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 | |
| 19 | import android.content.Context; |
| 20 | import android.content.res.TypedArray; |
| 21 | import android.graphics.Canvas; |
| 22 | import android.graphics.Rect; |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 23 | import android.graphics.PixelFormat; |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 24 | import android.graphics.Paint; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 25 | import android.graphics.drawable.Drawable; |
| 26 | import android.graphics.drawable.ColorDrawable; |
| 27 | import android.os.Parcel; |
| 28 | import android.os.Parcelable; |
| 29 | import android.util.AttributeSet; |
| 30 | import android.util.SparseBooleanArray; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 31 | import android.view.FocusFinder; |
| 32 | import android.view.KeyEvent; |
| 33 | import android.view.MotionEvent; |
| 34 | import android.view.View; |
| 35 | import android.view.ViewDebug; |
| 36 | import android.view.ViewGroup; |
| 37 | import android.view.ViewParent; |
| 38 | import android.view.SoundEffectConstants; |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 39 | import android.view.accessibility.AccessibilityEvent; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 40 | |
| 41 | import com.google.android.collect.Lists; |
| 42 | import com.android.internal.R; |
| 43 | |
| 44 | import java.util.ArrayList; |
| 45 | |
| 46 | /* |
| 47 | * Implementation Notes: |
| 48 | * |
| 49 | * Some terminology: |
| 50 | * |
| 51 | * index - index of the items that are currently visible |
| 52 | * position - index of the items in the cursor |
| 53 | */ |
| 54 | |
| 55 | |
| 56 | /** |
| 57 | * A view that shows items in a vertically scrolling list. The items |
| 58 | * come from the {@link ListAdapter} associated with this view. |
| 59 | * |
| 60 | * @attr ref android.R.styleable#ListView_entries |
| 61 | * @attr ref android.R.styleable#ListView_divider |
| 62 | * @attr ref android.R.styleable#ListView_dividerHeight |
| 63 | * @attr ref android.R.styleable#ListView_choiceMode |
| 64 | * @attr ref android.R.styleable#ListView_headerDividersEnabled |
| 65 | * @attr ref android.R.styleable#ListView_footerDividersEnabled |
| 66 | */ |
| 67 | public class ListView extends AbsListView { |
| 68 | /** |
| 69 | * Used to indicate a no preference for a position type. |
| 70 | */ |
| 71 | static final int NO_POSITION = -1; |
| 72 | |
| 73 | /** |
| 74 | * Normal list that does not indicate choices |
| 75 | */ |
| 76 | public static final int CHOICE_MODE_NONE = 0; |
| 77 | |
| 78 | /** |
| 79 | * The list allows up to one choice |
| 80 | */ |
| 81 | public static final int CHOICE_MODE_SINGLE = 1; |
| 82 | |
| 83 | /** |
| 84 | * The list allows multiple choices |
| 85 | */ |
| 86 | public static final int CHOICE_MODE_MULTIPLE = 2; |
| 87 | |
| 88 | /** |
| 89 | * When arrow scrolling, ListView will never scroll more than this factor |
| 90 | * times the height of the list. |
| 91 | */ |
| 92 | private static final float MAX_SCROLL_FACTOR = 0.33f; |
| 93 | |
| 94 | /** |
| 95 | * When arrow scrolling, need a certain amount of pixels to preview next |
| 96 | * items. This is usually the fading edge, but if that is small enough, |
| 97 | * we want to make sure we preview at least this many pixels. |
| 98 | */ |
| 99 | private static final int MIN_SCROLL_PREVIEW_PIXELS = 2; |
| 100 | |
| 101 | /** |
| 102 | * A class that represents a fixed view in a list, for example a header at the top |
| 103 | * or a footer at the bottom. |
| 104 | */ |
| 105 | public class FixedViewInfo { |
| 106 | /** The view to add to the list */ |
| 107 | public View view; |
| 108 | /** The data backing the view. This is returned from {@link ListAdapter#getItem(int)}. */ |
| 109 | public Object data; |
| 110 | /** <code>true</code> if the fixed view should be selectable in the list */ |
| 111 | public boolean isSelectable; |
| 112 | } |
| 113 | |
| 114 | private ArrayList<FixedViewInfo> mHeaderViewInfos = Lists.newArrayList(); |
| 115 | private ArrayList<FixedViewInfo> mFooterViewInfos = Lists.newArrayList(); |
| 116 | |
| 117 | Drawable mDivider; |
| 118 | int mDividerHeight; |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 119 | |
| 120 | private boolean mIsCacheColorOpaque; |
| 121 | private boolean mDividerIsOpaque; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 122 | private boolean mClipDivider; |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 123 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 124 | private boolean mHeaderDividersEnabled; |
| 125 | private boolean mFooterDividersEnabled; |
| 126 | |
| 127 | private boolean mAreAllItemsSelectable = true; |
| 128 | |
| 129 | private boolean mItemsCanFocus = false; |
| 130 | |
| 131 | private int mChoiceMode = CHOICE_MODE_NONE; |
| 132 | |
| 133 | private SparseBooleanArray mCheckStates; |
| 134 | |
| 135 | // used for temporary calculations. |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 136 | private final Rect mTempRect = new Rect(); |
Romain Guy | a02903f | 2009-05-23 13:26:46 -0700 | [diff] [blame] | 137 | private Paint mDividerPaint; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 138 | |
| 139 | // the single allocated result per list view; kinda cheesey but avoids |
| 140 | // allocating these thingies too often. |
| 141 | private ArrowScrollFocusResult mArrowScrollFocusResult = new ArrowScrollFocusResult(); |
| 142 | |
| 143 | public ListView(Context context) { |
| 144 | this(context, null); |
| 145 | } |
| 146 | |
| 147 | public ListView(Context context, AttributeSet attrs) { |
| 148 | this(context, attrs, com.android.internal.R.attr.listViewStyle); |
| 149 | } |
| 150 | |
| 151 | public ListView(Context context, AttributeSet attrs, int defStyle) { |
| 152 | super(context, attrs, defStyle); |
| 153 | |
| 154 | TypedArray a = context.obtainStyledAttributes(attrs, |
| 155 | com.android.internal.R.styleable.ListView, defStyle, 0); |
| 156 | |
| 157 | CharSequence[] entries = a.getTextArray( |
| 158 | com.android.internal.R.styleable.ListView_entries); |
| 159 | if (entries != null) { |
| 160 | setAdapter(new ArrayAdapter<CharSequence>(context, |
| 161 | com.android.internal.R.layout.simple_list_item_1, entries)); |
| 162 | } |
| 163 | |
| 164 | final Drawable d = a.getDrawable(com.android.internal.R.styleable.ListView_divider); |
| 165 | if (d != null) { |
| 166 | // If a divider is specified use its intrinsic height for divider height |
| 167 | setDivider(d); |
| 168 | } |
| 169 | |
| 170 | // Use the height specified, zero being the default |
| 171 | final int dividerHeight = a.getDimensionPixelSize( |
| 172 | com.android.internal.R.styleable.ListView_dividerHeight, 0); |
| 173 | if (dividerHeight != 0) { |
| 174 | setDividerHeight(dividerHeight); |
| 175 | } |
| 176 | |
Romain Guy | 536fb04 | 2009-06-17 17:01:04 -0700 | [diff] [blame] | 177 | setChoiceMode(a.getInt(R.styleable.ListView_choiceMode, CHOICE_MODE_NONE)); |
| 178 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 179 | mHeaderDividersEnabled = a.getBoolean(R.styleable.ListView_headerDividersEnabled, true); |
| 180 | mFooterDividersEnabled = a.getBoolean(R.styleable.ListView_footerDividersEnabled, true); |
| 181 | |
| 182 | a.recycle(); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * @return The maximum amount a list view will scroll in response to |
| 187 | * an arrow event. |
| 188 | */ |
| 189 | public int getMaxScrollAmount() { |
| 190 | return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Make sure views are touching the top or bottom edge, as appropriate for |
| 195 | * our gravity |
| 196 | */ |
| 197 | private void adjustViewsUpOrDown() { |
| 198 | final int childCount = getChildCount(); |
| 199 | int delta; |
| 200 | |
| 201 | if (childCount > 0) { |
| 202 | View child; |
| 203 | |
| 204 | if (!mStackFromBottom) { |
| 205 | // Uh-oh -- we came up short. Slide all views up to make them |
| 206 | // align with the top |
| 207 | child = getChildAt(0); |
| 208 | delta = child.getTop() - mListPadding.top; |
| 209 | if (mFirstPosition != 0) { |
| 210 | // It's OK to have some space above the first item if it is |
| 211 | // part of the vertical spacing |
| 212 | delta -= mDividerHeight; |
| 213 | } |
| 214 | if (delta < 0) { |
| 215 | // We only are looking to see if we are too low, not too high |
| 216 | delta = 0; |
| 217 | } |
| 218 | } else { |
| 219 | // we are too high, slide all views down to align with bottom |
| 220 | child = getChildAt(childCount - 1); |
| 221 | delta = child.getBottom() - (getHeight() - mListPadding.bottom); |
| 222 | |
| 223 | if (mFirstPosition + childCount < mItemCount) { |
| 224 | // It's OK to have some space below the last item if it is |
| 225 | // part of the vertical spacing |
| 226 | delta += mDividerHeight; |
| 227 | } |
| 228 | |
| 229 | if (delta > 0) { |
| 230 | delta = 0; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | if (delta != 0) { |
| 235 | offsetChildrenTopAndBottom(-delta); |
| 236 | } |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Add a fixed view to appear at the top of the list. If addHeaderView is |
| 242 | * called more than once, the views will appear in the order they were |
| 243 | * added. Views added using this call can take focus if they want. |
| 244 | * <p> |
| 245 | * NOTE: Call this before calling setAdapter. This is so ListView can wrap |
| 246 | * the supplied cursor with one that that will also account for header |
| 247 | * views. |
| 248 | * |
| 249 | * @param v The view to add. |
| 250 | * @param data Data to associate with this view |
| 251 | * @param isSelectable whether the item is selectable |
| 252 | */ |
| 253 | public void addHeaderView(View v, Object data, boolean isSelectable) { |
| 254 | |
| 255 | if (mAdapter != null) { |
| 256 | throw new IllegalStateException( |
| 257 | "Cannot add header view to list -- setAdapter has already been called."); |
| 258 | } |
| 259 | |
| 260 | FixedViewInfo info = new FixedViewInfo(); |
| 261 | info.view = v; |
| 262 | info.data = data; |
| 263 | info.isSelectable = isSelectable; |
| 264 | mHeaderViewInfos.add(info); |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Add a fixed view to appear at the top of the list. If addHeaderView is |
| 269 | * called more than once, the views will appear in the order they were |
| 270 | * added. Views added using this call can take focus if they want. |
| 271 | * <p> |
| 272 | * NOTE: Call this before calling setAdapter. This is so ListView can wrap |
| 273 | * the supplied cursor with one that that will also account for header |
| 274 | * views. |
| 275 | * |
| 276 | * @param v The view to add. |
| 277 | */ |
| 278 | public void addHeaderView(View v) { |
| 279 | addHeaderView(v, null, true); |
| 280 | } |
| 281 | |
| 282 | @Override |
| 283 | public int getHeaderViewsCount() { |
| 284 | return mHeaderViewInfos.size(); |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Removes a previously-added header view. |
| 289 | * |
| 290 | * @param v The view to remove |
| 291 | * @return true if the view was removed, false if the view was not a header |
| 292 | * view |
| 293 | */ |
| 294 | public boolean removeHeaderView(View v) { |
| 295 | if (mHeaderViewInfos.size() > 0) { |
| 296 | boolean result = false; |
| 297 | if (((HeaderViewListAdapter) mAdapter).removeHeader(v)) { |
| 298 | mDataSetObserver.onChanged(); |
| 299 | result = true; |
| 300 | } |
| 301 | removeFixedViewInfo(v, mHeaderViewInfos); |
| 302 | return result; |
| 303 | } |
| 304 | return false; |
| 305 | } |
| 306 | |
| 307 | private void removeFixedViewInfo(View v, ArrayList<FixedViewInfo> where) { |
| 308 | int len = where.size(); |
| 309 | for (int i = 0; i < len; ++i) { |
| 310 | FixedViewInfo info = where.get(i); |
| 311 | if (info.view == v) { |
| 312 | where.remove(i); |
| 313 | break; |
| 314 | } |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * Add a fixed view to appear at the bottom of the list. If addFooterView is |
| 320 | * called more than once, the views will appear in the order they were |
| 321 | * added. Views added using this call can take focus if they want. |
| 322 | * <p> |
| 323 | * NOTE: Call this before calling setAdapter. This is so ListView can wrap |
| 324 | * the supplied cursor with one that that will also account for header |
| 325 | * views. |
| 326 | * |
| 327 | * @param v The view to add. |
| 328 | * @param data Data to associate with this view |
| 329 | * @param isSelectable true if the footer view can be selected |
| 330 | */ |
| 331 | public void addFooterView(View v, Object data, boolean isSelectable) { |
| 332 | FixedViewInfo info = new FixedViewInfo(); |
| 333 | info.view = v; |
| 334 | info.data = data; |
| 335 | info.isSelectable = isSelectable; |
| 336 | mFooterViewInfos.add(info); |
| 337 | |
| 338 | // in the case of re-adding a footer view, or adding one later on, |
| 339 | // we need to notify the observer |
| 340 | if (mDataSetObserver != null) { |
| 341 | mDataSetObserver.onChanged(); |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | /** |
| 346 | * Add a fixed view to appear at the bottom of the list. If addFooterView is called more |
| 347 | * than once, the views will appear in the order they were added. Views added using |
| 348 | * this call can take focus if they want. |
| 349 | * <p>NOTE: Call this before calling setAdapter. This is so ListView can wrap the supplied |
| 350 | * cursor with one that that will also account for header views. |
| 351 | * |
| 352 | * |
| 353 | * @param v The view to add. |
| 354 | */ |
| 355 | public void addFooterView(View v) { |
| 356 | addFooterView(v, null, true); |
| 357 | } |
| 358 | |
| 359 | @Override |
| 360 | public int getFooterViewsCount() { |
| 361 | return mFooterViewInfos.size(); |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * Removes a previously-added footer view. |
| 366 | * |
| 367 | * @param v The view to remove |
| 368 | * @return |
| 369 | * true if the view was removed, false if the view was not a footer view |
| 370 | */ |
| 371 | public boolean removeFooterView(View v) { |
| 372 | if (mFooterViewInfos.size() > 0) { |
| 373 | boolean result = false; |
| 374 | if (((HeaderViewListAdapter) mAdapter).removeFooter(v)) { |
| 375 | mDataSetObserver.onChanged(); |
| 376 | result = true; |
| 377 | } |
| 378 | removeFixedViewInfo(v, mFooterViewInfos); |
| 379 | return result; |
| 380 | } |
| 381 | return false; |
| 382 | } |
| 383 | |
| 384 | /** |
| 385 | * Returns the adapter currently in use in this ListView. The returned adapter |
| 386 | * might not be the same adapter passed to {@link #setAdapter(ListAdapter)} but |
| 387 | * might be a {@link WrapperListAdapter}. |
| 388 | * |
| 389 | * @return The adapter currently used to display data in this ListView. |
| 390 | * |
| 391 | * @see #setAdapter(ListAdapter) |
| 392 | */ |
| 393 | @Override |
| 394 | public ListAdapter getAdapter() { |
| 395 | return mAdapter; |
| 396 | } |
| 397 | |
| 398 | /** |
| 399 | * Sets the data behind this ListView. |
| 400 | * |
| 401 | * The adapter passed to this method may be wrapped by a {@link WrapperListAdapter}, |
| 402 | * depending on the ListView features currently in use. For instance, adding |
| 403 | * headers and/or footers will cause the adapter to be wrapped. |
| 404 | * |
| 405 | * @param adapter The ListAdapter which is responsible for maintaining the |
| 406 | * data backing this list and for producing a view to represent an |
| 407 | * item in that data set. |
| 408 | * |
| 409 | * @see #getAdapter() |
| 410 | */ |
| 411 | @Override |
| 412 | public void setAdapter(ListAdapter adapter) { |
| 413 | if (null != mAdapter) { |
| 414 | mAdapter.unregisterDataSetObserver(mDataSetObserver); |
| 415 | } |
| 416 | |
| 417 | resetList(); |
| 418 | mRecycler.clear(); |
| 419 | |
| 420 | if (mHeaderViewInfos.size() > 0|| mFooterViewInfos.size() > 0) { |
| 421 | mAdapter = new HeaderViewListAdapter(mHeaderViewInfos, mFooterViewInfos, adapter); |
| 422 | } else { |
| 423 | mAdapter = adapter; |
| 424 | } |
| 425 | |
| 426 | mOldSelectedPosition = INVALID_POSITION; |
| 427 | mOldSelectedRowId = INVALID_ROW_ID; |
| 428 | if (mAdapter != null) { |
| 429 | mAreAllItemsSelectable = mAdapter.areAllItemsEnabled(); |
| 430 | mOldItemCount = mItemCount; |
| 431 | mItemCount = mAdapter.getCount(); |
| 432 | checkFocus(); |
| 433 | |
| 434 | mDataSetObserver = new AdapterDataSetObserver(); |
| 435 | mAdapter.registerDataSetObserver(mDataSetObserver); |
| 436 | |
| 437 | mRecycler.setViewTypeCount(mAdapter.getViewTypeCount()); |
| 438 | |
| 439 | int position; |
| 440 | if (mStackFromBottom) { |
| 441 | position = lookForSelectablePosition(mItemCount - 1, false); |
| 442 | } else { |
| 443 | position = lookForSelectablePosition(0, true); |
| 444 | } |
| 445 | setSelectedPositionInt(position); |
| 446 | setNextSelectedPositionInt(position); |
| 447 | |
| 448 | if (mItemCount == 0) { |
| 449 | // Nothing selected |
| 450 | checkSelectionChanged(); |
| 451 | } |
| 452 | |
| 453 | } else { |
| 454 | mAreAllItemsSelectable = true; |
| 455 | checkFocus(); |
| 456 | // Nothing selected |
| 457 | checkSelectionChanged(); |
| 458 | } |
| 459 | |
| 460 | if (mCheckStates != null) { |
| 461 | mCheckStates.clear(); |
| 462 | } |
| 463 | |
| 464 | requestLayout(); |
| 465 | } |
| 466 | |
| 467 | |
| 468 | /** |
| 469 | * The list is empty. Clear everything out. |
| 470 | */ |
| 471 | @Override |
| 472 | void resetList() { |
Romain Guy | 2e447d4 | 2009-04-28 18:01:24 -0700 | [diff] [blame] | 473 | // The parent's resetList() will remove all views from the layout so we need to |
| 474 | // cleanup the state of our footers and headers |
| 475 | clearRecycledState(mHeaderViewInfos); |
| 476 | clearRecycledState(mFooterViewInfos); |
| 477 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 478 | super.resetList(); |
Romain Guy | 2e447d4 | 2009-04-28 18:01:24 -0700 | [diff] [blame] | 479 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 480 | mLayoutMode = LAYOUT_NORMAL; |
| 481 | } |
| 482 | |
Romain Guy | 2e447d4 | 2009-04-28 18:01:24 -0700 | [diff] [blame] | 483 | private void clearRecycledState(ArrayList<FixedViewInfo> infos) { |
| 484 | if (infos != null) { |
| 485 | final int count = infos.size(); |
| 486 | |
| 487 | for (int i = 0; i < count; i++) { |
| 488 | final View child = infos.get(i).view; |
| 489 | final LayoutParams p = (LayoutParams) child.getLayoutParams(); |
| 490 | if (p != null) { |
| 491 | p.recycledHeaderFooter = false; |
| 492 | } |
| 493 | } |
| 494 | } |
| 495 | } |
| 496 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 497 | /** |
| 498 | * @return Whether the list needs to show the top fading edge |
| 499 | */ |
| 500 | private boolean showingTopFadingEdge() { |
| 501 | final int listTop = mScrollY + mListPadding.top; |
| 502 | return (mFirstPosition > 0) || (getChildAt(0).getTop() > listTop); |
| 503 | } |
| 504 | |
| 505 | /** |
| 506 | * @return Whether the list needs to show the bottom fading edge |
| 507 | */ |
| 508 | private boolean showingBottomFadingEdge() { |
| 509 | final int childCount = getChildCount(); |
| 510 | final int bottomOfBottomChild = getChildAt(childCount - 1).getBottom(); |
| 511 | final int lastVisiblePosition = mFirstPosition + childCount - 1; |
| 512 | |
| 513 | final int listBottom = mScrollY + getHeight() - mListPadding.bottom; |
| 514 | |
| 515 | return (lastVisiblePosition < mItemCount - 1) |
| 516 | || (bottomOfBottomChild < listBottom); |
| 517 | } |
| 518 | |
| 519 | |
| 520 | @Override |
| 521 | public boolean requestChildRectangleOnScreen(View child, Rect rect, boolean immediate) { |
| 522 | |
| 523 | int rectTopWithinChild = rect.top; |
| 524 | |
| 525 | // offset so rect is in coordinates of the this view |
| 526 | rect.offset(child.getLeft(), child.getTop()); |
| 527 | rect.offset(-child.getScrollX(), -child.getScrollY()); |
| 528 | |
| 529 | final int height = getHeight(); |
| 530 | int listUnfadedTop = getScrollY(); |
| 531 | int listUnfadedBottom = listUnfadedTop + height; |
| 532 | final int fadingEdge = getVerticalFadingEdgeLength(); |
| 533 | |
| 534 | if (showingTopFadingEdge()) { |
| 535 | // leave room for top fading edge as long as rect isn't at very top |
| 536 | if ((mSelectedPosition > 0) || (rectTopWithinChild > fadingEdge)) { |
| 537 | listUnfadedTop += fadingEdge; |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | int childCount = getChildCount(); |
| 542 | int bottomOfBottomChild = getChildAt(childCount - 1).getBottom(); |
| 543 | |
| 544 | if (showingBottomFadingEdge()) { |
| 545 | // leave room for bottom fading edge as long as rect isn't at very bottom |
| 546 | if ((mSelectedPosition < mItemCount - 1) |
| 547 | || (rect.bottom < (bottomOfBottomChild - fadingEdge))) { |
| 548 | listUnfadedBottom -= fadingEdge; |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | int scrollYDelta = 0; |
| 553 | |
| 554 | if (rect.bottom > listUnfadedBottom && rect.top > listUnfadedTop) { |
| 555 | // need to MOVE DOWN to get it in view: move down just enough so |
| 556 | // that the entire rectangle is in view (or at least the first |
| 557 | // screen size chunk). |
| 558 | |
| 559 | if (rect.height() > height) { |
| 560 | // just enough to get screen size chunk on |
| 561 | scrollYDelta += (rect.top - listUnfadedTop); |
| 562 | } else { |
| 563 | // get entire rect at bottom of screen |
| 564 | scrollYDelta += (rect.bottom - listUnfadedBottom); |
| 565 | } |
| 566 | |
| 567 | // make sure we aren't scrolling beyond the end of our children |
| 568 | int distanceToBottom = bottomOfBottomChild - listUnfadedBottom; |
| 569 | scrollYDelta = Math.min(scrollYDelta, distanceToBottom); |
| 570 | } else if (rect.top < listUnfadedTop && rect.bottom < listUnfadedBottom) { |
| 571 | // need to MOVE UP to get it in view: move up just enough so that |
| 572 | // entire rectangle is in view (or at least the first screen |
| 573 | // size chunk of it). |
| 574 | |
| 575 | if (rect.height() > height) { |
| 576 | // screen size chunk |
| 577 | scrollYDelta -= (listUnfadedBottom - rect.bottom); |
| 578 | } else { |
| 579 | // entire rect at top |
| 580 | scrollYDelta -= (listUnfadedTop - rect.top); |
| 581 | } |
| 582 | |
| 583 | // make sure we aren't scrolling any further than the top our children |
| 584 | int top = getChildAt(0).getTop(); |
| 585 | int deltaToTop = top - listUnfadedTop; |
| 586 | scrollYDelta = Math.max(scrollYDelta, deltaToTop); |
| 587 | } |
| 588 | |
| 589 | final boolean scroll = scrollYDelta != 0; |
| 590 | if (scroll) { |
| 591 | scrollListItemsBy(-scrollYDelta); |
| 592 | positionSelector(child); |
| 593 | mSelectedTop = child.getTop(); |
| 594 | invalidate(); |
| 595 | } |
| 596 | return scroll; |
| 597 | } |
| 598 | |
| 599 | /** |
| 600 | * {@inheritDoc} |
| 601 | */ |
| 602 | @Override |
| 603 | void fillGap(boolean down) { |
| 604 | final int count = getChildCount(); |
| 605 | if (down) { |
| 606 | final int startOffset = count > 0 ? getChildAt(count - 1).getBottom() + mDividerHeight : |
| 607 | getListPaddingTop(); |
| 608 | fillDown(mFirstPosition + count, startOffset); |
| 609 | correctTooHigh(getChildCount()); |
| 610 | } else { |
| 611 | final int startOffset = count > 0 ? getChildAt(0).getTop() - mDividerHeight : |
| 612 | getHeight() - getListPaddingBottom(); |
| 613 | fillUp(mFirstPosition - 1, startOffset); |
| 614 | correctTooLow(getChildCount()); |
| 615 | } |
| 616 | } |
| 617 | |
| 618 | /** |
| 619 | * Fills the list from pos down to the end of the list view. |
| 620 | * |
| 621 | * @param pos The first position to put in the list |
| 622 | * |
| 623 | * @param nextTop The location where the top of the item associated with pos |
| 624 | * should be drawn |
| 625 | * |
| 626 | * @return The view that is currently selected, if it happens to be in the |
| 627 | * range that we draw. |
| 628 | */ |
| 629 | private View fillDown(int pos, int nextTop) { |
| 630 | View selectedView = null; |
| 631 | |
| 632 | int end = (mBottom - mTop) - mListPadding.bottom; |
| 633 | |
| 634 | while (nextTop < end && pos < mItemCount) { |
| 635 | // is this the selected item? |
| 636 | boolean selected = pos == mSelectedPosition; |
| 637 | View child = makeAndAddView(pos, nextTop, true, mListPadding.left, selected); |
| 638 | |
| 639 | nextTop = child.getBottom() + mDividerHeight; |
| 640 | if (selected) { |
| 641 | selectedView = child; |
| 642 | } |
| 643 | pos++; |
| 644 | } |
| 645 | |
| 646 | return selectedView; |
| 647 | } |
| 648 | |
| 649 | /** |
| 650 | * Fills the list from pos up to the top of the list view. |
| 651 | * |
| 652 | * @param pos The first position to put in the list |
| 653 | * |
| 654 | * @param nextBottom The location where the bottom of the item associated |
| 655 | * with pos should be drawn |
| 656 | * |
| 657 | * @return The view that is currently selected |
| 658 | */ |
| 659 | private View fillUp(int pos, int nextBottom) { |
| 660 | View selectedView = null; |
| 661 | |
| 662 | int end = mListPadding.top; |
| 663 | |
| 664 | while (nextBottom > end && pos >= 0) { |
| 665 | // is this the selected item? |
| 666 | boolean selected = pos == mSelectedPosition; |
| 667 | View child = makeAndAddView(pos, nextBottom, false, mListPadding.left, selected); |
| 668 | nextBottom = child.getTop() - mDividerHeight; |
| 669 | if (selected) { |
| 670 | selectedView = child; |
| 671 | } |
| 672 | pos--; |
| 673 | } |
| 674 | |
| 675 | mFirstPosition = pos + 1; |
| 676 | |
| 677 | return selectedView; |
| 678 | } |
| 679 | |
| 680 | /** |
| 681 | * Fills the list from top to bottom, starting with mFirstPosition |
| 682 | * |
| 683 | * @param nextTop The location where the top of the first item should be |
| 684 | * drawn |
| 685 | * |
| 686 | * @return The view that is currently selected |
| 687 | */ |
| 688 | private View fillFromTop(int nextTop) { |
| 689 | mFirstPosition = Math.min(mFirstPosition, mSelectedPosition); |
| 690 | mFirstPosition = Math.min(mFirstPosition, mItemCount - 1); |
| 691 | if (mFirstPosition < 0) { |
| 692 | mFirstPosition = 0; |
| 693 | } |
| 694 | return fillDown(mFirstPosition, nextTop); |
| 695 | } |
| 696 | |
| 697 | |
| 698 | /** |
| 699 | * Put mSelectedPosition in the middle of the screen and then build up and |
| 700 | * down from there. This method forces mSelectedPosition to the center. |
| 701 | * |
| 702 | * @param childrenTop Top of the area in which children can be drawn, as |
| 703 | * measured in pixels |
| 704 | * @param childrenBottom Bottom of the area in which children can be drawn, |
| 705 | * as measured in pixels |
| 706 | * @return Currently selected view |
| 707 | */ |
| 708 | private View fillFromMiddle(int childrenTop, int childrenBottom) { |
| 709 | int height = childrenBottom - childrenTop; |
| 710 | |
| 711 | int position = reconcileSelectedPosition(); |
| 712 | |
| 713 | View sel = makeAndAddView(position, childrenTop, true, |
| 714 | mListPadding.left, true); |
| 715 | mFirstPosition = position; |
| 716 | |
| 717 | int selHeight = sel.getMeasuredHeight(); |
| 718 | if (selHeight <= height) { |
| 719 | sel.offsetTopAndBottom((height - selHeight) / 2); |
| 720 | } |
| 721 | |
| 722 | fillAboveAndBelow(sel, position); |
| 723 | |
| 724 | if (!mStackFromBottom) { |
| 725 | correctTooHigh(getChildCount()); |
| 726 | } else { |
| 727 | correctTooLow(getChildCount()); |
| 728 | } |
| 729 | |
| 730 | return sel; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * Once the selected view as been placed, fill up the visible area above and |
| 735 | * below it. |
| 736 | * |
| 737 | * @param sel The selected view |
| 738 | * @param position The position corresponding to sel |
| 739 | */ |
| 740 | private void fillAboveAndBelow(View sel, int position) { |
| 741 | final int dividerHeight = mDividerHeight; |
| 742 | if (!mStackFromBottom) { |
| 743 | fillUp(position - 1, sel.getTop() - dividerHeight); |
| 744 | adjustViewsUpOrDown(); |
| 745 | fillDown(position + 1, sel.getBottom() + dividerHeight); |
| 746 | } else { |
| 747 | fillDown(position + 1, sel.getBottom() + dividerHeight); |
| 748 | adjustViewsUpOrDown(); |
| 749 | fillUp(position - 1, sel.getTop() - dividerHeight); |
| 750 | } |
| 751 | } |
| 752 | |
| 753 | |
| 754 | /** |
| 755 | * Fills the grid based on positioning the new selection at a specific |
| 756 | * location. The selection may be moved so that it does not intersect the |
| 757 | * faded edges. The grid is then filled upwards and downwards from there. |
| 758 | * |
| 759 | * @param selectedTop Where the selected item should be |
| 760 | * @param childrenTop Where to start drawing children |
| 761 | * @param childrenBottom Last pixel where children can be drawn |
| 762 | * @return The view that currently has selection |
| 763 | */ |
| 764 | private View fillFromSelection(int selectedTop, int childrenTop, int childrenBottom) { |
| 765 | int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 766 | final int selectedPosition = mSelectedPosition; |
| 767 | |
| 768 | View sel; |
| 769 | |
| 770 | final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, |
| 771 | selectedPosition); |
| 772 | final int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, fadingEdgeLength, |
| 773 | selectedPosition); |
| 774 | |
| 775 | sel = makeAndAddView(selectedPosition, selectedTop, true, mListPadding.left, true); |
| 776 | |
| 777 | |
| 778 | // Some of the newly selected item extends below the bottom of the list |
| 779 | if (sel.getBottom() > bottomSelectionPixel) { |
| 780 | // Find space available above the selection into which we can scroll |
| 781 | // upwards |
| 782 | final int spaceAbove = sel.getTop() - topSelectionPixel; |
| 783 | |
| 784 | // Find space required to bring the bottom of the selected item |
| 785 | // fully into view |
| 786 | final int spaceBelow = sel.getBottom() - bottomSelectionPixel; |
| 787 | final int offset = Math.min(spaceAbove, spaceBelow); |
| 788 | |
| 789 | // Now offset the selected item to get it into view |
| 790 | sel.offsetTopAndBottom(-offset); |
| 791 | } else if (sel.getTop() < topSelectionPixel) { |
| 792 | // Find space required to bring the top of the selected item fully |
| 793 | // into view |
| 794 | final int spaceAbove = topSelectionPixel - sel.getTop(); |
| 795 | |
| 796 | // Find space available below the selection into which we can scroll |
| 797 | // downwards |
| 798 | final int spaceBelow = bottomSelectionPixel - sel.getBottom(); |
| 799 | final int offset = Math.min(spaceAbove, spaceBelow); |
| 800 | |
| 801 | // Offset the selected item to get it into view |
| 802 | sel.offsetTopAndBottom(offset); |
| 803 | } |
| 804 | |
| 805 | // Fill in views above and below |
| 806 | fillAboveAndBelow(sel, selectedPosition); |
| 807 | |
| 808 | if (!mStackFromBottom) { |
| 809 | correctTooHigh(getChildCount()); |
| 810 | } else { |
| 811 | correctTooLow(getChildCount()); |
| 812 | } |
| 813 | |
| 814 | return sel; |
| 815 | } |
| 816 | |
| 817 | /** |
| 818 | * Calculate the bottom-most pixel we can draw the selection into |
| 819 | * |
| 820 | * @param childrenBottom Bottom pixel were children can be drawn |
| 821 | * @param fadingEdgeLength Length of the fading edge in pixels, if present |
| 822 | * @param selectedPosition The position that will be selected |
| 823 | * @return The bottom-most pixel we can draw the selection into |
| 824 | */ |
| 825 | private int getBottomSelectionPixel(int childrenBottom, int fadingEdgeLength, |
| 826 | int selectedPosition) { |
| 827 | int bottomSelectionPixel = childrenBottom; |
| 828 | if (selectedPosition != mItemCount - 1) { |
| 829 | bottomSelectionPixel -= fadingEdgeLength; |
| 830 | } |
| 831 | return bottomSelectionPixel; |
| 832 | } |
| 833 | |
| 834 | /** |
| 835 | * Calculate the top-most pixel we can draw the selection into |
| 836 | * |
| 837 | * @param childrenTop Top pixel were children can be drawn |
| 838 | * @param fadingEdgeLength Length of the fading edge in pixels, if present |
| 839 | * @param selectedPosition The position that will be selected |
| 840 | * @return The top-most pixel we can draw the selection into |
| 841 | */ |
| 842 | private int getTopSelectionPixel(int childrenTop, int fadingEdgeLength, int selectedPosition) { |
| 843 | // first pixel we can draw the selection into |
| 844 | int topSelectionPixel = childrenTop; |
| 845 | if (selectedPosition > 0) { |
| 846 | topSelectionPixel += fadingEdgeLength; |
| 847 | } |
| 848 | return topSelectionPixel; |
| 849 | } |
| 850 | |
| 851 | |
| 852 | /** |
| 853 | * Fills the list based on positioning the new selection relative to the old |
| 854 | * selection. The new selection will be placed at, above, or below the |
| 855 | * location of the new selection depending on how the selection is moving. |
| 856 | * The selection will then be pinned to the visible part of the screen, |
| 857 | * excluding the edges that are faded. The list is then filled upwards and |
| 858 | * downwards from there. |
| 859 | * |
| 860 | * @param oldSel The old selected view. Useful for trying to put the new |
| 861 | * selection in the same place |
| 862 | * @param newSel The view that is to become selected. Useful for trying to |
| 863 | * put the new selection in the same place |
| 864 | * @param delta Which way we are moving |
| 865 | * @param childrenTop Where to start drawing children |
| 866 | * @param childrenBottom Last pixel where children can be drawn |
| 867 | * @return The view that currently has selection |
| 868 | */ |
| 869 | private View moveSelection(View oldSel, View newSel, int delta, int childrenTop, |
| 870 | int childrenBottom) { |
| 871 | int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 872 | final int selectedPosition = mSelectedPosition; |
| 873 | |
| 874 | View sel; |
| 875 | |
| 876 | final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, |
| 877 | selectedPosition); |
| 878 | final int bottomSelectionPixel = getBottomSelectionPixel(childrenTop, fadingEdgeLength, |
| 879 | selectedPosition); |
| 880 | |
| 881 | if (delta > 0) { |
| 882 | /* |
| 883 | * Case 1: Scrolling down. |
| 884 | */ |
| 885 | |
| 886 | /* |
| 887 | * Before After |
| 888 | * | | | | |
| 889 | * +-------+ +-------+ |
| 890 | * | A | | A | |
| 891 | * | 1 | => +-------+ |
| 892 | * +-------+ | B | |
| 893 | * | B | | 2 | |
| 894 | * +-------+ +-------+ |
| 895 | * | | | | |
| 896 | * |
| 897 | * Try to keep the top of the previously selected item where it was. |
| 898 | * oldSel = A |
| 899 | * sel = B |
| 900 | */ |
| 901 | |
| 902 | // Put oldSel (A) where it belongs |
| 903 | oldSel = makeAndAddView(selectedPosition - 1, oldSel.getTop(), true, |
| 904 | mListPadding.left, false); |
| 905 | |
| 906 | final int dividerHeight = mDividerHeight; |
| 907 | |
| 908 | // Now put the new selection (B) below that |
| 909 | sel = makeAndAddView(selectedPosition, oldSel.getBottom() + dividerHeight, true, |
| 910 | mListPadding.left, true); |
| 911 | |
| 912 | // Some of the newly selected item extends below the bottom of the list |
| 913 | if (sel.getBottom() > bottomSelectionPixel) { |
| 914 | |
| 915 | // Find space available above the selection into which we can scroll upwards |
| 916 | int spaceAbove = sel.getTop() - topSelectionPixel; |
| 917 | |
| 918 | // Find space required to bring the bottom of the selected item fully into view |
| 919 | int spaceBelow = sel.getBottom() - bottomSelectionPixel; |
| 920 | |
| 921 | // Don't scroll more than half the height of the list |
| 922 | int halfVerticalSpace = (childrenBottom - childrenTop) / 2; |
| 923 | int offset = Math.min(spaceAbove, spaceBelow); |
| 924 | offset = Math.min(offset, halfVerticalSpace); |
| 925 | |
| 926 | // We placed oldSel, so offset that item |
| 927 | oldSel.offsetTopAndBottom(-offset); |
| 928 | // Now offset the selected item to get it into view |
| 929 | sel.offsetTopAndBottom(-offset); |
| 930 | } |
| 931 | |
| 932 | // Fill in views above and below |
| 933 | if (!mStackFromBottom) { |
| 934 | fillUp(mSelectedPosition - 2, sel.getTop() - dividerHeight); |
| 935 | adjustViewsUpOrDown(); |
| 936 | fillDown(mSelectedPosition + 1, sel.getBottom() + dividerHeight); |
| 937 | } else { |
| 938 | fillDown(mSelectedPosition + 1, sel.getBottom() + dividerHeight); |
| 939 | adjustViewsUpOrDown(); |
| 940 | fillUp(mSelectedPosition - 2, sel.getTop() - dividerHeight); |
| 941 | } |
| 942 | } else if (delta < 0) { |
| 943 | /* |
| 944 | * Case 2: Scrolling up. |
| 945 | */ |
| 946 | |
| 947 | /* |
| 948 | * Before After |
| 949 | * | | | | |
| 950 | * +-------+ +-------+ |
| 951 | * | A | | A | |
| 952 | * +-------+ => | 1 | |
| 953 | * | B | +-------+ |
| 954 | * | 2 | | B | |
| 955 | * +-------+ +-------+ |
| 956 | * | | | | |
| 957 | * |
| 958 | * Try to keep the top of the item about to become selected where it was. |
| 959 | * newSel = A |
| 960 | * olSel = B |
| 961 | */ |
| 962 | |
| 963 | if (newSel != null) { |
| 964 | // Try to position the top of newSel (A) where it was before it was selected |
| 965 | sel = makeAndAddView(selectedPosition, newSel.getTop(), true, mListPadding.left, |
| 966 | true); |
| 967 | } else { |
| 968 | // If (A) was not on screen and so did not have a view, position |
| 969 | // it above the oldSel (B) |
| 970 | sel = makeAndAddView(selectedPosition, oldSel.getTop(), false, mListPadding.left, |
| 971 | true); |
| 972 | } |
| 973 | |
| 974 | // Some of the newly selected item extends above the top of the list |
| 975 | if (sel.getTop() < topSelectionPixel) { |
| 976 | // Find space required to bring the top of the selected item fully into view |
| 977 | int spaceAbove = topSelectionPixel - sel.getTop(); |
| 978 | |
| 979 | // Find space available below the selection into which we can scroll downwards |
| 980 | int spaceBelow = bottomSelectionPixel - sel.getBottom(); |
| 981 | |
| 982 | // Don't scroll more than half the height of the list |
| 983 | int halfVerticalSpace = (childrenBottom - childrenTop) / 2; |
| 984 | int offset = Math.min(spaceAbove, spaceBelow); |
| 985 | offset = Math.min(offset, halfVerticalSpace); |
| 986 | |
| 987 | // Offset the selected item to get it into view |
| 988 | sel.offsetTopAndBottom(offset); |
| 989 | } |
| 990 | |
| 991 | // Fill in views above and below |
| 992 | fillAboveAndBelow(sel, selectedPosition); |
| 993 | } else { |
| 994 | |
| 995 | int oldTop = oldSel.getTop(); |
| 996 | |
| 997 | /* |
| 998 | * Case 3: Staying still |
| 999 | */ |
| 1000 | sel = makeAndAddView(selectedPosition, oldTop, true, mListPadding.left, true); |
| 1001 | |
| 1002 | // We're staying still... |
| 1003 | if (oldTop < childrenTop) { |
| 1004 | // ... but the top of the old selection was off screen. |
| 1005 | // (This can happen if the data changes size out from under us) |
| 1006 | int newBottom = sel.getBottom(); |
| 1007 | if (newBottom < childrenTop + 20) { |
| 1008 | // Not enough visible -- bring it onscreen |
| 1009 | sel.offsetTopAndBottom(childrenTop - sel.getTop()); |
| 1010 | } |
| 1011 | } |
| 1012 | |
| 1013 | // Fill in views above and below |
| 1014 | fillAboveAndBelow(sel, selectedPosition); |
| 1015 | } |
| 1016 | |
| 1017 | return sel; |
| 1018 | } |
| 1019 | |
| 1020 | @Override |
| 1021 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 1022 | // Sets up mListPadding |
| 1023 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| 1024 | |
| 1025 | int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| 1026 | int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| 1027 | int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
| 1028 | int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| 1029 | |
| 1030 | int childWidth = 0; |
| 1031 | int childHeight = 0; |
| 1032 | |
| 1033 | mItemCount = mAdapter == null ? 0 : mAdapter.getCount(); |
| 1034 | if (mItemCount > 0 && (widthMode == MeasureSpec.UNSPECIFIED || |
| 1035 | heightMode == MeasureSpec.UNSPECIFIED)) { |
| 1036 | final View child = obtainView(0); |
| 1037 | |
| 1038 | measureScrapChild(child, 0, widthMeasureSpec); |
| 1039 | |
| 1040 | childWidth = child.getMeasuredWidth(); |
| 1041 | childHeight = child.getMeasuredHeight(); |
| 1042 | |
| 1043 | if (recycleOnMeasure()) { |
| 1044 | mRecycler.addScrapView(child); |
| 1045 | } |
| 1046 | } |
| 1047 | |
| 1048 | if (widthMode == MeasureSpec.UNSPECIFIED) { |
| 1049 | widthSize = mListPadding.left + mListPadding.right + childWidth + |
| 1050 | getVerticalScrollbarWidth(); |
| 1051 | } |
| 1052 | |
| 1053 | if (heightMode == MeasureSpec.UNSPECIFIED) { |
| 1054 | heightSize = mListPadding.top + mListPadding.bottom + childHeight + |
| 1055 | getVerticalFadingEdgeLength() * 2; |
| 1056 | } |
| 1057 | |
| 1058 | if (heightMode == MeasureSpec.AT_MOST) { |
| 1059 | // TODO: after first layout we should maybe start at the first visible position, not 0 |
| 1060 | heightSize = measureHeightOfChildren(widthMeasureSpec, 0, NO_POSITION, heightSize, -1); |
| 1061 | } |
| 1062 | |
| 1063 | setMeasuredDimension(widthSize, heightSize); |
| 1064 | mWidthMeasureSpec = widthMeasureSpec; |
| 1065 | } |
| 1066 | |
| 1067 | private void measureScrapChild(View child, int position, int widthMeasureSpec) { |
| 1068 | LayoutParams p = (LayoutParams) child.getLayoutParams(); |
| 1069 | if (p == null) { |
| 1070 | p = new LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, |
| 1071 | ViewGroup.LayoutParams.WRAP_CONTENT, 0); |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 1072 | child.setLayoutParams(p); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1073 | } |
| 1074 | p.viewType = mAdapter.getItemViewType(position); |
| 1075 | |
| 1076 | int childWidthSpec = ViewGroup.getChildMeasureSpec(widthMeasureSpec, |
| 1077 | mListPadding.left + mListPadding.right, p.width); |
| 1078 | int lpHeight = p.height; |
| 1079 | int childHeightSpec; |
| 1080 | if (lpHeight > 0) { |
| 1081 | childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY); |
| 1082 | } else { |
| 1083 | childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| 1084 | } |
| 1085 | child.measure(childWidthSpec, childHeightSpec); |
| 1086 | } |
| 1087 | |
| 1088 | /** |
| 1089 | * @return True to recycle the views used to measure this ListView in |
| 1090 | * UNSPECIFIED/AT_MOST modes, false otherwise. |
| 1091 | * @hide |
| 1092 | */ |
Romain Guy | 986003d | 2009-03-25 17:42:35 -0700 | [diff] [blame] | 1093 | @ViewDebug.ExportedProperty |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1094 | protected boolean recycleOnMeasure() { |
| 1095 | return true; |
| 1096 | } |
| 1097 | |
| 1098 | /** |
| 1099 | * Measures the height of the given range of children (inclusive) and |
| 1100 | * returns the height with this ListView's padding and divider heights |
| 1101 | * included. If maxHeight is provided, the measuring will stop when the |
| 1102 | * current height reaches maxHeight. |
| 1103 | * |
| 1104 | * @param widthMeasureSpec The width measure spec to be given to a child's |
| 1105 | * {@link View#measure(int, int)}. |
| 1106 | * @param startPosition The position of the first child to be shown. |
| 1107 | * @param endPosition The (inclusive) position of the last child to be |
| 1108 | * shown. Specify {@link #NO_POSITION} if the last child should be |
| 1109 | * the last available child from the adapter. |
| 1110 | * @param maxHeight The maximum height that will be returned (if all the |
| 1111 | * children don't fit in this value, this value will be |
| 1112 | * returned). |
| 1113 | * @param disallowPartialChildPosition In general, whether the returned |
| 1114 | * height should only contain entire children. This is more |
| 1115 | * powerful--it is the first inclusive position at which partial |
| 1116 | * children will not be allowed. Example: it looks nice to have |
| 1117 | * at least 3 completely visible children, and in portrait this |
| 1118 | * will most likely fit; but in landscape there could be times |
| 1119 | * when even 2 children can not be completely shown, so a value |
| 1120 | * of 2 (remember, inclusive) would be good (assuming |
| 1121 | * startPosition is 0). |
| 1122 | * @return The height of this ListView with the given children. |
| 1123 | */ |
| 1124 | final int measureHeightOfChildren(int widthMeasureSpec, int startPosition, int endPosition, |
| 1125 | final int maxHeight, int disallowPartialChildPosition) { |
| 1126 | |
| 1127 | final ListAdapter adapter = mAdapter; |
| 1128 | if (adapter == null) { |
| 1129 | return mListPadding.top + mListPadding.bottom; |
| 1130 | } |
| 1131 | |
| 1132 | // Include the padding of the list |
| 1133 | int returnedHeight = mListPadding.top + mListPadding.bottom; |
| 1134 | final int dividerHeight = ((mDividerHeight > 0) && mDivider != null) ? mDividerHeight : 0; |
| 1135 | // The previous height value that was less than maxHeight and contained |
| 1136 | // no partial children |
| 1137 | int prevHeightWithoutPartialChild = 0; |
| 1138 | int i; |
| 1139 | View child; |
| 1140 | |
| 1141 | // mItemCount - 1 since endPosition parameter is inclusive |
| 1142 | endPosition = (endPosition == NO_POSITION) ? adapter.getCount() - 1 : endPosition; |
| 1143 | final AbsListView.RecycleBin recycleBin = mRecycler; |
| 1144 | final boolean recyle = recycleOnMeasure(); |
| 1145 | |
| 1146 | for (i = startPosition; i <= endPosition; ++i) { |
| 1147 | child = obtainView(i); |
| 1148 | |
| 1149 | measureScrapChild(child, i, widthMeasureSpec); |
| 1150 | |
| 1151 | if (i > 0) { |
| 1152 | // Count the divider for all but one child |
| 1153 | returnedHeight += dividerHeight; |
| 1154 | } |
| 1155 | |
| 1156 | // Recycle the view before we possibly return from the method |
| 1157 | if (recyle) { |
| 1158 | recycleBin.addScrapView(child); |
| 1159 | } |
| 1160 | |
| 1161 | returnedHeight += child.getMeasuredHeight(); |
| 1162 | |
| 1163 | if (returnedHeight >= maxHeight) { |
| 1164 | // We went over, figure out which height to return. If returnedHeight > maxHeight, |
| 1165 | // then the i'th position did not fit completely. |
| 1166 | return (disallowPartialChildPosition >= 0) // Disallowing is enabled (> -1) |
| 1167 | && (i > disallowPartialChildPosition) // We've past the min pos |
| 1168 | && (prevHeightWithoutPartialChild > 0) // We have a prev height |
| 1169 | && (returnedHeight != maxHeight) // i'th child did not fit completely |
| 1170 | ? prevHeightWithoutPartialChild |
| 1171 | : maxHeight; |
| 1172 | } |
| 1173 | |
| 1174 | if ((disallowPartialChildPosition >= 0) && (i >= disallowPartialChildPosition)) { |
| 1175 | prevHeightWithoutPartialChild = returnedHeight; |
| 1176 | } |
| 1177 | } |
| 1178 | |
| 1179 | // At this point, we went through the range of children, and they each |
| 1180 | // completely fit, so return the returnedHeight |
| 1181 | return returnedHeight; |
| 1182 | } |
| 1183 | |
| 1184 | @Override |
| 1185 | int findMotionRow(int y) { |
| 1186 | int childCount = getChildCount(); |
| 1187 | if (childCount > 0) { |
| 1188 | for (int i = 0; i < childCount; i++) { |
| 1189 | View v = getChildAt(i); |
| 1190 | if (y <= v.getBottom()) { |
| 1191 | return mFirstPosition + i; |
| 1192 | } |
| 1193 | } |
| 1194 | return mFirstPosition + childCount - 1; |
| 1195 | } |
| 1196 | return INVALID_POSITION; |
| 1197 | } |
| 1198 | |
| 1199 | /** |
| 1200 | * Put a specific item at a specific location on the screen and then build |
| 1201 | * up and down from there. |
| 1202 | * |
| 1203 | * @param position The reference view to use as the starting point |
| 1204 | * @param top Pixel offset from the top of this view to the top of the |
| 1205 | * reference view. |
| 1206 | * |
| 1207 | * @return The selected view, or null if the selected view is outside the |
| 1208 | * visible area. |
| 1209 | */ |
| 1210 | private View fillSpecific(int position, int top) { |
| 1211 | boolean tempIsSelected = position == mSelectedPosition; |
| 1212 | View temp = makeAndAddView(position, top, true, mListPadding.left, tempIsSelected); |
| 1213 | // Possibly changed again in fillUp if we add rows above this one. |
| 1214 | mFirstPosition = position; |
| 1215 | |
| 1216 | View above; |
| 1217 | View below; |
| 1218 | |
| 1219 | final int dividerHeight = mDividerHeight; |
| 1220 | if (!mStackFromBottom) { |
| 1221 | above = fillUp(position - 1, temp.getTop() - dividerHeight); |
| 1222 | // This will correct for the top of the first view not touching the top of the list |
| 1223 | adjustViewsUpOrDown(); |
| 1224 | below = fillDown(position + 1, temp.getBottom() + dividerHeight); |
| 1225 | int childCount = getChildCount(); |
| 1226 | if (childCount > 0) { |
| 1227 | correctTooHigh(childCount); |
| 1228 | } |
| 1229 | } else { |
| 1230 | below = fillDown(position + 1, temp.getBottom() + dividerHeight); |
| 1231 | // This will correct for the bottom of the last view not touching the bottom of the list |
| 1232 | adjustViewsUpOrDown(); |
| 1233 | above = fillUp(position - 1, temp.getTop() - dividerHeight); |
| 1234 | int childCount = getChildCount(); |
| 1235 | if (childCount > 0) { |
| 1236 | correctTooLow(childCount); |
| 1237 | } |
| 1238 | } |
| 1239 | |
| 1240 | if (tempIsSelected) { |
| 1241 | return temp; |
| 1242 | } else if (above != null) { |
| 1243 | return above; |
| 1244 | } else { |
| 1245 | return below; |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | /** |
| 1250 | * Check if we have dragged the bottom of the list too high (we have pushed the |
| 1251 | * top element off the top of the screen when we did not need to). Correct by sliding |
| 1252 | * everything back down. |
| 1253 | * |
| 1254 | * @param childCount Number of children |
| 1255 | */ |
| 1256 | private void correctTooHigh(int childCount) { |
| 1257 | // First see if the last item is visible. If it is not, it is OK for the |
| 1258 | // top of the list to be pushed up. |
| 1259 | int lastPosition = mFirstPosition + childCount - 1; |
| 1260 | if (lastPosition == mItemCount - 1 && childCount > 0) { |
| 1261 | |
| 1262 | // Get the last child ... |
| 1263 | final View lastChild = getChildAt(childCount - 1); |
| 1264 | |
| 1265 | // ... and its bottom edge |
| 1266 | final int lastBottom = lastChild.getBottom(); |
| 1267 | |
| 1268 | // This is bottom of our drawable area |
| 1269 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 1270 | |
| 1271 | // This is how far the bottom edge of the last view is from the bottom of the |
| 1272 | // drawable area |
| 1273 | int bottomOffset = end - lastBottom; |
| 1274 | View firstChild = getChildAt(0); |
| 1275 | final int firstTop = firstChild.getTop(); |
| 1276 | |
| 1277 | // Make sure we are 1) Too high, and 2) Either there are more rows above the |
| 1278 | // first row or the first row is scrolled off the top of the drawable area |
| 1279 | if (bottomOffset > 0 && (mFirstPosition > 0 || firstTop < mListPadding.top)) { |
| 1280 | if (mFirstPosition == 0) { |
| 1281 | // Don't pull the top too far down |
| 1282 | bottomOffset = Math.min(bottomOffset, mListPadding.top - firstTop); |
| 1283 | } |
| 1284 | // Move everything down |
| 1285 | offsetChildrenTopAndBottom(bottomOffset); |
| 1286 | if (mFirstPosition > 0) { |
| 1287 | // Fill the gap that was opened above mFirstPosition with more rows, if |
| 1288 | // possible |
| 1289 | fillUp(mFirstPosition - 1, firstChild.getTop() - mDividerHeight); |
| 1290 | // Close up the remaining gap |
| 1291 | adjustViewsUpOrDown(); |
| 1292 | } |
| 1293 | |
| 1294 | } |
| 1295 | } |
| 1296 | } |
| 1297 | |
| 1298 | /** |
| 1299 | * Check if we have dragged the bottom of the list too low (we have pushed the |
| 1300 | * bottom element off the bottom of the screen when we did not need to). Correct by sliding |
| 1301 | * everything back up. |
| 1302 | * |
| 1303 | * @param childCount Number of children |
| 1304 | */ |
| 1305 | private void correctTooLow(int childCount) { |
| 1306 | // First see if the first item is visible. If it is not, it is OK for the |
| 1307 | // bottom of the list to be pushed down. |
| 1308 | if (mFirstPosition == 0 && childCount > 0) { |
| 1309 | |
| 1310 | // Get the first child ... |
| 1311 | final View firstChild = getChildAt(0); |
| 1312 | |
| 1313 | // ... and its top edge |
| 1314 | final int firstTop = firstChild.getTop(); |
| 1315 | |
| 1316 | // This is top of our drawable area |
| 1317 | final int start = mListPadding.top; |
| 1318 | |
| 1319 | // This is bottom of our drawable area |
| 1320 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 1321 | |
| 1322 | // This is how far the top edge of the first view is from the top of the |
| 1323 | // drawable area |
| 1324 | int topOffset = firstTop - start; |
| 1325 | View lastChild = getChildAt(childCount - 1); |
| 1326 | final int lastBottom = lastChild.getBottom(); |
| 1327 | int lastPosition = mFirstPosition + childCount - 1; |
| 1328 | |
| 1329 | // Make sure we are 1) Too low, and 2) Either there are more rows below the |
| 1330 | // last row or the last row is scrolled off the bottom of the drawable area |
| 1331 | if (topOffset > 0 && (lastPosition < mItemCount - 1 || lastBottom > end)) { |
| 1332 | if (lastPosition == mItemCount - 1 ) { |
| 1333 | // Don't pull the bottom too far up |
| 1334 | topOffset = Math.min(topOffset, lastBottom - end); |
| 1335 | } |
| 1336 | // Move everything up |
| 1337 | offsetChildrenTopAndBottom(-topOffset); |
| 1338 | if (lastPosition < mItemCount - 1) { |
| 1339 | // Fill the gap that was opened below the last position with more rows, if |
| 1340 | // possible |
| 1341 | fillDown(lastPosition + 1, lastChild.getBottom() + mDividerHeight); |
| 1342 | // Close up the remaining gap |
| 1343 | adjustViewsUpOrDown(); |
| 1344 | } |
| 1345 | } |
| 1346 | } |
| 1347 | } |
| 1348 | |
| 1349 | @Override |
| 1350 | protected void layoutChildren() { |
| 1351 | final boolean blockLayoutRequests = mBlockLayoutRequests; |
| 1352 | if (!blockLayoutRequests) { |
| 1353 | mBlockLayoutRequests = true; |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 1354 | } else { |
| 1355 | return; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1356 | } |
| 1357 | |
| 1358 | try { |
| 1359 | super.layoutChildren(); |
| 1360 | |
| 1361 | invalidate(); |
| 1362 | |
| 1363 | if (mAdapter == null) { |
| 1364 | resetList(); |
| 1365 | invokeOnItemScrollListener(); |
| 1366 | return; |
| 1367 | } |
| 1368 | |
| 1369 | int childrenTop = mListPadding.top; |
| 1370 | int childrenBottom = mBottom - mTop - mListPadding.bottom; |
| 1371 | |
| 1372 | int childCount = getChildCount(); |
| 1373 | int index; |
| 1374 | int delta = 0; |
| 1375 | |
| 1376 | View sel; |
| 1377 | View oldSel = null; |
| 1378 | View oldFirst = null; |
| 1379 | View newSel = null; |
| 1380 | |
| 1381 | View focusLayoutRestoreView = null; |
| 1382 | |
| 1383 | // Remember stuff we will need down below |
| 1384 | switch (mLayoutMode) { |
| 1385 | case LAYOUT_SET_SELECTION: |
| 1386 | index = mNextSelectedPosition - mFirstPosition; |
| 1387 | if (index >= 0 && index < childCount) { |
| 1388 | newSel = getChildAt(index); |
| 1389 | } |
| 1390 | break; |
| 1391 | case LAYOUT_FORCE_TOP: |
| 1392 | case LAYOUT_FORCE_BOTTOM: |
| 1393 | case LAYOUT_SPECIFIC: |
| 1394 | case LAYOUT_SYNC: |
| 1395 | break; |
| 1396 | case LAYOUT_MOVE_SELECTION: |
| 1397 | default: |
| 1398 | // Remember the previously selected view |
| 1399 | index = mSelectedPosition - mFirstPosition; |
| 1400 | if (index >= 0 && index < childCount) { |
| 1401 | oldSel = getChildAt(index); |
| 1402 | } |
| 1403 | |
| 1404 | // Remember the previous first child |
| 1405 | oldFirst = getChildAt(0); |
| 1406 | |
| 1407 | if (mNextSelectedPosition >= 0) { |
| 1408 | delta = mNextSelectedPosition - mSelectedPosition; |
| 1409 | } |
| 1410 | |
| 1411 | // Caution: newSel might be null |
| 1412 | newSel = getChildAt(index + delta); |
| 1413 | } |
| 1414 | |
| 1415 | |
| 1416 | boolean dataChanged = mDataChanged; |
| 1417 | if (dataChanged) { |
| 1418 | handleDataChanged(); |
| 1419 | } |
| 1420 | |
| 1421 | // Handle the empty set by removing all views that are visible |
| 1422 | // and calling it a day |
| 1423 | if (mItemCount == 0) { |
| 1424 | resetList(); |
| 1425 | invokeOnItemScrollListener(); |
| 1426 | return; |
Romain Guy | b45f124 | 2009-03-24 21:30:00 -0700 | [diff] [blame] | 1427 | } else if (mItemCount != mAdapter.getCount()) { |
| 1428 | throw new IllegalStateException("The content of the adapter has changed but " |
| 1429 | + "ListView did not receive a notification. Make sure the content of " |
| 1430 | + "your adapter is not modified from a background thread, but only " |
| 1431 | + "from the UI thread."); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1432 | } |
| 1433 | |
| 1434 | setSelectedPositionInt(mNextSelectedPosition); |
| 1435 | |
| 1436 | // Pull all children into the RecycleBin. |
| 1437 | // These views will be reused if possible |
| 1438 | final int firstPosition = mFirstPosition; |
| 1439 | final RecycleBin recycleBin = mRecycler; |
| 1440 | |
| 1441 | // reset the focus restoration |
| 1442 | View focusLayoutRestoreDirectChild = null; |
| 1443 | |
| 1444 | |
| 1445 | // Don't put header or footer views into the Recycler. Those are |
| 1446 | // already cached in mHeaderViews; |
| 1447 | if (dataChanged) { |
| 1448 | for (int i = 0; i < childCount; i++) { |
| 1449 | recycleBin.addScrapView(getChildAt(i)); |
| 1450 | if (ViewDebug.TRACE_RECYCLER) { |
| 1451 | ViewDebug.trace(getChildAt(i), |
| 1452 | ViewDebug.RecyclerTraceType.MOVE_TO_SCRAP_HEAP, index, i); |
| 1453 | } |
| 1454 | } |
| 1455 | } else { |
| 1456 | recycleBin.fillActiveViews(childCount, firstPosition); |
| 1457 | } |
| 1458 | |
| 1459 | // take focus back to us temporarily to avoid the eventual |
| 1460 | // call to clear focus when removing the focused child below |
| 1461 | // from messing things up when ViewRoot assigns focus back |
| 1462 | // to someone else |
| 1463 | final View focusedChild = getFocusedChild(); |
| 1464 | if (focusedChild != null) { |
| 1465 | // TODO: in some cases focusedChild.getParent() == null |
| 1466 | |
| 1467 | // we can remember the focused view to restore after relayout if the |
| 1468 | // data hasn't changed, or if the focused position is a header or footer |
| 1469 | if (!dataChanged || isDirectChildHeaderOrFooter(focusedChild)) { |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 1470 | focusLayoutRestoreDirectChild = focusedChild; |
| 1471 | // remember the specific view that had focus |
| 1472 | focusLayoutRestoreView = findFocus(); |
| 1473 | if (focusLayoutRestoreView != null) { |
| 1474 | // tell it we are going to mess with it |
| 1475 | focusLayoutRestoreView.onStartTemporaryDetach(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1476 | } |
| 1477 | } |
| 1478 | requestFocus(); |
| 1479 | } |
| 1480 | |
| 1481 | // Clear out old views |
| 1482 | //removeAllViewsInLayout(); |
| 1483 | detachAllViewsFromParent(); |
| 1484 | |
| 1485 | switch (mLayoutMode) { |
| 1486 | case LAYOUT_SET_SELECTION: |
| 1487 | if (newSel != null) { |
| 1488 | sel = fillFromSelection(newSel.getTop(), childrenTop, childrenBottom); |
| 1489 | } else { |
| 1490 | sel = fillFromMiddle(childrenTop, childrenBottom); |
| 1491 | } |
| 1492 | break; |
| 1493 | case LAYOUT_SYNC: |
| 1494 | sel = fillSpecific(mSyncPosition, mSpecificTop); |
| 1495 | break; |
| 1496 | case LAYOUT_FORCE_BOTTOM: |
| 1497 | sel = fillUp(mItemCount - 1, childrenBottom); |
| 1498 | adjustViewsUpOrDown(); |
| 1499 | break; |
| 1500 | case LAYOUT_FORCE_TOP: |
| 1501 | mFirstPosition = 0; |
| 1502 | sel = fillFromTop(childrenTop); |
| 1503 | adjustViewsUpOrDown(); |
| 1504 | break; |
| 1505 | case LAYOUT_SPECIFIC: |
| 1506 | sel = fillSpecific(reconcileSelectedPosition(), mSpecificTop); |
| 1507 | break; |
| 1508 | case LAYOUT_MOVE_SELECTION: |
| 1509 | sel = moveSelection(oldSel, newSel, delta, childrenTop, childrenBottom); |
| 1510 | break; |
| 1511 | default: |
| 1512 | if (childCount == 0) { |
| 1513 | if (!mStackFromBottom) { |
| 1514 | final int position = lookForSelectablePosition(0, true); |
| 1515 | setSelectedPositionInt(position); |
| 1516 | sel = fillFromTop(childrenTop); |
| 1517 | } else { |
| 1518 | final int position = lookForSelectablePosition(mItemCount - 1, false); |
| 1519 | setSelectedPositionInt(position); |
| 1520 | sel = fillUp(mItemCount - 1, childrenBottom); |
| 1521 | } |
| 1522 | } else { |
| 1523 | if (mSelectedPosition >= 0 && mSelectedPosition < mItemCount) { |
| 1524 | sel = fillSpecific(mSelectedPosition, |
| 1525 | oldSel == null ? childrenTop : oldSel.getTop()); |
| 1526 | } else if (mFirstPosition < mItemCount) { |
| 1527 | sel = fillSpecific(mFirstPosition, |
| 1528 | oldFirst == null ? childrenTop : oldFirst.getTop()); |
| 1529 | } else { |
| 1530 | sel = fillSpecific(0, childrenTop); |
| 1531 | } |
| 1532 | } |
| 1533 | break; |
| 1534 | } |
| 1535 | |
| 1536 | // Flush any cached views that did not get reused above |
| 1537 | recycleBin.scrapActiveViews(); |
| 1538 | |
| 1539 | if (sel != null) { |
| 1540 | // the current selected item should get focus if items |
| 1541 | // are focusable |
| 1542 | if (mItemsCanFocus && hasFocus() && !sel.hasFocus()) { |
| 1543 | final boolean focusWasTaken = (sel == focusLayoutRestoreDirectChild && |
| 1544 | focusLayoutRestoreView.requestFocus()) || sel.requestFocus(); |
| 1545 | if (!focusWasTaken) { |
| 1546 | // selected item didn't take focus, fine, but still want |
| 1547 | // to make sure something else outside of the selected view |
| 1548 | // has focus |
| 1549 | final View focused = getFocusedChild(); |
| 1550 | if (focused != null) { |
| 1551 | focused.clearFocus(); |
| 1552 | } |
| 1553 | positionSelector(sel); |
| 1554 | } else { |
| 1555 | sel.setSelected(false); |
| 1556 | mSelectorRect.setEmpty(); |
| 1557 | } |
| 1558 | } else { |
| 1559 | positionSelector(sel); |
| 1560 | } |
| 1561 | mSelectedTop = sel.getTop(); |
| 1562 | } else { |
| 1563 | mSelectedTop = 0; |
| 1564 | mSelectorRect.setEmpty(); |
| 1565 | |
| 1566 | // even if there is not selected position, we may need to restore |
| 1567 | // focus (i.e. something focusable in touch mode) |
| 1568 | if (hasFocus() && focusLayoutRestoreView != null) { |
| 1569 | focusLayoutRestoreView.requestFocus(); |
| 1570 | } |
| 1571 | } |
| 1572 | |
| 1573 | // tell focus view we are done mucking with it, if it is still in |
| 1574 | // our view hierarchy. |
| 1575 | if (focusLayoutRestoreView != null |
| 1576 | && focusLayoutRestoreView.getWindowToken() != null) { |
| 1577 | focusLayoutRestoreView.onFinishTemporaryDetach(); |
| 1578 | } |
| 1579 | |
| 1580 | mLayoutMode = LAYOUT_NORMAL; |
| 1581 | mDataChanged = false; |
| 1582 | mNeedSync = false; |
| 1583 | setNextSelectedPositionInt(mSelectedPosition); |
| 1584 | |
| 1585 | updateScrollIndicators(); |
| 1586 | |
| 1587 | if (mItemCount > 0) { |
| 1588 | checkSelectionChanged(); |
| 1589 | } |
| 1590 | |
| 1591 | invokeOnItemScrollListener(); |
| 1592 | } finally { |
| 1593 | if (!blockLayoutRequests) { |
| 1594 | mBlockLayoutRequests = false; |
| 1595 | } |
| 1596 | } |
| 1597 | } |
| 1598 | |
| 1599 | /** |
| 1600 | * @param child a direct child of this list. |
| 1601 | * @return Whether child is a header or footer view. |
| 1602 | */ |
| 1603 | private boolean isDirectChildHeaderOrFooter(View child) { |
| 1604 | |
| 1605 | final ArrayList<FixedViewInfo> headers = mHeaderViewInfos; |
| 1606 | final int numHeaders = headers.size(); |
| 1607 | for (int i = 0; i < numHeaders; i++) { |
| 1608 | if (child == headers.get(i).view) { |
| 1609 | return true; |
| 1610 | } |
| 1611 | } |
| 1612 | final ArrayList<FixedViewInfo> footers = mFooterViewInfos; |
| 1613 | final int numFooters = footers.size(); |
| 1614 | for (int i = 0; i < numFooters; i++) { |
| 1615 | if (child == footers.get(i).view) { |
| 1616 | return true; |
| 1617 | } |
| 1618 | } |
| 1619 | return false; |
| 1620 | } |
| 1621 | |
| 1622 | /** |
| 1623 | * Obtain the view and add it to our list of children. The view can be made |
| 1624 | * fresh, converted from an unused view, or used as is if it was in the |
| 1625 | * recycle bin. |
| 1626 | * |
| 1627 | * @param position Logical position in the list |
| 1628 | * @param y Top or bottom edge of the view to add |
| 1629 | * @param flow If flow is true, align top edge to y. If false, align bottom |
| 1630 | * edge to y. |
| 1631 | * @param childrenLeft Left edge where children should be positioned |
| 1632 | * @param selected Is this position selected? |
| 1633 | * @return View that was added |
| 1634 | */ |
| 1635 | private View makeAndAddView(int position, int y, boolean flow, int childrenLeft, |
| 1636 | boolean selected) { |
| 1637 | View child; |
| 1638 | |
| 1639 | |
| 1640 | if (!mDataChanged) { |
| 1641 | // Try to use an exsiting view for this position |
| 1642 | child = mRecycler.getActiveView(position); |
| 1643 | if (child != null) { |
| 1644 | if (ViewDebug.TRACE_RECYCLER) { |
| 1645 | ViewDebug.trace(child, ViewDebug.RecyclerTraceType.RECYCLE_FROM_ACTIVE_HEAP, |
| 1646 | position, getChildCount()); |
| 1647 | } |
| 1648 | |
| 1649 | // Found it -- we're using an existing child |
| 1650 | // This just needs to be positioned |
| 1651 | setupChild(child, position, y, flow, childrenLeft, selected, true); |
| 1652 | |
| 1653 | return child; |
| 1654 | } |
| 1655 | } |
| 1656 | |
| 1657 | // Make a new view for this position, or convert an unused view if possible |
| 1658 | child = obtainView(position); |
| 1659 | |
| 1660 | // This needs to be positioned and measured |
| 1661 | setupChild(child, position, y, flow, childrenLeft, selected, false); |
| 1662 | |
| 1663 | return child; |
| 1664 | } |
| 1665 | |
| 1666 | /** |
| 1667 | * Add a view as a child and make sure it is measured (if necessary) and |
| 1668 | * positioned properly. |
| 1669 | * |
| 1670 | * @param child The view to add |
| 1671 | * @param position The position of this child |
| 1672 | * @param y The y position relative to which this view will be positioned |
| 1673 | * @param flowDown If true, align top edge to y. If false, align bottom |
| 1674 | * edge to y. |
| 1675 | * @param childrenLeft Left edge where children should be positioned |
| 1676 | * @param selected Is this position selected? |
| 1677 | * @param recycled Has this view been pulled from the recycle bin? If so it |
| 1678 | * does not need to be remeasured. |
| 1679 | */ |
| 1680 | private void setupChild(View child, int position, int y, boolean flowDown, int childrenLeft, |
| 1681 | boolean selected, boolean recycled) { |
| 1682 | final boolean isSelected = selected && shouldShowSelector(); |
| 1683 | final boolean updateChildSelected = isSelected != child.isSelected(); |
| 1684 | final boolean needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested(); |
| 1685 | |
| 1686 | // Respect layout params that are already in the view. Otherwise make some up... |
| 1687 | // noinspection unchecked |
| 1688 | AbsListView.LayoutParams p = (AbsListView.LayoutParams) child.getLayoutParams(); |
| 1689 | if (p == null) { |
| 1690 | p = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, |
| 1691 | ViewGroup.LayoutParams.WRAP_CONTENT, 0); |
| 1692 | } |
| 1693 | p.viewType = mAdapter.getItemViewType(position); |
| 1694 | |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 1695 | if (recycled || (p.recycledHeaderFooter && |
| 1696 | p.viewType == AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER)) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1697 | attachViewToParent(child, flowDown ? -1 : 0, p); |
| 1698 | } else { |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 1699 | if (p.viewType == AdapterView.ITEM_VIEW_TYPE_HEADER_OR_FOOTER) { |
| 1700 | p.recycledHeaderFooter = true; |
| 1701 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1702 | addViewInLayout(child, flowDown ? -1 : 0, p, true); |
| 1703 | } |
| 1704 | |
| 1705 | if (updateChildSelected) { |
| 1706 | child.setSelected(isSelected); |
| 1707 | } |
| 1708 | |
| 1709 | if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) { |
| 1710 | if (child instanceof Checkable) { |
| 1711 | ((Checkable) child).setChecked(mCheckStates.get(position)); |
| 1712 | } |
| 1713 | } |
| 1714 | |
| 1715 | if (needToMeasure) { |
| 1716 | int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec, |
| 1717 | mListPadding.left + mListPadding.right, p.width); |
| 1718 | int lpHeight = p.height; |
| 1719 | int childHeightSpec; |
| 1720 | if (lpHeight > 0) { |
| 1721 | childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY); |
| 1722 | } else { |
| 1723 | childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| 1724 | } |
| 1725 | child.measure(childWidthSpec, childHeightSpec); |
| 1726 | } else { |
| 1727 | cleanupLayoutState(child); |
| 1728 | } |
| 1729 | |
| 1730 | final int w = child.getMeasuredWidth(); |
| 1731 | final int h = child.getMeasuredHeight(); |
| 1732 | final int childTop = flowDown ? y : y - h; |
| 1733 | |
| 1734 | if (needToMeasure) { |
| 1735 | final int childRight = childrenLeft + w; |
| 1736 | final int childBottom = childTop + h; |
| 1737 | child.layout(childrenLeft, childTop, childRight, childBottom); |
| 1738 | } else { |
| 1739 | child.offsetLeftAndRight(childrenLeft - child.getLeft()); |
| 1740 | child.offsetTopAndBottom(childTop - child.getTop()); |
| 1741 | } |
| 1742 | |
| 1743 | if (mCachingStarted && !child.isDrawingCacheEnabled()) { |
| 1744 | child.setDrawingCacheEnabled(true); |
| 1745 | } |
| 1746 | } |
| 1747 | |
| 1748 | @Override |
| 1749 | protected boolean canAnimate() { |
| 1750 | return super.canAnimate() && mItemCount > 0; |
| 1751 | } |
| 1752 | |
| 1753 | /** |
| 1754 | * Sets the currently selected item. If in touch mode, the item will not be selected |
| 1755 | * but it will still be positioned appropriately. If the specified selection position |
| 1756 | * is less than 0, then the item at position 0 will be selected. |
| 1757 | * |
| 1758 | * @param position Index (starting at 0) of the data item to be selected. |
| 1759 | */ |
| 1760 | @Override |
| 1761 | public void setSelection(int position) { |
| 1762 | setSelectionFromTop(position, 0); |
| 1763 | } |
| 1764 | |
| 1765 | /** |
| 1766 | * Sets the selected item and positions the selection y pixels from the top edge |
| 1767 | * of the ListView. (If in touch mode, the item will not be selected but it will |
| 1768 | * still be positioned appropriately.) |
| 1769 | * |
| 1770 | * @param position Index (starting at 0) of the data item to be selected. |
| 1771 | * @param y The distance from the top edge of the ListView (plus padding) that the |
| 1772 | * item will be positioned. |
| 1773 | */ |
| 1774 | public void setSelectionFromTop(int position, int y) { |
| 1775 | if (mAdapter == null) { |
| 1776 | return; |
| 1777 | } |
| 1778 | |
| 1779 | if (!isInTouchMode()) { |
| 1780 | position = lookForSelectablePosition(position, true); |
| 1781 | if (position >= 0) { |
| 1782 | setNextSelectedPositionInt(position); |
| 1783 | } |
| 1784 | } else { |
| 1785 | mResurrectToPosition = position; |
| 1786 | } |
| 1787 | |
| 1788 | if (position >= 0) { |
| 1789 | mLayoutMode = LAYOUT_SPECIFIC; |
| 1790 | mSpecificTop = mListPadding.top + y; |
| 1791 | |
| 1792 | if (mNeedSync) { |
| 1793 | mSyncPosition = position; |
| 1794 | mSyncRowId = mAdapter.getItemId(position); |
| 1795 | } |
| 1796 | |
| 1797 | requestLayout(); |
| 1798 | } |
| 1799 | } |
| 1800 | |
| 1801 | /** |
| 1802 | * Makes the item at the supplied position selected. |
| 1803 | * |
| 1804 | * @param position the position of the item to select |
| 1805 | */ |
| 1806 | @Override |
| 1807 | void setSelectionInt(int position) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1808 | setNextSelectedPositionInt(position); |
| 1809 | layoutChildren(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1810 | } |
| 1811 | |
| 1812 | /** |
| 1813 | * Find a position that can be selected (i.e., is not a separator). |
| 1814 | * |
| 1815 | * @param position The starting position to look at. |
| 1816 | * @param lookDown Whether to look down for other positions. |
| 1817 | * @return The next selectable position starting at position and then searching either up or |
| 1818 | * down. Returns {@link #INVALID_POSITION} if nothing can be found. |
| 1819 | */ |
| 1820 | @Override |
| 1821 | int lookForSelectablePosition(int position, boolean lookDown) { |
| 1822 | final ListAdapter adapter = mAdapter; |
| 1823 | if (adapter == null || isInTouchMode()) { |
| 1824 | return INVALID_POSITION; |
| 1825 | } |
| 1826 | |
| 1827 | final int count = adapter.getCount(); |
| 1828 | if (!mAreAllItemsSelectable) { |
| 1829 | if (lookDown) { |
| 1830 | position = Math.max(0, position); |
| 1831 | while (position < count && !adapter.isEnabled(position)) { |
| 1832 | position++; |
| 1833 | } |
| 1834 | } else { |
| 1835 | position = Math.min(position, count - 1); |
| 1836 | while (position >= 0 && !adapter.isEnabled(position)) { |
| 1837 | position--; |
| 1838 | } |
| 1839 | } |
| 1840 | |
| 1841 | if (position < 0 || position >= count) { |
| 1842 | return INVALID_POSITION; |
| 1843 | } |
| 1844 | return position; |
| 1845 | } else { |
| 1846 | if (position < 0 || position >= count) { |
| 1847 | return INVALID_POSITION; |
| 1848 | } |
| 1849 | return position; |
| 1850 | } |
| 1851 | } |
| 1852 | |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 1853 | @Override |
| 1854 | public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { |
| 1855 | boolean populated = super.dispatchPopulateAccessibilityEvent(event); |
| 1856 | |
Amith Yamasani | d296faf | 2009-06-04 12:11:25 -0700 | [diff] [blame] | 1857 | // If the item count is less than 15 then subtract disabled items from the count and |
| 1858 | // position. Otherwise ignore disabled items. |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 1859 | if (!populated) { |
| 1860 | int itemCount = 0; |
| 1861 | int currentItemIndex = getSelectedItemPosition(); |
| 1862 | |
| 1863 | ListAdapter adapter = getAdapter(); |
| 1864 | if (adapter != null) { |
Amith Yamasani | d296faf | 2009-06-04 12:11:25 -0700 | [diff] [blame] | 1865 | final int count = adapter.getCount(); |
| 1866 | if (count < 15) { |
| 1867 | for (int i = 0; i < count; i++) { |
| 1868 | if (adapter.isEnabled(i)) { |
| 1869 | itemCount++; |
| 1870 | } else if (i <= currentItemIndex) { |
| 1871 | currentItemIndex--; |
| 1872 | } |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 1873 | } |
Amith Yamasani | d296faf | 2009-06-04 12:11:25 -0700 | [diff] [blame] | 1874 | } else { |
| 1875 | itemCount = count; |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 1876 | } |
| 1877 | } |
| 1878 | |
| 1879 | event.setItemCount(itemCount); |
| 1880 | event.setCurrentItemIndex(currentItemIndex); |
| 1881 | } |
| 1882 | |
| 1883 | return populated; |
| 1884 | } |
| 1885 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1886 | /** |
| 1887 | * setSelectionAfterHeaderView set the selection to be the first list item |
| 1888 | * after the header views. |
| 1889 | */ |
| 1890 | public void setSelectionAfterHeaderView() { |
| 1891 | final int count = mHeaderViewInfos.size(); |
| 1892 | if (count > 0) { |
| 1893 | mNextSelectedPosition = 0; |
| 1894 | return; |
| 1895 | } |
| 1896 | |
| 1897 | if (mAdapter != null) { |
| 1898 | setSelection(count); |
| 1899 | } else { |
| 1900 | mNextSelectedPosition = count; |
| 1901 | mLayoutMode = LAYOUT_SET_SELECTION; |
| 1902 | } |
| 1903 | |
| 1904 | } |
| 1905 | |
| 1906 | @Override |
| 1907 | public boolean dispatchKeyEvent(KeyEvent event) { |
| 1908 | // Dispatch in the normal way |
| 1909 | boolean handled = super.dispatchKeyEvent(event); |
| 1910 | if (!handled) { |
| 1911 | // If we didn't handle it... |
| 1912 | View focused = getFocusedChild(); |
| 1913 | if (focused != null && event.getAction() == KeyEvent.ACTION_DOWN) { |
| 1914 | // ... and our focused child didn't handle it |
| 1915 | // ... give it to ourselves so we can scroll if necessary |
| 1916 | handled = onKeyDown(event.getKeyCode(), event); |
| 1917 | } |
| 1918 | } |
| 1919 | return handled; |
| 1920 | } |
| 1921 | |
| 1922 | @Override |
| 1923 | public boolean onKeyDown(int keyCode, KeyEvent event) { |
| 1924 | return commonKey(keyCode, 1, event); |
| 1925 | } |
| 1926 | |
| 1927 | @Override |
| 1928 | public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { |
| 1929 | return commonKey(keyCode, repeatCount, event); |
| 1930 | } |
| 1931 | |
| 1932 | @Override |
| 1933 | public boolean onKeyUp(int keyCode, KeyEvent event) { |
| 1934 | return commonKey(keyCode, 1, event); |
| 1935 | } |
| 1936 | |
| 1937 | private boolean commonKey(int keyCode, int count, KeyEvent event) { |
| 1938 | if (mAdapter == null) { |
| 1939 | return false; |
| 1940 | } |
| 1941 | |
| 1942 | if (mDataChanged) { |
| 1943 | layoutChildren(); |
| 1944 | } |
| 1945 | |
| 1946 | boolean handled = false; |
| 1947 | int action = event.getAction(); |
| 1948 | |
| 1949 | if (action != KeyEvent.ACTION_UP) { |
| 1950 | if (mSelectedPosition < 0) { |
| 1951 | switch (keyCode) { |
| 1952 | case KeyEvent.KEYCODE_DPAD_UP: |
| 1953 | case KeyEvent.KEYCODE_DPAD_DOWN: |
| 1954 | case KeyEvent.KEYCODE_DPAD_CENTER: |
| 1955 | case KeyEvent.KEYCODE_ENTER: |
| 1956 | case KeyEvent.KEYCODE_SPACE: |
| 1957 | if (resurrectSelection()) { |
| 1958 | return true; |
| 1959 | } |
| 1960 | } |
| 1961 | } |
| 1962 | switch (keyCode) { |
| 1963 | case KeyEvent.KEYCODE_DPAD_UP: |
| 1964 | if (!event.isAltPressed()) { |
| 1965 | while (count > 0) { |
| 1966 | handled = arrowScroll(FOCUS_UP); |
| 1967 | count--; |
| 1968 | } |
| 1969 | } else { |
| 1970 | handled = fullScroll(FOCUS_UP); |
| 1971 | } |
| 1972 | break; |
| 1973 | |
| 1974 | case KeyEvent.KEYCODE_DPAD_DOWN: |
| 1975 | if (!event.isAltPressed()) { |
| 1976 | while (count > 0) { |
| 1977 | handled = arrowScroll(FOCUS_DOWN); |
| 1978 | count--; |
| 1979 | } |
| 1980 | } else { |
| 1981 | handled = fullScroll(FOCUS_DOWN); |
| 1982 | } |
| 1983 | break; |
| 1984 | |
| 1985 | case KeyEvent.KEYCODE_DPAD_LEFT: |
| 1986 | handled = handleHorizontalFocusWithinListItem(View.FOCUS_LEFT); |
| 1987 | break; |
| 1988 | case KeyEvent.KEYCODE_DPAD_RIGHT: |
| 1989 | handled = handleHorizontalFocusWithinListItem(View.FOCUS_RIGHT); |
| 1990 | break; |
| 1991 | |
| 1992 | case KeyEvent.KEYCODE_DPAD_CENTER: |
| 1993 | case KeyEvent.KEYCODE_ENTER: |
| 1994 | if (mItemCount > 0 && event.getRepeatCount() == 0) { |
| 1995 | keyPressed(); |
| 1996 | } |
| 1997 | handled = true; |
| 1998 | break; |
| 1999 | |
| 2000 | case KeyEvent.KEYCODE_SPACE: |
| 2001 | if (mPopup == null || !mPopup.isShowing()) { |
| 2002 | if (!event.isShiftPressed()) { |
| 2003 | pageScroll(FOCUS_DOWN); |
| 2004 | } else { |
| 2005 | pageScroll(FOCUS_UP); |
| 2006 | } |
| 2007 | handled = true; |
| 2008 | } |
| 2009 | break; |
| 2010 | } |
| 2011 | } |
| 2012 | |
| 2013 | if (!handled) { |
| 2014 | handled = sendToTextFilter(keyCode, count, event); |
| 2015 | } |
| 2016 | |
| 2017 | if (handled) { |
| 2018 | return true; |
| 2019 | } else { |
| 2020 | switch (action) { |
| 2021 | case KeyEvent.ACTION_DOWN: |
| 2022 | return super.onKeyDown(keyCode, event); |
| 2023 | |
| 2024 | case KeyEvent.ACTION_UP: |
| 2025 | return super.onKeyUp(keyCode, event); |
| 2026 | |
| 2027 | case KeyEvent.ACTION_MULTIPLE: |
| 2028 | return super.onKeyMultiple(keyCode, count, event); |
| 2029 | |
| 2030 | default: // shouldn't happen |
| 2031 | return false; |
| 2032 | } |
| 2033 | } |
| 2034 | } |
| 2035 | |
| 2036 | /** |
| 2037 | * Scrolls up or down by the number of items currently present on screen. |
| 2038 | * |
| 2039 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 2040 | * @return whether selection was moved |
| 2041 | */ |
| 2042 | boolean pageScroll(int direction) { |
| 2043 | int nextPage = -1; |
| 2044 | boolean down = false; |
| 2045 | |
| 2046 | if (direction == FOCUS_UP) { |
| 2047 | nextPage = Math.max(0, mSelectedPosition - getChildCount() - 1); |
| 2048 | } else if (direction == FOCUS_DOWN) { |
| 2049 | nextPage = Math.min(mItemCount - 1, mSelectedPosition + getChildCount() - 1); |
| 2050 | down = true; |
| 2051 | } |
| 2052 | |
| 2053 | if (nextPage >= 0) { |
| 2054 | int position = lookForSelectablePosition(nextPage, down); |
| 2055 | if (position >= 0) { |
| 2056 | mLayoutMode = LAYOUT_SPECIFIC; |
| 2057 | mSpecificTop = mPaddingTop + getVerticalFadingEdgeLength(); |
| 2058 | |
| 2059 | if (down && position > mItemCount - getChildCount()) { |
| 2060 | mLayoutMode = LAYOUT_FORCE_BOTTOM; |
| 2061 | } |
| 2062 | |
| 2063 | if (!down && position < getChildCount()) { |
| 2064 | mLayoutMode = LAYOUT_FORCE_TOP; |
| 2065 | } |
| 2066 | |
| 2067 | setSelectionInt(position); |
| 2068 | invokeOnItemScrollListener(); |
| 2069 | invalidate(); |
| 2070 | |
| 2071 | return true; |
| 2072 | } |
| 2073 | } |
| 2074 | |
| 2075 | return false; |
| 2076 | } |
| 2077 | |
| 2078 | /** |
| 2079 | * Go to the last or first item if possible (not worrying about panning across or navigating |
| 2080 | * within the internal focus of the currently selected item.) |
| 2081 | * |
| 2082 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 2083 | * |
| 2084 | * @return whether selection was moved |
| 2085 | */ |
| 2086 | boolean fullScroll(int direction) { |
| 2087 | boolean moved = false; |
| 2088 | if (direction == FOCUS_UP) { |
| 2089 | if (mSelectedPosition != 0) { |
| 2090 | int position = lookForSelectablePosition(0, true); |
| 2091 | if (position >= 0) { |
| 2092 | mLayoutMode = LAYOUT_FORCE_TOP; |
| 2093 | setSelectionInt(position); |
| 2094 | invokeOnItemScrollListener(); |
| 2095 | } |
| 2096 | moved = true; |
| 2097 | } |
| 2098 | } else if (direction == FOCUS_DOWN) { |
| 2099 | if (mSelectedPosition < mItemCount - 1) { |
| 2100 | int position = lookForSelectablePosition(mItemCount - 1, true); |
| 2101 | if (position >= 0) { |
| 2102 | mLayoutMode = LAYOUT_FORCE_BOTTOM; |
| 2103 | setSelectionInt(position); |
| 2104 | invokeOnItemScrollListener(); |
| 2105 | } |
| 2106 | moved = true; |
| 2107 | } |
| 2108 | } |
| 2109 | |
| 2110 | if (moved) { |
| 2111 | invalidate(); |
| 2112 | } |
| 2113 | |
| 2114 | return moved; |
| 2115 | } |
| 2116 | |
| 2117 | /** |
| 2118 | * To avoid horizontal focus searches changing the selected item, we |
| 2119 | * manually focus search within the selected item (as applicable), and |
| 2120 | * prevent focus from jumping to something within another item. |
| 2121 | * @param direction one of {View.FOCUS_LEFT, View.FOCUS_RIGHT} |
| 2122 | * @return Whether this consumes the key event. |
| 2123 | */ |
| 2124 | private boolean handleHorizontalFocusWithinListItem(int direction) { |
| 2125 | if (direction != View.FOCUS_LEFT && direction != View.FOCUS_RIGHT) { |
Romain Guy | 304eefa | 2009-03-24 20:01:49 -0700 | [diff] [blame] | 2126 | throw new IllegalArgumentException("direction must be one of" |
| 2127 | + " {View.FOCUS_LEFT, View.FOCUS_RIGHT}"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2128 | } |
| 2129 | |
| 2130 | final int numChildren = getChildCount(); |
| 2131 | if (mItemsCanFocus && numChildren > 0 && mSelectedPosition != INVALID_POSITION) { |
| 2132 | final View selectedView = getSelectedView(); |
Romain Guy | 304eefa | 2009-03-24 20:01:49 -0700 | [diff] [blame] | 2133 | if (selectedView != null && selectedView.hasFocus() && |
| 2134 | selectedView instanceof ViewGroup) { |
| 2135 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2136 | final View currentFocus = selectedView.findFocus(); |
| 2137 | final View nextFocus = FocusFinder.getInstance().findNextFocus( |
Romain Guy | 304eefa | 2009-03-24 20:01:49 -0700 | [diff] [blame] | 2138 | (ViewGroup) selectedView, currentFocus, direction); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2139 | if (nextFocus != null) { |
| 2140 | // do the math to get interesting rect in next focus' coordinates |
| 2141 | currentFocus.getFocusedRect(mTempRect); |
| 2142 | offsetDescendantRectToMyCoords(currentFocus, mTempRect); |
| 2143 | offsetRectIntoDescendantCoords(nextFocus, mTempRect); |
| 2144 | if (nextFocus.requestFocus(direction, mTempRect)) { |
| 2145 | return true; |
| 2146 | } |
| 2147 | } |
| 2148 | // we are blocking the key from being handled (by returning true) |
| 2149 | // if the global result is going to be some other view within this |
| 2150 | // list. this is to acheive the overall goal of having |
| 2151 | // horizontal d-pad navigation remain in the current item. |
Romain Guy | 304eefa | 2009-03-24 20:01:49 -0700 | [diff] [blame] | 2152 | final View globalNextFocus = FocusFinder.getInstance().findNextFocus( |
| 2153 | (ViewGroup) getRootView(), currentFocus, direction); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2154 | if (globalNextFocus != null) { |
| 2155 | return isViewAncestorOf(globalNextFocus, this); |
| 2156 | } |
| 2157 | } |
| 2158 | } |
| 2159 | return false; |
| 2160 | } |
| 2161 | |
| 2162 | /** |
| 2163 | * Scrolls to the next or previous item if possible. |
| 2164 | * |
| 2165 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 2166 | * |
| 2167 | * @return whether selection was moved |
| 2168 | */ |
| 2169 | boolean arrowScroll(int direction) { |
| 2170 | try { |
| 2171 | mInLayout = true; |
| 2172 | final boolean handled = arrowScrollImpl(direction); |
| 2173 | if (handled) { |
| 2174 | playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction)); |
| 2175 | } |
| 2176 | return handled; |
| 2177 | } finally { |
| 2178 | mInLayout = false; |
| 2179 | } |
| 2180 | } |
| 2181 | |
| 2182 | /** |
| 2183 | * Handle an arrow scroll going up or down. Take into account whether items are selectable, |
| 2184 | * whether there are focusable items etc. |
| 2185 | * |
| 2186 | * @param direction Either {@link android.view.View#FOCUS_UP} or {@link android.view.View#FOCUS_DOWN}. |
| 2187 | * @return Whether any scrolling, selection or focus change occured. |
| 2188 | */ |
| 2189 | private boolean arrowScrollImpl(int direction) { |
| 2190 | if (getChildCount() <= 0) { |
| 2191 | return false; |
| 2192 | } |
| 2193 | |
| 2194 | View selectedView = getSelectedView(); |
| 2195 | |
| 2196 | int nextSelectedPosition = lookForSelectablePositionOnScreen(direction); |
| 2197 | int amountToScroll = amountToScroll(direction, nextSelectedPosition); |
| 2198 | |
| 2199 | // if we are moving focus, we may OVERRIDE the default behavior |
| 2200 | final ArrowScrollFocusResult focusResult = mItemsCanFocus ? arrowScrollFocused(direction) : null; |
| 2201 | if (focusResult != null) { |
| 2202 | nextSelectedPosition = focusResult.getSelectedPosition(); |
| 2203 | amountToScroll = focusResult.getAmountToScroll(); |
| 2204 | } |
| 2205 | |
| 2206 | boolean needToRedraw = focusResult != null; |
| 2207 | if (nextSelectedPosition != INVALID_POSITION) { |
| 2208 | handleNewSelectionChange(selectedView, direction, nextSelectedPosition, focusResult != null); |
| 2209 | setSelectedPositionInt(nextSelectedPosition); |
| 2210 | setNextSelectedPositionInt(nextSelectedPosition); |
| 2211 | selectedView = getSelectedView(); |
| 2212 | if (mItemsCanFocus && focusResult == null) { |
| 2213 | // there was no new view found to take focus, make sure we |
| 2214 | // don't leave focus with the old selection |
| 2215 | final View focused = getFocusedChild(); |
| 2216 | if (focused != null) { |
| 2217 | focused.clearFocus(); |
| 2218 | } |
| 2219 | } |
| 2220 | needToRedraw = true; |
| 2221 | checkSelectionChanged(); |
| 2222 | } |
| 2223 | |
| 2224 | if (amountToScroll > 0) { |
| 2225 | scrollListItemsBy((direction == View.FOCUS_UP) ? amountToScroll : -amountToScroll); |
| 2226 | needToRedraw = true; |
| 2227 | } |
| 2228 | |
| 2229 | // if we didn't find a new focusable, make sure any existing focused |
| 2230 | // item that was panned off screen gives up focus. |
| 2231 | if (mItemsCanFocus && (focusResult == null) |
| 2232 | && selectedView != null && selectedView.hasFocus()) { |
| 2233 | final View focused = selectedView.findFocus(); |
| 2234 | if (distanceToView(focused) > 0) { |
| 2235 | focused.clearFocus(); |
| 2236 | } |
| 2237 | } |
| 2238 | |
| 2239 | // if the current selection is panned off, we need to remove the selection |
| 2240 | if (nextSelectedPosition == INVALID_POSITION && selectedView != null |
| 2241 | && !isViewAncestorOf(selectedView, this)) { |
| 2242 | selectedView = null; |
| 2243 | hideSelector(); |
| 2244 | |
| 2245 | // but we don't want to set the ressurect position (that would make subsequent |
| 2246 | // unhandled key events bring back the item we just scrolled off!) |
| 2247 | mResurrectToPosition = INVALID_POSITION; |
| 2248 | } |
| 2249 | |
| 2250 | if (needToRedraw) { |
| 2251 | if (selectedView != null) { |
| 2252 | positionSelector(selectedView); |
| 2253 | mSelectedTop = selectedView.getTop(); |
| 2254 | } |
| 2255 | invalidate(); |
| 2256 | invokeOnItemScrollListener(); |
| 2257 | return true; |
| 2258 | } |
| 2259 | |
| 2260 | return false; |
| 2261 | } |
| 2262 | |
| 2263 | /** |
| 2264 | * When selection changes, it is possible that the previously selected or the |
| 2265 | * next selected item will change its size. If so, we need to offset some folks, |
| 2266 | * and re-layout the items as appropriate. |
| 2267 | * |
| 2268 | * @param selectedView The currently selected view (before changing selection). |
| 2269 | * should be <code>null</code> if there was no previous selection. |
| 2270 | * @param direction Either {@link android.view.View#FOCUS_UP} or |
| 2271 | * {@link android.view.View#FOCUS_DOWN}. |
| 2272 | * @param newSelectedPosition The position of the next selection. |
| 2273 | * @param newFocusAssigned whether new focus was assigned. This matters because |
| 2274 | * when something has focus, we don't want to show selection (ugh). |
| 2275 | */ |
| 2276 | private void handleNewSelectionChange(View selectedView, int direction, int newSelectedPosition, |
| 2277 | boolean newFocusAssigned) { |
| 2278 | if (newSelectedPosition == INVALID_POSITION) { |
| 2279 | throw new IllegalArgumentException("newSelectedPosition needs to be valid"); |
| 2280 | } |
| 2281 | |
| 2282 | // whether or not we are moving down or up, we want to preserve the |
| 2283 | // top of whatever view is on top: |
| 2284 | // - moving down: the view that had selection |
| 2285 | // - moving up: the view that is getting selection |
| 2286 | View topView; |
| 2287 | View bottomView; |
| 2288 | int topViewIndex, bottomViewIndex; |
| 2289 | boolean topSelected = false; |
| 2290 | final int selectedIndex = mSelectedPosition - mFirstPosition; |
| 2291 | final int nextSelectedIndex = newSelectedPosition - mFirstPosition; |
| 2292 | if (direction == View.FOCUS_UP) { |
| 2293 | topViewIndex = nextSelectedIndex; |
| 2294 | bottomViewIndex = selectedIndex; |
| 2295 | topView = getChildAt(topViewIndex); |
| 2296 | bottomView = selectedView; |
| 2297 | topSelected = true; |
| 2298 | } else { |
| 2299 | topViewIndex = selectedIndex; |
| 2300 | bottomViewIndex = nextSelectedIndex; |
| 2301 | topView = selectedView; |
| 2302 | bottomView = getChildAt(bottomViewIndex); |
| 2303 | } |
| 2304 | |
| 2305 | final int numChildren = getChildCount(); |
| 2306 | |
| 2307 | // start with top view: is it changing size? |
| 2308 | if (topView != null) { |
| 2309 | topView.setSelected(!newFocusAssigned && topSelected); |
| 2310 | measureAndAdjustDown(topView, topViewIndex, numChildren); |
| 2311 | } |
| 2312 | |
| 2313 | // is the bottom view changing size? |
| 2314 | if (bottomView != null) { |
| 2315 | bottomView.setSelected(!newFocusAssigned && !topSelected); |
| 2316 | measureAndAdjustDown(bottomView, bottomViewIndex, numChildren); |
| 2317 | } |
| 2318 | } |
| 2319 | |
| 2320 | /** |
| 2321 | * Re-measure a child, and if its height changes, lay it out preserving its |
| 2322 | * top, and adjust the children below it appropriately. |
| 2323 | * @param child The child |
| 2324 | * @param childIndex The view group index of the child. |
| 2325 | * @param numChildren The number of children in the view group. |
| 2326 | */ |
| 2327 | private void measureAndAdjustDown(View child, int childIndex, int numChildren) { |
| 2328 | int oldHeight = child.getHeight(); |
| 2329 | measureItem(child); |
| 2330 | if (child.getMeasuredHeight() != oldHeight) { |
| 2331 | // lay out the view, preserving its top |
| 2332 | relayoutMeasuredItem(child); |
| 2333 | |
| 2334 | // adjust views below appropriately |
| 2335 | final int heightDelta = child.getMeasuredHeight() - oldHeight; |
| 2336 | for (int i = childIndex + 1; i < numChildren; i++) { |
| 2337 | getChildAt(i).offsetTopAndBottom(heightDelta); |
| 2338 | } |
| 2339 | } |
| 2340 | } |
| 2341 | |
| 2342 | /** |
| 2343 | * Measure a particular list child. |
| 2344 | * TODO: unify with setUpChild. |
| 2345 | * @param child The child. |
| 2346 | */ |
| 2347 | private void measureItem(View child) { |
| 2348 | ViewGroup.LayoutParams p = child.getLayoutParams(); |
| 2349 | if (p == null) { |
| 2350 | p = new ViewGroup.LayoutParams( |
| 2351 | ViewGroup.LayoutParams.FILL_PARENT, |
| 2352 | ViewGroup.LayoutParams.WRAP_CONTENT); |
| 2353 | } |
| 2354 | |
| 2355 | int childWidthSpec = ViewGroup.getChildMeasureSpec(mWidthMeasureSpec, |
| 2356 | mListPadding.left + mListPadding.right, p.width); |
| 2357 | int lpHeight = p.height; |
| 2358 | int childHeightSpec; |
| 2359 | if (lpHeight > 0) { |
| 2360 | childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight, MeasureSpec.EXACTLY); |
| 2361 | } else { |
| 2362 | childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); |
| 2363 | } |
| 2364 | child.measure(childWidthSpec, childHeightSpec); |
| 2365 | } |
| 2366 | |
| 2367 | /** |
| 2368 | * Layout a child that has been measured, preserving its top position. |
| 2369 | * TODO: unify with setUpChild. |
| 2370 | * @param child The child. |
| 2371 | */ |
| 2372 | private void relayoutMeasuredItem(View child) { |
| 2373 | final int w = child.getMeasuredWidth(); |
| 2374 | final int h = child.getMeasuredHeight(); |
| 2375 | final int childLeft = mListPadding.left; |
| 2376 | final int childRight = childLeft + w; |
| 2377 | final int childTop = child.getTop(); |
| 2378 | final int childBottom = childTop + h; |
| 2379 | child.layout(childLeft, childTop, childRight, childBottom); |
| 2380 | } |
| 2381 | |
| 2382 | /** |
| 2383 | * @return The amount to preview next items when arrow srolling. |
| 2384 | */ |
| 2385 | private int getArrowScrollPreviewLength() { |
| 2386 | return Math.max(MIN_SCROLL_PREVIEW_PIXELS, getVerticalFadingEdgeLength()); |
| 2387 | } |
| 2388 | |
| 2389 | /** |
| 2390 | * Determine how much we need to scroll in order to get the next selected view |
| 2391 | * visible, with a fading edge showing below as applicable. The amount is |
| 2392 | * capped at {@link #getMaxScrollAmount()} . |
| 2393 | * |
| 2394 | * @param direction either {@link android.view.View#FOCUS_UP} or |
| 2395 | * {@link android.view.View#FOCUS_DOWN}. |
| 2396 | * @param nextSelectedPosition The position of the next selection, or |
| 2397 | * {@link #INVALID_POSITION} if there is no next selectable position |
| 2398 | * @return The amount to scroll. Note: this is always positive! Direction |
| 2399 | * needs to be taken into account when actually scrolling. |
| 2400 | */ |
| 2401 | private int amountToScroll(int direction, int nextSelectedPosition) { |
| 2402 | final int listBottom = getHeight() - mListPadding.bottom; |
| 2403 | final int listTop = mListPadding.top; |
| 2404 | |
| 2405 | final int numChildren = getChildCount(); |
| 2406 | |
| 2407 | if (direction == View.FOCUS_DOWN) { |
| 2408 | int indexToMakeVisible = numChildren - 1; |
| 2409 | if (nextSelectedPosition != INVALID_POSITION) { |
| 2410 | indexToMakeVisible = nextSelectedPosition - mFirstPosition; |
| 2411 | } |
| 2412 | |
| 2413 | final int positionToMakeVisible = mFirstPosition + indexToMakeVisible; |
| 2414 | final View viewToMakeVisible = getChildAt(indexToMakeVisible); |
| 2415 | |
| 2416 | int goalBottom = listBottom; |
| 2417 | if (positionToMakeVisible < mItemCount - 1) { |
| 2418 | goalBottom -= getArrowScrollPreviewLength(); |
| 2419 | } |
| 2420 | |
| 2421 | if (viewToMakeVisible.getBottom() <= goalBottom) { |
| 2422 | // item is fully visible. |
| 2423 | return 0; |
| 2424 | } |
| 2425 | |
| 2426 | if (nextSelectedPosition != INVALID_POSITION |
| 2427 | && (goalBottom - viewToMakeVisible.getTop()) >= getMaxScrollAmount()) { |
| 2428 | // item already has enough of it visible, changing selection is good enough |
| 2429 | return 0; |
| 2430 | } |
| 2431 | |
| 2432 | int amountToScroll = (viewToMakeVisible.getBottom() - goalBottom); |
| 2433 | |
| 2434 | if ((mFirstPosition + numChildren) == mItemCount) { |
| 2435 | // last is last in list -> make sure we don't scroll past it |
| 2436 | final int max = getChildAt(numChildren - 1).getBottom() - listBottom; |
| 2437 | amountToScroll = Math.min(amountToScroll, max); |
| 2438 | } |
| 2439 | |
| 2440 | return Math.min(amountToScroll, getMaxScrollAmount()); |
| 2441 | } else { |
| 2442 | int indexToMakeVisible = 0; |
| 2443 | if (nextSelectedPosition != INVALID_POSITION) { |
| 2444 | indexToMakeVisible = nextSelectedPosition - mFirstPosition; |
| 2445 | } |
| 2446 | final int positionToMakeVisible = mFirstPosition + indexToMakeVisible; |
| 2447 | final View viewToMakeVisible = getChildAt(indexToMakeVisible); |
| 2448 | int goalTop = listTop; |
| 2449 | if (positionToMakeVisible > 0) { |
| 2450 | goalTop += getArrowScrollPreviewLength(); |
| 2451 | } |
| 2452 | if (viewToMakeVisible.getTop() >= goalTop) { |
| 2453 | // item is fully visible. |
| 2454 | return 0; |
| 2455 | } |
| 2456 | |
| 2457 | if (nextSelectedPosition != INVALID_POSITION && |
| 2458 | (viewToMakeVisible.getBottom() - goalTop) >= getMaxScrollAmount()) { |
| 2459 | // item already has enough of it visible, changing selection is good enough |
| 2460 | return 0; |
| 2461 | } |
| 2462 | |
| 2463 | int amountToScroll = (goalTop - viewToMakeVisible.getTop()); |
| 2464 | if (mFirstPosition == 0) { |
| 2465 | // first is first in list -> make sure we don't scroll past it |
| 2466 | final int max = listTop - getChildAt(0).getTop(); |
| 2467 | amountToScroll = Math.min(amountToScroll, max); |
| 2468 | } |
| 2469 | return Math.min(amountToScroll, getMaxScrollAmount()); |
| 2470 | } |
| 2471 | } |
| 2472 | |
| 2473 | /** |
| 2474 | * Holds results of focus aware arrow scrolling. |
| 2475 | */ |
| 2476 | static private class ArrowScrollFocusResult { |
| 2477 | private int mSelectedPosition; |
| 2478 | private int mAmountToScroll; |
| 2479 | |
| 2480 | /** |
| 2481 | * How {@link android.widget.ListView#arrowScrollFocused} returns its values. |
| 2482 | */ |
| 2483 | void populate(int selectedPosition, int amountToScroll) { |
| 2484 | mSelectedPosition = selectedPosition; |
| 2485 | mAmountToScroll = amountToScroll; |
| 2486 | } |
| 2487 | |
| 2488 | public int getSelectedPosition() { |
| 2489 | return mSelectedPosition; |
| 2490 | } |
| 2491 | |
| 2492 | public int getAmountToScroll() { |
| 2493 | return mAmountToScroll; |
| 2494 | } |
| 2495 | } |
| 2496 | |
| 2497 | /** |
| 2498 | * @param direction either {@link android.view.View#FOCUS_UP} or |
| 2499 | * {@link android.view.View#FOCUS_DOWN}. |
| 2500 | * @return The position of the next selectable position of the views that |
| 2501 | * are currently visible, taking into account the fact that there might |
| 2502 | * be no selection. Returns {@link #INVALID_POSITION} if there is no |
| 2503 | * selectable view on screen in the given direction. |
| 2504 | */ |
| 2505 | private int lookForSelectablePositionOnScreen(int direction) { |
| 2506 | final int firstPosition = mFirstPosition; |
| 2507 | if (direction == View.FOCUS_DOWN) { |
| 2508 | int startPos = (mSelectedPosition != INVALID_POSITION) ? |
| 2509 | mSelectedPosition + 1 : |
| 2510 | firstPosition; |
| 2511 | if (startPos >= mAdapter.getCount()) { |
| 2512 | return INVALID_POSITION; |
| 2513 | } |
| 2514 | if (startPos < firstPosition) { |
| 2515 | startPos = firstPosition; |
| 2516 | } |
| 2517 | |
| 2518 | final int lastVisiblePos = getLastVisiblePosition(); |
| 2519 | final ListAdapter adapter = getAdapter(); |
| 2520 | for (int pos = startPos; pos <= lastVisiblePos; pos++) { |
| 2521 | if (adapter.isEnabled(pos) |
| 2522 | && getChildAt(pos - firstPosition).getVisibility() == View.VISIBLE) { |
| 2523 | return pos; |
| 2524 | } |
| 2525 | } |
| 2526 | } else { |
| 2527 | int last = firstPosition + getChildCount() - 1; |
| 2528 | int startPos = (mSelectedPosition != INVALID_POSITION) ? |
| 2529 | mSelectedPosition - 1 : |
| 2530 | firstPosition + getChildCount() - 1; |
| 2531 | if (startPos < 0) { |
| 2532 | return INVALID_POSITION; |
| 2533 | } |
| 2534 | if (startPos > last) { |
| 2535 | startPos = last; |
| 2536 | } |
| 2537 | |
| 2538 | final ListAdapter adapter = getAdapter(); |
| 2539 | for (int pos = startPos; pos >= firstPosition; pos--) { |
| 2540 | if (adapter.isEnabled(pos) |
| 2541 | && getChildAt(pos - firstPosition).getVisibility() == View.VISIBLE) { |
| 2542 | return pos; |
| 2543 | } |
| 2544 | } |
| 2545 | } |
| 2546 | return INVALID_POSITION; |
| 2547 | } |
| 2548 | |
| 2549 | /** |
| 2550 | * Do an arrow scroll based on focus searching. If a new view is |
| 2551 | * given focus, return the selection delta and amount to scroll via |
| 2552 | * an {@link ArrowScrollFocusResult}, otherwise, return null. |
| 2553 | * |
| 2554 | * @param direction either {@link android.view.View#FOCUS_UP} or |
| 2555 | * {@link android.view.View#FOCUS_DOWN}. |
| 2556 | * @return The result if focus has changed, or <code>null</code>. |
| 2557 | */ |
| 2558 | private ArrowScrollFocusResult arrowScrollFocused(final int direction) { |
| 2559 | final View selectedView = getSelectedView(); |
| 2560 | View newFocus; |
| 2561 | if (selectedView != null && selectedView.hasFocus()) { |
| 2562 | View oldFocus = selectedView.findFocus(); |
| 2563 | newFocus = FocusFinder.getInstance().findNextFocus(this, oldFocus, direction); |
| 2564 | } else { |
| 2565 | if (direction == View.FOCUS_DOWN) { |
| 2566 | final boolean topFadingEdgeShowing = (mFirstPosition > 0); |
| 2567 | final int listTop = mListPadding.top + |
| 2568 | (topFadingEdgeShowing ? getArrowScrollPreviewLength() : 0); |
| 2569 | final int ySearchPoint = |
| 2570 | (selectedView != null && selectedView.getTop() > listTop) ? |
| 2571 | selectedView.getTop() : |
| 2572 | listTop; |
| 2573 | mTempRect.set(0, ySearchPoint, 0, ySearchPoint); |
| 2574 | } else { |
| 2575 | final boolean bottomFadingEdgeShowing = |
| 2576 | (mFirstPosition + getChildCount() - 1) < mItemCount; |
| 2577 | final int listBottom = getHeight() - mListPadding.bottom - |
| 2578 | (bottomFadingEdgeShowing ? getArrowScrollPreviewLength() : 0); |
| 2579 | final int ySearchPoint = |
| 2580 | (selectedView != null && selectedView.getBottom() < listBottom) ? |
| 2581 | selectedView.getBottom() : |
| 2582 | listBottom; |
| 2583 | mTempRect.set(0, ySearchPoint, 0, ySearchPoint); |
| 2584 | } |
| 2585 | newFocus = FocusFinder.getInstance().findNextFocusFromRect(this, mTempRect, direction); |
| 2586 | } |
| 2587 | |
| 2588 | if (newFocus != null) { |
| 2589 | final int positionOfNewFocus = positionOfNewFocus(newFocus); |
| 2590 | |
| 2591 | // if the focus change is in a different new position, make sure |
| 2592 | // we aren't jumping over another selectable position |
| 2593 | if (mSelectedPosition != INVALID_POSITION && positionOfNewFocus != mSelectedPosition) { |
| 2594 | final int selectablePosition = lookForSelectablePositionOnScreen(direction); |
| 2595 | if (selectablePosition != INVALID_POSITION && |
| 2596 | ((direction == View.FOCUS_DOWN && selectablePosition < positionOfNewFocus) || |
| 2597 | (direction == View.FOCUS_UP && selectablePosition > positionOfNewFocus))) { |
| 2598 | return null; |
| 2599 | } |
| 2600 | } |
| 2601 | |
| 2602 | int focusScroll = amountToScrollToNewFocus(direction, newFocus, positionOfNewFocus); |
| 2603 | |
| 2604 | final int maxScrollAmount = getMaxScrollAmount(); |
| 2605 | if (focusScroll < maxScrollAmount) { |
| 2606 | // not moving too far, safe to give next view focus |
| 2607 | newFocus.requestFocus(direction); |
| 2608 | mArrowScrollFocusResult.populate(positionOfNewFocus, focusScroll); |
| 2609 | return mArrowScrollFocusResult; |
| 2610 | } else if (distanceToView(newFocus) < maxScrollAmount){ |
| 2611 | // Case to consider: |
| 2612 | // too far to get entire next focusable on screen, but by going |
| 2613 | // max scroll amount, we are getting it at least partially in view, |
| 2614 | // so give it focus and scroll the max ammount. |
| 2615 | newFocus.requestFocus(direction); |
| 2616 | mArrowScrollFocusResult.populate(positionOfNewFocus, maxScrollAmount); |
| 2617 | return mArrowScrollFocusResult; |
| 2618 | } |
| 2619 | } |
| 2620 | return null; |
| 2621 | } |
| 2622 | |
| 2623 | /** |
| 2624 | * @param newFocus The view that would have focus. |
| 2625 | * @return the position that contains newFocus |
| 2626 | */ |
| 2627 | private int positionOfNewFocus(View newFocus) { |
| 2628 | final int numChildren = getChildCount(); |
| 2629 | for (int i = 0; i < numChildren; i++) { |
| 2630 | final View child = getChildAt(i); |
| 2631 | if (isViewAncestorOf(newFocus, child)) { |
| 2632 | return mFirstPosition + i; |
| 2633 | } |
| 2634 | } |
| 2635 | throw new IllegalArgumentException("newFocus is not a child of any of the" |
| 2636 | + " children of the list!"); |
| 2637 | } |
| 2638 | |
| 2639 | /** |
| 2640 | * Return true if child is an ancestor of parent, (or equal to the parent). |
| 2641 | */ |
| 2642 | private boolean isViewAncestorOf(View child, View parent) { |
| 2643 | if (child == parent) { |
| 2644 | return true; |
| 2645 | } |
| 2646 | |
| 2647 | final ViewParent theParent = child.getParent(); |
| 2648 | return (theParent instanceof ViewGroup) && isViewAncestorOf((View) theParent, parent); |
| 2649 | } |
| 2650 | |
| 2651 | /** |
| 2652 | * Determine how much we need to scroll in order to get newFocus in view. |
| 2653 | * @param direction either {@link android.view.View#FOCUS_UP} or |
| 2654 | * {@link android.view.View#FOCUS_DOWN}. |
| 2655 | * @param newFocus The view that would take focus. |
| 2656 | * @param positionOfNewFocus The position of the list item containing newFocus |
| 2657 | * @return The amount to scroll. Note: this is always positive! Direction |
| 2658 | * needs to be taken into account when actually scrolling. |
| 2659 | */ |
| 2660 | private int amountToScrollToNewFocus(int direction, View newFocus, int positionOfNewFocus) { |
| 2661 | int amountToScroll = 0; |
| 2662 | newFocus.getDrawingRect(mTempRect); |
| 2663 | offsetDescendantRectToMyCoords(newFocus, mTempRect); |
| 2664 | if (direction == View.FOCUS_UP) { |
| 2665 | if (mTempRect.top < mListPadding.top) { |
| 2666 | amountToScroll = mListPadding.top - mTempRect.top; |
| 2667 | if (positionOfNewFocus > 0) { |
| 2668 | amountToScroll += getArrowScrollPreviewLength(); |
| 2669 | } |
| 2670 | } |
| 2671 | } else { |
| 2672 | final int listBottom = getHeight() - mListPadding.bottom; |
| 2673 | if (mTempRect.bottom > listBottom) { |
| 2674 | amountToScroll = mTempRect.bottom - listBottom; |
| 2675 | if (positionOfNewFocus < mItemCount - 1) { |
| 2676 | amountToScroll += getArrowScrollPreviewLength(); |
| 2677 | } |
| 2678 | } |
| 2679 | } |
| 2680 | return amountToScroll; |
| 2681 | } |
| 2682 | |
| 2683 | /** |
| 2684 | * Determine the distance to the nearest edge of a view in a particular |
| 2685 | * direciton. |
| 2686 | * @param descendant A descendant of this list. |
| 2687 | * @return The distance, or 0 if the nearest edge is already on screen. |
| 2688 | */ |
| 2689 | private int distanceToView(View descendant) { |
| 2690 | int distance = 0; |
| 2691 | descendant.getDrawingRect(mTempRect); |
| 2692 | offsetDescendantRectToMyCoords(descendant, mTempRect); |
| 2693 | final int listBottom = mBottom - mTop - mListPadding.bottom; |
| 2694 | if (mTempRect.bottom < mListPadding.top) { |
| 2695 | distance = mListPadding.top - mTempRect.bottom; |
| 2696 | } else if (mTempRect.top > listBottom) { |
| 2697 | distance = mTempRect.top - listBottom; |
| 2698 | } |
| 2699 | return distance; |
| 2700 | } |
| 2701 | |
| 2702 | |
| 2703 | /** |
| 2704 | * Scroll the children by amount, adding a view at the end and removing |
| 2705 | * views that fall off as necessary. |
| 2706 | * |
| 2707 | * @param amount The amount (positive or negative) to scroll. |
| 2708 | */ |
| 2709 | private void scrollListItemsBy(int amount) { |
| 2710 | offsetChildrenTopAndBottom(amount); |
| 2711 | |
| 2712 | final int listBottom = getHeight() - mListPadding.bottom; |
| 2713 | final int listTop = mListPadding.top; |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 2714 | final AbsListView.RecycleBin recycleBin = mRecycler; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2715 | |
| 2716 | if (amount < 0) { |
| 2717 | // shifted items up |
| 2718 | |
| 2719 | // may need to pan views into the bottom space |
| 2720 | int numChildren = getChildCount(); |
| 2721 | View last = getChildAt(numChildren - 1); |
| 2722 | while (last.getBottom() < listBottom) { |
| 2723 | final int lastVisiblePosition = mFirstPosition + numChildren - 1; |
| 2724 | if (lastVisiblePosition < mItemCount - 1) { |
| 2725 | last = addViewBelow(last, lastVisiblePosition); |
| 2726 | numChildren++; |
| 2727 | } else { |
| 2728 | break; |
| 2729 | } |
| 2730 | } |
| 2731 | |
| 2732 | // may have brought in the last child of the list that is skinnier |
| 2733 | // than the fading edge, thereby leaving space at the end. need |
| 2734 | // to shift back |
| 2735 | if (last.getBottom() < listBottom) { |
| 2736 | offsetChildrenTopAndBottom(listBottom - last.getBottom()); |
| 2737 | } |
| 2738 | |
| 2739 | // top views may be panned off screen |
| 2740 | View first = getChildAt(0); |
| 2741 | while (first.getBottom() < listTop) { |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 2742 | AbsListView.LayoutParams layoutParams = (LayoutParams) first.getLayoutParams(); |
| 2743 | if (recycleBin.shouldRecycleViewType(layoutParams.viewType)) { |
| 2744 | removeViewInLayout(first); |
| 2745 | recycleBin.addScrapView(first); |
| 2746 | } else { |
| 2747 | detachViewFromParent(first); |
| 2748 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2749 | first = getChildAt(0); |
| 2750 | mFirstPosition++; |
| 2751 | } |
| 2752 | } else { |
| 2753 | // shifted items down |
| 2754 | View first = getChildAt(0); |
| 2755 | |
| 2756 | // may need to pan views into top |
| 2757 | while ((first.getTop() > listTop) && (mFirstPosition > 0)) { |
| 2758 | first = addViewAbove(first, mFirstPosition); |
| 2759 | mFirstPosition--; |
| 2760 | } |
| 2761 | |
| 2762 | // may have brought the very first child of the list in too far and |
| 2763 | // need to shift it back |
| 2764 | if (first.getTop() > listTop) { |
| 2765 | offsetChildrenTopAndBottom(listTop - first.getTop()); |
| 2766 | } |
| 2767 | |
| 2768 | int lastIndex = getChildCount() - 1; |
| 2769 | View last = getChildAt(lastIndex); |
| 2770 | |
| 2771 | // bottom view may be panned off screen |
| 2772 | while (last.getTop() > listBottom) { |
The Android Open Source Project | c39a6e0 | 2009-03-11 12:11:56 -0700 | [diff] [blame] | 2773 | AbsListView.LayoutParams layoutParams = (LayoutParams) last.getLayoutParams(); |
| 2774 | if (recycleBin.shouldRecycleViewType(layoutParams.viewType)) { |
| 2775 | removeViewInLayout(last); |
| 2776 | recycleBin.addScrapView(last); |
| 2777 | } else { |
| 2778 | detachViewFromParent(last); |
| 2779 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2780 | last = getChildAt(--lastIndex); |
| 2781 | } |
| 2782 | } |
| 2783 | } |
| 2784 | |
| 2785 | private View addViewAbove(View theView, int position) { |
| 2786 | int abovePosition = position - 1; |
| 2787 | View view = obtainView(abovePosition); |
| 2788 | int edgeOfNewChild = theView.getTop() - mDividerHeight; |
| 2789 | setupChild(view, abovePosition, edgeOfNewChild, false, mListPadding.left, false, false); |
| 2790 | return view; |
| 2791 | } |
| 2792 | |
| 2793 | private View addViewBelow(View theView, int position) { |
| 2794 | int belowPosition = position + 1; |
| 2795 | View view = obtainView(belowPosition); |
| 2796 | int edgeOfNewChild = theView.getBottom() + mDividerHeight; |
| 2797 | setupChild(view, belowPosition, edgeOfNewChild, true, mListPadding.left, false, false); |
| 2798 | return view; |
| 2799 | } |
| 2800 | |
| 2801 | /** |
| 2802 | * Indicates that the views created by the ListAdapter can contain focusable |
| 2803 | * items. |
| 2804 | * |
| 2805 | * @param itemsCanFocus true if items can get focus, false otherwise |
| 2806 | */ |
| 2807 | public void setItemsCanFocus(boolean itemsCanFocus) { |
| 2808 | mItemsCanFocus = itemsCanFocus; |
| 2809 | if (!itemsCanFocus) { |
| 2810 | setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS); |
| 2811 | } |
| 2812 | } |
| 2813 | |
| 2814 | /** |
| 2815 | * @return Whether the views created by the ListAdapter can contain focusable |
| 2816 | * items. |
| 2817 | */ |
| 2818 | public boolean getItemsCanFocus() { |
| 2819 | return mItemsCanFocus; |
| 2820 | } |
| 2821 | |
Romain Guy | 2d6afea | 2009-05-11 15:19:21 -0700 | [diff] [blame] | 2822 | /** |
| 2823 | * @hide Pending API council approval. |
| 2824 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2825 | @Override |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 2826 | public boolean isOpaque() { |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 2827 | return (mCachingStarted && mIsCacheColorOpaque && mDividerIsOpaque && |
| 2828 | hasOpaqueScrollbars()) || super.isOpaque(); |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 2829 | } |
| 2830 | |
| 2831 | @Override |
| 2832 | public void setCacheColorHint(int color) { |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 2833 | final boolean opaque = (color >>> 24) == 0xFF; |
| 2834 | mIsCacheColorOpaque = opaque; |
| 2835 | if (opaque) { |
Romain Guy | a02903f | 2009-05-23 13:26:46 -0700 | [diff] [blame] | 2836 | if (mDividerPaint == null) { |
| 2837 | mDividerPaint = new Paint(); |
| 2838 | } |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 2839 | mDividerPaint.setColor(color); |
| 2840 | } |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 2841 | super.setCacheColorHint(color); |
| 2842 | } |
| 2843 | |
| 2844 | @Override |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2845 | protected void dispatchDraw(Canvas canvas) { |
| 2846 | // Draw the dividers |
| 2847 | final int dividerHeight = mDividerHeight; |
| 2848 | |
| 2849 | if (dividerHeight > 0 && mDivider != null) { |
| 2850 | // Only modify the top and bottom in the loop, we set the left and right here |
| 2851 | final Rect bounds = mTempRect; |
| 2852 | bounds.left = mPaddingLeft; |
| 2853 | bounds.right = mRight - mLeft - mPaddingRight; |
| 2854 | |
| 2855 | final int count = getChildCount(); |
| 2856 | final int headerCount = mHeaderViewInfos.size(); |
| 2857 | final int footerLimit = mItemCount - mFooterViewInfos.size() - 1; |
| 2858 | final boolean headerDividers = mHeaderDividersEnabled; |
| 2859 | final boolean footerDividers = mFooterDividersEnabled; |
| 2860 | final int first = mFirstPosition; |
Romain Guy | 2bed227 | 2009-03-24 18:23:21 -0700 | [diff] [blame] | 2861 | final boolean areAllItemsSelectable = mAreAllItemsSelectable; |
| 2862 | final ListAdapter adapter = mAdapter; |
Romain Guy | e32edc6 | 2009-05-29 10:33:36 -0700 | [diff] [blame] | 2863 | // If the list is opaque *and* the background is not, we want to |
| 2864 | // fill a rect where the dividers would be for non-selectable items |
| 2865 | // If the list is opaque and the background is also opaque, we don't |
| 2866 | // need to draw anything since the background will do it for us |
| 2867 | final boolean fillForMissingDividers = isOpaque() && !super.isOpaque(); |
| 2868 | |
| 2869 | if (fillForMissingDividers && mDividerPaint == null && mIsCacheColorOpaque) { |
Romain Guy | a02903f | 2009-05-23 13:26:46 -0700 | [diff] [blame] | 2870 | mDividerPaint = new Paint(); |
Romain Guy | e32edc6 | 2009-05-29 10:33:36 -0700 | [diff] [blame] | 2871 | mDividerPaint.setColor(getCacheColorHint()); |
Romain Guy | a02903f | 2009-05-23 13:26:46 -0700 | [diff] [blame] | 2872 | } |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 2873 | final Paint paint = mDividerPaint; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2874 | |
| 2875 | if (!mStackFromBottom) { |
| 2876 | int bottom; |
| 2877 | int listBottom = mBottom - mTop - mListPadding.bottom; |
| 2878 | |
| 2879 | for (int i = 0; i < count; i++) { |
| 2880 | if ((headerDividers || first + i >= headerCount) && |
| 2881 | (footerDividers || first + i < footerLimit)) { |
| 2882 | View child = getChildAt(i); |
| 2883 | bottom = child.getBottom(); |
Romain Guy | 2bed227 | 2009-03-24 18:23:21 -0700 | [diff] [blame] | 2884 | // Don't draw dividers next to items that are not enabled |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 2885 | if (bottom < listBottom) { |
| 2886 | if ((areAllItemsSelectable || |
| 2887 | (adapter.isEnabled(first + i) && (i == count - 1 || |
| 2888 | adapter.isEnabled(first + i + 1))))) { |
| 2889 | bounds.top = bottom; |
| 2890 | bounds.bottom = bottom + dividerHeight; |
| 2891 | drawDivider(canvas, bounds, i); |
Romain Guy | e32edc6 | 2009-05-29 10:33:36 -0700 | [diff] [blame] | 2892 | } else if (fillForMissingDividers) { |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 2893 | bounds.top = bottom; |
| 2894 | bounds.bottom = bottom + dividerHeight; |
| 2895 | canvas.drawRect(bounds, paint); |
| 2896 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2897 | } |
| 2898 | } |
| 2899 | } |
| 2900 | } else { |
| 2901 | int top; |
| 2902 | int listTop = mListPadding.top; |
| 2903 | |
| 2904 | for (int i = 0; i < count; i++) { |
| 2905 | if ((headerDividers || first + i >= headerCount) && |
| 2906 | (footerDividers || first + i < footerLimit)) { |
| 2907 | View child = getChildAt(i); |
| 2908 | top = child.getTop(); |
Romain Guy | 2bed227 | 2009-03-24 18:23:21 -0700 | [diff] [blame] | 2909 | // Don't draw dividers next to items that are not enabled |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 2910 | if (top > listTop) { |
| 2911 | if ((areAllItemsSelectable || |
| 2912 | (adapter.isEnabled(first + i) && (i == count - 1 || |
| 2913 | adapter.isEnabled(first + i + 1))))) { |
| 2914 | bounds.top = top - dividerHeight; |
| 2915 | bounds.bottom = top; |
| 2916 | // Give the method the child ABOVE the divider, so we |
| 2917 | // subtract one from our child |
| 2918 | // position. Give -1 when there is no child above the |
| 2919 | // divider. |
| 2920 | drawDivider(canvas, bounds, i - 1); |
Romain Guy | e32edc6 | 2009-05-29 10:33:36 -0700 | [diff] [blame] | 2921 | } else if (fillForMissingDividers) { |
Romain Guy | 8f1344f | 2009-05-15 16:03:59 -0700 | [diff] [blame] | 2922 | bounds.top = top - dividerHeight; |
| 2923 | bounds.bottom = top; |
| 2924 | canvas.drawRect(bounds, paint); |
| 2925 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2926 | } |
| 2927 | } |
| 2928 | } |
| 2929 | } |
| 2930 | } |
| 2931 | |
| 2932 | // Draw the indicators (these should be drawn above the dividers) and children |
| 2933 | super.dispatchDraw(canvas); |
| 2934 | } |
| 2935 | |
| 2936 | /** |
| 2937 | * Draws a divider for the given child in the given bounds. |
| 2938 | * |
| 2939 | * @param canvas The canvas to draw to. |
| 2940 | * @param bounds The bounds of the divider. |
| 2941 | * @param childIndex The index of child (of the View) above the divider. |
| 2942 | * This will be -1 if there is no child above the divider to be |
| 2943 | * drawn. |
| 2944 | */ |
| 2945 | void drawDivider(Canvas canvas, Rect bounds, int childIndex) { |
| 2946 | // This widget draws the same divider for all children |
| 2947 | final Drawable divider = mDivider; |
| 2948 | final boolean clipDivider = mClipDivider; |
| 2949 | |
| 2950 | if (!clipDivider) { |
| 2951 | divider.setBounds(bounds); |
| 2952 | } else { |
| 2953 | canvas.save(); |
| 2954 | canvas.clipRect(bounds); |
| 2955 | } |
| 2956 | |
| 2957 | divider.draw(canvas); |
| 2958 | |
| 2959 | if (clipDivider) { |
| 2960 | canvas.restore(); |
| 2961 | } |
| 2962 | } |
| 2963 | |
| 2964 | /** |
| 2965 | * Returns the drawable that will be drawn between each item in the list. |
| 2966 | * |
| 2967 | * @return the current drawable drawn between list elements |
| 2968 | */ |
| 2969 | public Drawable getDivider() { |
| 2970 | return mDivider; |
| 2971 | } |
| 2972 | |
| 2973 | /** |
| 2974 | * Sets the drawable that will be drawn between each item in the list. If the drawable does |
| 2975 | * not have an intrinsic height, you should also call {@link #setDividerHeight(int)} |
| 2976 | * |
| 2977 | * @param divider The drawable to use. |
| 2978 | */ |
| 2979 | public void setDivider(Drawable divider) { |
| 2980 | if (divider != null) { |
| 2981 | mDividerHeight = divider.getIntrinsicHeight(); |
| 2982 | mClipDivider = divider instanceof ColorDrawable; |
| 2983 | } else { |
| 2984 | mDividerHeight = 0; |
| 2985 | mClipDivider = false; |
| 2986 | } |
| 2987 | mDivider = divider; |
Romain Guy | 24443ea | 2009-05-11 11:56:30 -0700 | [diff] [blame] | 2988 | mDividerIsOpaque = divider == null || divider.getOpacity() == PixelFormat.OPAQUE; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2989 | requestLayoutIfNecessary(); |
| 2990 | } |
| 2991 | |
| 2992 | /** |
| 2993 | * @return Returns the height of the divider that will be drawn between each item in the list. |
| 2994 | */ |
| 2995 | public int getDividerHeight() { |
| 2996 | return mDividerHeight; |
| 2997 | } |
| 2998 | |
| 2999 | /** |
| 3000 | * Sets the height of the divider that will be drawn between each item in the list. Calling |
| 3001 | * this will override the intrinsic height as set by {@link #setDivider(Drawable)} |
| 3002 | * |
| 3003 | * @param height The new height of the divider in pixels. |
| 3004 | */ |
| 3005 | public void setDividerHeight(int height) { |
| 3006 | mDividerHeight = height; |
| 3007 | requestLayoutIfNecessary(); |
| 3008 | } |
| 3009 | |
| 3010 | /** |
| 3011 | * Enables or disables the drawing of the divider for header views. |
| 3012 | * |
| 3013 | * @param headerDividersEnabled True to draw the headers, false otherwise. |
| 3014 | * |
| 3015 | * @see #setFooterDividersEnabled(boolean) |
| 3016 | * @see #addHeaderView(android.view.View) |
| 3017 | */ |
| 3018 | public void setHeaderDividersEnabled(boolean headerDividersEnabled) { |
| 3019 | mHeaderDividersEnabled = headerDividersEnabled; |
| 3020 | invalidate(); |
| 3021 | } |
| 3022 | |
| 3023 | /** |
| 3024 | * Enables or disables the drawing of the divider for footer views. |
| 3025 | * |
| 3026 | * @param footerDividersEnabled True to draw the footers, false otherwise. |
| 3027 | * |
| 3028 | * @see #setHeaderDividersEnabled(boolean) |
| 3029 | * @see #addFooterView(android.view.View) |
| 3030 | */ |
| 3031 | public void setFooterDividersEnabled(boolean footerDividersEnabled) { |
| 3032 | mFooterDividersEnabled = footerDividersEnabled; |
| 3033 | invalidate(); |
| 3034 | } |
| 3035 | |
| 3036 | @Override |
| 3037 | protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { |
| 3038 | super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); |
| 3039 | |
| 3040 | int closetChildIndex = -1; |
| 3041 | if (gainFocus && previouslyFocusedRect != null) { |
| 3042 | previouslyFocusedRect.offset(mScrollX, mScrollY); |
| 3043 | |
| 3044 | // figure out which item should be selected based on previously |
| 3045 | // focused rect |
| 3046 | Rect otherRect = mTempRect; |
| 3047 | int minDistance = Integer.MAX_VALUE; |
| 3048 | final int childCount = getChildCount(); |
| 3049 | final int firstPosition = mFirstPosition; |
| 3050 | final ListAdapter adapter = mAdapter; |
| 3051 | |
| 3052 | for (int i = 0; i < childCount; i++) { |
| 3053 | // only consider selectable views |
| 3054 | if (!adapter.isEnabled(firstPosition + i)) { |
| 3055 | continue; |
| 3056 | } |
| 3057 | |
| 3058 | View other = getChildAt(i); |
| 3059 | other.getDrawingRect(otherRect); |
| 3060 | offsetDescendantRectToMyCoords(other, otherRect); |
| 3061 | int distance = getDistance(previouslyFocusedRect, otherRect, direction); |
| 3062 | |
| 3063 | if (distance < minDistance) { |
| 3064 | minDistance = distance; |
| 3065 | closetChildIndex = i; |
| 3066 | } |
| 3067 | } |
| 3068 | } |
| 3069 | |
| 3070 | if (closetChildIndex >= 0) { |
| 3071 | setSelection(closetChildIndex + mFirstPosition); |
| 3072 | } else { |
| 3073 | requestLayout(); |
| 3074 | } |
| 3075 | } |
| 3076 | |
| 3077 | |
| 3078 | /* |
| 3079 | * (non-Javadoc) |
| 3080 | * |
| 3081 | * Children specified in XML are assumed to be header views. After we have |
| 3082 | * parsed them move them out of the children list and into mHeaderViews. |
| 3083 | */ |
| 3084 | @Override |
| 3085 | protected void onFinishInflate() { |
| 3086 | super.onFinishInflate(); |
| 3087 | |
| 3088 | int count = getChildCount(); |
| 3089 | if (count > 0) { |
| 3090 | for (int i = 0; i < count; ++i) { |
| 3091 | addHeaderView(getChildAt(i)); |
| 3092 | } |
| 3093 | removeAllViews(); |
| 3094 | } |
| 3095 | } |
| 3096 | |
| 3097 | /* (non-Javadoc) |
| 3098 | * @see android.view.View#findViewById(int) |
| 3099 | * First look in our children, then in any header and footer views that may be scrolled off. |
| 3100 | */ |
| 3101 | @Override |
| 3102 | protected View findViewTraversal(int id) { |
| 3103 | View v; |
| 3104 | v = super.findViewTraversal(id); |
| 3105 | if (v == null) { |
| 3106 | v = findViewInHeadersOrFooters(mHeaderViewInfos, id); |
| 3107 | if (v != null) { |
| 3108 | return v; |
| 3109 | } |
| 3110 | v = findViewInHeadersOrFooters(mFooterViewInfos, id); |
| 3111 | if (v != null) { |
| 3112 | return v; |
| 3113 | } |
| 3114 | } |
| 3115 | return v; |
| 3116 | } |
| 3117 | |
| 3118 | /* (non-Javadoc) |
| 3119 | * |
| 3120 | * Look in the passed in list of headers or footers for the view. |
| 3121 | */ |
| 3122 | View findViewInHeadersOrFooters(ArrayList<FixedViewInfo> where, int id) { |
| 3123 | if (where != null) { |
| 3124 | int len = where.size(); |
| 3125 | View v; |
| 3126 | |
| 3127 | for (int i = 0; i < len; i++) { |
| 3128 | v = where.get(i).view; |
| 3129 | |
| 3130 | if (!v.isRootNamespace()) { |
| 3131 | v = v.findViewById(id); |
| 3132 | |
| 3133 | if (v != null) { |
| 3134 | return v; |
| 3135 | } |
| 3136 | } |
| 3137 | } |
| 3138 | } |
| 3139 | return null; |
| 3140 | } |
| 3141 | |
| 3142 | /* (non-Javadoc) |
| 3143 | * @see android.view.View#findViewWithTag(String) |
| 3144 | * First look in our children, then in any header and footer views that may be scrolled off. |
| 3145 | */ |
| 3146 | @Override |
| 3147 | protected View findViewWithTagTraversal(Object tag) { |
| 3148 | View v; |
| 3149 | v = super.findViewWithTagTraversal(tag); |
| 3150 | if (v == null) { |
| 3151 | v = findViewTagInHeadersOrFooters(mHeaderViewInfos, tag); |
| 3152 | if (v != null) { |
| 3153 | return v; |
| 3154 | } |
| 3155 | |
| 3156 | v = findViewTagInHeadersOrFooters(mFooterViewInfos, tag); |
| 3157 | if (v != null) { |
| 3158 | return v; |
| 3159 | } |
| 3160 | } |
| 3161 | return v; |
| 3162 | } |
| 3163 | |
| 3164 | /* (non-Javadoc) |
| 3165 | * |
| 3166 | * Look in the passed in list of headers or footers for the view with the tag. |
| 3167 | */ |
| 3168 | View findViewTagInHeadersOrFooters(ArrayList<FixedViewInfo> where, Object tag) { |
| 3169 | if (where != null) { |
| 3170 | int len = where.size(); |
| 3171 | View v; |
| 3172 | |
| 3173 | for (int i = 0; i < len; i++) { |
| 3174 | v = where.get(i).view; |
| 3175 | |
| 3176 | if (!v.isRootNamespace()) { |
| 3177 | v = v.findViewWithTag(tag); |
| 3178 | |
| 3179 | if (v != null) { |
| 3180 | return v; |
| 3181 | } |
| 3182 | } |
| 3183 | } |
| 3184 | } |
| 3185 | return null; |
| 3186 | } |
| 3187 | |
| 3188 | @Override |
| 3189 | public boolean onTouchEvent(MotionEvent ev) { |
| 3190 | if (mItemsCanFocus && ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) { |
| 3191 | // Don't handle edge touches immediately -- they may actually belong to one of our |
| 3192 | // descendants. |
| 3193 | return false; |
| 3194 | } |
| 3195 | return super.onTouchEvent(ev); |
| 3196 | } |
| 3197 | |
| 3198 | /** |
| 3199 | * @see #setChoiceMode(int) |
| 3200 | * |
| 3201 | * @return The current choice mode |
| 3202 | */ |
| 3203 | public int getChoiceMode() { |
| 3204 | return mChoiceMode; |
| 3205 | } |
| 3206 | |
| 3207 | /** |
| 3208 | * Defines the choice behavior for the List. By default, Lists do not have any choice behavior |
| 3209 | * ({@link #CHOICE_MODE_NONE}). By setting the choiceMode to {@link #CHOICE_MODE_SINGLE}, the |
| 3210 | * List allows up to one item to be in a chosen state. By setting the choiceMode to |
| 3211 | * {@link #CHOICE_MODE_MULTIPLE}, the list allows any number of items to be chosen. |
| 3212 | * |
| 3213 | * @param choiceMode One of {@link #CHOICE_MODE_NONE}, {@link #CHOICE_MODE_SINGLE}, or |
| 3214 | * {@link #CHOICE_MODE_MULTIPLE} |
| 3215 | */ |
| 3216 | public void setChoiceMode(int choiceMode) { |
| 3217 | mChoiceMode = choiceMode; |
| 3218 | if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates == null) { |
| 3219 | mCheckStates = new SparseBooleanArray(); |
| 3220 | } |
| 3221 | } |
| 3222 | |
| 3223 | @Override |
| 3224 | public boolean performItemClick(View view, int position, long id) { |
| 3225 | boolean handled = false; |
| 3226 | |
| 3227 | if (mChoiceMode != CHOICE_MODE_NONE) { |
| 3228 | handled = true; |
| 3229 | |
| 3230 | if (mChoiceMode == CHOICE_MODE_MULTIPLE) { |
| 3231 | boolean oldValue = mCheckStates.get(position, false); |
| 3232 | mCheckStates.put(position, !oldValue); |
| 3233 | } else { |
| 3234 | boolean oldValue = mCheckStates.get(position, false); |
| 3235 | if (!oldValue) { |
| 3236 | mCheckStates.clear(); |
| 3237 | mCheckStates.put(position, true); |
| 3238 | } |
| 3239 | } |
| 3240 | |
| 3241 | mDataChanged = true; |
| 3242 | rememberSyncState(); |
| 3243 | requestLayout(); |
| 3244 | } |
| 3245 | |
| 3246 | handled |= super.performItemClick(view, position, id); |
| 3247 | |
| 3248 | return handled; |
| 3249 | } |
| 3250 | |
| 3251 | /** |
| 3252 | * Sets the checked state of the specified position. The is only valid if |
| 3253 | * the choice mode has been set to {@link #CHOICE_MODE_SINGLE} or |
| 3254 | * {@link #CHOICE_MODE_MULTIPLE}. |
| 3255 | * |
| 3256 | * @param position The item whose checked state is to be checked |
| 3257 | * @param value The new checked sate for the item |
| 3258 | */ |
| 3259 | public void setItemChecked(int position, boolean value) { |
| 3260 | if (mChoiceMode == CHOICE_MODE_NONE) { |
| 3261 | return; |
| 3262 | } |
| 3263 | |
| 3264 | if (mChoiceMode == CHOICE_MODE_MULTIPLE) { |
| 3265 | mCheckStates.put(position, value); |
| 3266 | } else { |
Romain Guy | 8842f0b | 2009-06-24 12:53:54 -0700 | [diff] [blame^] | 3267 | // Clear the old value: if something was selected and value == false |
| 3268 | // then it is unselected |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3269 | mCheckStates.clear(); |
Romain Guy | 8842f0b | 2009-06-24 12:53:54 -0700 | [diff] [blame^] | 3270 | // If value == true, select the appropriate position |
| 3271 | // this may end up selecting the value we just cleared but this way |
| 3272 | // we don't have to first to a get(position) |
| 3273 | if (value) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3274 | mCheckStates.put(position, true); |
| 3275 | } |
| 3276 | } |
| 3277 | |
| 3278 | // Do not generate a data change while we are in the layout phase |
| 3279 | if (!mInLayout && !mBlockLayoutRequests) { |
| 3280 | mDataChanged = true; |
| 3281 | rememberSyncState(); |
| 3282 | requestLayout(); |
| 3283 | } |
| 3284 | } |
| 3285 | |
| 3286 | /** |
| 3287 | * Returns the checked state of the specified position. The result is only |
| 3288 | * valid if the choice mode has not been set to {@link #CHOICE_MODE_SINGLE} |
| 3289 | * or {@link #CHOICE_MODE_MULTIPLE}. |
| 3290 | * |
| 3291 | * @param position The item whose checked state to return |
| 3292 | * @return The item's checked state |
| 3293 | * |
| 3294 | * @see #setChoiceMode(int) |
| 3295 | */ |
| 3296 | public boolean isItemChecked(int position) { |
| 3297 | if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) { |
| 3298 | return mCheckStates.get(position); |
| 3299 | } |
| 3300 | |
| 3301 | return false; |
| 3302 | } |
| 3303 | |
| 3304 | /** |
| 3305 | * Returns the currently checked item. The result is only valid if the choice |
| 3306 | * mode has not been set to {@link #CHOICE_MODE_SINGLE}. |
| 3307 | * |
| 3308 | * @return The position of the currently checked item or |
| 3309 | * {@link #INVALID_POSITION} if nothing is selected |
| 3310 | * |
| 3311 | * @see #setChoiceMode(int) |
| 3312 | */ |
| 3313 | public int getCheckedItemPosition() { |
| 3314 | if (mChoiceMode == CHOICE_MODE_SINGLE && mCheckStates != null && mCheckStates.size() == 1) { |
| 3315 | return mCheckStates.keyAt(0); |
| 3316 | } |
| 3317 | |
| 3318 | return INVALID_POSITION; |
| 3319 | } |
| 3320 | |
| 3321 | /** |
| 3322 | * Returns the set of checked items in the list. The result is only valid if |
| 3323 | * the choice mode has not been set to {@link #CHOICE_MODE_SINGLE}. |
| 3324 | * |
| 3325 | * @return A SparseBooleanArray which will return true for each call to |
| 3326 | * get(int position) where position is a position in the list. |
| 3327 | */ |
| 3328 | public SparseBooleanArray getCheckedItemPositions() { |
| 3329 | if (mChoiceMode != CHOICE_MODE_NONE) { |
| 3330 | return mCheckStates; |
| 3331 | } |
| 3332 | return null; |
| 3333 | } |
| 3334 | |
| 3335 | /** |
Romain Guy | ad28bed | 2009-04-01 11:46:43 -0700 | [diff] [blame] | 3336 | * Returns the set of checked items ids. The result is only valid if |
| 3337 | * the choice mode has not been set to {@link #CHOICE_MODE_SINGLE}. |
| 3338 | * |
| 3339 | * @return A new array which contains the id of each checked item in the list. |
| 3340 | */ |
| 3341 | public long[] getCheckItemIds() { |
| 3342 | if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null && mAdapter != null) { |
| 3343 | final SparseBooleanArray states = mCheckStates; |
| 3344 | final int count = states.size(); |
| 3345 | final long[] ids = new long[count]; |
| 3346 | final ListAdapter adapter = mAdapter; |
| 3347 | |
| 3348 | for (int i = 0; i < count; i++) { |
| 3349 | ids[i]= adapter.getItemId(states.keyAt(i)); |
| 3350 | } |
| 3351 | |
| 3352 | return ids; |
| 3353 | } |
| 3354 | |
| 3355 | return new long[0]; |
| 3356 | } |
| 3357 | |
| 3358 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 3359 | * Clear any choices previously set |
| 3360 | */ |
| 3361 | public void clearChoices() { |
| 3362 | if (mCheckStates != null) { |
| 3363 | mCheckStates.clear(); |
| 3364 | } |
| 3365 | } |
| 3366 | |
| 3367 | static class SavedState extends BaseSavedState { |
| 3368 | SparseBooleanArray checkState; |
| 3369 | |
| 3370 | /** |
| 3371 | * Constructor called from {@link ListView#onSaveInstanceState()} |
| 3372 | */ |
| 3373 | SavedState(Parcelable superState, SparseBooleanArray checkState) { |
| 3374 | super(superState); |
| 3375 | this.checkState = checkState; |
| 3376 | } |
| 3377 | |
| 3378 | /** |
| 3379 | * Constructor called from {@link #CREATOR} |
| 3380 | */ |
| 3381 | private SavedState(Parcel in) { |
| 3382 | super(in); |
| 3383 | checkState = in.readSparseBooleanArray(); |
| 3384 | } |
| 3385 | |
| 3386 | @Override |
| 3387 | public void writeToParcel(Parcel out, int flags) { |
| 3388 | super.writeToParcel(out, flags); |
| 3389 | out.writeSparseBooleanArray(checkState); |
| 3390 | } |
| 3391 | |
| 3392 | @Override |
| 3393 | public String toString() { |
| 3394 | return "ListView.SavedState{" |
| 3395 | + Integer.toHexString(System.identityHashCode(this)) |
| 3396 | + " checkState=" + checkState + "}"; |
| 3397 | } |
| 3398 | |
| 3399 | public static final Parcelable.Creator<SavedState> CREATOR |
| 3400 | = new Parcelable.Creator<SavedState>() { |
| 3401 | public SavedState createFromParcel(Parcel in) { |
| 3402 | return new SavedState(in); |
| 3403 | } |
| 3404 | |
| 3405 | public SavedState[] newArray(int size) { |
| 3406 | return new SavedState[size]; |
| 3407 | } |
| 3408 | }; |
| 3409 | } |
| 3410 | |
| 3411 | @Override |
| 3412 | public Parcelable onSaveInstanceState() { |
| 3413 | Parcelable superState = super.onSaveInstanceState(); |
| 3414 | return new SavedState(superState, mCheckStates); |
| 3415 | } |
| 3416 | |
| 3417 | @Override |
| 3418 | public void onRestoreInstanceState(Parcelable state) { |
| 3419 | SavedState ss = (SavedState) state; |
| 3420 | |
| 3421 | super.onRestoreInstanceState(ss.getSuperState()); |
| 3422 | |
| 3423 | if (ss.checkState != null) { |
| 3424 | mCheckStates = ss.checkState; |
| 3425 | } |
| 3426 | |
| 3427 | } |
| 3428 | } |