(); |
| 495 | mAdapter.registerDataSetObserver(mDataSetObserver); |
| 496 | |
| 497 | mRecycler.setViewTypeCount(mAdapter.getViewTypeCount()); |
| 498 | |
| 499 | int position; |
| 500 | if (mStackFromBottom) { |
| 501 | position = lookForSelectablePosition(mItemCount - 1, false); |
| 502 | } else { |
| 503 | position = lookForSelectablePosition(0, true); |
| 504 | } |
| 505 | setSelectedPositionInt(position); |
| 506 | setNextSelectedPositionInt(position); |
| 507 | |
| 508 | if (mItemCount == 0) { |
| 509 | // Nothing selected |
| 510 | checkSelectionChanged(); |
| 511 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 512 | } else { |
| 513 | mAreAllItemsSelectable = true; |
| 514 | checkFocus(); |
| 515 | // Nothing selected |
| 516 | checkSelectionChanged(); |
| 517 | } |
| 518 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 519 | requestLayout(); |
| 520 | } |
| 521 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 522 | /** |
| 523 | * The list is empty. Clear everything out. |
| 524 | */ |
| 525 | @Override |
| 526 | void resetList() { |
Romain Guy | 2e447d4 | 2009-04-28 18:01:24 -0700 | [diff] [blame] | 527 | // The parent's resetList() will remove all views from the layout so we need to |
| 528 | // cleanup the state of our footers and headers |
| 529 | clearRecycledState(mHeaderViewInfos); |
| 530 | clearRecycledState(mFooterViewInfos); |
| 531 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 532 | super.resetList(); |
Romain Guy | 2e447d4 | 2009-04-28 18:01:24 -0700 | [diff] [blame] | 533 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 534 | mLayoutMode = LAYOUT_NORMAL; |
| 535 | } |
| 536 | |
Romain Guy | 2e447d4 | 2009-04-28 18:01:24 -0700 | [diff] [blame] | 537 | private void clearRecycledState(ArrayList<FixedViewInfo> infos) { |
| 538 | if (infos != null) { |
| 539 | final int count = infos.size(); |
| 540 | |
| 541 | for (int i = 0; i < count; i++) { |
| 542 | final View child = infos.get(i).view; |
| 543 | final LayoutParams p = (LayoutParams) child.getLayoutParams(); |
| 544 | if (p != null) { |
| 545 | p.recycledHeaderFooter = false; |
| 546 | } |
| 547 | } |
| 548 | } |
| 549 | } |
| 550 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 551 | /** |
| 552 | * @return Whether the list needs to show the top fading edge |
| 553 | */ |
| 554 | private boolean showingTopFadingEdge() { |
| 555 | final int listTop = mScrollY + mListPadding.top; |
| 556 | return (mFirstPosition > 0) || (getChildAt(0).getTop() > listTop); |
| 557 | } |
| 558 | |
| 559 | /** |
| 560 | * @return Whether the list needs to show the bottom fading edge |
| 561 | */ |
| 562 | private boolean showingBottomFadingEdge() { |
| 563 | final int childCount = getChildCount(); |
| 564 | final int bottomOfBottomChild = getChildAt(childCount - 1).getBottom(); |
| 565 | final int lastVisiblePosition = mFirstPosition + childCount - 1; |
| 566 | |
| 567 | final int listBottom = mScrollY + getHeight() - mListPadding.bottom; |
| 568 | |
| 569 | return (lastVisiblePosition < mItemCount - 1) |
| 570 | || (bottomOfBottomChild < listBottom); |
| 571 | } |
| 572 | |
| 573 | |
| 574 | @Override |
| 575 | public boolean requestChildRectangleOnScreen(View child, Rect rect, boolean immediate) { |
| 576 | |
| 577 | int rectTopWithinChild = rect.top; |
| 578 | |
| 579 | // offset so rect is in coordinates of the this view |
| 580 | rect.offset(child.getLeft(), child.getTop()); |
| 581 | rect.offset(-child.getScrollX(), -child.getScrollY()); |
| 582 | |
| 583 | final int height = getHeight(); |
| 584 | int listUnfadedTop = getScrollY(); |
| 585 | int listUnfadedBottom = listUnfadedTop + height; |
| 586 | final int fadingEdge = getVerticalFadingEdgeLength(); |
| 587 | |
| 588 | if (showingTopFadingEdge()) { |
| 589 | // leave room for top fading edge as long as rect isn't at very top |
| 590 | if ((mSelectedPosition > 0) || (rectTopWithinChild > fadingEdge)) { |
| 591 | listUnfadedTop += fadingEdge; |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | int childCount = getChildCount(); |
| 596 | int bottomOfBottomChild = getChildAt(childCount - 1).getBottom(); |
| 597 | |
| 598 | if (showingBottomFadingEdge()) { |
| 599 | // leave room for bottom fading edge as long as rect isn't at very bottom |
| 600 | if ((mSelectedPosition < mItemCount - 1) |
| 601 | || (rect.bottom < (bottomOfBottomChild - fadingEdge))) { |
| 602 | listUnfadedBottom -= fadingEdge; |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | int scrollYDelta = 0; |
| 607 | |
| 608 | if (rect.bottom > listUnfadedBottom && rect.top > listUnfadedTop) { |
| 609 | // need to MOVE DOWN to get it in view: move down just enough so |
| 610 | // that the entire rectangle is in view (or at least the first |
| 611 | // screen size chunk). |
| 612 | |
| 613 | if (rect.height() > height) { |
| 614 | // just enough to get screen size chunk on |
| 615 | scrollYDelta += (rect.top - listUnfadedTop); |
| 616 | } else { |
| 617 | // get entire rect at bottom of screen |
| 618 | scrollYDelta += (rect.bottom - listUnfadedBottom); |
| 619 | } |
| 620 | |
| 621 | // make sure we aren't scrolling beyond the end of our children |
| 622 | int distanceToBottom = bottomOfBottomChild - listUnfadedBottom; |
| 623 | scrollYDelta = Math.min(scrollYDelta, distanceToBottom); |
| 624 | } else if (rect.top < listUnfadedTop && rect.bottom < listUnfadedBottom) { |
| 625 | // need to MOVE UP to get it in view: move up just enough so that |
| 626 | // entire rectangle is in view (or at least the first screen |
| 627 | // size chunk of it). |
| 628 | |
| 629 | if (rect.height() > height) { |
| 630 | // screen size chunk |
| 631 | scrollYDelta -= (listUnfadedBottom - rect.bottom); |
| 632 | } else { |
| 633 | // entire rect at top |
| 634 | scrollYDelta -= (listUnfadedTop - rect.top); |
| 635 | } |
| 636 | |
| 637 | // make sure we aren't scrolling any further than the top our children |
| 638 | int top = getChildAt(0).getTop(); |
| 639 | int deltaToTop = top - listUnfadedTop; |
| 640 | scrollYDelta = Math.max(scrollYDelta, deltaToTop); |
| 641 | } |
| 642 | |
| 643 | final boolean scroll = scrollYDelta != 0; |
| 644 | if (scroll) { |
| 645 | scrollListItemsBy(-scrollYDelta); |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 646 | positionSelector(INVALID_POSITION, child); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 647 | mSelectedTop = child.getTop(); |
| 648 | invalidate(); |
| 649 | } |
| 650 | return scroll; |
| 651 | } |
| 652 | |
| 653 | /** |
| 654 | * {@inheritDoc} |
| 655 | */ |
| 656 | @Override |
| 657 | void fillGap(boolean down) { |
| 658 | final int count = getChildCount(); |
| 659 | if (down) { |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 660 | int paddingTop = 0; |
| 661 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 662 | paddingTop = getListPaddingTop(); |
| 663 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 664 | final int startOffset = count > 0 ? getChildAt(count - 1).getBottom() + mDividerHeight : |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 665 | paddingTop; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 666 | fillDown(mFirstPosition + count, startOffset); |
| 667 | correctTooHigh(getChildCount()); |
| 668 | } else { |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 669 | int paddingBottom = 0; |
| 670 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 671 | paddingBottom = getListPaddingBottom(); |
| 672 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 673 | final int startOffset = count > 0 ? getChildAt(0).getTop() - mDividerHeight : |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 674 | getHeight() - paddingBottom; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 675 | fillUp(mFirstPosition - 1, startOffset); |
| 676 | correctTooLow(getChildCount()); |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | /** |
| 681 | * Fills the list from pos down to the end of the list view. |
| 682 | * |
| 683 | * @param pos The first position to put in the list |
| 684 | * |
| 685 | * @param nextTop The location where the top of the item associated with pos |
| 686 | * should be drawn |
| 687 | * |
| 688 | * @return The view that is currently selected, if it happens to be in the |
| 689 | * range that we draw. |
| 690 | */ |
| 691 | private View fillDown(int pos, int nextTop) { |
| 692 | View selectedView = null; |
| 693 | |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 694 | int end = (mBottom - mTop); |
| 695 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 696 | end -= mListPadding.bottom; |
| 697 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 698 | |
| 699 | while (nextTop < end && pos < mItemCount) { |
| 700 | // is this the selected item? |
| 701 | boolean selected = pos == mSelectedPosition; |
| 702 | View child = makeAndAddView(pos, nextTop, true, mListPadding.left, selected); |
| 703 | |
| 704 | nextTop = child.getBottom() + mDividerHeight; |
| 705 | if (selected) { |
| 706 | selectedView = child; |
| 707 | } |
| 708 | pos++; |
| 709 | } |
| 710 | |
Adam Cohen | b967392 | 2012-01-05 13:58:47 -0800 | [diff] [blame] | 711 | setVisibleRangeHint(mFirstPosition, mFirstPosition + getChildCount() - 1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 712 | return selectedView; |
| 713 | } |
| 714 | |
| 715 | /** |
| 716 | * Fills the list from pos up to the top of the list view. |
| 717 | * |
| 718 | * @param pos The first position to put in the list |
| 719 | * |
| 720 | * @param nextBottom The location where the bottom of the item associated |
| 721 | * with pos should be drawn |
| 722 | * |
| 723 | * @return The view that is currently selected |
| 724 | */ |
| 725 | private View fillUp(int pos, int nextBottom) { |
| 726 | View selectedView = null; |
| 727 | |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 728 | int end = 0; |
| 729 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 730 | end = mListPadding.top; |
| 731 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 732 | |
| 733 | while (nextBottom > end && pos >= 0) { |
| 734 | // is this the selected item? |
| 735 | boolean selected = pos == mSelectedPosition; |
| 736 | View child = makeAndAddView(pos, nextBottom, false, mListPadding.left, selected); |
| 737 | nextBottom = child.getTop() - mDividerHeight; |
| 738 | if (selected) { |
| 739 | selectedView = child; |
| 740 | } |
| 741 | pos--; |
| 742 | } |
| 743 | |
| 744 | mFirstPosition = pos + 1; |
Adam Cohen | b967392 | 2012-01-05 13:58:47 -0800 | [diff] [blame] | 745 | setVisibleRangeHint(mFirstPosition, mFirstPosition + getChildCount() - 1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 746 | return selectedView; |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * Fills the list from top to bottom, starting with mFirstPosition |
| 751 | * |
| 752 | * @param nextTop The location where the top of the first item should be |
| 753 | * drawn |
| 754 | * |
| 755 | * @return The view that is currently selected |
| 756 | */ |
| 757 | private View fillFromTop(int nextTop) { |
| 758 | mFirstPosition = Math.min(mFirstPosition, mSelectedPosition); |
| 759 | mFirstPosition = Math.min(mFirstPosition, mItemCount - 1); |
| 760 | if (mFirstPosition < 0) { |
| 761 | mFirstPosition = 0; |
| 762 | } |
| 763 | return fillDown(mFirstPosition, nextTop); |
| 764 | } |
| 765 | |
| 766 | |
| 767 | /** |
| 768 | * Put mSelectedPosition in the middle of the screen and then build up and |
| 769 | * down from there. This method forces mSelectedPosition to the center. |
| 770 | * |
| 771 | * @param childrenTop Top of the area in which children can be drawn, as |
| 772 | * measured in pixels |
| 773 | * @param childrenBottom Bottom of the area in which children can be drawn, |
| 774 | * as measured in pixels |
| 775 | * @return Currently selected view |
| 776 | */ |
| 777 | private View fillFromMiddle(int childrenTop, int childrenBottom) { |
| 778 | int height = childrenBottom - childrenTop; |
| 779 | |
| 780 | int position = reconcileSelectedPosition(); |
| 781 | |
| 782 | View sel = makeAndAddView(position, childrenTop, true, |
| 783 | mListPadding.left, true); |
| 784 | mFirstPosition = position; |
| 785 | |
| 786 | int selHeight = sel.getMeasuredHeight(); |
| 787 | if (selHeight <= height) { |
| 788 | sel.offsetTopAndBottom((height - selHeight) / 2); |
| 789 | } |
| 790 | |
| 791 | fillAboveAndBelow(sel, position); |
| 792 | |
| 793 | if (!mStackFromBottom) { |
| 794 | correctTooHigh(getChildCount()); |
| 795 | } else { |
| 796 | correctTooLow(getChildCount()); |
| 797 | } |
| 798 | |
| 799 | return sel; |
| 800 | } |
| 801 | |
| 802 | /** |
| 803 | * Once the selected view as been placed, fill up the visible area above and |
| 804 | * below it. |
| 805 | * |
| 806 | * @param sel The selected view |
| 807 | * @param position The position corresponding to sel |
| 808 | */ |
| 809 | private void fillAboveAndBelow(View sel, int position) { |
| 810 | final int dividerHeight = mDividerHeight; |
| 811 | if (!mStackFromBottom) { |
| 812 | fillUp(position - 1, sel.getTop() - dividerHeight); |
| 813 | adjustViewsUpOrDown(); |
| 814 | fillDown(position + 1, sel.getBottom() + dividerHeight); |
| 815 | } else { |
| 816 | fillDown(position + 1, sel.getBottom() + dividerHeight); |
| 817 | adjustViewsUpOrDown(); |
| 818 | fillUp(position - 1, sel.getTop() - dividerHeight); |
| 819 | } |
| 820 | } |
| 821 | |
| 822 | |
| 823 | /** |
| 824 | * Fills the grid based on positioning the new selection at a specific |
| 825 | * location. The selection may be moved so that it does not intersect the |
| 826 | * faded edges. The grid is then filled upwards and downwards from there. |
| 827 | * |
| 828 | * @param selectedTop Where the selected item should be |
| 829 | * @param childrenTop Where to start drawing children |
| 830 | * @param childrenBottom Last pixel where children can be drawn |
| 831 | * @return The view that currently has selection |
| 832 | */ |
| 833 | private View fillFromSelection(int selectedTop, int childrenTop, int childrenBottom) { |
| 834 | int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 835 | final int selectedPosition = mSelectedPosition; |
| 836 | |
| 837 | View sel; |
| 838 | |
| 839 | final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, |
| 840 | selectedPosition); |
| 841 | final int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, fadingEdgeLength, |
| 842 | selectedPosition); |
| 843 | |
| 844 | sel = makeAndAddView(selectedPosition, selectedTop, true, mListPadding.left, true); |
| 845 | |
| 846 | |
| 847 | // Some of the newly selected item extends below the bottom of the list |
| 848 | if (sel.getBottom() > bottomSelectionPixel) { |
| 849 | // Find space available above the selection into which we can scroll |
| 850 | // upwards |
| 851 | final int spaceAbove = sel.getTop() - topSelectionPixel; |
| 852 | |
| 853 | // Find space required to bring the bottom of the selected item |
| 854 | // fully into view |
| 855 | final int spaceBelow = sel.getBottom() - bottomSelectionPixel; |
| 856 | final int offset = Math.min(spaceAbove, spaceBelow); |
| 857 | |
| 858 | // Now offset the selected item to get it into view |
| 859 | sel.offsetTopAndBottom(-offset); |
| 860 | } else if (sel.getTop() < topSelectionPixel) { |
| 861 | // Find space required to bring the top of the selected item fully |
| 862 | // into view |
| 863 | final int spaceAbove = topSelectionPixel - sel.getTop(); |
| 864 | |
| 865 | // Find space available below the selection into which we can scroll |
| 866 | // downwards |
| 867 | final int spaceBelow = bottomSelectionPixel - sel.getBottom(); |
| 868 | final int offset = Math.min(spaceAbove, spaceBelow); |
| 869 | |
| 870 | // Offset the selected item to get it into view |
| 871 | sel.offsetTopAndBottom(offset); |
| 872 | } |
| 873 | |
| 874 | // Fill in views above and below |
| 875 | fillAboveAndBelow(sel, selectedPosition); |
| 876 | |
| 877 | if (!mStackFromBottom) { |
| 878 | correctTooHigh(getChildCount()); |
| 879 | } else { |
| 880 | correctTooLow(getChildCount()); |
| 881 | } |
| 882 | |
| 883 | return sel; |
| 884 | } |
| 885 | |
| 886 | /** |
| 887 | * Calculate the bottom-most pixel we can draw the selection into |
| 888 | * |
| 889 | * @param childrenBottom Bottom pixel were children can be drawn |
| 890 | * @param fadingEdgeLength Length of the fading edge in pixels, if present |
| 891 | * @param selectedPosition The position that will be selected |
| 892 | * @return The bottom-most pixel we can draw the selection into |
| 893 | */ |
| 894 | private int getBottomSelectionPixel(int childrenBottom, int fadingEdgeLength, |
| 895 | int selectedPosition) { |
| 896 | int bottomSelectionPixel = childrenBottom; |
| 897 | if (selectedPosition != mItemCount - 1) { |
| 898 | bottomSelectionPixel -= fadingEdgeLength; |
| 899 | } |
| 900 | return bottomSelectionPixel; |
| 901 | } |
| 902 | |
| 903 | /** |
| 904 | * Calculate the top-most pixel we can draw the selection into |
| 905 | * |
| 906 | * @param childrenTop Top pixel were children can be drawn |
| 907 | * @param fadingEdgeLength Length of the fading edge in pixels, if present |
| 908 | * @param selectedPosition The position that will be selected |
| 909 | * @return The top-most pixel we can draw the selection into |
| 910 | */ |
| 911 | private int getTopSelectionPixel(int childrenTop, int fadingEdgeLength, int selectedPosition) { |
| 912 | // first pixel we can draw the selection into |
| 913 | int topSelectionPixel = childrenTop; |
| 914 | if (selectedPosition > 0) { |
| 915 | topSelectionPixel += fadingEdgeLength; |
| 916 | } |
| 917 | return topSelectionPixel; |
| 918 | } |
| 919 | |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 920 | /** |
| 921 | * Smoothly scroll to the specified adapter position. The view will |
| 922 | * scroll such that the indicated position is displayed. |
| 923 | * @param position Scroll to this adapter position. |
| 924 | */ |
| 925 | @android.view.RemotableViewMethod |
| 926 | public void smoothScrollToPosition(int position) { |
| 927 | super.smoothScrollToPosition(position); |
| 928 | } |
| 929 | |
| 930 | /** |
| 931 | * Smoothly scroll to the specified adapter position offset. The view will |
| 932 | * scroll such that the indicated position is displayed. |
| 933 | * @param offset The amount to offset from the adapter position to scroll to. |
| 934 | */ |
| 935 | @android.view.RemotableViewMethod |
| 936 | public void smoothScrollByOffset(int offset) { |
| 937 | super.smoothScrollByOffset(offset); |
| 938 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 939 | |
| 940 | /** |
| 941 | * Fills the list based on positioning the new selection relative to the old |
| 942 | * selection. The new selection will be placed at, above, or below the |
| 943 | * location of the new selection depending on how the selection is moving. |
| 944 | * The selection will then be pinned to the visible part of the screen, |
| 945 | * excluding the edges that are faded. The list is then filled upwards and |
| 946 | * downwards from there. |
| 947 | * |
| 948 | * @param oldSel The old selected view. Useful for trying to put the new |
| 949 | * selection in the same place |
| 950 | * @param newSel The view that is to become selected. Useful for trying to |
| 951 | * put the new selection in the same place |
| 952 | * @param delta Which way we are moving |
| 953 | * @param childrenTop Where to start drawing children |
| 954 | * @param childrenBottom Last pixel where children can be drawn |
| 955 | * @return The view that currently has selection |
| 956 | */ |
| 957 | private View moveSelection(View oldSel, View newSel, int delta, int childrenTop, |
| 958 | int childrenBottom) { |
| 959 | int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 960 | final int selectedPosition = mSelectedPosition; |
| 961 | |
| 962 | View sel; |
| 963 | |
| 964 | final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, |
| 965 | selectedPosition); |
| 966 | final int bottomSelectionPixel = getBottomSelectionPixel(childrenTop, fadingEdgeLength, |
| 967 | selectedPosition); |
| 968 | |
| 969 | if (delta > 0) { |
| 970 | /* |
| 971 | * Case 1: Scrolling down. |
| 972 | */ |
| 973 | |
| 974 | /* |
| 975 | * Before After |
| 976 | * | | | | |
| 977 | * +-------+ +-------+ |
| 978 | * | A | | A | |
| 979 | * | 1 | => +-------+ |
| 980 | * +-------+ | B | |
| 981 | * | B | | 2 | |
| 982 | * +-------+ +-------+ |
| 983 | * | | | | |
| 984 | * |
| 985 | * Try to keep the top of the previously selected item where it was. |
| 986 | * oldSel = A |
| 987 | * sel = B |
| 988 | */ |
| 989 | |
| 990 | // Put oldSel (A) where it belongs |
| 991 | oldSel = makeAndAddView(selectedPosition - 1, oldSel.getTop(), true, |
| 992 | mListPadding.left, false); |
| 993 | |
| 994 | final int dividerHeight = mDividerHeight; |
| 995 | |
| 996 | // Now put the new selection (B) below that |
| 997 | sel = makeAndAddView(selectedPosition, oldSel.getBottom() + dividerHeight, true, |
| 998 | mListPadding.left, true); |
| 999 | |
| 1000 | // Some of the newly selected item extends below the bottom of the list |
| 1001 | if (sel.getBottom() > bottomSelectionPixel) { |
| 1002 | |
| 1003 | // Find space available above the selection into which we can scroll upwards |
| 1004 | int spaceAbove = sel.getTop() - topSelectionPixel; |
| 1005 | |
| 1006 | // Find space required to bring the bottom of the selected item fully into view |
| 1007 | int spaceBelow = sel.getBottom() - bottomSelectionPixel; |
| 1008 | |
| 1009 | // Don't scroll more than half the height of the list |
| 1010 | int halfVerticalSpace = (childrenBottom - childrenTop) / 2; |
| 1011 | int offset = Math.min(spaceAbove, spaceBelow); |
| 1012 | offset = Math.min(offset, halfVerticalSpace); |
| 1013 | |
| 1014 | // We placed oldSel, so offset that item |
| 1015 | oldSel.offsetTopAndBottom(-offset); |
| 1016 | // Now offset the selected item to get it into view |
| 1017 | sel.offsetTopAndBottom(-offset); |
| 1018 | } |
| 1019 | |
| 1020 | // Fill in views above and below |
| 1021 | if (!mStackFromBottom) { |
| 1022 | fillUp(mSelectedPosition - 2, sel.getTop() - dividerHeight); |
| 1023 | adjustViewsUpOrDown(); |
| 1024 | fillDown(mSelectedPosition + 1, sel.getBottom() + dividerHeight); |
| 1025 | } else { |
| 1026 | fillDown(mSelectedPosition + 1, sel.getBottom() + dividerHeight); |
| 1027 | adjustViewsUpOrDown(); |
| 1028 | fillUp(mSelectedPosition - 2, sel.getTop() - dividerHeight); |
| 1029 | } |
| 1030 | } else if (delta < 0) { |
| 1031 | /* |
| 1032 | * Case 2: Scrolling up. |
| 1033 | */ |
| 1034 | |
| 1035 | /* |
| 1036 | * Before After |
| 1037 | * | | | | |
| 1038 | * +-------+ +-------+ |
| 1039 | * | A | | A | |
| 1040 | * +-------+ => | 1 | |
| 1041 | * | B | +-------+ |
| 1042 | * | 2 | | B | |
| 1043 | * +-------+ +-------+ |
| 1044 | * | | | | |
| 1045 | * |
| 1046 | * Try to keep the top of the item about to become selected where it was. |
| 1047 | * newSel = A |
| 1048 | * olSel = B |
| 1049 | */ |
| 1050 | |
| 1051 | if (newSel != null) { |
| 1052 | // Try to position the top of newSel (A) where it was before it was selected |
| 1053 | sel = makeAndAddView(selectedPosition, newSel.getTop(), true, mListPadding.left, |
| 1054 | true); |
| 1055 | } else { |
| 1056 | // If (A) was not on screen and so did not have a view, position |
| 1057 | // it above the oldSel (B) |
| 1058 | sel = makeAndAddView(selectedPosition, oldSel.getTop(), false, mListPadding.left, |
| 1059 | true); |
| 1060 | } |
| 1061 | |
| 1062 | // Some of the newly selected item extends above the top of the list |
| 1063 | if (sel.getTop() < topSelectionPixel) { |
| 1064 | // Find space required to bring the top of the selected item fully into view |
| 1065 | int spaceAbove = topSelectionPixel - sel.getTop(); |
| 1066 | |
| 1067 | // Find space available below the selection into which we can scroll downwards |
| 1068 | int spaceBelow = bottomSelectionPixel - sel.getBottom(); |
| 1069 | |
| 1070 | // Don't scroll more than half the height of the list |
| 1071 | int halfVerticalSpace = (childrenBottom - childrenTop) / 2; |
| 1072 | int offset = Math.min(spaceAbove, spaceBelow); |
| 1073 | offset = Math.min(offset, halfVerticalSpace); |
| 1074 | |
| 1075 | // Offset the selected item to get it into view |
| 1076 | sel.offsetTopAndBottom(offset); |
| 1077 | } |
| 1078 | |
| 1079 | // Fill in views above and below |
| 1080 | fillAboveAndBelow(sel, selectedPosition); |
| 1081 | } else { |
| 1082 | |
| 1083 | int oldTop = oldSel.getTop(); |
| 1084 | |
| 1085 | /* |
| 1086 | * Case 3: Staying still |
| 1087 | */ |
| 1088 | sel = makeAndAddView(selectedPosition, oldTop, true, mListPadding.left, true); |
| 1089 | |
| 1090 | // We're staying still... |
| 1091 | if (oldTop < childrenTop) { |
| 1092 | // ... but the top of the old selection was off screen. |
| 1093 | // (This can happen if the data changes size out from under us) |
| 1094 | int newBottom = sel.getBottom(); |
| 1095 | if (newBottom < childrenTop + 20) { |
| 1096 | // Not enough visible -- bring it onscreen |
| 1097 | sel.offsetTopAndBottom(childrenTop - sel.getTop()); |
| 1098 | } |
| 1099 | } |
| 1100 | |
| 1101 | // Fill in views above and below |
| 1102 | fillAboveAndBelow(sel, selectedPosition); |
| 1103 | } |
| 1104 | |
| 1105 | return sel; |
| 1106 | } |
| 1107 | |
Adam Powell | 9bf3c12 | 2010-02-26 11:32:07 -0800 | [diff] [blame] | 1108 | private class FocusSelector implements Runnable { |
| 1109 | private int mPosition; |
| 1110 | private int mPositionTop; |
| 1111 | |
| 1112 | public FocusSelector setup(int position, int top) { |
| 1113 | mPosition = position; |
| 1114 | mPositionTop = top; |
| 1115 | return this; |
| 1116 | } |
| 1117 | |
| 1118 | public void run() { |
| 1119 | setSelectionFromTop(mPosition, mPositionTop); |
| 1120 | } |
| 1121 | } |
| 1122 | |
| 1123 | @Override |
| 1124 | protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| 1125 | if (getChildCount() > 0) { |
| 1126 | View focusedChild = getFocusedChild(); |
| 1127 | if (focusedChild != null) { |
| 1128 | final int childPosition = mFirstPosition + indexOfChild(focusedChild); |
| 1129 | final int childBottom = focusedChild.getBottom(); |
| 1130 | final int offset = Math.max(0, childBottom - (h - mPaddingTop)); |
| 1131 | final int top = focusedChild.getTop() - offset; |
| 1132 | if (mFocusSelector == null) { |
| 1133 | mFocusSelector = new FocusSelector(); |
| 1134 | } |
| 1135 | post(mFocusSelector.setup(childPosition, top)); |
| 1136 | } |
| 1137 | } |
| 1138 | super.onSizeChanged(w, h, oldw, oldh); |
| 1139 | } |
| 1140 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1141 | @Override |
| 1142 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 1143 | // Sets up mListPadding |
| 1144 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| 1145 | |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1146 | final int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| 1147 | final int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1148 | int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
| 1149 | int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| 1150 | |
| 1151 | int childWidth = 0; |
| 1152 | int childHeight = 0; |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1153 | int childState = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1154 | |
| 1155 | mItemCount = mAdapter == null ? 0 : mAdapter.getCount(); |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1156 | if (mItemCount > 0 && (widthMode == MeasureSpec.UNSPECIFIED |
| 1157 | || heightMode == MeasureSpec.UNSPECIFIED)) { |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1158 | final View child = obtainView(0, mIsScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1159 | |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1160 | // Lay out child directly against the parent measure spec so that |
Chet Haase | 4610eef | 2015-12-03 07:38:11 -0800 | [diff] [blame^] | 1161 | // we can obtain exected minimum width and height. |
Filip Gruszczynski | b6824bf | 2015-04-13 09:16:25 -0700 | [diff] [blame] | 1162 | measureScrapChild(child, 0, widthMeasureSpec, heightSize); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1163 | |
| 1164 | childWidth = child.getMeasuredWidth(); |
| 1165 | childHeight = child.getMeasuredHeight(); |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1166 | childState = combineMeasuredStates(childState, child.getMeasuredState()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1167 | |
Romain Guy | 9c3184cc | 2010-02-25 17:32:54 -0800 | [diff] [blame] | 1168 | if (recycleOnMeasure() && mRecycler.shouldRecycleViewType( |
| 1169 | ((LayoutParams) child.getLayoutParams()).viewType)) { |
Alan Viverette | 4771b55 | 2014-08-15 18:02:23 -0700 | [diff] [blame] | 1170 | mRecycler.addScrapView(child, 0); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1171 | } |
| 1172 | } |
| 1173 | |
| 1174 | if (widthMode == MeasureSpec.UNSPECIFIED) { |
| 1175 | widthSize = mListPadding.left + mListPadding.right + childWidth + |
| 1176 | getVerticalScrollbarWidth(); |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1177 | } else { |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1178 | widthSize |= (childState & MEASURED_STATE_MASK); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1179 | } |
| 1180 | |
| 1181 | if (heightMode == MeasureSpec.UNSPECIFIED) { |
| 1182 | heightSize = mListPadding.top + mListPadding.bottom + childHeight + |
| 1183 | getVerticalFadingEdgeLength() * 2; |
| 1184 | } |
| 1185 | |
| 1186 | if (heightMode == MeasureSpec.AT_MOST) { |
| 1187 | // TODO: after first layout we should maybe start at the first visible position, not 0 |
| 1188 | heightSize = measureHeightOfChildren(widthMeasureSpec, 0, NO_POSITION, heightSize, -1); |
| 1189 | } |
| 1190 | |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1191 | setMeasuredDimension(widthSize, heightSize); |
| 1192 | |
| 1193 | mWidthMeasureSpec = widthMeasureSpec; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1194 | } |
| 1195 | |
Filip Gruszczynski | b6824bf | 2015-04-13 09:16:25 -0700 | [diff] [blame] | 1196 | private void measureScrapChild(View child, int position, int widthMeasureSpec, int heightHint) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1197 | LayoutParams p = (LayoutParams) child.getLayoutParams(); |
| 1198 | if (p == null) { |
Adam Powell | aebd28f | 2012-02-22 10:31:16 -0800 | [diff] [blame] | 1199 | p = (AbsListView.LayoutParams) generateDefaultLayoutParams(); |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 1200 | child.setLayoutParams(p); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1201 | } |
| 1202 | p.viewType = mAdapter.getItemViewType(position); |
Alan Viverette | 92539d5 | 2015-09-14 10:49:25 -0400 | [diff] [blame] | 1203 | p.isEnabled = mAdapter.isEnabled(position); |
Romain Guy | 0bf8859 | 2010-03-02 13:38:44 -0800 | [diff] [blame] | 1204 | p.forceAdd = true; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1205 | |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1206 | final int childWidthSpec = ViewGroup.getChildMeasureSpec(widthMeasureSpec, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1207 | mListPadding.left + mListPadding.right, p.width); |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1208 | final int lpHeight = p.height; |
| 1209 | final int childHeightSpec; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1210 | if (lpHeight > 0) { |
| 1211 | childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY); |
| 1212 | } else { |
Adam Powell | d5dbf4b | 2015-06-11 13:19:24 -0700 | [diff] [blame] | 1213 | childHeightSpec = MeasureSpec.makeSafeMeasureSpec(heightHint, MeasureSpec.UNSPECIFIED); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1214 | } |
| 1215 | child.measure(childWidthSpec, childHeightSpec); |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1216 | |
| 1217 | // Since this view was measured directly aginst the parent measure |
| 1218 | // spec, we must measure it again before reuse. |
| 1219 | child.forceLayout(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1220 | } |
| 1221 | |
| 1222 | /** |
| 1223 | * @return True to recycle the views used to measure this ListView in |
| 1224 | * UNSPECIFIED/AT_MOST modes, false otherwise. |
| 1225 | * @hide |
| 1226 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 1227 | @ViewDebug.ExportedProperty(category = "list") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1228 | protected boolean recycleOnMeasure() { |
| 1229 | return true; |
| 1230 | } |
| 1231 | |
| 1232 | /** |
| 1233 | * Measures the height of the given range of children (inclusive) and |
| 1234 | * returns the height with this ListView's padding and divider heights |
| 1235 | * included. If maxHeight is provided, the measuring will stop when the |
| 1236 | * current height reaches maxHeight. |
| 1237 | * |
| 1238 | * @param widthMeasureSpec The width measure spec to be given to a child's |
| 1239 | * {@link View#measure(int, int)}. |
| 1240 | * @param startPosition The position of the first child to be shown. |
| 1241 | * @param endPosition The (inclusive) position of the last child to be |
| 1242 | * shown. Specify {@link #NO_POSITION} if the last child should be |
| 1243 | * the last available child from the adapter. |
| 1244 | * @param maxHeight The maximum height that will be returned (if all the |
| 1245 | * children don't fit in this value, this value will be |
| 1246 | * returned). |
| 1247 | * @param disallowPartialChildPosition In general, whether the returned |
| 1248 | * height should only contain entire children. This is more |
| 1249 | * powerful--it is the first inclusive position at which partial |
| 1250 | * children will not be allowed. Example: it looks nice to have |
| 1251 | * at least 3 completely visible children, and in portrait this |
| 1252 | * will most likely fit; but in landscape there could be times |
| 1253 | * when even 2 children can not be completely shown, so a value |
| 1254 | * of 2 (remember, inclusive) would be good (assuming |
| 1255 | * startPosition is 0). |
| 1256 | * @return The height of this ListView with the given children. |
| 1257 | */ |
| 1258 | final int measureHeightOfChildren(int widthMeasureSpec, int startPosition, int endPosition, |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1259 | int maxHeight, int disallowPartialChildPosition) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1260 | final ListAdapter adapter = mAdapter; |
| 1261 | if (adapter == null) { |
| 1262 | return mListPadding.top + mListPadding.bottom; |
| 1263 | } |
| 1264 | |
| 1265 | // Include the padding of the list |
| 1266 | int returnedHeight = mListPadding.top + mListPadding.bottom; |
| 1267 | final int dividerHeight = ((mDividerHeight > 0) && mDivider != null) ? mDividerHeight : 0; |
| 1268 | // The previous height value that was less than maxHeight and contained |
| 1269 | // no partial children |
| 1270 | int prevHeightWithoutPartialChild = 0; |
| 1271 | int i; |
| 1272 | View child; |
| 1273 | |
| 1274 | // mItemCount - 1 since endPosition parameter is inclusive |
| 1275 | endPosition = (endPosition == NO_POSITION) ? adapter.getCount() - 1 : endPosition; |
| 1276 | final AbsListView.RecycleBin recycleBin = mRecycler; |
| 1277 | final boolean recyle = recycleOnMeasure(); |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1278 | final boolean[] isScrap = mIsScrap; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1279 | |
| 1280 | for (i = startPosition; i <= endPosition; ++i) { |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1281 | child = obtainView(i, isScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1282 | |
Filip Gruszczynski | b6824bf | 2015-04-13 09:16:25 -0700 | [diff] [blame] | 1283 | measureScrapChild(child, i, widthMeasureSpec, maxHeight); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1284 | |
| 1285 | if (i > 0) { |
| 1286 | // Count the divider for all but one child |
| 1287 | returnedHeight += dividerHeight; |
| 1288 | } |
| 1289 | |
| 1290 | // Recycle the view before we possibly return from the method |
Romain Guy | 9c3184cc | 2010-02-25 17:32:54 -0800 | [diff] [blame] | 1291 | if (recyle && recycleBin.shouldRecycleViewType( |
| 1292 | ((LayoutParams) child.getLayoutParams()).viewType)) { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1293 | recycleBin.addScrapView(child, -1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1294 | } |
| 1295 | |
| 1296 | returnedHeight += child.getMeasuredHeight(); |
| 1297 | |
| 1298 | if (returnedHeight >= maxHeight) { |
| 1299 | // We went over, figure out which height to return. If returnedHeight > maxHeight, |
| 1300 | // then the i'th position did not fit completely. |
| 1301 | return (disallowPartialChildPosition >= 0) // Disallowing is enabled (> -1) |
| 1302 | && (i > disallowPartialChildPosition) // We've past the min pos |
| 1303 | && (prevHeightWithoutPartialChild > 0) // We have a prev height |
| 1304 | && (returnedHeight != maxHeight) // i'th child did not fit completely |
| 1305 | ? prevHeightWithoutPartialChild |
| 1306 | : maxHeight; |
| 1307 | } |
| 1308 | |
| 1309 | if ((disallowPartialChildPosition >= 0) && (i >= disallowPartialChildPosition)) { |
| 1310 | prevHeightWithoutPartialChild = returnedHeight; |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | // At this point, we went through the range of children, and they each |
| 1315 | // completely fit, so return the returnedHeight |
| 1316 | return returnedHeight; |
| 1317 | } |
| 1318 | |
| 1319 | @Override |
| 1320 | int findMotionRow(int y) { |
| 1321 | int childCount = getChildCount(); |
| 1322 | if (childCount > 0) { |
Adam Powell | 84222e0 | 2010-03-11 13:42:57 -0800 | [diff] [blame] | 1323 | if (!mStackFromBottom) { |
| 1324 | for (int i = 0; i < childCount; i++) { |
| 1325 | View v = getChildAt(i); |
| 1326 | if (y <= v.getBottom()) { |
| 1327 | return mFirstPosition + i; |
| 1328 | } |
| 1329 | } |
| 1330 | } else { |
| 1331 | for (int i = childCount - 1; i >= 0; i--) { |
| 1332 | View v = getChildAt(i); |
| 1333 | if (y >= v.getTop()) { |
| 1334 | return mFirstPosition + i; |
| 1335 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1336 | } |
| 1337 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1338 | } |
| 1339 | return INVALID_POSITION; |
| 1340 | } |
| 1341 | |
| 1342 | /** |
| 1343 | * Put a specific item at a specific location on the screen and then build |
| 1344 | * up and down from there. |
| 1345 | * |
| 1346 | * @param position The reference view to use as the starting point |
| 1347 | * @param top Pixel offset from the top of this view to the top of the |
| 1348 | * reference view. |
| 1349 | * |
| 1350 | * @return The selected view, or null if the selected view is outside the |
| 1351 | * visible area. |
| 1352 | */ |
| 1353 | private View fillSpecific(int position, int top) { |
| 1354 | boolean tempIsSelected = position == mSelectedPosition; |
| 1355 | View temp = makeAndAddView(position, top, true, mListPadding.left, tempIsSelected); |
| 1356 | // Possibly changed again in fillUp if we add rows above this one. |
| 1357 | mFirstPosition = position; |
| 1358 | |
| 1359 | View above; |
| 1360 | View below; |
| 1361 | |
| 1362 | final int dividerHeight = mDividerHeight; |
| 1363 | if (!mStackFromBottom) { |
| 1364 | above = fillUp(position - 1, temp.getTop() - dividerHeight); |
| 1365 | // This will correct for the top of the first view not touching the top of the list |
| 1366 | adjustViewsUpOrDown(); |
| 1367 | below = fillDown(position + 1, temp.getBottom() + dividerHeight); |
| 1368 | int childCount = getChildCount(); |
| 1369 | if (childCount > 0) { |
| 1370 | correctTooHigh(childCount); |
| 1371 | } |
| 1372 | } else { |
| 1373 | below = fillDown(position + 1, temp.getBottom() + dividerHeight); |
| 1374 | // This will correct for the bottom of the last view not touching the bottom of the list |
| 1375 | adjustViewsUpOrDown(); |
| 1376 | above = fillUp(position - 1, temp.getTop() - dividerHeight); |
| 1377 | int childCount = getChildCount(); |
| 1378 | if (childCount > 0) { |
| 1379 | correctTooLow(childCount); |
| 1380 | } |
| 1381 | } |
| 1382 | |
| 1383 | if (tempIsSelected) { |
| 1384 | return temp; |
| 1385 | } else if (above != null) { |
| 1386 | return above; |
| 1387 | } else { |
| 1388 | return below; |
| 1389 | } |
| 1390 | } |
| 1391 | |
| 1392 | /** |
| 1393 | * Check if we have dragged the bottom of the list too high (we have pushed the |
| 1394 | * top element off the top of the screen when we did not need to). Correct by sliding |
| 1395 | * everything back down. |
| 1396 | * |
| 1397 | * @param childCount Number of children |
| 1398 | */ |
| 1399 | private void correctTooHigh(int childCount) { |
| 1400 | // First see if the last item is visible. If it is not, it is OK for the |
| 1401 | // top of the list to be pushed up. |
| 1402 | int lastPosition = mFirstPosition + childCount - 1; |
| 1403 | if (lastPosition == mItemCount - 1 && childCount > 0) { |
| 1404 | |
| 1405 | // Get the last child ... |
| 1406 | final View lastChild = getChildAt(childCount - 1); |
| 1407 | |
| 1408 | // ... and its bottom edge |
| 1409 | final int lastBottom = lastChild.getBottom(); |
| 1410 | |
| 1411 | // This is bottom of our drawable area |
| 1412 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 1413 | |
| 1414 | // This is how far the bottom edge of the last view is from the bottom of the |
| 1415 | // drawable area |
| 1416 | int bottomOffset = end - lastBottom; |
| 1417 | View firstChild = getChildAt(0); |
| 1418 | final int firstTop = firstChild.getTop(); |
| 1419 | |
| 1420 | // Make sure we are 1) Too high, and 2) Either there are more rows above the |
| 1421 | // first row or the first row is scrolled off the top of the drawable area |
| 1422 | if (bottomOffset > 0 && (mFirstPosition > 0 || firstTop < mListPadding.top)) { |
| 1423 | if (mFirstPosition == 0) { |
| 1424 | // Don't pull the top too far down |
| 1425 | bottomOffset = Math.min(bottomOffset, mListPadding.top - firstTop); |
| 1426 | } |
| 1427 | // Move everything down |
| 1428 | offsetChildrenTopAndBottom(bottomOffset); |
| 1429 | if (mFirstPosition > 0) { |
| 1430 | // Fill the gap that was opened above mFirstPosition with more rows, if |
| 1431 | // possible |
| 1432 | fillUp(mFirstPosition - 1, firstChild.getTop() - mDividerHeight); |
| 1433 | // Close up the remaining gap |
| 1434 | adjustViewsUpOrDown(); |
| 1435 | } |
| 1436 | |
| 1437 | } |
| 1438 | } |
| 1439 | } |
| 1440 | |
| 1441 | /** |
| 1442 | * Check if we have dragged the bottom of the list too low (we have pushed the |
| 1443 | * bottom element off the bottom of the screen when we did not need to). Correct by sliding |
| 1444 | * everything back up. |
| 1445 | * |
| 1446 | * @param childCount Number of children |
| 1447 | */ |
| 1448 | private void correctTooLow(int childCount) { |
| 1449 | // First see if the first item is visible. If it is not, it is OK for the |
| 1450 | // bottom of the list to be pushed down. |
| 1451 | if (mFirstPosition == 0 && childCount > 0) { |
| 1452 | |
| 1453 | // Get the first child ... |
| 1454 | final View firstChild = getChildAt(0); |
| 1455 | |
| 1456 | // ... and its top edge |
| 1457 | final int firstTop = firstChild.getTop(); |
| 1458 | |
| 1459 | // This is top of our drawable area |
| 1460 | final int start = mListPadding.top; |
| 1461 | |
| 1462 | // This is bottom of our drawable area |
| 1463 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 1464 | |
| 1465 | // This is how far the top edge of the first view is from the top of the |
| 1466 | // drawable area |
| 1467 | int topOffset = firstTop - start; |
| 1468 | View lastChild = getChildAt(childCount - 1); |
| 1469 | final int lastBottom = lastChild.getBottom(); |
| 1470 | int lastPosition = mFirstPosition + childCount - 1; |
| 1471 | |
| 1472 | // Make sure we are 1) Too low, and 2) Either there are more rows below the |
| 1473 | // last row or the last row is scrolled off the bottom of the drawable area |
Romain Guy | 6198ae8 | 2009-08-31 17:45:55 -0700 | [diff] [blame] | 1474 | if (topOffset > 0) { |
| 1475 | if (lastPosition < mItemCount - 1 || lastBottom > end) { |
| 1476 | if (lastPosition == mItemCount - 1) { |
| 1477 | // Don't pull the bottom too far up |
| 1478 | topOffset = Math.min(topOffset, lastBottom - end); |
| 1479 | } |
| 1480 | // Move everything up |
| 1481 | offsetChildrenTopAndBottom(-topOffset); |
| 1482 | if (lastPosition < mItemCount - 1) { |
| 1483 | // Fill the gap that was opened below the last position with more rows, if |
| 1484 | // possible |
| 1485 | fillDown(lastPosition + 1, lastChild.getBottom() + mDividerHeight); |
| 1486 | // Close up the remaining gap |
| 1487 | adjustViewsUpOrDown(); |
| 1488 | } |
| 1489 | } else if (lastPosition == mItemCount - 1) { |
| 1490 | adjustViewsUpOrDown(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1491 | } |
| 1492 | } |
| 1493 | } |
| 1494 | } |
| 1495 | |
| 1496 | @Override |
| 1497 | protected void layoutChildren() { |
| 1498 | final boolean blockLayoutRequests = mBlockLayoutRequests; |
Alan Viverette | d44696c | 2013-07-18 10:37:15 -0700 | [diff] [blame] | 1499 | if (blockLayoutRequests) { |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 1500 | return; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1501 | } |
| 1502 | |
Alan Viverette | d44696c | 2013-07-18 10:37:15 -0700 | [diff] [blame] | 1503 | mBlockLayoutRequests = true; |
| 1504 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1505 | try { |
| 1506 | super.layoutChildren(); |
| 1507 | |
| 1508 | invalidate(); |
| 1509 | |
| 1510 | if (mAdapter == null) { |
| 1511 | resetList(); |
| 1512 | invokeOnItemScrollListener(); |
| 1513 | return; |
| 1514 | } |
| 1515 | |
Alan Viverette | d44696c | 2013-07-18 10:37:15 -0700 | [diff] [blame] | 1516 | final int childrenTop = mListPadding.top; |
| 1517 | final int childrenBottom = mBottom - mTop - mListPadding.bottom; |
| 1518 | final int childCount = getChildCount(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1519 | |
Romain Guy | ead0d4d | 2009-12-08 17:33:53 -0800 | [diff] [blame] | 1520 | int index = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1521 | int delta = 0; |
| 1522 | |
| 1523 | View sel; |
| 1524 | View oldSel = null; |
| 1525 | View oldFirst = null; |
| 1526 | View newSel = null; |
| 1527 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1528 | // Remember stuff we will need down below |
| 1529 | switch (mLayoutMode) { |
| 1530 | case LAYOUT_SET_SELECTION: |
| 1531 | index = mNextSelectedPosition - mFirstPosition; |
| 1532 | if (index >= 0 && index < childCount) { |
| 1533 | newSel = getChildAt(index); |
| 1534 | } |
| 1535 | break; |
| 1536 | case LAYOUT_FORCE_TOP: |
| 1537 | case LAYOUT_FORCE_BOTTOM: |
| 1538 | case LAYOUT_SPECIFIC: |
| 1539 | case LAYOUT_SYNC: |
| 1540 | break; |
| 1541 | case LAYOUT_MOVE_SELECTION: |
| 1542 | default: |
| 1543 | // Remember the previously selected view |
| 1544 | index = mSelectedPosition - mFirstPosition; |
| 1545 | if (index >= 0 && index < childCount) { |
| 1546 | oldSel = getChildAt(index); |
| 1547 | } |
| 1548 | |
| 1549 | // Remember the previous first child |
| 1550 | oldFirst = getChildAt(0); |
| 1551 | |
| 1552 | if (mNextSelectedPosition >= 0) { |
| 1553 | delta = mNextSelectedPosition - mSelectedPosition; |
| 1554 | } |
| 1555 | |
| 1556 | // Caution: newSel might be null |
| 1557 | newSel = getChildAt(index + delta); |
| 1558 | } |
| 1559 | |
| 1560 | |
| 1561 | boolean dataChanged = mDataChanged; |
| 1562 | if (dataChanged) { |
| 1563 | handleDataChanged(); |
| 1564 | } |
| 1565 | |
| 1566 | // Handle the empty set by removing all views that are visible |
| 1567 | // and calling it a day |
| 1568 | if (mItemCount == 0) { |
| 1569 | resetList(); |
| 1570 | invokeOnItemScrollListener(); |
| 1571 | return; |
Romain Guy | b45f124 | 2009-03-24 21:30:00 -0700 | [diff] [blame] | 1572 | } else if (mItemCount != mAdapter.getCount()) { |
| 1573 | throw new IllegalStateException("The content of the adapter has changed but " |
| 1574 | + "ListView did not receive a notification. Make sure the content of " |
Alan Viverette | 7d8314d | 2013-09-10 11:22:53 -0700 | [diff] [blame] | 1575 | + "your adapter is not modified from a background thread, but only from " |
| 1576 | + "the UI thread. Make sure your adapter calls notifyDataSetChanged() " |
| 1577 | + "when its content changes. [in ListView(" + getId() + ", " + getClass() |
Owen Lin | 3940f2d | 2009-08-13 15:21:16 +0800 | [diff] [blame] | 1578 | + ") with Adapter(" + mAdapter.getClass() + ")]"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1579 | } |
| 1580 | |
| 1581 | setSelectedPositionInt(mNextSelectedPosition); |
| 1582 | |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1583 | AccessibilityNodeInfo accessibilityFocusLayoutRestoreNode = null; |
| 1584 | View accessibilityFocusLayoutRestoreView = null; |
| 1585 | int accessibilityFocusPosition = INVALID_POSITION; |
| 1586 | |
| 1587 | // Remember which child, if any, had accessibility focus. This must |
| 1588 | // occur before recycling any views, since that will clear |
| 1589 | // accessibility focus. |
| 1590 | final ViewRootImpl viewRootImpl = getViewRootImpl(); |
| 1591 | if (viewRootImpl != null) { |
| 1592 | final View focusHost = viewRootImpl.getAccessibilityFocusedHost(); |
| 1593 | if (focusHost != null) { |
| 1594 | final View focusChild = getAccessibilityFocusedChild(focusHost); |
| 1595 | if (focusChild != null) { |
| 1596 | if (!dataChanged || isDirectChildHeaderOrFooter(focusChild) |
| 1597 | || focusChild.hasTransientState() || mAdapterHasStableIds) { |
| 1598 | // The views won't be changing, so try to maintain |
| 1599 | // focus on the current host and virtual view. |
| 1600 | accessibilityFocusLayoutRestoreView = focusHost; |
| 1601 | accessibilityFocusLayoutRestoreNode = viewRootImpl |
| 1602 | .getAccessibilityFocusedVirtualView(); |
| 1603 | } |
| 1604 | |
| 1605 | // If all else fails, maintain focus at the same |
| 1606 | // position. |
| 1607 | accessibilityFocusPosition = getPositionForView(focusChild); |
| 1608 | } |
| 1609 | } |
Alan Viverette | b53c5f6 | 2013-03-15 15:50:37 -0700 | [diff] [blame] | 1610 | } |
| 1611 | |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1612 | View focusLayoutRestoreDirectChild = null; |
| 1613 | View focusLayoutRestoreView = null; |
| 1614 | |
| 1615 | // Take focus back to us temporarily to avoid the eventual call to |
| 1616 | // clear focus when removing the focused child below from messing |
| 1617 | // things up when ViewAncestor assigns focus back to someone else. |
Alan Viverette | d44696c | 2013-07-18 10:37:15 -0700 | [diff] [blame] | 1618 | final View focusedChild = getFocusedChild(); |
| 1619 | if (focusedChild != null) { |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1620 | // TODO: in some cases focusedChild.getParent() == null |
| 1621 | |
| 1622 | // We can remember the focused view to restore after re-layout |
| 1623 | // if the data hasn't changed, or if the focused position is a |
| 1624 | // header or footer. |
Alan Viverette | 2b460d0 | 2015-07-06 11:01:50 -0700 | [diff] [blame] | 1625 | if (!dataChanged || isDirectChildHeaderOrFooter(focusedChild) |
| 1626 | || focusedChild.hasTransientState() || mAdapterHasStableIds) { |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1627 | focusLayoutRestoreDirectChild = focusedChild; |
| 1628 | // Remember the specific view that had focus. |
| 1629 | focusLayoutRestoreView = findFocus(); |
| 1630 | if (focusLayoutRestoreView != null) { |
| 1631 | // Tell it we are going to mess with it. |
| 1632 | focusLayoutRestoreView.onStartTemporaryDetach(); |
| 1633 | } |
| 1634 | } |
| 1635 | requestFocus(); |
Alan Viverette | d44696c | 2013-07-18 10:37:15 -0700 | [diff] [blame] | 1636 | } |
| 1637 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1638 | // Pull all children into the RecycleBin. |
| 1639 | // These views will be reused if possible |
| 1640 | final int firstPosition = mFirstPosition; |
| 1641 | final RecycleBin recycleBin = mRecycler; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1642 | if (dataChanged) { |
| 1643 | for (int i = 0; i < childCount; i++) { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1644 | recycleBin.addScrapView(getChildAt(i), firstPosition+i); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1645 | } |
| 1646 | } else { |
| 1647 | recycleBin.fillActiveViews(childCount, firstPosition); |
| 1648 | } |
| 1649 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1650 | // Clear out old views |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1651 | detachAllViewsFromParent(); |
Adam Powell | 539ee87 | 2012-02-03 19:00:49 -0800 | [diff] [blame] | 1652 | recycleBin.removeSkippedScrap(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1653 | |
| 1654 | switch (mLayoutMode) { |
| 1655 | case LAYOUT_SET_SELECTION: |
| 1656 | if (newSel != null) { |
| 1657 | sel = fillFromSelection(newSel.getTop(), childrenTop, childrenBottom); |
| 1658 | } else { |
| 1659 | sel = fillFromMiddle(childrenTop, childrenBottom); |
| 1660 | } |
| 1661 | break; |
| 1662 | case LAYOUT_SYNC: |
| 1663 | sel = fillSpecific(mSyncPosition, mSpecificTop); |
| 1664 | break; |
| 1665 | case LAYOUT_FORCE_BOTTOM: |
| 1666 | sel = fillUp(mItemCount - 1, childrenBottom); |
| 1667 | adjustViewsUpOrDown(); |
| 1668 | break; |
| 1669 | case LAYOUT_FORCE_TOP: |
| 1670 | mFirstPosition = 0; |
| 1671 | sel = fillFromTop(childrenTop); |
| 1672 | adjustViewsUpOrDown(); |
| 1673 | break; |
| 1674 | case LAYOUT_SPECIFIC: |
| 1675 | sel = fillSpecific(reconcileSelectedPosition(), mSpecificTop); |
| 1676 | break; |
| 1677 | case LAYOUT_MOVE_SELECTION: |
| 1678 | sel = moveSelection(oldSel, newSel, delta, childrenTop, childrenBottom); |
| 1679 | break; |
| 1680 | default: |
| 1681 | if (childCount == 0) { |
| 1682 | if (!mStackFromBottom) { |
| 1683 | final int position = lookForSelectablePosition(0, true); |
| 1684 | setSelectedPositionInt(position); |
| 1685 | sel = fillFromTop(childrenTop); |
| 1686 | } else { |
| 1687 | final int position = lookForSelectablePosition(mItemCount - 1, false); |
| 1688 | setSelectedPositionInt(position); |
| 1689 | sel = fillUp(mItemCount - 1, childrenBottom); |
| 1690 | } |
| 1691 | } else { |
| 1692 | if (mSelectedPosition >= 0 && mSelectedPosition < mItemCount) { |
| 1693 | sel = fillSpecific(mSelectedPosition, |
| 1694 | oldSel == null ? childrenTop : oldSel.getTop()); |
| 1695 | } else if (mFirstPosition < mItemCount) { |
| 1696 | sel = fillSpecific(mFirstPosition, |
| 1697 | oldFirst == null ? childrenTop : oldFirst.getTop()); |
| 1698 | } else { |
| 1699 | sel = fillSpecific(0, childrenTop); |
| 1700 | } |
| 1701 | } |
| 1702 | break; |
| 1703 | } |
| 1704 | |
| 1705 | // Flush any cached views that did not get reused above |
| 1706 | recycleBin.scrapActiveViews(); |
| 1707 | |
| 1708 | if (sel != null) { |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1709 | // The current selected item should get focus if items are |
| 1710 | // focusable. |
| 1711 | if (mItemsCanFocus && hasFocus() && !sel.hasFocus()) { |
| 1712 | final boolean focusWasTaken = (sel == focusLayoutRestoreDirectChild && |
| 1713 | focusLayoutRestoreView != null && |
| 1714 | focusLayoutRestoreView.requestFocus()) || sel.requestFocus(); |
| 1715 | if (!focusWasTaken) { |
| 1716 | // Selected item didn't take focus, but we still want to |
| 1717 | // make sure something else outside of the selected view |
| 1718 | // has focus. |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1719 | final View focused = getFocusedChild(); |
| 1720 | if (focused != null) { |
| 1721 | focused.clearFocus(); |
| 1722 | } |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1723 | positionSelector(INVALID_POSITION, sel); |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1724 | } else { |
| 1725 | sel.setSelected(false); |
| 1726 | mSelectorRect.setEmpty(); |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1727 | } |
| 1728 | } else { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1729 | positionSelector(INVALID_POSITION, sel); |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1730 | } |
| 1731 | mSelectedTop = sel.getTop(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1732 | } else { |
Alan Viverette | e3c433a | 2014-06-19 12:48:45 -0700 | [diff] [blame] | 1733 | final boolean inTouchMode = mTouchMode == TOUCH_MODE_TAP |
| 1734 | || mTouchMode == TOUCH_MODE_DONE_WAITING; |
| 1735 | if (inTouchMode) { |
| 1736 | // If the user's finger is down, select the motion position. |
Alan Viverette | d44696c | 2013-07-18 10:37:15 -0700 | [diff] [blame] | 1737 | final View child = getChildAt(mMotionPosition - mFirstPosition); |
Alan Viverette | e3c433a | 2014-06-19 12:48:45 -0700 | [diff] [blame] | 1738 | if (child != null) { |
Alan Viverette | d44696c | 2013-07-18 10:37:15 -0700 | [diff] [blame] | 1739 | positionSelector(mMotionPosition, child); |
| 1740 | } |
Alan Viverette | e3c433a | 2014-06-19 12:48:45 -0700 | [diff] [blame] | 1741 | } else if (mSelectorPosition != INVALID_POSITION) { |
| 1742 | // If we had previously positioned the selector somewhere, |
| 1743 | // put it back there. It might not match up with the data, |
| 1744 | // but it's transitioning out so it's not a big deal. |
| 1745 | final View child = getChildAt(mSelectorPosition - mFirstPosition); |
| 1746 | if (child != null) { |
| 1747 | positionSelector(mSelectorPosition, child); |
| 1748 | } |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1749 | } else { |
Alan Viverette | e3c433a | 2014-06-19 12:48:45 -0700 | [diff] [blame] | 1750 | // Otherwise, clear selection. |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1751 | mSelectedTop = 0; |
| 1752 | mSelectorRect.setEmpty(); |
| 1753 | } |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1754 | |
| 1755 | // Even if there is not selected position, we may need to |
| 1756 | // restore focus (i.e. something focusable in touch mode). |
| 1757 | if (hasFocus() && focusLayoutRestoreView != null) { |
| 1758 | focusLayoutRestoreView.requestFocus(); |
| 1759 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1760 | } |
| 1761 | |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1762 | // Attempt to restore accessibility focus, if necessary. |
Alan Viverette | 2e6fc8c | 2014-02-24 11:09:18 -0800 | [diff] [blame] | 1763 | if (viewRootImpl != null) { |
| 1764 | final View newAccessibilityFocusedView = viewRootImpl.getAccessibilityFocusedHost(); |
| 1765 | if (newAccessibilityFocusedView == null) { |
| 1766 | if (accessibilityFocusLayoutRestoreView != null |
| 1767 | && accessibilityFocusLayoutRestoreView.isAttachedToWindow()) { |
| 1768 | final AccessibilityNodeProvider provider = |
| 1769 | accessibilityFocusLayoutRestoreView.getAccessibilityNodeProvider(); |
| 1770 | if (accessibilityFocusLayoutRestoreNode != null && provider != null) { |
| 1771 | final int virtualViewId = AccessibilityNodeInfo.getVirtualDescendantId( |
| 1772 | accessibilityFocusLayoutRestoreNode.getSourceNodeId()); |
| 1773 | provider.performAction(virtualViewId, |
| 1774 | AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null); |
| 1775 | } else { |
| 1776 | accessibilityFocusLayoutRestoreView.requestAccessibilityFocus(); |
| 1777 | } |
| 1778 | } else if (accessibilityFocusPosition != INVALID_POSITION) { |
| 1779 | // Bound the position within the visible children. |
| 1780 | final int position = MathUtils.constrain( |
| 1781 | accessibilityFocusPosition - mFirstPosition, 0, |
| 1782 | getChildCount() - 1); |
| 1783 | final View restoreView = getChildAt(position); |
| 1784 | if (restoreView != null) { |
| 1785 | restoreView.requestAccessibilityFocus(); |
| 1786 | } |
Alan Viverette | 6820751 | 2013-08-22 12:33:07 -0700 | [diff] [blame] | 1787 | } |
alanv | 30ee76c | 2012-09-07 10:31:16 -0700 | [diff] [blame] | 1788 | } |
| 1789 | } |
| 1790 | |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1791 | // Tell focus view we are done mucking with it, if it is still in |
| 1792 | // our view hierarchy. |
| 1793 | if (focusLayoutRestoreView != null |
| 1794 | && focusLayoutRestoreView.getWindowToken() != null) { |
| 1795 | focusLayoutRestoreView.onFinishTemporaryDetach(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1796 | } |
| 1797 | |
| 1798 | mLayoutMode = LAYOUT_NORMAL; |
| 1799 | mDataChanged = false; |
Adam Powell | 161abf3 | 2012-05-23 17:22:49 -0700 | [diff] [blame] | 1800 | if (mPositionScrollAfterLayout != null) { |
| 1801 | post(mPositionScrollAfterLayout); |
| 1802 | mPositionScrollAfterLayout = null; |
| 1803 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1804 | mNeedSync = false; |
| 1805 | setNextSelectedPositionInt(mSelectedPosition); |
| 1806 | |
| 1807 | updateScrollIndicators(); |
| 1808 | |
| 1809 | if (mItemCount > 0) { |
| 1810 | checkSelectionChanged(); |
| 1811 | } |
| 1812 | |
| 1813 | invokeOnItemScrollListener(); |
| 1814 | } finally { |
| 1815 | if (!blockLayoutRequests) { |
| 1816 | mBlockLayoutRequests = false; |
| 1817 | } |
| 1818 | } |
| 1819 | } |
| 1820 | |
| 1821 | /** |
Alan Viverette | 3e14162 | 2014-02-18 17:05:13 -0800 | [diff] [blame] | 1822 | * @param child a direct child of this list. |
| 1823 | * @return Whether child is a header or footer view. |
| 1824 | */ |
| 1825 | private boolean isDirectChildHeaderOrFooter(View child) { |
| 1826 | final ArrayList<FixedViewInfo> headers = mHeaderViewInfos; |
| 1827 | final int numHeaders = headers.size(); |
| 1828 | for (int i = 0; i < numHeaders; i++) { |
| 1829 | if (child == headers.get(i).view) { |
| 1830 | return true; |
| 1831 | } |
| 1832 | } |
| 1833 | |
| 1834 | final ArrayList<FixedViewInfo> footers = mFooterViewInfos; |
| 1835 | final int numFooters = footers.size(); |
| 1836 | for (int i = 0; i < numFooters; i++) { |
| 1837 | if (child == footers.get(i).view) { |
| 1838 | return true; |
| 1839 | } |
| 1840 | } |
| 1841 | |
| 1842 | return false; |
| 1843 | } |
| 1844 | |
| 1845 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1846 | * Obtain the view and add it to our list of children. The view can be made |
| 1847 | * fresh, converted from an unused view, or used as is if it was in the |
| 1848 | * recycle bin. |
| 1849 | * |
| 1850 | * @param position Logical position in the list |
| 1851 | * @param y Top or bottom edge of the view to add |
| 1852 | * @param flow If flow is true, align top edge to y. If false, align bottom |
| 1853 | * edge to y. |
| 1854 | * @param childrenLeft Left edge where children should be positioned |
| 1855 | * @param selected Is this position selected? |
| 1856 | * @return View that was added |
| 1857 | */ |
| 1858 | private View makeAndAddView(int position, int y, boolean flow, int childrenLeft, |
| 1859 | boolean selected) { |
| 1860 | View child; |
| 1861 | |
| 1862 | |
| 1863 | if (!mDataChanged) { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1864 | // Try to use an existing view for this position |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1865 | child = mRecycler.getActiveView(position); |
| 1866 | if (child != null) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1867 | // Found it -- we're using an existing child |
| 1868 | // This just needs to be positioned |
| 1869 | setupChild(child, position, y, flow, childrenLeft, selected, true); |
| 1870 | |
| 1871 | return child; |
| 1872 | } |
| 1873 | } |
| 1874 | |
| 1875 | // Make a new view for this position, or convert an unused view if possible |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1876 | child = obtainView(position, mIsScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1877 | |
| 1878 | // This needs to be positioned and measured |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1879 | setupChild(child, position, y, flow, childrenLeft, selected, mIsScrap[0]); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1880 | |
| 1881 | return child; |
| 1882 | } |
| 1883 | |
| 1884 | /** |
| 1885 | * Add a view as a child and make sure it is measured (if necessary) and |
| 1886 | * positioned properly. |
| 1887 | * |
| 1888 | * @param child The view to add |
| 1889 | * @param position The position of this child |
| 1890 | * @param y The y position relative to which this view will be positioned |
| 1891 | * @param flowDown If true, align top edge to y. If false, align bottom |
| 1892 | * edge to y. |
| 1893 | * @param childrenLeft Left edge where children should be positioned |
| 1894 | * @param selected Is this position selected? |
| 1895 | * @param recycled Has this view been pulled from the recycle bin? If so it |
| 1896 | * does not need to be remeasured. |
| 1897 | */ |
| 1898 | private void setupChild(View child, int position, int y, boolean flowDown, int childrenLeft, |
| 1899 | boolean selected, boolean recycled) { |
Romain Guy | 5fade8c | 2013-07-10 16:36:18 -0700 | [diff] [blame] | 1900 | Trace.traceBegin(Trace.TRACE_TAG_VIEW, "setupListItem"); |
| 1901 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1902 | final boolean isSelected = selected && shouldShowSelector(); |
| 1903 | final boolean updateChildSelected = isSelected != child.isSelected(); |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1904 | final int mode = mTouchMode; |
| 1905 | final boolean isPressed = mode > TOUCH_MODE_DOWN && mode < TOUCH_MODE_SCROLL && |
| 1906 | mMotionPosition == position; |
| 1907 | final boolean updateChildPressed = isPressed != child.isPressed(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1908 | final boolean needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested(); |
| 1909 | |
| 1910 | // Respect layout params that are already in the view. Otherwise make some up... |
| 1911 | // noinspection unchecked |
| 1912 | AbsListView.LayoutParams p = (AbsListView.LayoutParams) child.getLayoutParams(); |
| 1913 | if (p == null) { |
Adam Powell | aebd28f | 2012-02-22 10:31:16 -0800 | [diff] [blame] | 1914 | p = (AbsListView.LayoutParams) generateDefaultLayoutParams(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1915 | } |
| 1916 | p.viewType = mAdapter.getItemViewType(position); |
Alan Viverette | 92539d5 | 2015-09-14 10:49:25 -0400 | [diff] [blame] | 1917 | p.isEnabled = mAdapter.isEnabled(position); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1918 | |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1919 | if ((recycled && !p.forceAdd) || (p.recycledHeaderFooter |
| 1920 | && p.viewType == AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER)) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1921 | attachViewToParent(child, flowDown ? -1 : 0, p); |
| 1922 | } else { |
Romain Guy | 0bf8859 | 2010-03-02 13:38:44 -0800 | [diff] [blame] | 1923 | p.forceAdd = false; |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 1924 | if (p.viewType == AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER) { |
| 1925 | p.recycledHeaderFooter = true; |
| 1926 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1927 | addViewInLayout(child, flowDown ? -1 : 0, p, true); |
| 1928 | } |
| 1929 | |
| 1930 | if (updateChildSelected) { |
| 1931 | child.setSelected(isSelected); |
| 1932 | } |
| 1933 | |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1934 | if (updateChildPressed) { |
| 1935 | child.setPressed(isPressed); |
| 1936 | } |
| 1937 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1938 | if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) { |
| 1939 | if (child instanceof Checkable) { |
| 1940 | ((Checkable) child).setChecked(mCheckStates.get(position)); |
Dianne Hackborn | d0fa371 | 2010-09-14 18:57:14 -0700 | [diff] [blame] | 1941 | } else if (getContext().getApplicationInfo().targetSdkVersion |
| 1942 | >= android.os.Build.VERSION_CODES.HONEYCOMB) { |
| 1943 | child.setActivated(mCheckStates.get(position)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1944 | } |
| 1945 | } |
| 1946 | |
| 1947 | if (needToMeasure) { |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1948 | final int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1949 | mListPadding.left + mListPadding.right, p.width); |
Alan Viverette | 2ea3292 | 2015-06-26 13:31:50 -0700 | [diff] [blame] | 1950 | final int lpHeight = p.height; |
| 1951 | final int childHeightSpec; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1952 | if (lpHeight > 0) { |
| 1953 | childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY); |
| 1954 | } else { |
Adam Powell | d5dbf4b | 2015-06-11 13:19:24 -0700 | [diff] [blame] | 1955 | childHeightSpec = MeasureSpec.makeSafeMeasureSpec(getMeasuredHeight(), |
Filip Gruszczynski | b6824bf | 2015-04-13 09:16:25 -0700 | [diff] [blame] | 1956 | MeasureSpec.UNSPECIFIED); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1957 | } |
| 1958 | child.measure(childWidthSpec, childHeightSpec); |
| 1959 | } else { |
| 1960 | cleanupLayoutState(child); |
| 1961 | } |
| 1962 | |
| 1963 | final int w = child.getMeasuredWidth(); |
| 1964 | final int h = child.getMeasuredHeight(); |
| 1965 | final int childTop = flowDown ? y : y - h; |
| 1966 | |
| 1967 | if (needToMeasure) { |
| 1968 | final int childRight = childrenLeft + w; |
| 1969 | final int childBottom = childTop + h; |
| 1970 | child.layout(childrenLeft, childTop, childRight, childBottom); |
| 1971 | } else { |
| 1972 | child.offsetLeftAndRight(childrenLeft - child.getLeft()); |
| 1973 | child.offsetTopAndBottom(childTop - child.getTop()); |
| 1974 | } |
| 1975 | |
| 1976 | if (mCachingStarted && !child.isDrawingCacheEnabled()) { |
| 1977 | child.setDrawingCacheEnabled(true); |
| 1978 | } |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1979 | |
| 1980 | if (recycled && (((AbsListView.LayoutParams)child.getLayoutParams()).scrappedFromPosition) |
| 1981 | != position) { |
| 1982 | child.jumpDrawablesToCurrentState(); |
| 1983 | } |
Romain Guy | 5fade8c | 2013-07-10 16:36:18 -0700 | [diff] [blame] | 1984 | |
| 1985 | Trace.traceEnd(Trace.TRACE_TAG_VIEW); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1986 | } |
| 1987 | |
| 1988 | @Override |
| 1989 | protected boolean canAnimate() { |
| 1990 | return super.canAnimate() && mItemCount > 0; |
| 1991 | } |
| 1992 | |
| 1993 | /** |
| 1994 | * Sets the currently selected item. If in touch mode, the item will not be selected |
| 1995 | * but it will still be positioned appropriately. If the specified selection position |
| 1996 | * is less than 0, then the item at position 0 will be selected. |
| 1997 | * |
| 1998 | * @param position Index (starting at 0) of the data item to be selected. |
| 1999 | */ |
| 2000 | @Override |
| 2001 | public void setSelection(int position) { |
| 2002 | setSelectionFromTop(position, 0); |
| 2003 | } |
| 2004 | |
| 2005 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2006 | * Makes the item at the supplied position selected. |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 2007 | * |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2008 | * @param position the position of the item to select |
| 2009 | */ |
| 2010 | @Override |
| 2011 | void setSelectionInt(int position) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2012 | setNextSelectedPositionInt(position); |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 2013 | boolean awakeScrollbars = false; |
| 2014 | |
| 2015 | final int selectedPosition = mSelectedPosition; |
| 2016 | |
| 2017 | if (selectedPosition >= 0) { |
| 2018 | if (position == selectedPosition - 1) { |
| 2019 | awakeScrollbars = true; |
| 2020 | } else if (position == selectedPosition + 1) { |
| 2021 | awakeScrollbars = true; |
| 2022 | } |
| 2023 | } |
| 2024 | |
Adam Powell | 1fa179ef | 2012-04-12 15:01:40 -0700 | [diff] [blame] | 2025 | if (mPositionScroller != null) { |
| 2026 | mPositionScroller.stop(); |
| 2027 | } |
| 2028 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2029 | layoutChildren(); |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 2030 | |
| 2031 | if (awakeScrollbars) { |
| 2032 | awakenScrollBars(); |
| 2033 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2034 | } |
| 2035 | |
| 2036 | /** |
| 2037 | * Find a position that can be selected (i.e., is not a separator). |
| 2038 | * |
| 2039 | * @param position The starting position to look at. |
| 2040 | * @param lookDown Whether to look down for other positions. |
| 2041 | * @return The next selectable position starting at position and then searching either up or |
| 2042 | * down. Returns {@link #INVALID_POSITION} if nothing can be found. |
| 2043 | */ |
| 2044 | @Override |
| 2045 | int lookForSelectablePosition(int position, boolean lookDown) { |
| 2046 | final ListAdapter adapter = mAdapter; |
| 2047 | if (adapter == null || isInTouchMode()) { |
| 2048 | return INVALID_POSITION; |
| 2049 | } |
| 2050 | |
| 2051 | final int count = adapter.getCount(); |
| 2052 | if (!mAreAllItemsSelectable) { |
| 2053 | if (lookDown) { |
| 2054 | position = Math.max(0, position); |
| 2055 | while (position < count && !adapter.isEnabled(position)) { |
| 2056 | position++; |
| 2057 | } |
| 2058 | } else { |
| 2059 | position = Math.min(position, count - 1); |
| 2060 | while (position >= 0 && !adapter.isEnabled(position)) { |
| 2061 | position--; |
| 2062 | } |
| 2063 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2064 | } |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2065 | |
| 2066 | if (position < 0 || position >= count) { |
| 2067 | return INVALID_POSITION; |
| 2068 | } |
| 2069 | |
| 2070 | return position; |
| 2071 | } |
| 2072 | |
| 2073 | /** |
| 2074 | * Find a position that can be selected (i.e., is not a separator). If there |
| 2075 | * are no selectable positions in the specified direction from the starting |
| 2076 | * position, searches in the opposite direction from the starting position |
| 2077 | * to the current position. |
| 2078 | * |
| 2079 | * @param current the current position |
| 2080 | * @param position the starting position |
| 2081 | * @param lookDown whether to look down for other positions |
| 2082 | * @return the next selectable position, or {@link #INVALID_POSITION} if |
| 2083 | * nothing can be found |
| 2084 | */ |
| 2085 | int lookForSelectablePositionAfter(int current, int position, boolean lookDown) { |
| 2086 | final ListAdapter adapter = mAdapter; |
| 2087 | if (adapter == null || isInTouchMode()) { |
| 2088 | return INVALID_POSITION; |
| 2089 | } |
| 2090 | |
| 2091 | // First check after the starting position in the specified direction. |
| 2092 | final int after = lookForSelectablePosition(position, lookDown); |
| 2093 | if (after != INVALID_POSITION) { |
| 2094 | return after; |
| 2095 | } |
| 2096 | |
| 2097 | // Then check between the starting position and the current position. |
| 2098 | final int count = adapter.getCount(); |
| 2099 | current = MathUtils.constrain(current, -1, count - 1); |
| 2100 | if (lookDown) { |
| 2101 | position = Math.min(position - 1, count - 1); |
| 2102 | while ((position > current) && !adapter.isEnabled(position)) { |
| 2103 | position--; |
| 2104 | } |
| 2105 | if (position <= current) { |
| 2106 | return INVALID_POSITION; |
| 2107 | } |
| 2108 | } else { |
| 2109 | position = Math.max(0, position + 1); |
| 2110 | while ((position < current) && !adapter.isEnabled(position)) { |
| 2111 | position++; |
| 2112 | } |
| 2113 | if (position >= current) { |
| 2114 | return INVALID_POSITION; |
| 2115 | } |
| 2116 | } |
| 2117 | |
| 2118 | return position; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2119 | } |
| 2120 | |
| 2121 | /** |
| 2122 | * setSelectionAfterHeaderView set the selection to be the first list item |
| 2123 | * after the header views. |
| 2124 | */ |
| 2125 | public void setSelectionAfterHeaderView() { |
| 2126 | final int count = mHeaderViewInfos.size(); |
| 2127 | if (count > 0) { |
| 2128 | mNextSelectedPosition = 0; |
| 2129 | return; |
| 2130 | } |
| 2131 | |
| 2132 | if (mAdapter != null) { |
| 2133 | setSelection(count); |
| 2134 | } else { |
| 2135 | mNextSelectedPosition = count; |
| 2136 | mLayoutMode = LAYOUT_SET_SELECTION; |
| 2137 | } |
| 2138 | |
| 2139 | } |
| 2140 | |
| 2141 | @Override |
| 2142 | public boolean dispatchKeyEvent(KeyEvent event) { |
| 2143 | // Dispatch in the normal way |
| 2144 | boolean handled = super.dispatchKeyEvent(event); |
| 2145 | if (!handled) { |
| 2146 | // If we didn't handle it... |
| 2147 | View focused = getFocusedChild(); |
| 2148 | if (focused != null && event.getAction() == KeyEvent.ACTION_DOWN) { |
| 2149 | // ... and our focused child didn't handle it |
| 2150 | // ... give it to ourselves so we can scroll if necessary |
| 2151 | handled = onKeyDown(event.getKeyCode(), event); |
| 2152 | } |
| 2153 | } |
| 2154 | return handled; |
| 2155 | } |
| 2156 | |
| 2157 | @Override |
| 2158 | public boolean onKeyDown(int keyCode, KeyEvent event) { |
| 2159 | return commonKey(keyCode, 1, event); |
| 2160 | } |
| 2161 | |
| 2162 | @Override |
| 2163 | public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { |
| 2164 | return commonKey(keyCode, repeatCount, event); |
| 2165 | } |
| 2166 | |
| 2167 | @Override |
| 2168 | public boolean onKeyUp(int keyCode, KeyEvent event) { |
| 2169 | return commonKey(keyCode, 1, event); |
| 2170 | } |
| 2171 | |
| 2172 | private boolean commonKey(int keyCode, int count, KeyEvent event) { |
Adam Powell | 31986b5 | 2013-09-24 14:53:30 -0700 | [diff] [blame] | 2173 | if (mAdapter == null || !isAttachedToWindow()) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2174 | return false; |
| 2175 | } |
| 2176 | |
| 2177 | if (mDataChanged) { |
| 2178 | layoutChildren(); |
| 2179 | } |
| 2180 | |
| 2181 | boolean handled = false; |
| 2182 | int action = event.getAction(); |
| 2183 | |
| 2184 | if (action != KeyEvent.ACTION_UP) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2185 | switch (keyCode) { |
| 2186 | case KeyEvent.KEYCODE_DPAD_UP: |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2187 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2188 | handled = resurrectSelectionIfNeeded(); |
| 2189 | if (!handled) { |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2190 | while (count-- > 0) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2191 | if (arrowScroll(FOCUS_UP)) { |
| 2192 | handled = true; |
| 2193 | } else { |
| 2194 | break; |
| 2195 | } |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2196 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2197 | } |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2198 | } else if (event.hasModifiers(KeyEvent.META_ALT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2199 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2200 | } |
| 2201 | break; |
| 2202 | |
| 2203 | case KeyEvent.KEYCODE_DPAD_DOWN: |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2204 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2205 | handled = resurrectSelectionIfNeeded(); |
| 2206 | if (!handled) { |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2207 | while (count-- > 0) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2208 | if (arrowScroll(FOCUS_DOWN)) { |
| 2209 | handled = true; |
| 2210 | } else { |
| 2211 | break; |
| 2212 | } |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2213 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2214 | } |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2215 | } else if (event.hasModifiers(KeyEvent.META_ALT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2216 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2217 | } |
| 2218 | break; |
| 2219 | |
| 2220 | case KeyEvent.KEYCODE_DPAD_LEFT: |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2221 | if (event.hasNoModifiers()) { |
| 2222 | handled = handleHorizontalFocusWithinListItem(View.FOCUS_LEFT); |
| 2223 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2224 | break; |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2225 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2226 | case KeyEvent.KEYCODE_DPAD_RIGHT: |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2227 | if (event.hasNoModifiers()) { |
| 2228 | handled = handleHorizontalFocusWithinListItem(View.FOCUS_RIGHT); |
| 2229 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2230 | break; |
| 2231 | |
| 2232 | case KeyEvent.KEYCODE_DPAD_CENTER: |
| 2233 | case KeyEvent.KEYCODE_ENTER: |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2234 | if (event.hasNoModifiers()) { |
| 2235 | handled = resurrectSelectionIfNeeded(); |
| 2236 | if (!handled |
| 2237 | && event.getRepeatCount() == 0 && getChildCount() > 0) { |
| 2238 | keyPressed(); |
| 2239 | handled = true; |
| 2240 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2241 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2242 | break; |
| 2243 | |
| 2244 | case KeyEvent.KEYCODE_SPACE: |
| 2245 | if (mPopup == null || !mPopup.isShowing()) { |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2246 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2247 | handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2248 | } else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2249 | handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_UP); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2250 | } |
| 2251 | handled = true; |
| 2252 | } |
| 2253 | break; |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2254 | |
| 2255 | case KeyEvent.KEYCODE_PAGE_UP: |
| 2256 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2257 | handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2258 | } else if (event.hasModifiers(KeyEvent.META_ALT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2259 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2260 | } |
| 2261 | break; |
| 2262 | |
| 2263 | case KeyEvent.KEYCODE_PAGE_DOWN: |
| 2264 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2265 | handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2266 | } else if (event.hasModifiers(KeyEvent.META_ALT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2267 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2268 | } |
| 2269 | break; |
| 2270 | |
| 2271 | case KeyEvent.KEYCODE_MOVE_HOME: |
| 2272 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2273 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2274 | } |
| 2275 | break; |
| 2276 | |
| 2277 | case KeyEvent.KEYCODE_MOVE_END: |
| 2278 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2279 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2280 | } |
| 2281 | break; |
| 2282 | |
| 2283 | case KeyEvent.KEYCODE_TAB: |
Alan Viverette | 760a2d8 | 2015-08-17 14:31:42 -0400 | [diff] [blame] | 2284 | // This creates an asymmetry in TAB navigation order. At some |
| 2285 | // point in the future we may decide that it's preferable to |
| 2286 | // force the list selection to the top or bottom when receiving |
| 2287 | // TAB focus from another widget, but for now this is adequate. |
| 2288 | if (event.hasNoModifiers()) { |
| 2289 | handled = resurrectSelectionIfNeeded() || arrowScroll(FOCUS_DOWN); |
| 2290 | } else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) { |
| 2291 | handled = resurrectSelectionIfNeeded() || arrowScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 2292 | } |
| 2293 | break; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2294 | } |
| 2295 | } |
| 2296 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2297 | if (handled) { |
| 2298 | return true; |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2299 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2300 | |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2301 | if (sendToTextFilter(keyCode, count, event)) { |
| 2302 | return true; |
| 2303 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2304 | |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2305 | switch (action) { |
| 2306 | case KeyEvent.ACTION_DOWN: |
| 2307 | return super.onKeyDown(keyCode, event); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2308 | |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 2309 | case KeyEvent.ACTION_UP: |
| 2310 | return super.onKeyUp(keyCode, event); |
| 2311 | |
| 2312 | case KeyEvent.ACTION_MULTIPLE: |
| 2313 | return super.onKeyMultiple(keyCode, count, event); |
| 2314 | |
| 2315 | default: // shouldn't happen |
| 2316 | return false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2317 | } |
| 2318 | } |
| 2319 | |
| 2320 | /** |
| 2321 | * Scrolls up or down by the number of items currently present on screen. |
| 2322 | * |
| 2323 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 2324 | * @return whether selection was moved |
| 2325 | */ |
| 2326 | boolean pageScroll(int direction) { |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2327 | final int nextPage; |
| 2328 | final boolean down; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2329 | |
| 2330 | if (direction == FOCUS_UP) { |
| 2331 | nextPage = Math.max(0, mSelectedPosition - getChildCount() - 1); |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2332 | down = false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2333 | } else if (direction == FOCUS_DOWN) { |
| 2334 | nextPage = Math.min(mItemCount - 1, mSelectedPosition + getChildCount() - 1); |
| 2335 | down = true; |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2336 | } else { |
| 2337 | return false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2338 | } |
| 2339 | |
| 2340 | if (nextPage >= 0) { |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2341 | final int position = lookForSelectablePositionAfter(mSelectedPosition, nextPage, down); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2342 | if (position >= 0) { |
| 2343 | mLayoutMode = LAYOUT_SPECIFIC; |
| 2344 | mSpecificTop = mPaddingTop + getVerticalFadingEdgeLength(); |
| 2345 | |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2346 | if (down && (position > (mItemCount - getChildCount()))) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2347 | mLayoutMode = LAYOUT_FORCE_BOTTOM; |
| 2348 | } |
| 2349 | |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2350 | if (!down && (position < getChildCount())) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2351 | mLayoutMode = LAYOUT_FORCE_TOP; |
| 2352 | } |
| 2353 | |
| 2354 | setSelectionInt(position); |
| 2355 | invokeOnItemScrollListener(); |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 2356 | if (!awakenScrollBars()) { |
| 2357 | invalidate(); |
| 2358 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2359 | |
| 2360 | return true; |
| 2361 | } |
| 2362 | } |
| 2363 | |
| 2364 | return false; |
| 2365 | } |
| 2366 | |
| 2367 | /** |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2368 | * Go to the last or first item if possible (not worrying about panning |
| 2369 | * across or navigating within the internal focus of the currently selected |
| 2370 | * item.) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2371 | * |
| 2372 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2373 | * @return whether selection was moved |
| 2374 | */ |
| 2375 | boolean fullScroll(int direction) { |
| 2376 | boolean moved = false; |
| 2377 | if (direction == FOCUS_UP) { |
| 2378 | if (mSelectedPosition != 0) { |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2379 | final int position = lookForSelectablePositionAfter(mSelectedPosition, 0, true); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2380 | if (position >= 0) { |
| 2381 | mLayoutMode = LAYOUT_FORCE_TOP; |
| 2382 | setSelectionInt(position); |
| 2383 | invokeOnItemScrollListener(); |
| 2384 | } |
| 2385 | moved = true; |
| 2386 | } |
| 2387 | } else if (direction == FOCUS_DOWN) { |
Alan Viverette | af9c5ea | 2013-06-13 13:27:59 -0700 | [diff] [blame] | 2388 | final int lastItem = (mItemCount - 1); |
| 2389 | if (mSelectedPosition < lastItem) { |
| 2390 | final int position = lookForSelectablePositionAfter( |
| 2391 | mSelectedPosition, lastItem, false); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2392 | if (position >= 0) { |
| 2393 | mLayoutMode = LAYOUT_FORCE_BOTTOM; |
| 2394 | setSelectionInt(position); |
| 2395 | invokeOnItemScrollListener(); |
| 2396 | } |
| 2397 | moved = true; |
| 2398 | } |
| 2399 | } |
| 2400 | |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 2401 | if (moved && !awakenScrollBars()) { |
| 2402 | awakenScrollBars(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2403 | invalidate(); |
| 2404 | } |
| 2405 | |
| 2406 | return moved; |
| 2407 | } |
| 2408 | |
| 2409 | /** |
| 2410 | * To avoid horizontal focus searches changing the selected item, we |
| 2411 | * manually focus search within the selected item (as applicable), and |
| 2412 | * prevent focus from jumping to something within another item. |
| 2413 | * @param direction one of {View.FOCUS_LEFT, View.FOCUS_RIGHT} |
| 2414 | * @return Whether this consumes the key event. |
| 2415 | */ |
| 2416 | private boolean handleHorizontalFocusWithinListItem(int direction) { |
| 2417 | if (direction != View.FOCUS_LEFT && direction != View.FOCUS_RIGHT) { |
Romain Guy | 304eefa | 2009-03-24 20:01:49 -0700 | [diff] [blame] | 2418 | throw new IllegalArgumentException("direction must be one of" |
| 2419 | + " {View.FOCUS_LEFT, View.FOCUS_RIGHT}"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2420 | } |
| 2421 | |
| 2422 | final int numChildren = getChildCount(); |
| 2423 | if (mItemsCanFocus && numChildren > 0 && mSelectedPosition != INVALID_POSITION) { |
| 2424 | final View selectedView = getSelectedView(); |
Romain Guy | 304eefa | 2009-03-24 20:01:49 -0700 | [diff] [blame] | 2425 | if (selectedView != null && selectedView.hasFocus() && |
| 2426 | selectedView instanceof ViewGroup) { |
| 2427 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2428 | final View currentFocus = selectedView.findFocus(); |
| 2429 | final View nextFocus = FocusFinder.getInstance().findNextFocus( |
Romain Guy | 304eefa | 2009-03-24 20:01:49 -0700 | [diff] [blame] | 2430 | (ViewGroup) selectedView, currentFocus, direction); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2431 | if (nextFocus != null) { |
| 2432 | // do the math to get interesting rect in next focus' coordinates |
Kenji Sugimoto | 827bb44 | 2014-04-10 17:46:23 +0900 | [diff] [blame] | 2433 | Rect focusedRect = mTempRect; |
| 2434 | if (currentFocus != null) { |
| 2435 | currentFocus.getFocusedRect(focusedRect); |
| 2436 | offsetDescendantRectToMyCoords(currentFocus, focusedRect); |
| 2437 | offsetRectIntoDescendantCoords(nextFocus, focusedRect); |
| 2438 | } else { |
| 2439 | focusedRect = null; |
| 2440 | } |
| 2441 | if (nextFocus.requestFocus(direction, focusedRect)) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2442 | return true; |
| 2443 | } |
| 2444 | } |
| 2445 | // we are blocking the key from being handled (by returning true) |
| 2446 | // if the global result is going to be some other view within this |
| 2447 | // list. this is to acheive the overall goal of having |
| 2448 | // horizontal d-pad navigation remain in the current item. |
Romain Guy | 304eefa | 2009-03-24 20:01:49 -0700 | [diff] [blame] | 2449 | final View globalNextFocus = FocusFinder.getInstance().findNextFocus( |
| 2450 | (ViewGroup) getRootView(), currentFocus, direction); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2451 | if (globalNextFocus != null) { |
| 2452 | return isViewAncestorOf(globalNextFocus, this); |
| 2453 | } |
| 2454 | } |
| 2455 | } |
| 2456 | return false; |
| 2457 | } |
| 2458 | |
| 2459 | /** |
| 2460 | * Scrolls to the next or previous item if possible. |
| 2461 | * |
| 2462 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 2463 | * |
| 2464 | * @return whether selection was moved |
| 2465 | */ |
| 2466 | boolean arrowScroll(int direction) { |
| 2467 | try { |
| 2468 | mInLayout = true; |
| 2469 | final boolean handled = arrowScrollImpl(direction); |
| 2470 | if (handled) { |
| 2471 | playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction)); |
| 2472 | } |
| 2473 | return handled; |
| 2474 | } finally { |
| 2475 | mInLayout = false; |
| 2476 | } |
| 2477 | } |
| 2478 | |
| 2479 | /** |
Adam Powell | 2a93911 | 2013-03-21 17:08:38 -0700 | [diff] [blame] | 2480 | * Used by {@link #arrowScrollImpl(int)} to help determine the next selected position |
Jaewan Kim | 49fc4dc | 2013-05-21 03:02:30 +0900 | [diff] [blame] | 2481 | * to move to. This return a position in the direction given if the selected item |
| 2482 | * is fully visible. |
Adam Powell | 2a93911 | 2013-03-21 17:08:38 -0700 | [diff] [blame] | 2483 | * |
Jaewan Kim | 49fc4dc | 2013-05-21 03:02:30 +0900 | [diff] [blame] | 2484 | * @param selectedView Current selected view to move from |
Adam Powell | 2a93911 | 2013-03-21 17:08:38 -0700 | [diff] [blame] | 2485 | * @param selectedPos Current selected position to move from |
| 2486 | * @param direction Direction to move in |
| 2487 | * @return Desired selected position after moving in the given direction |
| 2488 | */ |
Jaewan Kim | 49fc4dc | 2013-05-21 03:02:30 +0900 | [diff] [blame] | 2489 | private final int nextSelectedPositionForDirection( |
| 2490 | View selectedView, int selectedPos, int direction) { |
Adam Powell | 2a93911 | 2013-03-21 17:08:38 -0700 | [diff] [blame] | 2491 | int nextSelected; |
Jaewan Kim | 49fc4dc | 2013-05-21 03:02:30 +0900 | [diff] [blame] | 2492 | |
Adam Powell | 2a93911 | 2013-03-21 17:08:38 -0700 | [diff] [blame] | 2493 | if (direction == View.FOCUS_DOWN) { |
Jaewan Kim | 49fc4dc | 2013-05-21 03:02:30 +0900 | [diff] [blame] | 2494 | final int listBottom = getHeight() - mListPadding.bottom; |
| 2495 | if (selectedView != null && selectedView.getBottom() <= listBottom) { |
| 2496 | nextSelected = selectedPos != INVALID_POSITION && selectedPos >= mFirstPosition ? |
| 2497 | selectedPos + 1 : |
| 2498 | mFirstPosition; |
| 2499 | } else { |
| 2500 | return INVALID_POSITION; |
| 2501 | } |
Adam Powell | 2a93911 | 2013-03-21 17:08:38 -0700 | [diff] [blame] | 2502 | } else { |
Jaewan Kim | 49fc4dc | 2013-05-21 03:02:30 +0900 | [diff] [blame] | 2503 | final int listTop = mListPadding.top; |
| 2504 | if (selectedView != null && selectedView.getTop() >= listTop) { |
| 2505 | final int lastPos = mFirstPosition + getChildCount() - 1; |
| 2506 | nextSelected = selectedPos != INVALID_POSITION && selectedPos <= lastPos ? |
| 2507 | selectedPos - 1 : |
| 2508 | lastPos; |
| 2509 | } else { |
| 2510 | return INVALID_POSITION; |
| 2511 | } |
Adam Powell | 2a93911 | 2013-03-21 17:08:38 -0700 | [diff] [blame] | 2512 | } |
| 2513 | |
| 2514 | if (nextSelected < 0 || nextSelected >= mAdapter.getCount()) { |
| 2515 | return INVALID_POSITION; |
| 2516 | } |
| 2517 | return lookForSelectablePosition(nextSelected, direction == View.FOCUS_DOWN); |
| 2518 | } |
| 2519 | |
| 2520 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2521 | * Handle an arrow scroll going up or down. Take into account whether items are selectable, |
| 2522 | * whether there are focusable items etc. |
| 2523 | * |
| 2524 | * @param direction Either {@link android.view.View#FOCUS_UP} or {@link android.view.View#FOCUS_DOWN}. |
| 2525 | * @return Whether any scrolling, selection or focus change occured. |
| 2526 | */ |
| 2527 | private boolean arrowScrollImpl(int direction) { |
| 2528 | if (getChildCount() <= 0) { |
| 2529 | return false; |
| 2530 | } |
| 2531 | |
| 2532 | View selectedView = getSelectedView(); |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 2533 | int selectedPos = mSelectedPosition; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2534 | |
Jaewan Kim | 49fc4dc | 2013-05-21 03:02:30 +0900 | [diff] [blame] | 2535 | int nextSelectedPosition = nextSelectedPositionForDirection(selectedView, selectedPos, direction); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2536 | int amountToScroll = amountToScroll(direction, nextSelectedPosition); |
| 2537 | |
| 2538 | // if we are moving focus, we may OVERRIDE the default behavior |
| 2539 | final ArrowScrollFocusResult focusResult = mItemsCanFocus ? arrowScrollFocused(direction) : null; |
| 2540 | if (focusResult != null) { |
| 2541 | nextSelectedPosition = focusResult.getSelectedPosition(); |
| 2542 | amountToScroll = focusResult.getAmountToScroll(); |
| 2543 | } |
| 2544 | |
| 2545 | boolean needToRedraw = focusResult != null; |
| 2546 | if (nextSelectedPosition != INVALID_POSITION) { |
| 2547 | handleNewSelectionChange(selectedView, direction, nextSelectedPosition, focusResult != null); |
| 2548 | setSelectedPositionInt(nextSelectedPosition); |
| 2549 | setNextSelectedPositionInt(nextSelectedPosition); |
| 2550 | selectedView = getSelectedView(); |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 2551 | selectedPos = nextSelectedPosition; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2552 | if (mItemsCanFocus && focusResult == null) { |
| 2553 | // there was no new view found to take focus, make sure we |
| 2554 | // don't leave focus with the old selection |
| 2555 | final View focused = getFocusedChild(); |
| 2556 | if (focused != null) { |
| 2557 | focused.clearFocus(); |
| 2558 | } |
| 2559 | } |
| 2560 | needToRedraw = true; |
| 2561 | checkSelectionChanged(); |
| 2562 | } |
| 2563 | |
| 2564 | if (amountToScroll > 0) { |
| 2565 | scrollListItemsBy((direction == View.FOCUS_UP) ? amountToScroll : -amountToScroll); |
| 2566 | needToRedraw = true; |
| 2567 | } |
| 2568 | |
| 2569 | // if we didn't find a new focusable, make sure any existing focused |
| 2570 | // item that was panned off screen gives up focus. |
| 2571 | if (mItemsCanFocus && (focusResult == null) |
| 2572 | && selectedView != null && selectedView.hasFocus()) { |
| 2573 | final View focused = selectedView.findFocus(); |
Kenji Sugimoto | 827bb44 | 2014-04-10 17:46:23 +0900 | [diff] [blame] | 2574 | if (focused != null) { |
| 2575 | if (!isViewAncestorOf(focused, this) || distanceToView(focused) > 0) { |
| 2576 | focused.clearFocus(); |
| 2577 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2578 | } |
| 2579 | } |
| 2580 | |
| 2581 | // if the current selection is panned off, we need to remove the selection |
| 2582 | if (nextSelectedPosition == INVALID_POSITION && selectedView != null |
| 2583 | && !isViewAncestorOf(selectedView, this)) { |
| 2584 | selectedView = null; |
| 2585 | hideSelector(); |
| 2586 | |
| 2587 | // but we don't want to set the ressurect position (that would make subsequent |
| 2588 | // unhandled key events bring back the item we just scrolled off!) |
| 2589 | mResurrectToPosition = INVALID_POSITION; |
| 2590 | } |
| 2591 | |
| 2592 | if (needToRedraw) { |
| 2593 | if (selectedView != null) { |
Alan Viverette | de39939 | 2014-05-01 17:20:55 -0700 | [diff] [blame] | 2594 | positionSelectorLikeFocus(selectedPos, selectedView); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2595 | mSelectedTop = selectedView.getTop(); |
| 2596 | } |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 2597 | if (!awakenScrollBars()) { |
| 2598 | invalidate(); |
| 2599 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2600 | invokeOnItemScrollListener(); |
| 2601 | return true; |
| 2602 | } |
| 2603 | |
| 2604 | return false; |
| 2605 | } |
| 2606 | |
| 2607 | /** |
| 2608 | * When selection changes, it is possible that the previously selected or the |
| 2609 | * next selected item will change its size. If so, we need to offset some folks, |
| 2610 | * and re-layout the items as appropriate. |
| 2611 | * |
| 2612 | * @param selectedView The currently selected view (before changing selection). |
| 2613 | * should be <code>null</code> if there was no previous selection. |
| 2614 | * @param direction Either {@link android.view.View#FOCUS_UP} or |
| 2615 | * {@link android.view.View#FOCUS_DOWN}. |
| 2616 | * @param newSelectedPosition The position of the next selection. |
| 2617 | * @param newFocusAssigned whether new focus was assigned. This matters because |
| 2618 | * when something has focus, we don't want to show selection (ugh). |
| 2619 | */ |
| 2620 | private void handleNewSelectionChange(View selectedView, int direction, int newSelectedPosition, |
| 2621 | boolean newFocusAssigned) { |
| 2622 | if (newSelectedPosition == INVALID_POSITION) { |
| 2623 | throw new IllegalArgumentException("newSelectedPosition needs to be valid"); |
| 2624 | } |
| 2625 | |
| 2626 | // whether or not we are moving down or up, we want to preserve the |
| 2627 | // top of whatever view is on top: |
| 2628 | // - moving down: the view that had selection |
| 2629 | // - moving up: the view that is getting selection |
| 2630 | View topView; |
| 2631 | View bottomView; |
| 2632 | int topViewIndex, bottomViewIndex; |
| 2633 | boolean topSelected = false; |
| 2634 | final int selectedIndex = mSelectedPosition - mFirstPosition; |
| 2635 | final int nextSelectedIndex = newSelectedPosition - mFirstPosition; |
| 2636 | if (direction == View.FOCUS_UP) { |
| 2637 | topViewIndex = nextSelectedIndex; |
| 2638 | bottomViewIndex = selectedIndex; |
| 2639 | topView = getChildAt(topViewIndex); |
| 2640 | bottomView = selectedView; |
| 2641 | topSelected = true; |
| 2642 | } else { |
| 2643 | topViewIndex = selectedIndex; |
| 2644 | bottomViewIndex = nextSelectedIndex; |
| 2645 | topView = selectedView; |
| 2646 | bottomView = getChildAt(bottomViewIndex); |
| 2647 | } |
| 2648 | |
| 2649 | final int numChildren = getChildCount(); |
| 2650 | |
| 2651 | // start with top view: is it changing size? |
| 2652 | if (topView != null) { |
| 2653 | topView.setSelected(!newFocusAssigned && topSelected); |
| 2654 | measureAndAdjustDown(topView, topViewIndex, numChildren); |
| 2655 | } |
| 2656 | |
| 2657 | // is the bottom view changing size? |
| 2658 | if (bottomView != null) { |
| 2659 | bottomView.setSelected(!newFocusAssigned && !topSelected); |
| 2660 | measureAndAdjustDown(bottomView, bottomViewIndex, numChildren); |
| 2661 | } |
| 2662 | } |
| 2663 | |
| 2664 | /** |
| 2665 | * Re-measure a child, and if its height changes, lay it out preserving its |
| 2666 | * top, and adjust the children below it appropriately. |
| 2667 | * @param child The child |
| 2668 | * @param childIndex The view group index of the child. |
| 2669 | * @param numChildren The number of children in the view group. |
| 2670 | */ |
| 2671 | private void measureAndAdjustDown(View child, int childIndex, int numChildren) { |
| 2672 | int oldHeight = child.getHeight(); |
| 2673 | measureItem(child); |
| 2674 | if (child.getMeasuredHeight() != oldHeight) { |
| 2675 | // lay out the view, preserving its top |
| 2676 | relayoutMeasuredItem(child); |
| 2677 | |
| 2678 | // adjust views below appropriately |
| 2679 | final int heightDelta = child.getMeasuredHeight() - oldHeight; |
| 2680 | for (int i = childIndex + 1; i < numChildren; i++) { |
| 2681 | getChildAt(i).offsetTopAndBottom(heightDelta); |
| 2682 | } |
| 2683 | } |
| 2684 | } |
| 2685 | |
| 2686 | /** |
| 2687 | * Measure a particular list child. |
| 2688 | * TODO: unify with setUpChild. |
| 2689 | * @param child The child. |
| 2690 | */ |
| 2691 | private void measureItem(View child) { |
| 2692 | ViewGroup.LayoutParams p = child.getLayoutParams(); |
| 2693 | if (p == null) { |
| 2694 | p = new ViewGroup.LayoutParams( |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 2695 | ViewGroup.LayoutParams.MATCH_PARENT, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2696 | ViewGroup.LayoutParams.WRAP_CONTENT); |
| 2697 | } |
| 2698 | |
| 2699 | int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec, |
| 2700 | mListPadding.left + mListPadding.right, p.width); |
| 2701 | int lpHeight = p.height; |
| 2702 | int childHeightSpec; |
| 2703 | if (lpHeight > 0) { |
| 2704 | childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY); |
| 2705 | } else { |
Adam Powell | d5dbf4b | 2015-06-11 13:19:24 -0700 | [diff] [blame] | 2706 | childHeightSpec = MeasureSpec.makeSafeMeasureSpec(getMeasuredHeight(), |
Filip Gruszczynski | b6824bf | 2015-04-13 09:16:25 -0700 | [diff] [blame] | 2707 | MeasureSpec.UNSPECIFIED); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2708 | } |
| 2709 | child.measure(childWidthSpec, childHeightSpec); |
| 2710 | } |
| 2711 | |
| 2712 | /** |
| 2713 | * Layout a child that has been measured, preserving its top position. |
| 2714 | * TODO: unify with setUpChild. |
| 2715 | * @param child The child. |
| 2716 | */ |
| 2717 | private void relayoutMeasuredItem(View child) { |
| 2718 | final int w = child.getMeasuredWidth(); |
| 2719 | final int h = child.getMeasuredHeight(); |
| 2720 | final int childLeft = mListPadding.left; |
| 2721 | final int childRight = childLeft + w; |
| 2722 | final int childTop = child.getTop(); |
| 2723 | final int childBottom = childTop + h; |
| 2724 | child.layout(childLeft, childTop, childRight, childBottom); |
| 2725 | } |
| 2726 | |
| 2727 | /** |
| 2728 | * @return The amount to preview next items when arrow srolling. |
| 2729 | */ |
| 2730 | private int getArrowScrollPreviewLength() { |
| 2731 | return Math.max(MIN_SCROLL_PREVIEW_PIXELS, getVerticalFadingEdgeLength()); |
| 2732 | } |
| 2733 | |
| 2734 | /** |
| 2735 | * Determine how much we need to scroll in order to get the next selected view |
| 2736 | * visible, with a fading edge showing below as applicable. The amount is |
| 2737 | * capped at {@link #getMaxScrollAmount()} . |
| 2738 | * |
| 2739 | * @param direction either {@link android.view.View#FOCUS_UP} or |
| 2740 | * {@link android.view.View#FOCUS_DOWN}. |
| 2741 | * @param nextSelectedPosition The position of the next selection, or |
| 2742 | * {@link #INVALID_POSITION} if there is no next selectable position |
| 2743 | * @return The amount to scroll. Note: this is always positive! Direction |
| 2744 | * needs to be taken into account when actually scrolling. |
| 2745 | */ |
| 2746 | private int amountToScroll(int direction, int nextSelectedPosition) { |
| 2747 | final int listBottom = getHeight() - mListPadding.bottom; |
| 2748 | final int listTop = mListPadding.top; |
| 2749 | |
Justin Ho | 1ad11b9 | 2013-02-25 16:09:20 -0800 | [diff] [blame] | 2750 | int numChildren = getChildCount(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2751 | |
| 2752 | if (direction == View.FOCUS_DOWN) { |
| 2753 | int indexToMakeVisible = numChildren - 1; |
| 2754 | if (nextSelectedPosition != INVALID_POSITION) { |
| 2755 | indexToMakeVisible = nextSelectedPosition - mFirstPosition; |
| 2756 | } |
Justin Ho | 1ad11b9 | 2013-02-25 16:09:20 -0800 | [diff] [blame] | 2757 | while (numChildren <= indexToMakeVisible) { |
| 2758 | // Child to view is not attached yet. |
| 2759 | addViewBelow(getChildAt(numChildren - 1), mFirstPosition + numChildren - 1); |
| 2760 | numChildren++; |
| 2761 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2762 | final int positionToMakeVisible = mFirstPosition + indexToMakeVisible; |
| 2763 | final View viewToMakeVisible = getChildAt(indexToMakeVisible); |
| 2764 | |
| 2765 | int goalBottom = listBottom; |
| 2766 | if (positionToMakeVisible < mItemCount - 1) { |
| 2767 | goalBottom -= getArrowScrollPreviewLength(); |
| 2768 | } |
| 2769 | |
| 2770 | if (viewToMakeVisible.getBottom() <= goalBottom) { |
| 2771 | // item is fully visible. |
| 2772 | return 0; |
| 2773 | } |
| 2774 | |
| 2775 | if (nextSelectedPosition != INVALID_POSITION |
| 2776 | && (goalBottom - viewToMakeVisible.getTop()) >= getMaxScrollAmount()) { |
| 2777 | // item already has enough of it visible, changing selection is good enough |
| 2778 | return 0; |
| 2779 | } |
| 2780 | |
| 2781 | int amountToScroll = (viewToMakeVisible.getBottom() - goalBottom); |
| 2782 | |
| 2783 | if ((mFirstPosition + numChildren) == mItemCount) { |
| 2784 | // last is last in list -> make sure we don't scroll past it |
| 2785 | final int max = getChildAt(numChildren - 1).getBottom() - listBottom; |
| 2786 | amountToScroll = Math.min(amountToScroll, max); |
| 2787 | } |
| 2788 | |
| 2789 | return Math.min(amountToScroll, getMaxScrollAmount()); |
| 2790 | } else { |
| 2791 | int indexToMakeVisible = 0; |
| 2792 | if (nextSelectedPosition != INVALID_POSITION) { |
| 2793 | indexToMakeVisible = nextSelectedPosition - mFirstPosition; |
| 2794 | } |
Justin Ho | 1ad11b9 | 2013-02-25 16:09:20 -0800 | [diff] [blame] | 2795 | while (indexToMakeVisible < 0) { |
| 2796 | // Child to view is not attached yet. |
| 2797 | addViewAbove(getChildAt(0), mFirstPosition); |
| 2798 | mFirstPosition--; |
| 2799 | indexToMakeVisible = nextSelectedPosition - mFirstPosition; |
| 2800 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2801 | final int positionToMakeVisible = mFirstPosition + indexToMakeVisible; |
| 2802 | final View viewToMakeVisible = getChildAt(indexToMakeVisible); |
| 2803 | int goalTop = listTop; |
| 2804 | if (positionToMakeVisible > 0) { |
| 2805 | goalTop += getArrowScrollPreviewLength(); |
| 2806 | } |
| 2807 | if (viewToMakeVisible.getTop() >= goalTop) { |
| 2808 | // item is fully visible. |
| 2809 | return 0; |
| 2810 | } |
| 2811 | |
| 2812 | if (nextSelectedPosition != INVALID_POSITION && |
| 2813 | (viewToMakeVisible.getBottom() - goalTop) >= getMaxScrollAmount()) { |
| 2814 | // item already has enough of it visible, changing selection is good enough |
| 2815 | return 0; |
| 2816 | } |
| 2817 | |
| 2818 | int amountToScroll = (goalTop - viewToMakeVisible.getTop()); |
| 2819 | if (mFirstPosition == 0) { |
| 2820 | // first is first in list -> make sure we don't scroll past it |
| 2821 | final int max = listTop - getChildAt(0).getTop(); |
| 2822 | amountToScroll = Math.min(amountToScroll, max); |
| 2823 | } |
| 2824 | return Math.min(amountToScroll, getMaxScrollAmount()); |
| 2825 | } |
| 2826 | } |
| 2827 | |
| 2828 | /** |
| 2829 | * Holds results of focus aware arrow scrolling. |
| 2830 | */ |
| 2831 | static private class ArrowScrollFocusResult { |
| 2832 | private int mSelectedPosition; |
| 2833 | private int mAmountToScroll; |
| 2834 | |
| 2835 | /** |
| 2836 | * How {@link android.widget.ListView#arrowScrollFocused} returns its values. |
| 2837 | */ |
| 2838 | void populate(int selectedPosition, int amountToScroll) { |
| 2839 | mSelectedPosition = selectedPosition; |
| 2840 | mAmountToScroll = amountToScroll; |
| 2841 | } |
| 2842 | |
| 2843 | public int getSelectedPosition() { |
| 2844 | return mSelectedPosition; |
| 2845 | } |
| 2846 | |
| 2847 | public int getAmountToScroll() { |
| 2848 | return mAmountToScroll; |
| 2849 | } |
| 2850 | } |
| 2851 | |
| 2852 | /** |
| 2853 | * @param direction either {@link android.view.View#FOCUS_UP} or |
| 2854 | * {@link android.view.View#FOCUS_DOWN}. |
| 2855 | * @return The position of the next selectable position of the views that |
| 2856 | * are currently visible, taking into account the fact that there might |
| 2857 | * be no selection. Returns {@link #INVALID_POSITION} if there is no |
| 2858 | * selectable view on screen in the given direction. |
| 2859 | */ |
| 2860 | private int lookForSelectablePositionOnScreen(int direction) { |
| 2861 | final int firstPosition = mFirstPosition; |
| 2862 | if (direction == View.FOCUS_DOWN) { |
| 2863 | int startPos = (mSelectedPosition != INVALID_POSITION) ? |
| 2864 | mSelectedPosition + 1 : |
| 2865 | firstPosition; |
| 2866 | if (startPos >= mAdapter.getCount()) { |
| 2867 | return INVALID_POSITION; |
| 2868 | } |
| 2869 | if (startPos < firstPosition) { |
| 2870 | startPos = firstPosition; |
| 2871 | } |
| 2872 | |
| 2873 | final int lastVisiblePos = getLastVisiblePosition(); |
| 2874 | final ListAdapter adapter = getAdapter(); |
| 2875 | for (int pos = startPos; pos <= lastVisiblePos; pos++) { |
| 2876 | if (adapter.isEnabled(pos) |
| 2877 | && getChildAt(pos - firstPosition).getVisibility() == View.VISIBLE) { |
| 2878 | return pos; |
| 2879 | } |
| 2880 | } |
| 2881 | } else { |
| 2882 | int last = firstPosition + getChildCount() - 1; |
| 2883 | int startPos = (mSelectedPosition != INVALID_POSITION) ? |
| 2884 | mSelectedPosition - 1 : |
| 2885 | firstPosition + getChildCount() - 1; |
Dianne Hackborn | 5d9d03a | 2011-01-24 13:15:09 -0800 | [diff] [blame] | 2886 | if (startPos < 0 || startPos >= mAdapter.getCount()) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2887 | return INVALID_POSITION; |
| 2888 | } |
| 2889 | if (startPos > last) { |
| 2890 | startPos = last; |
| 2891 | } |
| 2892 | |
| 2893 | final ListAdapter adapter = getAdapter(); |
| 2894 | for (int pos = startPos; pos >= firstPosition; pos--) { |
| 2895 | if (adapter.isEnabled(pos) |
| 2896 | && getChildAt(pos - firstPosition).getVisibility() == View.VISIBLE) { |
| 2897 | return pos; |
| 2898 | } |
| 2899 | } |
| 2900 | } |
| 2901 | return INVALID_POSITION; |
| 2902 | } |
| 2903 | |
| 2904 | /** |
| 2905 | * Do an arrow scroll based on focus searching. If a new view is |
| 2906 | * given focus, return the selection delta and amount to scroll via |
| 2907 | * an {@link ArrowScrollFocusResult}, otherwise, return null. |
| 2908 | * |
| 2909 | * @param direction either {@link android.view.View#FOCUS_UP} or |
| 2910 | * {@link android.view.View#FOCUS_DOWN}. |
| 2911 | * @return The result if focus has changed, or <code>null</code>. |
| 2912 | */ |
| 2913 | private ArrowScrollFocusResult arrowScrollFocused(final int direction) { |
| 2914 | final View selectedView = getSelectedView(); |
| 2915 | View newFocus; |
| 2916 | if (selectedView != null && selectedView.hasFocus()) { |
| 2917 | View oldFocus = selectedView.findFocus(); |
| 2918 | newFocus = FocusFinder.getInstance().findNextFocus(this, oldFocus, direction); |
| 2919 | } else { |
| 2920 | if (direction == View.FOCUS_DOWN) { |
| 2921 | final boolean topFadingEdgeShowing = (mFirstPosition > 0); |
| 2922 | final int listTop = mListPadding.top + |
| 2923 | (topFadingEdgeShowing ? getArrowScrollPreviewLength() : 0); |
| 2924 | final int ySearchPoint = |
| 2925 | (selectedView != null && selectedView.getTop() > listTop) ? |
| 2926 | selectedView.getTop() : |
| 2927 | listTop; |
| 2928 | mTempRect.set(0, ySearchPoint, 0, ySearchPoint); |
| 2929 | } else { |
| 2930 | final boolean bottomFadingEdgeShowing = |
| 2931 | (mFirstPosition + getChildCount() - 1) < mItemCount; |
| 2932 | final int listBottom = getHeight() - mListPadding.bottom - |
| 2933 | (bottomFadingEdgeShowing ? getArrowScrollPreviewLength() : 0); |
| 2934 | final int ySearchPoint = |
| 2935 | (selectedView != null && selectedView.getBottom() < listBottom) ? |
| 2936 | selectedView.getBottom() : |
| 2937 | listBottom; |
| 2938 | mTempRect.set(0, ySearchPoint, 0, ySearchPoint); |
| 2939 | } |
| 2940 | newFocus = FocusFinder.getInstance().findNextFocusFromRect(this, mTempRect, direction); |
| 2941 | } |
| 2942 | |
| 2943 | if (newFocus != null) { |
| 2944 | final int positionOfNewFocus = positionOfNewFocus(newFocus); |
| 2945 | |
| 2946 | // if the focus change is in a different new position, make sure |
| 2947 | // we aren't jumping over another selectable position |
| 2948 | if (mSelectedPosition != INVALID_POSITION && positionOfNewFocus != mSelectedPosition) { |
| 2949 | final int selectablePosition = lookForSelectablePositionOnScreen(direction); |
| 2950 | if (selectablePosition != INVALID_POSITION && |
| 2951 | ((direction == View.FOCUS_DOWN && selectablePosition < positionOfNewFocus) || |
| 2952 | (direction == View.FOCUS_UP && selectablePosition > positionOfNewFocus))) { |
| 2953 | return null; |
| 2954 | } |
| 2955 | } |
| 2956 | |
| 2957 | int focusScroll = amountToScrollToNewFocus(direction, newFocus, positionOfNewFocus); |
| 2958 | |
| 2959 | final int maxScrollAmount = getMaxScrollAmount(); |
| 2960 | if (focusScroll < maxScrollAmount) { |
| 2961 | // not moving too far, safe to give next view focus |
| 2962 | newFocus.requestFocus(direction); |
| 2963 | mArrowScrollFocusResult.populate(positionOfNewFocus, focusScroll); |
| 2964 | return mArrowScrollFocusResult; |
| 2965 | } else if (distanceToView(newFocus) < maxScrollAmount){ |
| 2966 | // Case to consider: |
| 2967 | // too far to get entire next focusable on screen, but by going |
| 2968 | // max scroll amount, we are getting it at least partially in view, |
| 2969 | // so give it focus and scroll the max ammount. |
| 2970 | newFocus.requestFocus(direction); |
| 2971 | mArrowScrollFocusResult.populate(positionOfNewFocus, maxScrollAmount); |
| 2972 | return mArrowScrollFocusResult; |
| 2973 | } |
| 2974 | } |
| 2975 | return null; |
| 2976 | } |
| 2977 | |
| 2978 | /** |
| 2979 | * @param newFocus The view that would have focus. |
| 2980 | * @return the position that contains newFocus |
| 2981 | */ |
| 2982 | private int positionOfNewFocus(View newFocus) { |
| 2983 | final int numChildren = getChildCount(); |
| 2984 | for (int i = 0; i < numChildren; i++) { |
| 2985 | final View child = getChildAt(i); |
| 2986 | if (isViewAncestorOf(newFocus, child)) { |
| 2987 | return mFirstPosition + i; |
| 2988 | } |
| 2989 | } |
| 2990 | throw new IllegalArgumentException("newFocus is not a child of any of the" |
| 2991 | + " children of the list!"); |
| 2992 | } |
| 2993 | |
| 2994 | /** |
| 2995 | * Return true if child is an ancestor of parent, (or equal to the parent). |
| 2996 | */ |
| 2997 | private boolean isViewAncestorOf(View child, View parent) { |
| 2998 | if (child == parent) { |
| 2999 | return true; |
| 3000 | } |
| 3001 | |
| 3002 | final ViewParent theParent = child.getParent(); |
| 3003 | return (theParent instanceof ViewGroup) && isViewAncestorOf((View) theParent, parent); |
| 3004 | } |
| 3005 | |
| 3006 | /** |
| 3007 | * Determine how much we need to scroll in order to get newFocus in view. |
| 3008 | * @param direction either {@link android.view.View#FOCUS_UP} or |
| 3009 | * {@link android.view.View#FOCUS_DOWN}. |
| 3010 | * @param newFocus The view that would take focus. |
| 3011 | * @param positionOfNewFocus The position of the list item containing newFocus |
| 3012 | * @return The amount to scroll. Note: this is always positive! Direction |
| 3013 | * needs to be taken into account when actually scrolling. |
| 3014 | */ |
| 3015 | private int amountToScrollToNewFocus(int direction, View newFocus, int positionOfNewFocus) { |
| 3016 | int amountToScroll = 0; |
| 3017 | newFocus.getDrawingRect(mTempRect); |
| 3018 | offsetDescendantRectToMyCoords(newFocus, mTempRect); |
| 3019 | if (direction == View.FOCUS_UP) { |
| 3020 | if (mTempRect.top < mListPadding.top) { |
| 3021 | amountToScroll = mListPadding.top - mTempRect.top; |
| 3022 | if (positionOfNewFocus > 0) { |
| 3023 | amountToScroll += getArrowScrollPreviewLength(); |
| 3024 | } |
| 3025 | } |
| 3026 | } else { |
| 3027 | final int listBottom = getHeight() - mListPadding.bottom; |
| 3028 | if (mTempRect.bottom > listBottom) { |
| 3029 | amountToScroll = mTempRect.bottom - listBottom; |
| 3030 | if (positionOfNewFocus < mItemCount - 1) { |
| 3031 | amountToScroll += getArrowScrollPreviewLength(); |
| 3032 | } |
| 3033 | } |
| 3034 | } |
| 3035 | return amountToScroll; |
| 3036 | } |
| 3037 | |
| 3038 | /** |
| 3039 | * Determine the distance to the nearest edge of a view in a particular |
Gilles Debunne | fd3ddfa | 2010-02-17 16:59:20 -0800 | [diff] [blame] | 3040 | * direction. |
| 3041 | * |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3042 | * @param descendant A descendant of this list. |
| 3043 | * @return The distance, or 0 if the nearest edge is already on screen. |
| 3044 | */ |
| 3045 | private int distanceToView(View descendant) { |
| 3046 | int distance = 0; |
| 3047 | descendant.getDrawingRect(mTempRect); |
| 3048 | offsetDescendantRectToMyCoords(descendant, mTempRect); |
| 3049 | final int listBottom = mBottom - mTop - mListPadding.bottom; |
| 3050 | if (mTempRect.bottom < mListPadding.top) { |
| 3051 | distance = mListPadding.top - mTempRect.bottom; |
| 3052 | } else if (mTempRect.top > listBottom) { |
| 3053 | distance = mTempRect.top - listBottom; |
| 3054 | } |
| 3055 | return distance; |
| 3056 | } |
| 3057 | |
| 3058 | |
| 3059 | /** |
| 3060 | * Scroll the children by amount, adding a view at the end and removing |
| 3061 | * views that fall off as necessary. |
| 3062 | * |
| 3063 | * @param amount The amount (positive or negative) to scroll. |
| 3064 | */ |
| 3065 | private void scrollListItemsBy(int amount) { |
| 3066 | offsetChildrenTopAndBottom(amount); |
| 3067 | |
| 3068 | final int listBottom = getHeight() - mListPadding.bottom; |
| 3069 | final int listTop = mListPadding.top; |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 3070 | final AbsListView.RecycleBin recycleBin = mRecycler; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3071 | |
| 3072 | if (amount < 0) { |
| 3073 | // shifted items up |
| 3074 | |
| 3075 | // may need to pan views into the bottom space |
| 3076 | int numChildren = getChildCount(); |
| 3077 | View last = getChildAt(numChildren - 1); |
| 3078 | while (last.getBottom() < listBottom) { |
| 3079 | final int lastVisiblePosition = mFirstPosition + numChildren - 1; |
| 3080 | if (lastVisiblePosition < mItemCount - 1) { |
| 3081 | last = addViewBelow(last, lastVisiblePosition); |
| 3082 | numChildren++; |
| 3083 | } else { |
| 3084 | break; |
| 3085 | } |
| 3086 | } |
| 3087 | |
| 3088 | // may have brought in the last child of the list that is skinnier |
| 3089 | // than the fading edge, thereby leaving space at the end. need |
| 3090 | // to shift back |
| 3091 | if (last.getBottom() < listBottom) { |
| 3092 | offsetChildrenTopAndBottom(listBottom - last.getBottom()); |
| 3093 | } |
| 3094 | |
| 3095 | // top views may be panned off screen |
| 3096 | View first = getChildAt(0); |
| 3097 | while (first.getBottom() < listTop) { |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 3098 | AbsListView.LayoutParams layoutParams = (LayoutParams) first.getLayoutParams(); |
| 3099 | if (recycleBin.shouldRecycleViewType(layoutParams.viewType)) { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 3100 | recycleBin.addScrapView(first, mFirstPosition); |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 3101 | } |
Mattias Niklewski | 158d6b7 | 2011-02-02 15:52:37 +0100 | [diff] [blame] | 3102 | detachViewFromParent(first); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3103 | first = getChildAt(0); |
| 3104 | mFirstPosition++; |
| 3105 | } |
| 3106 | } else { |
| 3107 | // shifted items down |
| 3108 | View first = getChildAt(0); |
| 3109 | |
| 3110 | // may need to pan views into top |
| 3111 | while ((first.getTop() > listTop) && (mFirstPosition > 0)) { |
| 3112 | first = addViewAbove(first, mFirstPosition); |
| 3113 | mFirstPosition--; |
| 3114 | } |
| 3115 | |
| 3116 | // may have brought the very first child of the list in too far and |
| 3117 | // need to shift it back |
| 3118 | if (first.getTop() > listTop) { |
| 3119 | offsetChildrenTopAndBottom(listTop - first.getTop()); |
| 3120 | } |
| 3121 | |
| 3122 | int lastIndex = getChildCount() - 1; |
| 3123 | View last = getChildAt(lastIndex); |
| 3124 | |
| 3125 | // bottom view may be panned off screen |
| 3126 | while (last.getTop() > listBottom) { |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 3127 | AbsListView.LayoutParams layoutParams = (LayoutParams) last.getLayoutParams(); |
| 3128 | if (recycleBin.shouldRecycleViewType(layoutParams.viewType)) { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 3129 | recycleBin.addScrapView(last, mFirstPosition+lastIndex); |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 3130 | } |
Mattias Niklewski | 158d6b7 | 2011-02-02 15:52:37 +0100 | [diff] [blame] | 3131 | detachViewFromParent(last); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3132 | last = getChildAt(--lastIndex); |
| 3133 | } |
| 3134 | } |
| 3135 | } |
| 3136 | |
| 3137 | private View addViewAbove(View theView, int position) { |
| 3138 | int abovePosition = position - 1; |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 3139 | View view = obtainView(abovePosition, mIsScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3140 | int edgeOfNewChild = theView.getTop() - mDividerHeight; |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 3141 | setupChild(view, abovePosition, edgeOfNewChild, false, mListPadding.left, |
| 3142 | false, mIsScrap[0]); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3143 | return view; |
| 3144 | } |
| 3145 | |
| 3146 | private View addViewBelow(View theView, int position) { |
| 3147 | int belowPosition = position + 1; |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 3148 | View view = obtainView(belowPosition, mIsScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3149 | int edgeOfNewChild = theView.getBottom() + mDividerHeight; |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 3150 | setupChild(view, belowPosition, edgeOfNewChild, true, mListPadding.left, |
| 3151 | false, mIsScrap[0]); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3152 | return view; |
| 3153 | } |
| 3154 | |
| 3155 | /** |
| 3156 | * Indicates that the views created by the ListAdapter can contain focusable |
| 3157 | * items. |
| 3158 | * |
| 3159 | * @param itemsCanFocus true if items can get focus, false otherwise |
| 3160 | */ |
| 3161 | public void setItemsCanFocus(boolean itemsCanFocus) { |
| 3162 | mItemsCanFocus = itemsCanFocus; |
| 3163 | if (!itemsCanFocus) { |
| 3164 | setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS); |
| 3165 | } |
| 3166 | } |
| 3167 | |
| 3168 | /** |
| 3169 | * @return Whether the views created by the ListAdapter can contain focusable |
| 3170 | * items. |
| 3171 | */ |
| 3172 | public boolean getItemsCanFocus() { |
| 3173 | return mItemsCanFocus; |
| 3174 | } |
| 3175 | |
| 3176 | @Override |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 3177 | public boolean isOpaque() { |
Chet Haase | 7840055 | 2011-03-03 08:18:17 -0800 | [diff] [blame] | 3178 | boolean retValue = (mCachingActive && mIsCacheColorOpaque && mDividerIsOpaque && |
Romain Guy | 8f1344f5 | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 3179 | hasOpaqueScrollbars()) || super.isOpaque(); |
Chet Haase | 7840055 | 2011-03-03 08:18:17 -0800 | [diff] [blame] | 3180 | if (retValue) { |
| 3181 | // only return true if the list items cover the entire area of the view |
Adam Powell | 3ba8f5d6 | 2011-03-07 15:36:33 -0800 | [diff] [blame] | 3182 | final int listTop = mListPadding != null ? mListPadding.top : mPaddingTop; |
Chet Haase | 7840055 | 2011-03-03 08:18:17 -0800 | [diff] [blame] | 3183 | View first = getChildAt(0); |
| 3184 | if (first == null || first.getTop() > listTop) { |
| 3185 | return false; |
| 3186 | } |
Adam Powell | 3ba8f5d6 | 2011-03-07 15:36:33 -0800 | [diff] [blame] | 3187 | final int listBottom = getHeight() - |
| 3188 | (mListPadding != null ? mListPadding.bottom : mPaddingBottom); |
Chet Haase | 7840055 | 2011-03-03 08:18:17 -0800 | [diff] [blame] | 3189 | View last = getChildAt(getChildCount() - 1); |
| 3190 | if (last == null || last.getBottom() < listBottom) { |
| 3191 | return false; |
| 3192 | } |
| 3193 | } |
| 3194 | return retValue; |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 3195 | } |
| 3196 | |
| 3197 | @Override |
| 3198 | public void setCacheColorHint(int color) { |
Romain Guy | 8f1344f5 | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 3199 | final boolean opaque = (color >>> 24) == 0xFF; |
| 3200 | mIsCacheColorOpaque = opaque; |
| 3201 | if (opaque) { |
Romain Guy | a02903f | 2009-05-23 13:26:46 -0700 | [diff] [blame] | 3202 | if (mDividerPaint == null) { |
| 3203 | mDividerPaint = new Paint(); |
| 3204 | } |
Romain Guy | 8f1344f5 | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 3205 | mDividerPaint.setColor(color); |
| 3206 | } |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 3207 | super.setCacheColorHint(color); |
| 3208 | } |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3209 | |
| 3210 | void drawOverscrollHeader(Canvas canvas, Drawable drawable, Rect bounds) { |
| 3211 | final int height = drawable.getMinimumHeight(); |
| 3212 | |
| 3213 | canvas.save(); |
| 3214 | canvas.clipRect(bounds); |
| 3215 | |
| 3216 | final int span = bounds.bottom - bounds.top; |
| 3217 | if (span < height) { |
| 3218 | bounds.top = bounds.bottom - height; |
| 3219 | } |
| 3220 | |
| 3221 | drawable.setBounds(bounds); |
| 3222 | drawable.draw(canvas); |
| 3223 | |
| 3224 | canvas.restore(); |
| 3225 | } |
| 3226 | |
| 3227 | void drawOverscrollFooter(Canvas canvas, Drawable drawable, Rect bounds) { |
| 3228 | final int height = drawable.getMinimumHeight(); |
| 3229 | |
| 3230 | canvas.save(); |
| 3231 | canvas.clipRect(bounds); |
| 3232 | |
| 3233 | final int span = bounds.bottom - bounds.top; |
| 3234 | if (span < height) { |
| 3235 | bounds.bottom = bounds.top + height; |
| 3236 | } |
| 3237 | |
| 3238 | drawable.setBounds(bounds); |
| 3239 | drawable.draw(canvas); |
| 3240 | |
| 3241 | canvas.restore(); |
| 3242 | } |
| 3243 | |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 3244 | @Override |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3245 | protected void dispatchDraw(Canvas canvas) { |
Romain Guy | 0211a0a | 2011-02-14 16:34:59 -0800 | [diff] [blame] | 3246 | if (mCachingStarted) { |
| 3247 | mCachingActive = true; |
| 3248 | } |
| 3249 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3250 | // Draw the dividers |
| 3251 | final int dividerHeight = mDividerHeight; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3252 | final Drawable overscrollHeader = mOverScrollHeader; |
| 3253 | final Drawable overscrollFooter = mOverScrollFooter; |
| 3254 | final boolean drawOverscrollHeader = overscrollHeader != null; |
| 3255 | final boolean drawOverscrollFooter = overscrollFooter != null; |
Adam Powell | bfb5d4b | 2010-03-10 18:55:25 -0800 | [diff] [blame] | 3256 | final boolean drawDividers = dividerHeight > 0 && mDivider != null; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3257 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3258 | if (drawDividers || drawOverscrollHeader || drawOverscrollFooter) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3259 | // Only modify the top and bottom in the loop, we set the left and right here |
| 3260 | final Rect bounds = mTempRect; |
| 3261 | bounds.left = mPaddingLeft; |
| 3262 | bounds.right = mRight - mLeft - mPaddingRight; |
| 3263 | |
| 3264 | final int count = getChildCount(); |
| 3265 | final int headerCount = mHeaderViewInfos.size(); |
Adam Powell | bfb5d4b | 2010-03-10 18:55:25 -0800 | [diff] [blame] | 3266 | final int itemCount = mItemCount; |
Alan Viverette | b9fc4b8 | 2013-06-03 16:42:22 -0700 | [diff] [blame] | 3267 | final int footerLimit = (itemCount - mFooterViewInfos.size()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3268 | final boolean headerDividers = mHeaderDividersEnabled; |
| 3269 | final boolean footerDividers = mFooterDividersEnabled; |
| 3270 | final int first = mFirstPosition; |
Romain Guy | 2bed227 | 2009-03-24 18:23:21 -0700 | [diff] [blame] | 3271 | final boolean areAllItemsSelectable = mAreAllItemsSelectable; |
| 3272 | final ListAdapter adapter = mAdapter; |
Romain Guy | e32edc6 | 2009-05-29 10:33:36 -0700 | [diff] [blame] | 3273 | // If the list is opaque *and* the background is not, we want to |
| 3274 | // fill a rect where the dividers would be for non-selectable items |
| 3275 | // If the list is opaque and the background is also opaque, we don't |
| 3276 | // need to draw anything since the background will do it for us |
Romain Guy | 179de8a | 2010-07-09 13:27:00 -0700 | [diff] [blame] | 3277 | final boolean fillForMissingDividers = isOpaque() && !super.isOpaque(); |
Romain Guy | e32edc6 | 2009-05-29 10:33:36 -0700 | [diff] [blame] | 3278 | |
| 3279 | if (fillForMissingDividers && mDividerPaint == null && mIsCacheColorOpaque) { |
Romain Guy | a02903f | 2009-05-23 13:26:46 -0700 | [diff] [blame] | 3280 | mDividerPaint = new Paint(); |
Romain Guy | e32edc6 | 2009-05-29 10:33:36 -0700 | [diff] [blame] | 3281 | mDividerPaint.setColor(getCacheColorHint()); |
Romain Guy | a02903f | 2009-05-23 13:26:46 -0700 | [diff] [blame] | 3282 | } |
Romain Guy | 8f1344f5 | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 3283 | final Paint paint = mDividerPaint; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3284 | |
Adam Powell | 9456655 | 2011-01-05 23:25:33 -0800 | [diff] [blame] | 3285 | int effectivePaddingTop = 0; |
| 3286 | int effectivePaddingBottom = 0; |
| 3287 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 3288 | effectivePaddingTop = mListPadding.top; |
| 3289 | effectivePaddingBottom = mListPadding.bottom; |
| 3290 | } |
| 3291 | |
| 3292 | final int listBottom = mBottom - mTop - effectivePaddingBottom + mScrollY; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3293 | if (!mStackFromBottom) { |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3294 | int bottom = 0; |
Adam Powell | 0b8bb42 | 2010-02-08 14:30:45 -0800 | [diff] [blame] | 3295 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3296 | // Draw top divider or header for overscroll |
| 3297 | final int scrollY = mScrollY; |
| 3298 | if (count > 0 && scrollY < 0) { |
| 3299 | if (drawOverscrollHeader) { |
| 3300 | bounds.bottom = 0; |
| 3301 | bounds.top = scrollY; |
| 3302 | drawOverscrollHeader(canvas, overscrollHeader, bounds); |
| 3303 | } else if (drawDividers) { |
| 3304 | bounds.bottom = 0; |
| 3305 | bounds.top = -dividerHeight; |
| 3306 | drawDivider(canvas, bounds, -1); |
| 3307 | } |
| 3308 | } |
| 3309 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3310 | for (int i = 0; i < count; i++) { |
Alan Viverette | b9fc4b8 | 2013-06-03 16:42:22 -0700 | [diff] [blame] | 3311 | final int itemIndex = (first + i); |
| 3312 | final boolean isHeader = (itemIndex < headerCount); |
| 3313 | final boolean isFooter = (itemIndex >= footerLimit); |
| 3314 | if ((headerDividers || !isHeader) && (footerDividers || !isFooter)) { |
| 3315 | final View child = getChildAt(i); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3316 | bottom = child.getBottom(); |
Alan Viverette | b9fc4b8 | 2013-06-03 16:42:22 -0700 | [diff] [blame] | 3317 | final boolean isLastItem = (i == (count - 1)); |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3318 | |
Alan Viverette | b9fc4b8 | 2013-06-03 16:42:22 -0700 | [diff] [blame] | 3319 | if (drawDividers && (bottom < listBottom) |
| 3320 | && !(drawOverscrollFooter && isLastItem)) { |
| 3321 | final int nextIndex = (itemIndex + 1); |
Alan Viverette | 20cc605 | 2013-11-15 15:56:38 -0800 | [diff] [blame] | 3322 | // Draw dividers between enabled items, headers |
| 3323 | // and/or footers when enabled and requested, and |
| 3324 | // after the last enabled item. |
| 3325 | if (adapter.isEnabled(itemIndex) && (headerDividers || !isHeader |
| 3326 | && (nextIndex >= headerCount)) && (isLastItem |
| 3327 | || adapter.isEnabled(nextIndex) && (footerDividers || !isFooter |
| 3328 | && (nextIndex < footerLimit)))) { |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3329 | bounds.top = bottom; |
| 3330 | bounds.bottom = bottom + dividerHeight; |
| 3331 | drawDivider(canvas, bounds, i); |
| 3332 | } else if (fillForMissingDividers) { |
| 3333 | bounds.top = bottom; |
| 3334 | bounds.bottom = bottom + dividerHeight; |
| 3335 | canvas.drawRect(bounds, paint); |
| 3336 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3337 | } |
| 3338 | } |
| 3339 | } |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3340 | |
| 3341 | final int overFooterBottom = mBottom + mScrollY; |
| 3342 | if (drawOverscrollFooter && first + count == itemCount && |
| 3343 | overFooterBottom > bottom) { |
| 3344 | bounds.top = bottom; |
| 3345 | bounds.bottom = overFooterBottom; |
| 3346 | drawOverscrollFooter(canvas, overscrollFooter, bounds); |
| 3347 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3348 | } else { |
| 3349 | int top; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3350 | |
Adam Powell | bfb5d4b | 2010-03-10 18:55:25 -0800 | [diff] [blame] | 3351 | final int scrollY = mScrollY; |
Adam Powell | bfb5d4b | 2010-03-10 18:55:25 -0800 | [diff] [blame] | 3352 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3353 | if (count > 0 && drawOverscrollHeader) { |
| 3354 | bounds.top = scrollY; |
| 3355 | bounds.bottom = getChildAt(0).getTop(); |
| 3356 | drawOverscrollHeader(canvas, overscrollHeader, bounds); |
| 3357 | } |
| 3358 | |
| 3359 | final int start = drawOverscrollHeader ? 1 : 0; |
| 3360 | for (int i = start; i < count; i++) { |
Alan Viverette | b9fc4b8 | 2013-06-03 16:42:22 -0700 | [diff] [blame] | 3361 | final int itemIndex = (first + i); |
| 3362 | final boolean isHeader = (itemIndex < headerCount); |
| 3363 | final boolean isFooter = (itemIndex >= footerLimit); |
| 3364 | if ((headerDividers || !isHeader) && (footerDividers || !isFooter)) { |
| 3365 | final View child = getChildAt(i); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3366 | top = child.getTop(); |
Alan Viverette | b9fc4b8 | 2013-06-03 16:42:22 -0700 | [diff] [blame] | 3367 | if (drawDividers && (top > effectivePaddingTop)) { |
| 3368 | final boolean isFirstItem = (i == start); |
| 3369 | final int previousIndex = (itemIndex - 1); |
Alan Viverette | 20cc605 | 2013-11-15 15:56:38 -0800 | [diff] [blame] | 3370 | // Draw dividers between enabled items, headers |
| 3371 | // and/or footers when enabled and requested, and |
| 3372 | // before the first enabled item. |
| 3373 | if (adapter.isEnabled(itemIndex) && (headerDividers || !isHeader |
| 3374 | && (previousIndex >= headerCount)) && (isFirstItem || |
| 3375 | adapter.isEnabled(previousIndex) && (footerDividers || !isFooter |
| 3376 | && (previousIndex < footerLimit)))) { |
Romain Guy | 8f1344f5 | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 3377 | bounds.top = top - dividerHeight; |
| 3378 | bounds.bottom = top; |
Alan Viverette | b9fc4b8 | 2013-06-03 16:42:22 -0700 | [diff] [blame] | 3379 | // Give the method the child ABOVE the divider, |
| 3380 | // so we subtract one from our child position. |
| 3381 | // Give -1 when there is no child above the |
Romain Guy | 8f1344f5 | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 3382 | // divider. |
| 3383 | drawDivider(canvas, bounds, i - 1); |
Romain Guy | e32edc6 | 2009-05-29 10:33:36 -0700 | [diff] [blame] | 3384 | } else if (fillForMissingDividers) { |
Romain Guy | 8f1344f5 | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 3385 | bounds.top = top - dividerHeight; |
| 3386 | bounds.bottom = top; |
| 3387 | canvas.drawRect(bounds, paint); |
| 3388 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3389 | } |
| 3390 | } |
| 3391 | } |
Adam Powell | bfb5d4b | 2010-03-10 18:55:25 -0800 | [diff] [blame] | 3392 | |
Romain Guy | 179de8a | 2010-07-09 13:27:00 -0700 | [diff] [blame] | 3393 | if (count > 0 && scrollY > 0) { |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3394 | if (drawOverscrollFooter) { |
| 3395 | final int absListBottom = mBottom; |
| 3396 | bounds.top = absListBottom; |
| 3397 | bounds.bottom = absListBottom + scrollY; |
| 3398 | drawOverscrollFooter(canvas, overscrollFooter, bounds); |
| 3399 | } else if (drawDividers) { |
| 3400 | bounds.top = listBottom; |
| 3401 | bounds.bottom = listBottom + dividerHeight; |
| 3402 | drawDivider(canvas, bounds, -1); |
| 3403 | } |
Adam Powell | bfb5d4b | 2010-03-10 18:55:25 -0800 | [diff] [blame] | 3404 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3405 | } |
| 3406 | } |
| 3407 | |
| 3408 | // Draw the indicators (these should be drawn above the dividers) and children |
| 3409 | super.dispatchDraw(canvas); |
| 3410 | } |
| 3411 | |
Romain Guy | 0211a0a | 2011-02-14 16:34:59 -0800 | [diff] [blame] | 3412 | @Override |
| 3413 | protected boolean drawChild(Canvas canvas, View child, long drawingTime) { |
| 3414 | boolean more = super.drawChild(canvas, child, drawingTime); |
| 3415 | if (mCachingActive && child.mCachingFailed) { |
| 3416 | mCachingActive = false; |
| 3417 | } |
| 3418 | return more; |
| 3419 | } |
| 3420 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3421 | /** |
| 3422 | * Draws a divider for the given child in the given bounds. |
| 3423 | * |
| 3424 | * @param canvas The canvas to draw to. |
| 3425 | * @param bounds The bounds of the divider. |
| 3426 | * @param childIndex The index of child (of the View) above the divider. |
| 3427 | * This will be -1 if there is no child above the divider to be |
| 3428 | * drawn. |
| 3429 | */ |
| 3430 | void drawDivider(Canvas canvas, Rect bounds, int childIndex) { |
| 3431 | // This widget draws the same divider for all children |
| 3432 | final Drawable divider = mDivider; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3433 | |
Romain Guy | 95930e1 | 2010-10-04 13:46:02 -0700 | [diff] [blame] | 3434 | divider.setBounds(bounds); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3435 | divider.draw(canvas); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3436 | } |
| 3437 | |
| 3438 | /** |
| 3439 | * Returns the drawable that will be drawn between each item in the list. |
| 3440 | * |
| 3441 | * @return the current drawable drawn between list elements |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 3442 | * @attr ref R.styleable#ListView_divider |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3443 | */ |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 3444 | @Nullable |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3445 | public Drawable getDivider() { |
| 3446 | return mDivider; |
| 3447 | } |
| 3448 | |
| 3449 | /** |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 3450 | * Sets the drawable that will be drawn between each item in the list. |
| 3451 | * <p> |
| 3452 | * <strong>Note:</strong> If the drawable does not have an intrinsic |
| 3453 | * height, you should also call {@link #setDividerHeight(int)}. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3454 | * |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 3455 | * @param divider the drawable to use |
| 3456 | * @attr ref R.styleable#ListView_divider |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3457 | */ |
Alan Viverette | 7b2f864 | 2015-06-01 10:30:21 -0700 | [diff] [blame] | 3458 | public void setDivider(@Nullable Drawable divider) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3459 | if (divider != null) { |
| 3460 | mDividerHeight = divider.getIntrinsicHeight(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3461 | } else { |
| 3462 | mDividerHeight = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3463 | } |
| 3464 | mDivider = divider; |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 3465 | mDividerIsOpaque = divider == null || divider.getOpacity() == PixelFormat.OPAQUE; |
Romain Guy | eeb55e6 | 2010-12-01 18:46:07 -0800 | [diff] [blame] | 3466 | requestLayout(); |
| 3467 | invalidate(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3468 | } |
| 3469 | |
| 3470 | /** |
| 3471 | * @return Returns the height of the divider that will be drawn between each item in the list. |
| 3472 | */ |
| 3473 | public int getDividerHeight() { |
| 3474 | return mDividerHeight; |
| 3475 | } |
| 3476 | |
| 3477 | /** |
| 3478 | * Sets the height of the divider that will be drawn between each item in the list. Calling |
| 3479 | * this will override the intrinsic height as set by {@link #setDivider(Drawable)} |
| 3480 | * |
| 3481 | * @param height The new height of the divider in pixels. |
| 3482 | */ |
| 3483 | public void setDividerHeight(int height) { |
| 3484 | mDividerHeight = height; |
Romain Guy | eeb55e6 | 2010-12-01 18:46:07 -0800 | [diff] [blame] | 3485 | requestLayout(); |
| 3486 | invalidate(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3487 | } |
| 3488 | |
| 3489 | /** |
| 3490 | * Enables or disables the drawing of the divider for header views. |
| 3491 | * |
| 3492 | * @param headerDividersEnabled True to draw the headers, false otherwise. |
| 3493 | * |
| 3494 | * @see #setFooterDividersEnabled(boolean) |
Alan Viverette | 5542103 | 2013-06-11 17:50:56 -0700 | [diff] [blame] | 3495 | * @see #areHeaderDividersEnabled() |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3496 | * @see #addHeaderView(android.view.View) |
| 3497 | */ |
| 3498 | public void setHeaderDividersEnabled(boolean headerDividersEnabled) { |
| 3499 | mHeaderDividersEnabled = headerDividersEnabled; |
| 3500 | invalidate(); |
| 3501 | } |
| 3502 | |
| 3503 | /** |
Alan Viverette | 5542103 | 2013-06-11 17:50:56 -0700 | [diff] [blame] | 3504 | * @return Whether the drawing of the divider for header views is enabled |
| 3505 | * |
| 3506 | * @see #setHeaderDividersEnabled(boolean) |
| 3507 | */ |
| 3508 | public boolean areHeaderDividersEnabled() { |
| 3509 | return mHeaderDividersEnabled; |
| 3510 | } |
| 3511 | |
| 3512 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3513 | * Enables or disables the drawing of the divider for footer views. |
| 3514 | * |
| 3515 | * @param footerDividersEnabled True to draw the footers, false otherwise. |
| 3516 | * |
| 3517 | * @see #setHeaderDividersEnabled(boolean) |
Alan Viverette | 5542103 | 2013-06-11 17:50:56 -0700 | [diff] [blame] | 3518 | * @see #areFooterDividersEnabled() |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3519 | * @see #addFooterView(android.view.View) |
| 3520 | */ |
| 3521 | public void setFooterDividersEnabled(boolean footerDividersEnabled) { |
| 3522 | mFooterDividersEnabled = footerDividersEnabled; |
| 3523 | invalidate(); |
| 3524 | } |
Alan Viverette | 5542103 | 2013-06-11 17:50:56 -0700 | [diff] [blame] | 3525 | |
| 3526 | /** |
| 3527 | * @return Whether the drawing of the divider for footer views is enabled |
| 3528 | * |
| 3529 | * @see #setFooterDividersEnabled(boolean) |
| 3530 | */ |
| 3531 | public boolean areFooterDividersEnabled() { |
| 3532 | return mFooterDividersEnabled; |
| 3533 | } |
Adam Powell | bfb5d4b | 2010-03-10 18:55:25 -0800 | [diff] [blame] | 3534 | |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 3535 | /** |
| 3536 | * Sets the drawable that will be drawn above all other list content. |
| 3537 | * This area can become visible when the user overscrolls the list. |
| 3538 | * |
| 3539 | * @param header The drawable to use |
| 3540 | */ |
| 3541 | public void setOverscrollHeader(Drawable header) { |
| 3542 | mOverScrollHeader = header; |
| 3543 | if (mScrollY < 0) { |
| 3544 | invalidate(); |
| 3545 | } |
| 3546 | } |
| 3547 | |
| 3548 | /** |
| 3549 | * @return The drawable that will be drawn above all other list content |
| 3550 | */ |
| 3551 | public Drawable getOverscrollHeader() { |
| 3552 | return mOverScrollHeader; |
| 3553 | } |
| 3554 | |
| 3555 | /** |
| 3556 | * Sets the drawable that will be drawn below all other list content. |
| 3557 | * This area can become visible when the user overscrolls the list, |
| 3558 | * or when the list's content does not fully fill the container area. |
| 3559 | * |
| 3560 | * @param footer The drawable to use |
| 3561 | */ |
| 3562 | public void setOverscrollFooter(Drawable footer) { |
| 3563 | mOverScrollFooter = footer; |
| 3564 | invalidate(); |
| 3565 | } |
| 3566 | |
| 3567 | /** |
| 3568 | * @return The drawable that will be drawn below all other list content |
| 3569 | */ |
| 3570 | public Drawable getOverscrollFooter() { |
| 3571 | return mOverScrollFooter; |
| 3572 | } |
| 3573 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3574 | @Override |
| 3575 | protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { |
| 3576 | super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); |
| 3577 | |
Adam Powell | e1bf486 | 2011-09-02 16:56:20 -0700 | [diff] [blame] | 3578 | final ListAdapter adapter = mAdapter; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3579 | int closetChildIndex = -1; |
Adam Powell | dcce121 | 2011-10-31 16:41:21 -0700 | [diff] [blame] | 3580 | int closestChildTop = 0; |
Adam Powell | e1bf486 | 2011-09-02 16:56:20 -0700 | [diff] [blame] | 3581 | if (adapter != null && gainFocus && previouslyFocusedRect != null) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3582 | previouslyFocusedRect.offset(mScrollX, mScrollY); |
| 3583 | |
Adam Powell | d750783 | 2010-02-18 15:40:33 -0800 | [diff] [blame] | 3584 | // Don't cache the result of getChildCount or mFirstPosition here, |
| 3585 | // it could change in layoutChildren. |
| 3586 | if (adapter.getCount() < getChildCount() + mFirstPosition) { |
Adam Powell | c854f28 | 2009-12-16 14:11:53 -0800 | [diff] [blame] | 3587 | mLayoutMode = LAYOUT_NORMAL; |
| 3588 | layoutChildren(); |
| 3589 | } |
| 3590 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3591 | // figure out which item should be selected based on previously |
| 3592 | // focused rect |
| 3593 | Rect otherRect = mTempRect; |
| 3594 | int minDistance = Integer.MAX_VALUE; |
| 3595 | final int childCount = getChildCount(); |
Adam Powell | d750783 | 2010-02-18 15:40:33 -0800 | [diff] [blame] | 3596 | final int firstPosition = mFirstPosition; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3597 | |
| 3598 | for (int i = 0; i < childCount; i++) { |
| 3599 | // only consider selectable views |
| 3600 | if (!adapter.isEnabled(firstPosition + i)) { |
| 3601 | continue; |
| 3602 | } |
| 3603 | |
| 3604 | View other = getChildAt(i); |
| 3605 | other.getDrawingRect(otherRect); |
| 3606 | offsetDescendantRectToMyCoords(other, otherRect); |
| 3607 | int distance = getDistance(previouslyFocusedRect, otherRect, direction); |
| 3608 | |
| 3609 | if (distance < minDistance) { |
| 3610 | minDistance = distance; |
| 3611 | closetChildIndex = i; |
Adam Powell | dcce121 | 2011-10-31 16:41:21 -0700 | [diff] [blame] | 3612 | closestChildTop = other.getTop(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3613 | } |
| 3614 | } |
| 3615 | } |
| 3616 | |
| 3617 | if (closetChildIndex >= 0) { |
Adam Powell | dcce121 | 2011-10-31 16:41:21 -0700 | [diff] [blame] | 3618 | setSelectionFromTop(closetChildIndex + mFirstPosition, closestChildTop); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3619 | } else { |
| 3620 | requestLayout(); |
| 3621 | } |
| 3622 | } |
| 3623 | |
| 3624 | |
| 3625 | /* |
| 3626 | * (non-Javadoc) |
| 3627 | * |
| 3628 | * Children specified in XML are assumed to be header views. After we have |
| 3629 | * parsed them move them out of the children list and into mHeaderViews. |
| 3630 | */ |
| 3631 | @Override |
| 3632 | protected void onFinishInflate() { |
| 3633 | super.onFinishInflate(); |
| 3634 | |
| 3635 | int count = getChildCount(); |
| 3636 | if (count > 0) { |
| 3637 | for (int i = 0; i < count; ++i) { |
| 3638 | addHeaderView(getChildAt(i)); |
| 3639 | } |
| 3640 | removeAllViews(); |
| 3641 | } |
| 3642 | } |
| 3643 | |
| 3644 | /* (non-Javadoc) |
| 3645 | * @see android.view.View#findViewById(int) |
| 3646 | * First look in our children, then in any header and footer views that may be scrolled off. |
| 3647 | */ |
| 3648 | @Override |
Tor Norbye | 7b9c912 | 2013-05-30 16:48:33 -0700 | [diff] [blame] | 3649 | protected View findViewTraversal(@IdRes int id) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3650 | View v; |
| 3651 | v = super.findViewTraversal(id); |
| 3652 | if (v == null) { |
| 3653 | v = findViewInHeadersOrFooters(mHeaderViewInfos, id); |
| 3654 | if (v != null) { |
| 3655 | return v; |
| 3656 | } |
| 3657 | v = findViewInHeadersOrFooters(mFooterViewInfos, id); |
| 3658 | if (v != null) { |
| 3659 | return v; |
| 3660 | } |
| 3661 | } |
| 3662 | return v; |
| 3663 | } |
| 3664 | |
| 3665 | /* (non-Javadoc) |
| 3666 | * |
| 3667 | * Look in the passed in list of headers or footers for the view. |
| 3668 | */ |
| 3669 | View findViewInHeadersOrFooters(ArrayList<FixedViewInfo> where, int id) { |
| 3670 | if (where != null) { |
| 3671 | int len = where.size(); |
| 3672 | View v; |
| 3673 | |
| 3674 | for (int i = 0; i < len; i++) { |
| 3675 | v = where.get(i).view; |
| 3676 | |
| 3677 | if (!v.isRootNamespace()) { |
| 3678 | v = v.findViewById(id); |
| 3679 | |
| 3680 | if (v != null) { |
| 3681 | return v; |
| 3682 | } |
| 3683 | } |
| 3684 | } |
| 3685 | } |
| 3686 | return null; |
| 3687 | } |
| 3688 | |
| 3689 | /* (non-Javadoc) |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3690 | * @see android.view.View#findViewWithTag(Object) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3691 | * First look in our children, then in any header and footer views that may be scrolled off. |
| 3692 | */ |
| 3693 | @Override |
| 3694 | protected View findViewWithTagTraversal(Object tag) { |
| 3695 | View v; |
| 3696 | v = super.findViewWithTagTraversal(tag); |
| 3697 | if (v == null) { |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3698 | v = findViewWithTagInHeadersOrFooters(mHeaderViewInfos, tag); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3699 | if (v != null) { |
| 3700 | return v; |
| 3701 | } |
| 3702 | |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3703 | v = findViewWithTagInHeadersOrFooters(mFooterViewInfos, tag); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3704 | if (v != null) { |
| 3705 | return v; |
| 3706 | } |
| 3707 | } |
| 3708 | return v; |
| 3709 | } |
| 3710 | |
| 3711 | /* (non-Javadoc) |
| 3712 | * |
| 3713 | * Look in the passed in list of headers or footers for the view with the tag. |
| 3714 | */ |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3715 | View findViewWithTagInHeadersOrFooters(ArrayList<FixedViewInfo> where, Object tag) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3716 | if (where != null) { |
| 3717 | int len = where.size(); |
| 3718 | View v; |
| 3719 | |
| 3720 | for (int i = 0; i < len; i++) { |
| 3721 | v = where.get(i).view; |
| 3722 | |
| 3723 | if (!v.isRootNamespace()) { |
| 3724 | v = v.findViewWithTag(tag); |
| 3725 | |
| 3726 | if (v != null) { |
| 3727 | return v; |
| 3728 | } |
| 3729 | } |
| 3730 | } |
| 3731 | } |
| 3732 | return null; |
| 3733 | } |
| 3734 | |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3735 | /** |
| 3736 | * @hide |
| 3737 | * @see android.view.View#findViewByPredicate(Predicate) |
| 3738 | * First look in our children, then in any header and footer views that may be scrolled off. |
| 3739 | */ |
| 3740 | @Override |
Jeff Brown | 4dfbec2 | 2011-08-15 14:55:37 -0700 | [diff] [blame] | 3741 | protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3742 | View v; |
Jeff Brown | 4dfbec2 | 2011-08-15 14:55:37 -0700 | [diff] [blame] | 3743 | v = super.findViewByPredicateTraversal(predicate, childToSkip); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3744 | if (v == null) { |
Jeff Brown | 4dfbec2 | 2011-08-15 14:55:37 -0700 | [diff] [blame] | 3745 | v = findViewByPredicateInHeadersOrFooters(mHeaderViewInfos, predicate, childToSkip); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3746 | if (v != null) { |
| 3747 | return v; |
| 3748 | } |
| 3749 | |
Jeff Brown | 4dfbec2 | 2011-08-15 14:55:37 -0700 | [diff] [blame] | 3750 | v = findViewByPredicateInHeadersOrFooters(mFooterViewInfos, predicate, childToSkip); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3751 | if (v != null) { |
| 3752 | return v; |
| 3753 | } |
| 3754 | } |
| 3755 | return v; |
| 3756 | } |
| 3757 | |
| 3758 | /* (non-Javadoc) |
| 3759 | * |
| 3760 | * Look in the passed in list of headers or footers for the first view that matches |
| 3761 | * the predicate. |
| 3762 | */ |
| 3763 | View findViewByPredicateInHeadersOrFooters(ArrayList<FixedViewInfo> where, |
Jeff Brown | 4dfbec2 | 2011-08-15 14:55:37 -0700 | [diff] [blame] | 3764 | Predicate<View> predicate, View childToSkip) { |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3765 | if (where != null) { |
| 3766 | int len = where.size(); |
| 3767 | View v; |
| 3768 | |
| 3769 | for (int i = 0; i < len; i++) { |
| 3770 | v = where.get(i).view; |
| 3771 | |
Jeff Brown | 4dfbec2 | 2011-08-15 14:55:37 -0700 | [diff] [blame] | 3772 | if (v != childToSkip && !v.isRootNamespace()) { |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 3773 | v = v.findViewByPredicate(predicate); |
| 3774 | |
| 3775 | if (v != null) { |
| 3776 | return v; |
| 3777 | } |
| 3778 | } |
| 3779 | } |
| 3780 | } |
| 3781 | return null; |
| 3782 | } |
| 3783 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3784 | /** |
Gilles Debunne | fd3ddfa | 2010-02-17 16:59:20 -0800 | [diff] [blame] | 3785 | * Returns the set of checked items ids. The result is only valid if the |
Adam Powell | 8f1bfe1 | 2010-03-05 15:13:56 -0800 | [diff] [blame] | 3786 | * choice mode has not been set to {@link #CHOICE_MODE_NONE}. |
| 3787 | * |
| 3788 | * @return A new array which contains the id of each checked item in the |
| 3789 | * list. |
| 3790 | * |
Adam Powell | 463ceff | 2010-03-09 11:50:51 -0800 | [diff] [blame] | 3791 | * @deprecated Use {@link #getCheckedItemIds()} instead. |
Adam Powell | 8f1bfe1 | 2010-03-05 15:13:56 -0800 | [diff] [blame] | 3792 | */ |
Adam Powell | 8350f7d | 2010-07-28 14:27:28 -0700 | [diff] [blame] | 3793 | @Deprecated |
Adam Powell | 8f1bfe1 | 2010-03-05 15:13:56 -0800 | [diff] [blame] | 3794 | public long[] getCheckItemIds() { |
Adam Powell | 463ceff | 2010-03-09 11:50:51 -0800 | [diff] [blame] | 3795 | // Use new behavior that correctly handles stable ID mapping. |
| 3796 | if (mAdapter != null && mAdapter.hasStableIds()) { |
| 3797 | return getCheckedItemIds(); |
| 3798 | } |
| 3799 | |
| 3800 | // Old behavior was buggy, but would sort of work for adapters without stable IDs. |
| 3801 | // Fall back to it to support legacy apps. |
| 3802 | if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null && mAdapter != null) { |
| 3803 | final SparseBooleanArray states = mCheckStates; |
| 3804 | final int count = states.size(); |
| 3805 | final long[] ids = new long[count]; |
| 3806 | final ListAdapter adapter = mAdapter; |
| 3807 | |
| 3808 | int checkedCount = 0; |
| 3809 | for (int i = 0; i < count; i++) { |
| 3810 | if (states.valueAt(i)) { |
| 3811 | ids[checkedCount++] = adapter.getItemId(states.keyAt(i)); |
| 3812 | } |
| 3813 | } |
| 3814 | |
| 3815 | // Trim array if needed. mCheckStates may contain false values |
| 3816 | // resulting in checkedCount being smaller than count. |
| 3817 | if (checkedCount == count) { |
| 3818 | return ids; |
| 3819 | } else { |
| 3820 | final long[] result = new long[checkedCount]; |
| 3821 | System.arraycopy(ids, 0, result, 0, checkedCount); |
| 3822 | |
| 3823 | return result; |
| 3824 | } |
| 3825 | } |
| 3826 | return new long[0]; |
Adam Powell | 8f1bfe1 | 2010-03-05 15:13:56 -0800 | [diff] [blame] | 3827 | } |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 3828 | |
| 3829 | @Override |
Alan Viverette | 441b437 | 2014-02-12 13:30:20 -0800 | [diff] [blame] | 3830 | int getHeightForPosition(int position) { |
| 3831 | final int height = super.getHeightForPosition(position); |
| 3832 | if (shouldAdjustHeightForDivider(position)) { |
| 3833 | return height + mDividerHeight; |
| 3834 | } |
| 3835 | return height; |
| 3836 | } |
| 3837 | |
| 3838 | private boolean shouldAdjustHeightForDivider(int itemIndex) { |
| 3839 | final int dividerHeight = mDividerHeight; |
| 3840 | final Drawable overscrollHeader = mOverScrollHeader; |
| 3841 | final Drawable overscrollFooter = mOverScrollFooter; |
| 3842 | final boolean drawOverscrollHeader = overscrollHeader != null; |
| 3843 | final boolean drawOverscrollFooter = overscrollFooter != null; |
| 3844 | final boolean drawDividers = dividerHeight > 0 && mDivider != null; |
| 3845 | |
| 3846 | if (drawDividers) { |
| 3847 | final boolean fillForMissingDividers = isOpaque() && !super.isOpaque(); |
| 3848 | final int itemCount = mItemCount; |
| 3849 | final int headerCount = mHeaderViewInfos.size(); |
| 3850 | final int footerLimit = (itemCount - mFooterViewInfos.size()); |
| 3851 | final boolean isHeader = (itemIndex < headerCount); |
| 3852 | final boolean isFooter = (itemIndex >= footerLimit); |
| 3853 | final boolean headerDividers = mHeaderDividersEnabled; |
| 3854 | final boolean footerDividers = mFooterDividersEnabled; |
| 3855 | if ((headerDividers || !isHeader) && (footerDividers || !isFooter)) { |
| 3856 | final ListAdapter adapter = mAdapter; |
| 3857 | if (!mStackFromBottom) { |
| 3858 | final boolean isLastItem = (itemIndex == (itemCount - 1)); |
| 3859 | if (!drawOverscrollFooter || !isLastItem) { |
| 3860 | final int nextIndex = itemIndex + 1; |
| 3861 | // Draw dividers between enabled items, headers |
| 3862 | // and/or footers when enabled and requested, and |
| 3863 | // after the last enabled item. |
| 3864 | if (adapter.isEnabled(itemIndex) && (headerDividers || !isHeader |
| 3865 | && (nextIndex >= headerCount)) && (isLastItem |
| 3866 | || adapter.isEnabled(nextIndex) && (footerDividers || !isFooter |
| 3867 | && (nextIndex < footerLimit)))) { |
| 3868 | return true; |
| 3869 | } else if (fillForMissingDividers) { |
| 3870 | return true; |
| 3871 | } |
| 3872 | } |
| 3873 | } else { |
| 3874 | final int start = drawOverscrollHeader ? 1 : 0; |
| 3875 | final boolean isFirstItem = (itemIndex == start); |
| 3876 | if (!isFirstItem) { |
| 3877 | final int previousIndex = (itemIndex - 1); |
| 3878 | // Draw dividers between enabled items, headers |
| 3879 | // and/or footers when enabled and requested, and |
| 3880 | // before the first enabled item. |
| 3881 | if (adapter.isEnabled(itemIndex) && (headerDividers || !isHeader |
| 3882 | && (previousIndex >= headerCount)) && (isFirstItem || |
| 3883 | adapter.isEnabled(previousIndex) && (footerDividers || !isFooter |
| 3884 | && (previousIndex < footerLimit)))) { |
| 3885 | return true; |
| 3886 | } else if (fillForMissingDividers) { |
| 3887 | return true; |
| 3888 | } |
| 3889 | } |
| 3890 | } |
| 3891 | } |
| 3892 | } |
| 3893 | |
| 3894 | return false; |
| 3895 | } |
| 3896 | |
| 3897 | @Override |
Dianne Hackborn | a7bb6fb | 2015-02-03 18:13:40 -0800 | [diff] [blame] | 3898 | public CharSequence getAccessibilityClassName() { |
| 3899 | return ListView.class.getName(); |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 3900 | } |
| 3901 | |
Alan Viverette | a54956a | 2015-01-07 16:05:02 -0800 | [diff] [blame] | 3902 | /** @hide */ |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 3903 | @Override |
Alan Viverette | a54956a | 2015-01-07 16:05:02 -0800 | [diff] [blame] | 3904 | public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { |
| 3905 | super.onInitializeAccessibilityNodeInfoInternal(info); |
Alan Viverette | 5b2081d | 2013-08-28 10:43:07 -0700 | [diff] [blame] | 3906 | |
Alan Viverette | 77c180a | 2014-09-08 15:30:34 -0700 | [diff] [blame] | 3907 | final int rowsCount = getCount(); |
Alan Viverette | 76769ae | 2014-02-12 16:38:10 -0800 | [diff] [blame] | 3908 | final int selectionMode = getSelectionModeForAccessibility(); |
Alan Viverette | 77c180a | 2014-09-08 15:30:34 -0700 | [diff] [blame] | 3909 | final CollectionInfo collectionInfo = CollectionInfo.obtain( |
| 3910 | rowsCount, 1, false, selectionMode); |
Alan Viverette | 5b2081d | 2013-08-28 10:43:07 -0700 | [diff] [blame] | 3911 | info.setCollectionInfo(collectionInfo); |
Alan Viverette | 23f4432 | 2015-04-06 16:04:56 -0700 | [diff] [blame] | 3912 | |
| 3913 | if (rowsCount > 0) { |
| 3914 | info.addAction(AccessibilityAction.ACTION_SCROLL_TO_POSITION); |
| 3915 | } |
| 3916 | } |
| 3917 | |
| 3918 | /** @hide */ |
| 3919 | @Override |
| 3920 | public boolean performAccessibilityActionInternal(int action, Bundle arguments) { |
| 3921 | if (super.performAccessibilityActionInternal(action, arguments)) { |
| 3922 | return true; |
| 3923 | } |
| 3924 | |
| 3925 | switch (action) { |
| 3926 | case R.id.accessibilityActionScrollToPosition: { |
| 3927 | final int row = arguments.getInt(AccessibilityNodeInfo.ACTION_ARGUMENT_ROW_INT, -1); |
| 3928 | final int position = Math.min(row, getCount() - 1); |
| 3929 | if (row >= 0) { |
| 3930 | // The accessibility service gets data asynchronously, so |
| 3931 | // we'll be a little lenient by clamping the last position. |
| 3932 | smoothScrollToPosition(position); |
| 3933 | return true; |
| 3934 | } |
| 3935 | } break; |
| 3936 | } |
| 3937 | |
| 3938 | return false; |
Alan Viverette | 5b2081d | 2013-08-28 10:43:07 -0700 | [diff] [blame] | 3939 | } |
| 3940 | |
| 3941 | @Override |
| 3942 | public void onInitializeAccessibilityNodeInfoForItem( |
| 3943 | View view, int position, AccessibilityNodeInfo info) { |
| 3944 | super.onInitializeAccessibilityNodeInfoForItem(view, position, info); |
| 3945 | |
| 3946 | final LayoutParams lp = (LayoutParams) view.getLayoutParams(); |
| 3947 | final boolean isHeading = lp != null && lp.viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER; |
Alan Viverette | 76769ae | 2014-02-12 16:38:10 -0800 | [diff] [blame] | 3948 | final boolean isSelected = isItemChecked(position); |
| 3949 | final CollectionItemInfo itemInfo = CollectionItemInfo.obtain( |
Alan Viverette | 77c180a | 2014-09-08 15:30:34 -0700 | [diff] [blame] | 3950 | position, 1, 0, 1, isHeading, isSelected); |
Alan Viverette | 5b2081d | 2013-08-28 10:43:07 -0700 | [diff] [blame] | 3951 | info.setCollectionItemInfo(itemInfo); |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 3952 | } |
Siva Velusamy | 94a6d15 | 2015-05-05 15:07:00 -0700 | [diff] [blame] | 3953 | |
| 3954 | /** @hide */ |
| 3955 | @Override |
| 3956 | protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) { |
| 3957 | super.encodeProperties(encoder); |
| 3958 | |
| 3959 | encoder.addProperty("recycleOnMeasure", recycleOnMeasure()); |
| 3960 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3961 | } |