The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 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; |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 20 | import android.content.Intent; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 21 | import android.content.res.TypedArray; |
| 22 | import android.graphics.Rect; |
| 23 | import android.util.AttributeSet; |
| 24 | import android.view.Gravity; |
| 25 | import android.view.KeyEvent; |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 26 | import android.view.SoundEffectConstants; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 27 | import android.view.View; |
Andrew Sapperstein | 8d9db8e | 2010-05-13 17:01:03 -0700 | [diff] [blame] | 28 | import android.view.ViewDebug; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 29 | import android.view.ViewGroup; |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 30 | import android.view.accessibility.AccessibilityEvent; |
| 31 | import android.view.accessibility.AccessibilityNodeInfo; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 32 | import android.view.animation.GridLayoutAnimationController; |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 33 | import android.widget.RemoteViews.RemoteView; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 34 | |
| 35 | |
| 36 | /** |
| 37 | * A view that shows items in two-dimensional scrolling grid. The items in the |
| 38 | * grid come from the {@link ListAdapter} associated with this view. |
Scott Main | 41ec653 | 2010-08-19 16:57:07 -0700 | [diff] [blame] | 39 | * |
Scott Main | 4c359b7 | 2012-07-24 15:51:27 -0700 | [diff] [blame] | 40 | * <p>See the <a href="{@docRoot}guide/topics/ui/layout/gridview.html">Grid |
| 41 | * View</a> guide.</p> |
Romain Guy | 84c6b95 | 2011-02-22 11:15:42 -0800 | [diff] [blame] | 42 | * |
| 43 | * @attr ref android.R.styleable#GridView_horizontalSpacing |
| 44 | * @attr ref android.R.styleable#GridView_verticalSpacing |
| 45 | * @attr ref android.R.styleable#GridView_stretchMode |
| 46 | * @attr ref android.R.styleable#GridView_columnWidth |
| 47 | * @attr ref android.R.styleable#GridView_numColumns |
| 48 | * @attr ref android.R.styleable#GridView_gravity |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 49 | */ |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 50 | @RemoteView |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 51 | public class GridView extends AbsListView { |
Romain Guy | 84c6b95 | 2011-02-22 11:15:42 -0800 | [diff] [blame] | 52 | /** |
| 53 | * Disables stretching. |
| 54 | * |
| 55 | * @see #setStretchMode(int) |
| 56 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 57 | public static final int NO_STRETCH = 0; |
Romain Guy | 84c6b95 | 2011-02-22 11:15:42 -0800 | [diff] [blame] | 58 | /** |
| 59 | * Stretches the spacing between columns. |
| 60 | * |
| 61 | * @see #setStretchMode(int) |
| 62 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 63 | public static final int STRETCH_SPACING = 1; |
Romain Guy | 84c6b95 | 2011-02-22 11:15:42 -0800 | [diff] [blame] | 64 | /** |
| 65 | * Stretches columns. |
| 66 | * |
| 67 | * @see #setStretchMode(int) |
| 68 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 69 | public static final int STRETCH_COLUMN_WIDTH = 2; |
Romain Guy | 84c6b95 | 2011-02-22 11:15:42 -0800 | [diff] [blame] | 70 | /** |
| 71 | * Stretches the spacing between columns. The spacing is uniform. |
| 72 | * |
| 73 | * @see #setStretchMode(int) |
| 74 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 75 | public static final int STRETCH_SPACING_UNIFORM = 3; |
Romain Guy | 84c6b95 | 2011-02-22 11:15:42 -0800 | [diff] [blame] | 76 | |
| 77 | /** |
| 78 | * Creates as many columns as can fit on screen. |
| 79 | * |
| 80 | * @see #setNumColumns(int) |
| 81 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 82 | public static final int AUTO_FIT = -1; |
| 83 | |
| 84 | private int mNumColumns = AUTO_FIT; |
| 85 | |
| 86 | private int mHorizontalSpacing = 0; |
| 87 | private int mRequestedHorizontalSpacing; |
| 88 | private int mVerticalSpacing = 0; |
| 89 | private int mStretchMode = STRETCH_COLUMN_WIDTH; |
| 90 | private int mColumnWidth; |
| 91 | private int mRequestedColumnWidth; |
| 92 | private int mRequestedNumColumns; |
| 93 | |
| 94 | private View mReferenceView = null; |
| 95 | private View mReferenceViewInSelectedRow = null; |
| 96 | |
Fabrice Di Meglio | a598720 | 2012-06-08 15:22:20 -0700 | [diff] [blame] | 97 | private int mGravity = Gravity.START; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 98 | |
| 99 | private final Rect mTempRect = new Rect(); |
| 100 | |
| 101 | public GridView(Context context) { |
Adam Powell | 4877453 | 2012-03-12 13:41:37 -0700 | [diff] [blame] | 102 | this(context, null); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | public GridView(Context context, AttributeSet attrs) { |
| 106 | this(context, attrs, com.android.internal.R.attr.gridViewStyle); |
| 107 | } |
| 108 | |
| 109 | public GridView(Context context, AttributeSet attrs, int defStyle) { |
| 110 | super(context, attrs, defStyle); |
| 111 | |
| 112 | TypedArray a = context.obtainStyledAttributes(attrs, |
| 113 | com.android.internal.R.styleable.GridView, defStyle, 0); |
| 114 | |
| 115 | int hSpacing = a.getDimensionPixelOffset( |
| 116 | com.android.internal.R.styleable.GridView_horizontalSpacing, 0); |
| 117 | setHorizontalSpacing(hSpacing); |
| 118 | |
| 119 | int vSpacing = a.getDimensionPixelOffset( |
| 120 | com.android.internal.R.styleable.GridView_verticalSpacing, 0); |
| 121 | setVerticalSpacing(vSpacing); |
| 122 | |
| 123 | int index = a.getInt(com.android.internal.R.styleable.GridView_stretchMode, STRETCH_COLUMN_WIDTH); |
| 124 | if (index >= 0) { |
| 125 | setStretchMode(index); |
| 126 | } |
| 127 | |
| 128 | int columnWidth = a.getDimensionPixelOffset(com.android.internal.R.styleable.GridView_columnWidth, -1); |
| 129 | if (columnWidth > 0) { |
| 130 | setColumnWidth(columnWidth); |
| 131 | } |
| 132 | |
| 133 | int numColumns = a.getInt(com.android.internal.R.styleable.GridView_numColumns, 1); |
| 134 | setNumColumns(numColumns); |
| 135 | |
| 136 | index = a.getInt(com.android.internal.R.styleable.GridView_gravity, -1); |
| 137 | if (index >= 0) { |
| 138 | setGravity(index); |
| 139 | } |
| 140 | |
| 141 | a.recycle(); |
| 142 | } |
| 143 | |
| 144 | @Override |
| 145 | public ListAdapter getAdapter() { |
| 146 | return mAdapter; |
| 147 | } |
| 148 | |
| 149 | /** |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 150 | * Sets up this AbsListView to use a remote views adapter which connects to a RemoteViewsService |
| 151 | * through the specified intent. |
| 152 | * @param intent the intent used to identify the RemoteViewsService for the adapter to connect to. |
| 153 | */ |
| 154 | @android.view.RemotableViewMethod |
| 155 | public void setRemoteViewsAdapter(Intent intent) { |
| 156 | super.setRemoteViewsAdapter(intent); |
| 157 | } |
| 158 | |
| 159 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 160 | * Sets the data behind this GridView. |
| 161 | * |
| 162 | * @param adapter the adapter providing the grid's data |
| 163 | */ |
| 164 | @Override |
| 165 | public void setAdapter(ListAdapter adapter) { |
Romain Guy | df36b05 | 2010-05-19 21:13:20 -0700 | [diff] [blame] | 166 | if (mAdapter != null && mDataSetObserver != null) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 167 | mAdapter.unregisterDataSetObserver(mDataSetObserver); |
| 168 | } |
| 169 | |
| 170 | resetList(); |
| 171 | mRecycler.clear(); |
| 172 | mAdapter = adapter; |
| 173 | |
| 174 | mOldSelectedPosition = INVALID_POSITION; |
| 175 | mOldSelectedRowId = INVALID_ROW_ID; |
Adam Powell | f343e1b | 2010-08-13 18:27:04 -0700 | [diff] [blame] | 176 | |
| 177 | // AbsListView#setAdapter will update choice mode states. |
| 178 | super.setAdapter(adapter); |
| 179 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 180 | if (mAdapter != null) { |
| 181 | mOldItemCount = mItemCount; |
| 182 | mItemCount = mAdapter.getCount(); |
| 183 | mDataChanged = true; |
| 184 | checkFocus(); |
| 185 | |
| 186 | mDataSetObserver = new AdapterDataSetObserver(); |
| 187 | mAdapter.registerDataSetObserver(mDataSetObserver); |
| 188 | |
| 189 | mRecycler.setViewTypeCount(mAdapter.getViewTypeCount()); |
| 190 | |
| 191 | int position; |
| 192 | if (mStackFromBottom) { |
| 193 | position = lookForSelectablePosition(mItemCount - 1, false); |
| 194 | } else { |
| 195 | position = lookForSelectablePosition(0, true); |
| 196 | } |
| 197 | setSelectedPositionInt(position); |
| 198 | setNextSelectedPositionInt(position); |
| 199 | checkSelectionChanged(); |
| 200 | } else { |
| 201 | checkFocus(); |
| 202 | // Nothing selected |
| 203 | checkSelectionChanged(); |
| 204 | } |
| 205 | |
| 206 | requestLayout(); |
| 207 | } |
| 208 | |
| 209 | @Override |
| 210 | int lookForSelectablePosition(int position, boolean lookDown) { |
| 211 | final ListAdapter adapter = mAdapter; |
| 212 | if (adapter == null || isInTouchMode()) { |
| 213 | return INVALID_POSITION; |
| 214 | } |
| 215 | |
| 216 | if (position < 0 || position >= mItemCount) { |
| 217 | return INVALID_POSITION; |
| 218 | } |
| 219 | return position; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * {@inheritDoc} |
| 224 | */ |
| 225 | @Override |
| 226 | void fillGap(boolean down) { |
| 227 | final int numColumns = mNumColumns; |
| 228 | final int verticalSpacing = mVerticalSpacing; |
| 229 | |
| 230 | final int count = getChildCount(); |
| 231 | |
| 232 | if (down) { |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 233 | int paddingTop = 0; |
| 234 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 235 | paddingTop = getListPaddingTop(); |
| 236 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 237 | final int startOffset = count > 0 ? |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 238 | getChildAt(count - 1).getBottom() + verticalSpacing : paddingTop; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 239 | int position = mFirstPosition + count; |
| 240 | if (mStackFromBottom) { |
| 241 | position += numColumns - 1; |
| 242 | } |
| 243 | fillDown(position, startOffset); |
| 244 | correctTooHigh(numColumns, verticalSpacing, getChildCount()); |
| 245 | } else { |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 246 | int paddingBottom = 0; |
| 247 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 248 | paddingBottom = getListPaddingBottom(); |
| 249 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 250 | final int startOffset = count > 0 ? |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 251 | getChildAt(0).getTop() - verticalSpacing : getHeight() - paddingBottom; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 252 | int position = mFirstPosition; |
| 253 | if (!mStackFromBottom) { |
| 254 | position -= numColumns; |
| 255 | } else { |
| 256 | position--; |
| 257 | } |
| 258 | fillUp(position, startOffset); |
| 259 | correctTooLow(numColumns, verticalSpacing, getChildCount()); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Fills the list from pos down to the end of the list view. |
| 265 | * |
| 266 | * @param pos The first position to put in the list |
| 267 | * |
| 268 | * @param nextTop The location where the top of the item associated with pos |
| 269 | * should be drawn |
| 270 | * |
| 271 | * @return The view that is currently selected, if it happens to be in the |
| 272 | * range that we draw. |
| 273 | */ |
| 274 | private View fillDown(int pos, int nextTop) { |
| 275 | View selectedView = null; |
| 276 | |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 277 | int end = (mBottom - mTop); |
| 278 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 279 | end -= mListPadding.bottom; |
| 280 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 281 | |
| 282 | while (nextTop < end && pos < mItemCount) { |
| 283 | View temp = makeRow(pos, nextTop, true); |
| 284 | if (temp != null) { |
| 285 | selectedView = temp; |
| 286 | } |
| 287 | |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 288 | // mReferenceView will change with each call to makeRow() |
| 289 | // do not cache in a local variable outside of this loop |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 290 | nextTop = mReferenceView.getBottom() + mVerticalSpacing; |
| 291 | |
| 292 | pos += mNumColumns; |
| 293 | } |
| 294 | |
Adam Cohen | b967392 | 2012-01-05 13:58:47 -0800 | [diff] [blame] | 295 | setVisibleRangeHint(mFirstPosition, mFirstPosition + getChildCount() - 1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 296 | return selectedView; |
| 297 | } |
| 298 | |
| 299 | private View makeRow(int startPos, int y, boolean flow) { |
| 300 | final int columnWidth = mColumnWidth; |
| 301 | final int horizontalSpacing = mHorizontalSpacing; |
| 302 | |
Fabrice Di Meglio | a598720 | 2012-06-08 15:22:20 -0700 | [diff] [blame] | 303 | final boolean isLayoutRtl = isLayoutRtl(); |
| 304 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 305 | int last; |
Fabrice Di Meglio | a598720 | 2012-06-08 15:22:20 -0700 | [diff] [blame] | 306 | int nextLeft; |
| 307 | |
| 308 | if (isLayoutRtl) { |
| 309 | nextLeft = getWidth() - mListPadding.right - columnWidth - |
| 310 | ((mStretchMode == STRETCH_SPACING_UNIFORM) ? horizontalSpacing : 0); |
| 311 | } else { |
| 312 | nextLeft = mListPadding.left + |
| 313 | ((mStretchMode == STRETCH_SPACING_UNIFORM) ? horizontalSpacing : 0); |
| 314 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 315 | |
| 316 | if (!mStackFromBottom) { |
| 317 | last = Math.min(startPos + mNumColumns, mItemCount); |
| 318 | } else { |
| 319 | last = startPos + 1; |
| 320 | startPos = Math.max(0, startPos - mNumColumns + 1); |
| 321 | |
| 322 | if (last - startPos < mNumColumns) { |
Fabrice Di Meglio | a598720 | 2012-06-08 15:22:20 -0700 | [diff] [blame] | 323 | final int deltaLeft = (mNumColumns - (last - startPos)) * (columnWidth + horizontalSpacing); |
| 324 | nextLeft += (isLayoutRtl ? -1 : +1) * deltaLeft; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 325 | } |
| 326 | } |
| 327 | |
| 328 | View selectedView = null; |
| 329 | |
| 330 | final boolean hasFocus = shouldShowSelector(); |
| 331 | final boolean inClick = touchModeDrawsInPressedState(); |
| 332 | final int selectedPosition = mSelectedPosition; |
| 333 | |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 334 | View child = null; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 335 | for (int pos = startPos; pos < last; pos++) { |
| 336 | // is this the selected item? |
| 337 | boolean selected = pos == selectedPosition; |
| 338 | // does the list view have focus or contain focus |
| 339 | |
| 340 | final int where = flow ? -1 : pos - startPos; |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 341 | child = makeAndAddView(pos, y, flow, nextLeft, selected, where); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 342 | |
Fabrice Di Meglio | a598720 | 2012-06-08 15:22:20 -0700 | [diff] [blame] | 343 | nextLeft += (isLayoutRtl ? -1 : +1) * columnWidth; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 344 | if (pos < last - 1) { |
| 345 | nextLeft += horizontalSpacing; |
| 346 | } |
| 347 | |
| 348 | if (selected && (hasFocus || inClick)) { |
| 349 | selectedView = child; |
| 350 | } |
| 351 | } |
| 352 | |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 353 | mReferenceView = child; |
| 354 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 355 | if (selectedView != null) { |
| 356 | mReferenceViewInSelectedRow = mReferenceView; |
| 357 | } |
| 358 | |
| 359 | return selectedView; |
| 360 | } |
| 361 | |
| 362 | /** |
| 363 | * Fills the list from pos up to the top of the list view. |
| 364 | * |
| 365 | * @param pos The first position to put in the list |
| 366 | * |
| 367 | * @param nextBottom The location where the bottom of the item associated |
| 368 | * with pos should be drawn |
| 369 | * |
| 370 | * @return The view that is currently selected |
| 371 | */ |
| 372 | private View fillUp(int pos, int nextBottom) { |
| 373 | View selectedView = null; |
| 374 | |
Adam Powell | 8c3e0fc | 2010-11-17 15:13:51 -0800 | [diff] [blame] | 375 | int end = 0; |
| 376 | if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { |
| 377 | end = mListPadding.top; |
| 378 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 379 | |
| 380 | while (nextBottom > end && pos >= 0) { |
| 381 | |
| 382 | View temp = makeRow(pos, nextBottom, false); |
| 383 | if (temp != null) { |
| 384 | selectedView = temp; |
| 385 | } |
| 386 | |
| 387 | nextBottom = mReferenceView.getTop() - mVerticalSpacing; |
| 388 | |
| 389 | mFirstPosition = pos; |
| 390 | |
| 391 | pos -= mNumColumns; |
| 392 | } |
| 393 | |
| 394 | if (mStackFromBottom) { |
| 395 | mFirstPosition = Math.max(0, pos + 1); |
| 396 | } |
| 397 | |
Adam Cohen | b967392 | 2012-01-05 13:58:47 -0800 | [diff] [blame] | 398 | setVisibleRangeHint(mFirstPosition, mFirstPosition + getChildCount() - 1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 399 | return selectedView; |
| 400 | } |
| 401 | |
| 402 | /** |
| 403 | * Fills the list from top to bottom, starting with mFirstPosition |
| 404 | * |
| 405 | * @param nextTop The location where the top of the first item should be |
| 406 | * drawn |
| 407 | * |
| 408 | * @return The view that is currently selected |
| 409 | */ |
| 410 | private View fillFromTop(int nextTop) { |
| 411 | mFirstPosition = Math.min(mFirstPosition, mSelectedPosition); |
| 412 | mFirstPosition = Math.min(mFirstPosition, mItemCount - 1); |
| 413 | if (mFirstPosition < 0) { |
| 414 | mFirstPosition = 0; |
| 415 | } |
| 416 | mFirstPosition -= mFirstPosition % mNumColumns; |
| 417 | return fillDown(mFirstPosition, nextTop); |
| 418 | } |
| 419 | |
| 420 | private View fillFromBottom(int lastPosition, int nextBottom) { |
| 421 | lastPosition = Math.max(lastPosition, mSelectedPosition); |
| 422 | lastPosition = Math.min(lastPosition, mItemCount - 1); |
| 423 | |
| 424 | final int invertedPosition = mItemCount - 1 - lastPosition; |
| 425 | lastPosition = mItemCount - 1 - (invertedPosition - (invertedPosition % mNumColumns)); |
| 426 | |
| 427 | return fillUp(lastPosition, nextBottom); |
| 428 | } |
| 429 | |
| 430 | private View fillSelection(int childrenTop, int childrenBottom) { |
| 431 | final int selectedPosition = reconcileSelectedPosition(); |
| 432 | final int numColumns = mNumColumns; |
| 433 | final int verticalSpacing = mVerticalSpacing; |
| 434 | |
| 435 | int rowStart; |
| 436 | int rowEnd = -1; |
| 437 | |
| 438 | if (!mStackFromBottom) { |
| 439 | rowStart = selectedPosition - (selectedPosition % numColumns); |
| 440 | } else { |
| 441 | final int invertedSelection = mItemCount - 1 - selectedPosition; |
| 442 | |
| 443 | rowEnd = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 444 | rowStart = Math.max(0, rowEnd - numColumns + 1); |
| 445 | } |
| 446 | |
| 447 | final int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 448 | final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, rowStart); |
| 449 | |
| 450 | final View sel = makeRow(mStackFromBottom ? rowEnd : rowStart, topSelectionPixel, true); |
| 451 | mFirstPosition = rowStart; |
| 452 | |
| 453 | final View referenceView = mReferenceView; |
| 454 | |
| 455 | if (!mStackFromBottom) { |
| 456 | fillDown(rowStart + numColumns, referenceView.getBottom() + verticalSpacing); |
| 457 | pinToBottom(childrenBottom); |
| 458 | fillUp(rowStart - numColumns, referenceView.getTop() - verticalSpacing); |
| 459 | adjustViewsUpOrDown(); |
| 460 | } else { |
| 461 | final int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, |
| 462 | fadingEdgeLength, numColumns, rowStart); |
| 463 | final int offset = bottomSelectionPixel - referenceView.getBottom(); |
| 464 | offsetChildrenTopAndBottom(offset); |
| 465 | fillUp(rowStart - 1, referenceView.getTop() - verticalSpacing); |
| 466 | pinToTop(childrenTop); |
| 467 | fillDown(rowEnd + numColumns, referenceView.getBottom() + verticalSpacing); |
| 468 | adjustViewsUpOrDown(); |
| 469 | } |
| 470 | |
| 471 | return sel; |
| 472 | } |
| 473 | |
| 474 | private void pinToTop(int childrenTop) { |
| 475 | if (mFirstPosition == 0) { |
| 476 | final int top = getChildAt(0).getTop(); |
| 477 | final int offset = childrenTop - top; |
| 478 | if (offset < 0) { |
| 479 | offsetChildrenTopAndBottom(offset); |
| 480 | } |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | private void pinToBottom(int childrenBottom) { |
| 485 | final int count = getChildCount(); |
| 486 | if (mFirstPosition + count == mItemCount) { |
| 487 | final int bottom = getChildAt(count - 1).getBottom(); |
| 488 | final int offset = childrenBottom - bottom; |
| 489 | if (offset > 0) { |
| 490 | offsetChildrenTopAndBottom(offset); |
| 491 | } |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | @Override |
| 496 | int findMotionRow(int y) { |
| 497 | final int childCount = getChildCount(); |
| 498 | if (childCount > 0) { |
| 499 | |
| 500 | final int numColumns = mNumColumns; |
| 501 | if (!mStackFromBottom) { |
| 502 | for (int i = 0; i < childCount; i += numColumns) { |
| 503 | if (y <= getChildAt(i).getBottom()) { |
| 504 | return mFirstPosition + i; |
| 505 | } |
| 506 | } |
| 507 | } else { |
| 508 | for (int i = childCount - 1; i >= 0; i -= numColumns) { |
| 509 | if (y >= getChildAt(i).getTop()) { |
| 510 | return mFirstPosition + i; |
| 511 | } |
| 512 | } |
| 513 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 514 | } |
| 515 | return INVALID_POSITION; |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * Layout during a scroll that results from tracking motion events. Places |
| 520 | * the mMotionPosition view at the offset specified by mMotionViewTop, and |
| 521 | * then build surrounding views from there. |
| 522 | * |
| 523 | * @param position the position at which to start filling |
| 524 | * @param top the top of the view at that position |
| 525 | * @return The selected view, or null if the selected view is outside the |
| 526 | * visible area. |
| 527 | */ |
| 528 | private View fillSpecific(int position, int top) { |
| 529 | final int numColumns = mNumColumns; |
| 530 | |
| 531 | int motionRowStart; |
| 532 | int motionRowEnd = -1; |
| 533 | |
| 534 | if (!mStackFromBottom) { |
| 535 | motionRowStart = position - (position % numColumns); |
| 536 | } else { |
| 537 | final int invertedSelection = mItemCount - 1 - position; |
| 538 | |
| 539 | motionRowEnd = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 540 | motionRowStart = Math.max(0, motionRowEnd - numColumns + 1); |
| 541 | } |
| 542 | |
| 543 | final View temp = makeRow(mStackFromBottom ? motionRowEnd : motionRowStart, top, true); |
| 544 | |
| 545 | // Possibly changed again in fillUp if we add rows above this one. |
| 546 | mFirstPosition = motionRowStart; |
| 547 | |
| 548 | final View referenceView = mReferenceView; |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 549 | // We didn't have anything to layout, bail out |
| 550 | if (referenceView == null) { |
| 551 | return null; |
| 552 | } |
| 553 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 554 | final int verticalSpacing = mVerticalSpacing; |
| 555 | |
| 556 | View above; |
| 557 | View below; |
| 558 | |
| 559 | if (!mStackFromBottom) { |
| 560 | above = fillUp(motionRowStart - numColumns, referenceView.getTop() - verticalSpacing); |
| 561 | adjustViewsUpOrDown(); |
| 562 | below = fillDown(motionRowStart + numColumns, referenceView.getBottom() + verticalSpacing); |
| 563 | // Check if we have dragged the bottom of the grid too high |
| 564 | final int childCount = getChildCount(); |
| 565 | if (childCount > 0) { |
| 566 | correctTooHigh(numColumns, verticalSpacing, childCount); |
| 567 | } |
| 568 | } else { |
| 569 | below = fillDown(motionRowEnd + numColumns, referenceView.getBottom() + verticalSpacing); |
| 570 | adjustViewsUpOrDown(); |
| 571 | above = fillUp(motionRowStart - 1, referenceView.getTop() - verticalSpacing); |
| 572 | // Check if we have dragged the bottom of the grid too high |
| 573 | final int childCount = getChildCount(); |
| 574 | if (childCount > 0) { |
| 575 | correctTooLow(numColumns, verticalSpacing, childCount); |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | if (temp != null) { |
| 580 | return temp; |
| 581 | } else if (above != null) { |
| 582 | return above; |
| 583 | } else { |
| 584 | return below; |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | private void correctTooHigh(int numColumns, int verticalSpacing, int childCount) { |
| 589 | // First see if the last item is visible |
| 590 | final int lastPosition = mFirstPosition + childCount - 1; |
| 591 | if (lastPosition == mItemCount - 1 && childCount > 0) { |
| 592 | // Get the last child ... |
| 593 | final View lastChild = getChildAt(childCount - 1); |
| 594 | |
| 595 | // ... and its bottom edge |
| 596 | final int lastBottom = lastChild.getBottom(); |
| 597 | // This is bottom of our drawable area |
| 598 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 599 | |
| 600 | // This is how far the bottom edge of the last view is from the bottom of the |
| 601 | // drawable area |
| 602 | int bottomOffset = end - lastBottom; |
| 603 | |
| 604 | final View firstChild = getChildAt(0); |
| 605 | final int firstTop = firstChild.getTop(); |
| 606 | |
| 607 | // Make sure we are 1) Too high, and 2) Either there are more rows above the |
| 608 | // first row or the first row is scrolled off the top of the drawable area |
| 609 | if (bottomOffset > 0 && (mFirstPosition > 0 || firstTop < mListPadding.top)) { |
| 610 | if (mFirstPosition == 0) { |
| 611 | // Don't pull the top too far down |
| 612 | bottomOffset = Math.min(bottomOffset, mListPadding.top - firstTop); |
| 613 | } |
| 614 | |
| 615 | // Move everything down |
| 616 | offsetChildrenTopAndBottom(bottomOffset); |
| 617 | if (mFirstPosition > 0) { |
| 618 | // Fill the gap that was opened above mFirstPosition with more rows, if |
| 619 | // possible |
| 620 | fillUp(mFirstPosition - (mStackFromBottom ? 1 : numColumns), |
| 621 | firstChild.getTop() - verticalSpacing); |
| 622 | // Close up the remaining gap |
| 623 | adjustViewsUpOrDown(); |
| 624 | } |
| 625 | } |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | private void correctTooLow(int numColumns, int verticalSpacing, int childCount) { |
| 630 | if (mFirstPosition == 0 && childCount > 0) { |
| 631 | // Get the first child ... |
| 632 | final View firstChild = getChildAt(0); |
| 633 | |
| 634 | // ... and its top edge |
| 635 | final int firstTop = firstChild.getTop(); |
| 636 | |
| 637 | // This is top of our drawable area |
| 638 | final int start = mListPadding.top; |
| 639 | |
| 640 | // This is bottom of our drawable area |
| 641 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 642 | |
| 643 | // This is how far the top edge of the first view is from the top of the |
| 644 | // drawable area |
| 645 | int topOffset = firstTop - start; |
| 646 | final View lastChild = getChildAt(childCount - 1); |
| 647 | final int lastBottom = lastChild.getBottom(); |
| 648 | final int lastPosition = mFirstPosition + childCount - 1; |
| 649 | |
| 650 | // Make sure we are 1) Too low, and 2) Either there are more rows below the |
| 651 | // last row or the last row is scrolled off the bottom of the drawable area |
| 652 | if (topOffset > 0 && (lastPosition < mItemCount - 1 || lastBottom > end)) { |
| 653 | if (lastPosition == mItemCount - 1 ) { |
| 654 | // Don't pull the bottom too far up |
| 655 | topOffset = Math.min(topOffset, lastBottom - end); |
| 656 | } |
| 657 | |
| 658 | // Move everything up |
| 659 | offsetChildrenTopAndBottom(-topOffset); |
| 660 | if (lastPosition < mItemCount - 1) { |
| 661 | // Fill the gap that was opened below the last position with more rows, if |
| 662 | // possible |
| 663 | fillDown(lastPosition + (!mStackFromBottom ? 1 : numColumns), |
| 664 | lastChild.getBottom() + verticalSpacing); |
| 665 | // Close up the remaining gap |
| 666 | adjustViewsUpOrDown(); |
| 667 | } |
| 668 | } |
| 669 | } |
| 670 | } |
| 671 | |
| 672 | /** |
| 673 | * Fills the grid based on positioning the new selection at a specific |
| 674 | * location. The selection may be moved so that it does not intersect the |
| 675 | * faded edges. The grid is then filled upwards and downwards from there. |
| 676 | * |
| 677 | * @param selectedTop Where the selected item should be |
| 678 | * @param childrenTop Where to start drawing children |
| 679 | * @param childrenBottom Last pixel where children can be drawn |
| 680 | * @return The view that currently has selection |
| 681 | */ |
| 682 | private View fillFromSelection(int selectedTop, int childrenTop, int childrenBottom) { |
| 683 | final int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 684 | final int selectedPosition = mSelectedPosition; |
| 685 | final int numColumns = mNumColumns; |
| 686 | final int verticalSpacing = mVerticalSpacing; |
| 687 | |
| 688 | int rowStart; |
| 689 | int rowEnd = -1; |
| 690 | |
| 691 | if (!mStackFromBottom) { |
| 692 | rowStart = selectedPosition - (selectedPosition % numColumns); |
| 693 | } else { |
| 694 | int invertedSelection = mItemCount - 1 - selectedPosition; |
| 695 | |
| 696 | rowEnd = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 697 | rowStart = Math.max(0, rowEnd - numColumns + 1); |
| 698 | } |
| 699 | |
| 700 | View sel; |
| 701 | View referenceView; |
| 702 | |
| 703 | int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, rowStart); |
| 704 | int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, fadingEdgeLength, |
| 705 | numColumns, rowStart); |
| 706 | |
| 707 | sel = makeRow(mStackFromBottom ? rowEnd : rowStart, selectedTop, true); |
| 708 | // Possibly changed again in fillUp if we add rows above this one. |
| 709 | mFirstPosition = rowStart; |
| 710 | |
| 711 | referenceView = mReferenceView; |
| 712 | adjustForTopFadingEdge(referenceView, topSelectionPixel, bottomSelectionPixel); |
| 713 | adjustForBottomFadingEdge(referenceView, topSelectionPixel, bottomSelectionPixel); |
| 714 | |
| 715 | if (!mStackFromBottom) { |
| 716 | fillUp(rowStart - numColumns, referenceView.getTop() - verticalSpacing); |
| 717 | adjustViewsUpOrDown(); |
| 718 | fillDown(rowStart + numColumns, referenceView.getBottom() + verticalSpacing); |
| 719 | } else { |
| 720 | fillDown(rowEnd + numColumns, referenceView.getBottom() + verticalSpacing); |
| 721 | adjustViewsUpOrDown(); |
| 722 | fillUp(rowStart - 1, referenceView.getTop() - verticalSpacing); |
| 723 | } |
| 724 | |
| 725 | |
| 726 | return sel; |
| 727 | } |
| 728 | |
| 729 | /** |
| 730 | * Calculate the bottom-most pixel we can draw the selection into |
| 731 | * |
| 732 | * @param childrenBottom Bottom pixel were children can be drawn |
| 733 | * @param fadingEdgeLength Length of the fading edge in pixels, if present |
| 734 | * @param numColumns Number of columns in the grid |
| 735 | * @param rowStart The start of the row that will contain the selection |
| 736 | * @return The bottom-most pixel we can draw the selection into |
| 737 | */ |
| 738 | private int getBottomSelectionPixel(int childrenBottom, int fadingEdgeLength, |
| 739 | int numColumns, int rowStart) { |
| 740 | // Last pixel we can draw the selection into |
| 741 | int bottomSelectionPixel = childrenBottom; |
| 742 | if (rowStart + numColumns - 1 < mItemCount - 1) { |
| 743 | bottomSelectionPixel -= fadingEdgeLength; |
| 744 | } |
| 745 | return bottomSelectionPixel; |
| 746 | } |
| 747 | |
| 748 | /** |
| 749 | * Calculate the top-most pixel we can draw the selection into |
| 750 | * |
| 751 | * @param childrenTop Top pixel were children can be drawn |
| 752 | * @param fadingEdgeLength Length of the fading edge in pixels, if present |
| 753 | * @param rowStart The start of the row that will contain the selection |
| 754 | * @return The top-most pixel we can draw the selection into |
| 755 | */ |
| 756 | private int getTopSelectionPixel(int childrenTop, int fadingEdgeLength, int rowStart) { |
| 757 | // first pixel we can draw the selection into |
| 758 | int topSelectionPixel = childrenTop; |
| 759 | if (rowStart > 0) { |
| 760 | topSelectionPixel += fadingEdgeLength; |
| 761 | } |
| 762 | return topSelectionPixel; |
| 763 | } |
| 764 | |
| 765 | /** |
| 766 | * Move all views upwards so the selected row does not interesect the bottom |
| 767 | * fading edge (if necessary). |
| 768 | * |
| 769 | * @param childInSelectedRow A child in the row that contains the selection |
| 770 | * @param topSelectionPixel The topmost pixel we can draw the selection into |
| 771 | * @param bottomSelectionPixel The bottommost pixel we can draw the |
| 772 | * selection into |
| 773 | */ |
| 774 | private void adjustForBottomFadingEdge(View childInSelectedRow, |
| 775 | int topSelectionPixel, int bottomSelectionPixel) { |
| 776 | // Some of the newly selected item extends below the bottom of the |
| 777 | // list |
| 778 | if (childInSelectedRow.getBottom() > bottomSelectionPixel) { |
| 779 | |
| 780 | // Find space available above the selection into which we can |
| 781 | // scroll upwards |
| 782 | int spaceAbove = childInSelectedRow.getTop() - topSelectionPixel; |
| 783 | |
| 784 | // Find space required to bring the bottom of the selected item |
| 785 | // fully into view |
| 786 | int spaceBelow = childInSelectedRow.getBottom() - bottomSelectionPixel; |
| 787 | int offset = Math.min(spaceAbove, spaceBelow); |
| 788 | |
| 789 | // Now offset the selected item to get it into view |
| 790 | offsetChildrenTopAndBottom(-offset); |
| 791 | } |
| 792 | } |
| 793 | |
| 794 | /** |
| 795 | * Move all views upwards so the selected row does not interesect the top |
| 796 | * fading edge (if necessary). |
| 797 | * |
| 798 | * @param childInSelectedRow A child in the row that contains the selection |
| 799 | * @param topSelectionPixel The topmost pixel we can draw the selection into |
| 800 | * @param bottomSelectionPixel The bottommost pixel we can draw the |
| 801 | * selection into |
| 802 | */ |
| 803 | private void adjustForTopFadingEdge(View childInSelectedRow, |
| 804 | int topSelectionPixel, int bottomSelectionPixel) { |
| 805 | // Some of the newly selected item extends above the top of the list |
| 806 | if (childInSelectedRow.getTop() < topSelectionPixel) { |
| 807 | // Find space required to bring the top of the selected item |
| 808 | // fully into view |
| 809 | int spaceAbove = topSelectionPixel - childInSelectedRow.getTop(); |
| 810 | |
| 811 | // Find space available below the selection into which we can |
| 812 | // scroll downwards |
| 813 | int spaceBelow = bottomSelectionPixel - childInSelectedRow.getBottom(); |
| 814 | int offset = Math.min(spaceAbove, spaceBelow); |
| 815 | |
| 816 | // Now offset the selected item to get it into view |
| 817 | offsetChildrenTopAndBottom(offset); |
| 818 | } |
| 819 | } |
| 820 | |
| 821 | /** |
Winson Chung | 499cb9f | 2010-07-16 11:18:17 -0700 | [diff] [blame] | 822 | * Smoothly scroll to the specified adapter position. The view will |
| 823 | * scroll such that the indicated position is displayed. |
| 824 | * @param position Scroll to this adapter position. |
| 825 | */ |
| 826 | @android.view.RemotableViewMethod |
| 827 | public void smoothScrollToPosition(int position) { |
| 828 | super.smoothScrollToPosition(position); |
| 829 | } |
| 830 | |
| 831 | /** |
| 832 | * Smoothly scroll to the specified adapter position offset. The view will |
| 833 | * scroll such that the indicated position is displayed. |
| 834 | * @param offset The amount to offset from the adapter position to scroll to. |
| 835 | */ |
| 836 | @android.view.RemotableViewMethod |
| 837 | public void smoothScrollByOffset(int offset) { |
| 838 | super.smoothScrollByOffset(offset); |
| 839 | } |
| 840 | |
| 841 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 842 | * Fills the grid based on positioning the new selection relative to the old |
| 843 | * selection. The new selection will be placed at, above, or below the |
| 844 | * location of the new selection depending on how the selection is moving. |
| 845 | * The selection will then be pinned to the visible part of the screen, |
| 846 | * excluding the edges that are faded. The grid is then filled upwards and |
| 847 | * downwards from there. |
| 848 | * |
| 849 | * @param delta Which way we are moving |
| 850 | * @param childrenTop Where to start drawing children |
| 851 | * @param childrenBottom Last pixel where children can be drawn |
| 852 | * @return The view that currently has selection |
| 853 | */ |
| 854 | private View moveSelection(int delta, int childrenTop, int childrenBottom) { |
| 855 | final int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 856 | final int selectedPosition = mSelectedPosition; |
| 857 | final int numColumns = mNumColumns; |
| 858 | final int verticalSpacing = mVerticalSpacing; |
| 859 | |
| 860 | int oldRowStart; |
| 861 | int rowStart; |
| 862 | int rowEnd = -1; |
| 863 | |
| 864 | if (!mStackFromBottom) { |
| 865 | oldRowStart = (selectedPosition - delta) - ((selectedPosition - delta) % numColumns); |
| 866 | |
| 867 | rowStart = selectedPosition - (selectedPosition % numColumns); |
| 868 | } else { |
| 869 | int invertedSelection = mItemCount - 1 - selectedPosition; |
| 870 | |
| 871 | rowEnd = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 872 | rowStart = Math.max(0, rowEnd - numColumns + 1); |
| 873 | |
| 874 | invertedSelection = mItemCount - 1 - (selectedPosition - delta); |
| 875 | oldRowStart = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 876 | oldRowStart = Math.max(0, oldRowStart - numColumns + 1); |
| 877 | } |
| 878 | |
| 879 | final int rowDelta = rowStart - oldRowStart; |
| 880 | |
| 881 | final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, rowStart); |
| 882 | final int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, fadingEdgeLength, |
| 883 | numColumns, rowStart); |
| 884 | |
| 885 | // Possibly changed again in fillUp if we add rows above this one. |
| 886 | mFirstPosition = rowStart; |
| 887 | |
| 888 | View sel; |
| 889 | View referenceView; |
| 890 | |
| 891 | if (rowDelta > 0) { |
| 892 | /* |
| 893 | * Case 1: Scrolling down. |
| 894 | */ |
| 895 | |
| 896 | final int oldBottom = mReferenceViewInSelectedRow == null ? 0 : |
| 897 | mReferenceViewInSelectedRow.getBottom(); |
| 898 | |
| 899 | sel = makeRow(mStackFromBottom ? rowEnd : rowStart, oldBottom + verticalSpacing, true); |
| 900 | referenceView = mReferenceView; |
| 901 | |
| 902 | adjustForBottomFadingEdge(referenceView, topSelectionPixel, bottomSelectionPixel); |
| 903 | } else if (rowDelta < 0) { |
| 904 | /* |
| 905 | * Case 2: Scrolling up. |
| 906 | */ |
| 907 | final int oldTop = mReferenceViewInSelectedRow == null ? |
| 908 | 0 : mReferenceViewInSelectedRow .getTop(); |
| 909 | |
| 910 | sel = makeRow(mStackFromBottom ? rowEnd : rowStart, oldTop - verticalSpacing, false); |
| 911 | referenceView = mReferenceView; |
| 912 | |
| 913 | adjustForTopFadingEdge(referenceView, topSelectionPixel, bottomSelectionPixel); |
| 914 | } else { |
| 915 | /* |
| 916 | * Keep selection where it was |
| 917 | */ |
| 918 | final int oldTop = mReferenceViewInSelectedRow == null ? |
| 919 | 0 : mReferenceViewInSelectedRow .getTop(); |
| 920 | |
| 921 | sel = makeRow(mStackFromBottom ? rowEnd : rowStart, oldTop, true); |
| 922 | referenceView = mReferenceView; |
| 923 | } |
| 924 | |
| 925 | if (!mStackFromBottom) { |
| 926 | fillUp(rowStart - numColumns, referenceView.getTop() - verticalSpacing); |
| 927 | adjustViewsUpOrDown(); |
| 928 | fillDown(rowStart + numColumns, referenceView.getBottom() + verticalSpacing); |
| 929 | } else { |
| 930 | fillDown(rowEnd + numColumns, referenceView.getBottom() + verticalSpacing); |
| 931 | adjustViewsUpOrDown(); |
| 932 | fillUp(rowStart - 1, referenceView.getTop() - verticalSpacing); |
| 933 | } |
| 934 | |
| 935 | return sel; |
| 936 | } |
| 937 | |
Adam Lesinski | edd9508 | 2010-12-08 12:09:06 -0800 | [diff] [blame] | 938 | private boolean determineColumns(int availableSpace) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 939 | final int requestedHorizontalSpacing = mRequestedHorizontalSpacing; |
| 940 | final int stretchMode = mStretchMode; |
| 941 | final int requestedColumnWidth = mRequestedColumnWidth; |
Adam Lesinski | edd9508 | 2010-12-08 12:09:06 -0800 | [diff] [blame] | 942 | boolean didNotInitiallyFit = false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 943 | |
| 944 | if (mRequestedNumColumns == AUTO_FIT) { |
| 945 | if (requestedColumnWidth > 0) { |
| 946 | // Client told us to pick the number of columns |
| 947 | mNumColumns = (availableSpace + requestedHorizontalSpacing) / |
| 948 | (requestedColumnWidth + requestedHorizontalSpacing); |
| 949 | } else { |
| 950 | // Just make up a number if we don't have enough info |
| 951 | mNumColumns = 2; |
| 952 | } |
| 953 | } else { |
| 954 | // We picked the columns |
| 955 | mNumColumns = mRequestedNumColumns; |
| 956 | } |
| 957 | |
| 958 | if (mNumColumns <= 0) { |
| 959 | mNumColumns = 1; |
| 960 | } |
| 961 | |
| 962 | switch (stretchMode) { |
| 963 | case NO_STRETCH: |
| 964 | // Nobody stretches |
| 965 | mColumnWidth = requestedColumnWidth; |
| 966 | mHorizontalSpacing = requestedHorizontalSpacing; |
| 967 | break; |
| 968 | |
| 969 | default: |
| 970 | int spaceLeftOver = availableSpace - (mNumColumns * requestedColumnWidth) - |
| 971 | ((mNumColumns - 1) * requestedHorizontalSpacing); |
Adam Lesinski | edd9508 | 2010-12-08 12:09:06 -0800 | [diff] [blame] | 972 | |
| 973 | if (spaceLeftOver < 0) { |
| 974 | didNotInitiallyFit = true; |
| 975 | } |
| 976 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 977 | switch (stretchMode) { |
| 978 | case STRETCH_COLUMN_WIDTH: |
| 979 | // Stretch the columns |
| 980 | mColumnWidth = requestedColumnWidth + spaceLeftOver / mNumColumns; |
| 981 | mHorizontalSpacing = requestedHorizontalSpacing; |
| 982 | break; |
| 983 | |
| 984 | case STRETCH_SPACING: |
| 985 | // Stretch the spacing between columns |
| 986 | mColumnWidth = requestedColumnWidth; |
| 987 | if (mNumColumns > 1) { |
| 988 | mHorizontalSpacing = requestedHorizontalSpacing + |
| 989 | spaceLeftOver / (mNumColumns - 1); |
| 990 | } else { |
| 991 | mHorizontalSpacing = requestedHorizontalSpacing + spaceLeftOver; |
| 992 | } |
| 993 | break; |
| 994 | |
| 995 | case STRETCH_SPACING_UNIFORM: |
| 996 | // Stretch the spacing between columns |
| 997 | mColumnWidth = requestedColumnWidth; |
| 998 | if (mNumColumns > 1) { |
| 999 | mHorizontalSpacing = requestedHorizontalSpacing + |
| 1000 | spaceLeftOver / (mNumColumns + 1); |
| 1001 | } else { |
| 1002 | mHorizontalSpacing = requestedHorizontalSpacing + spaceLeftOver; |
| 1003 | } |
| 1004 | break; |
| 1005 | } |
| 1006 | |
| 1007 | break; |
| 1008 | } |
Adam Lesinski | edd9508 | 2010-12-08 12:09:06 -0800 | [diff] [blame] | 1009 | return didNotInitiallyFit; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1010 | } |
| 1011 | |
| 1012 | @Override |
| 1013 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 1014 | // Sets up mListPadding |
| 1015 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| 1016 | |
| 1017 | int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| 1018 | int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| 1019 | int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
| 1020 | int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| 1021 | |
| 1022 | if (widthMode == MeasureSpec.UNSPECIFIED) { |
| 1023 | if (mColumnWidth > 0) { |
| 1024 | widthSize = mColumnWidth + mListPadding.left + mListPadding.right; |
| 1025 | } else { |
| 1026 | widthSize = mListPadding.left + mListPadding.right; |
| 1027 | } |
| 1028 | widthSize += getVerticalScrollbarWidth(); |
| 1029 | } |
| 1030 | |
| 1031 | int childWidth = widthSize - mListPadding.left - mListPadding.right; |
Adam Lesinski | edd9508 | 2010-12-08 12:09:06 -0800 | [diff] [blame] | 1032 | boolean didNotInitiallyFit = determineColumns(childWidth); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1033 | |
| 1034 | int childHeight = 0; |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1035 | int childState = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1036 | |
| 1037 | mItemCount = mAdapter == null ? 0 : mAdapter.getCount(); |
| 1038 | final int count = mItemCount; |
| 1039 | if (count > 0) { |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1040 | final View child = obtainView(0, mIsScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1041 | |
Adam Powell | aebd28f | 2012-02-22 10:31:16 -0800 | [diff] [blame] | 1042 | AbsListView.LayoutParams p = (AbsListView.LayoutParams) child.getLayoutParams(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1043 | if (p == null) { |
Adam Powell | aebd28f | 2012-02-22 10:31:16 -0800 | [diff] [blame] | 1044 | p = (AbsListView.LayoutParams) generateDefaultLayoutParams(); |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 1045 | child.setLayoutParams(p); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1046 | } |
| 1047 | p.viewType = mAdapter.getItemViewType(0); |
Romain Guy | 0bf8859 | 2010-03-02 13:38:44 -0800 | [diff] [blame] | 1048 | p.forceAdd = true; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1049 | |
| 1050 | int childHeightSpec = getChildMeasureSpec( |
| 1051 | MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 0, p.height); |
| 1052 | int childWidthSpec = getChildMeasureSpec( |
| 1053 | MeasureSpec.makeMeasureSpec(mColumnWidth, MeasureSpec.EXACTLY), 0, p.width); |
| 1054 | child.measure(childWidthSpec, childHeightSpec); |
| 1055 | |
| 1056 | childHeight = child.getMeasuredHeight(); |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1057 | childState = combineMeasuredStates(childState, child.getMeasuredState()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1058 | |
| 1059 | if (mRecycler.shouldRecycleViewType(p.viewType)) { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1060 | mRecycler.addScrapView(child, -1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1061 | } |
| 1062 | } |
| 1063 | |
| 1064 | if (heightMode == MeasureSpec.UNSPECIFIED) { |
| 1065 | heightSize = mListPadding.top + mListPadding.bottom + childHeight + |
| 1066 | getVerticalFadingEdgeLength() * 2; |
| 1067 | } |
| 1068 | |
| 1069 | if (heightMode == MeasureSpec.AT_MOST) { |
| 1070 | int ourSize = mListPadding.top + mListPadding.bottom; |
| 1071 | |
| 1072 | final int numColumns = mNumColumns; |
| 1073 | for (int i = 0; i < count; i += numColumns) { |
| 1074 | ourSize += childHeight; |
| 1075 | if (i + numColumns < count) { |
| 1076 | ourSize += mVerticalSpacing; |
| 1077 | } |
| 1078 | if (ourSize >= heightSize) { |
| 1079 | ourSize = heightSize; |
| 1080 | break; |
| 1081 | } |
| 1082 | } |
| 1083 | heightSize = ourSize; |
| 1084 | } |
| 1085 | |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1086 | if (widthMode == MeasureSpec.AT_MOST && mRequestedNumColumns != AUTO_FIT) { |
| 1087 | int ourSize = (mRequestedNumColumns*mColumnWidth) |
| 1088 | + ((mRequestedNumColumns-1)*mHorizontalSpacing) |
| 1089 | + mListPadding.left + mListPadding.right; |
Adam Lesinski | edd9508 | 2010-12-08 12:09:06 -0800 | [diff] [blame] | 1090 | if (ourSize > widthSize || didNotInitiallyFit) { |
Dianne Hackborn | 189ee18 | 2010-12-02 21:48:53 -0800 | [diff] [blame] | 1091 | widthSize |= MEASURED_STATE_TOO_SMALL; |
| 1092 | } |
| 1093 | } |
| 1094 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1095 | setMeasuredDimension(widthSize, heightSize); |
| 1096 | mWidthMeasureSpec = widthMeasureSpec; |
| 1097 | } |
| 1098 | |
| 1099 | @Override |
| 1100 | protected void attachLayoutAnimationParameters(View child, |
| 1101 | ViewGroup.LayoutParams params, int index, int count) { |
| 1102 | |
| 1103 | GridLayoutAnimationController.AnimationParameters animationParams = |
| 1104 | (GridLayoutAnimationController.AnimationParameters) params.layoutAnimationParameters; |
| 1105 | |
| 1106 | if (animationParams == null) { |
| 1107 | animationParams = new GridLayoutAnimationController.AnimationParameters(); |
| 1108 | params.layoutAnimationParameters = animationParams; |
| 1109 | } |
| 1110 | |
| 1111 | animationParams.count = count; |
| 1112 | animationParams.index = index; |
| 1113 | animationParams.columnsCount = mNumColumns; |
| 1114 | animationParams.rowsCount = count / mNumColumns; |
| 1115 | |
| 1116 | if (!mStackFromBottom) { |
| 1117 | animationParams.column = index % mNumColumns; |
| 1118 | animationParams.row = index / mNumColumns; |
| 1119 | } else { |
| 1120 | final int invertedIndex = count - 1 - index; |
| 1121 | |
| 1122 | animationParams.column = mNumColumns - 1 - (invertedIndex % mNumColumns); |
| 1123 | animationParams.row = animationParams.rowsCount - 1 - invertedIndex / mNumColumns; |
| 1124 | } |
| 1125 | } |
| 1126 | |
| 1127 | @Override |
| 1128 | protected void layoutChildren() { |
| 1129 | final boolean blockLayoutRequests = mBlockLayoutRequests; |
| 1130 | if (!blockLayoutRequests) { |
| 1131 | mBlockLayoutRequests = true; |
| 1132 | } |
| 1133 | |
| 1134 | try { |
| 1135 | super.layoutChildren(); |
| 1136 | |
| 1137 | invalidate(); |
| 1138 | |
| 1139 | if (mAdapter == null) { |
| 1140 | resetList(); |
| 1141 | invokeOnItemScrollListener(); |
| 1142 | return; |
| 1143 | } |
| 1144 | |
| 1145 | final int childrenTop = mListPadding.top; |
| 1146 | final int childrenBottom = mBottom - mTop - mListPadding.bottom; |
| 1147 | |
| 1148 | int childCount = getChildCount(); |
| 1149 | int index; |
| 1150 | int delta = 0; |
| 1151 | |
| 1152 | View sel; |
| 1153 | View oldSel = null; |
| 1154 | View oldFirst = null; |
| 1155 | View newSel = null; |
| 1156 | |
| 1157 | // Remember stuff we will need down below |
| 1158 | switch (mLayoutMode) { |
| 1159 | case LAYOUT_SET_SELECTION: |
| 1160 | index = mNextSelectedPosition - mFirstPosition; |
| 1161 | if (index >= 0 && index < childCount) { |
| 1162 | newSel = getChildAt(index); |
| 1163 | } |
| 1164 | break; |
| 1165 | case LAYOUT_FORCE_TOP: |
| 1166 | case LAYOUT_FORCE_BOTTOM: |
| 1167 | case LAYOUT_SPECIFIC: |
| 1168 | case LAYOUT_SYNC: |
| 1169 | break; |
| 1170 | case LAYOUT_MOVE_SELECTION: |
| 1171 | if (mNextSelectedPosition >= 0) { |
| 1172 | delta = mNextSelectedPosition - mSelectedPosition; |
| 1173 | } |
| 1174 | break; |
| 1175 | default: |
| 1176 | // Remember the previously selected view |
| 1177 | index = mSelectedPosition - mFirstPosition; |
| 1178 | if (index >= 0 && index < childCount) { |
| 1179 | oldSel = getChildAt(index); |
| 1180 | } |
| 1181 | |
| 1182 | // Remember the previous first child |
| 1183 | oldFirst = getChildAt(0); |
| 1184 | } |
| 1185 | |
| 1186 | boolean dataChanged = mDataChanged; |
| 1187 | if (dataChanged) { |
| 1188 | handleDataChanged(); |
| 1189 | } |
| 1190 | |
| 1191 | // Handle the empty set by removing all views that are visible |
| 1192 | // and calling it a day |
| 1193 | if (mItemCount == 0) { |
| 1194 | resetList(); |
| 1195 | invokeOnItemScrollListener(); |
| 1196 | return; |
| 1197 | } |
| 1198 | |
| 1199 | setSelectedPositionInt(mNextSelectedPosition); |
| 1200 | |
| 1201 | // Pull all children into the RecycleBin. |
| 1202 | // These views will be reused if possible |
| 1203 | final int firstPosition = mFirstPosition; |
| 1204 | final RecycleBin recycleBin = mRecycler; |
| 1205 | |
| 1206 | if (dataChanged) { |
| 1207 | for (int i = 0; i < childCount; i++) { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1208 | recycleBin.addScrapView(getChildAt(i), firstPosition+i); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1209 | } |
| 1210 | } else { |
| 1211 | recycleBin.fillActiveViews(childCount, firstPosition); |
| 1212 | } |
| 1213 | |
| 1214 | // Clear out old views |
| 1215 | //removeAllViewsInLayout(); |
| 1216 | detachAllViewsFromParent(); |
Adam Powell | 539ee87 | 2012-02-03 19:00:49 -0800 | [diff] [blame] | 1217 | recycleBin.removeSkippedScrap(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1218 | |
| 1219 | switch (mLayoutMode) { |
| 1220 | case LAYOUT_SET_SELECTION: |
| 1221 | if (newSel != null) { |
| 1222 | sel = fillFromSelection(newSel.getTop(), childrenTop, childrenBottom); |
| 1223 | } else { |
| 1224 | sel = fillSelection(childrenTop, childrenBottom); |
| 1225 | } |
| 1226 | break; |
| 1227 | case LAYOUT_FORCE_TOP: |
| 1228 | mFirstPosition = 0; |
| 1229 | sel = fillFromTop(childrenTop); |
| 1230 | adjustViewsUpOrDown(); |
| 1231 | break; |
| 1232 | case LAYOUT_FORCE_BOTTOM: |
| 1233 | sel = fillUp(mItemCount - 1, childrenBottom); |
| 1234 | adjustViewsUpOrDown(); |
| 1235 | break; |
| 1236 | case LAYOUT_SPECIFIC: |
| 1237 | sel = fillSpecific(mSelectedPosition, mSpecificTop); |
| 1238 | break; |
| 1239 | case LAYOUT_SYNC: |
| 1240 | sel = fillSpecific(mSyncPosition, mSpecificTop); |
| 1241 | break; |
| 1242 | case LAYOUT_MOVE_SELECTION: |
| 1243 | // Move the selection relative to its old position |
| 1244 | sel = moveSelection(delta, childrenTop, childrenBottom); |
| 1245 | break; |
| 1246 | default: |
| 1247 | if (childCount == 0) { |
| 1248 | if (!mStackFromBottom) { |
Romain Guy | 91c8613 | 2010-03-26 17:29:45 -0700 | [diff] [blame] | 1249 | setSelectedPositionInt(mAdapter == null || isInTouchMode() ? |
| 1250 | INVALID_POSITION : 0); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1251 | sel = fillFromTop(childrenTop); |
| 1252 | } else { |
| 1253 | final int last = mItemCount - 1; |
Romain Guy | 91c8613 | 2010-03-26 17:29:45 -0700 | [diff] [blame] | 1254 | setSelectedPositionInt(mAdapter == null || isInTouchMode() ? |
| 1255 | INVALID_POSITION : last); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1256 | sel = fillFromBottom(last, childrenBottom); |
| 1257 | } |
| 1258 | } else { |
| 1259 | if (mSelectedPosition >= 0 && mSelectedPosition < mItemCount) { |
| 1260 | sel = fillSpecific(mSelectedPosition, oldSel == null ? |
| 1261 | childrenTop : oldSel.getTop()); |
| 1262 | } else if (mFirstPosition < mItemCount) { |
| 1263 | sel = fillSpecific(mFirstPosition, oldFirst == null ? |
| 1264 | childrenTop : oldFirst.getTop()); |
| 1265 | } else { |
| 1266 | sel = fillSpecific(0, childrenTop); |
| 1267 | } |
| 1268 | } |
| 1269 | break; |
| 1270 | } |
| 1271 | |
| 1272 | // Flush any cached views that did not get reused above |
| 1273 | recycleBin.scrapActiveViews(); |
| 1274 | |
| 1275 | if (sel != null) { |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1276 | positionSelector(INVALID_POSITION, sel); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1277 | mSelectedTop = sel.getTop(); |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1278 | } else if (mTouchMode > TOUCH_MODE_DOWN && mTouchMode < TOUCH_MODE_SCROLL) { |
| 1279 | View child = getChildAt(mMotionPosition - mFirstPosition); |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1280 | if (child != null) positionSelector(mMotionPosition, child); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1281 | } else { |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1282 | mSelectedTop = 0; |
| 1283 | mSelectorRect.setEmpty(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1284 | } |
| 1285 | |
| 1286 | mLayoutMode = LAYOUT_NORMAL; |
| 1287 | mDataChanged = false; |
Adam Powell | 161abf3 | 2012-05-23 17:22:49 -0700 | [diff] [blame] | 1288 | if (mPositionScrollAfterLayout != null) { |
| 1289 | post(mPositionScrollAfterLayout); |
| 1290 | mPositionScrollAfterLayout = null; |
| 1291 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1292 | mNeedSync = false; |
| 1293 | setNextSelectedPositionInt(mSelectedPosition); |
| 1294 | |
| 1295 | updateScrollIndicators(); |
| 1296 | |
| 1297 | if (mItemCount > 0) { |
| 1298 | checkSelectionChanged(); |
| 1299 | } |
| 1300 | |
| 1301 | invokeOnItemScrollListener(); |
| 1302 | } finally { |
| 1303 | if (!blockLayoutRequests) { |
| 1304 | mBlockLayoutRequests = false; |
| 1305 | } |
| 1306 | } |
| 1307 | } |
| 1308 | |
| 1309 | |
| 1310 | /** |
| 1311 | * Obtain the view and add it to our list of children. The view can be made |
| 1312 | * fresh, converted from an unused view, or used as is if it was in the |
| 1313 | * recycle bin. |
| 1314 | * |
| 1315 | * @param position Logical position in the list |
| 1316 | * @param y Top or bottom edge of the view to add |
| 1317 | * @param flow if true, align top edge to y. If false, align bottom edge to |
| 1318 | * y. |
| 1319 | * @param childrenLeft Left edge where children should be positioned |
| 1320 | * @param selected Is this position selected? |
| 1321 | * @param where to add new item in the list |
| 1322 | * @return View that was added |
| 1323 | */ |
| 1324 | private View makeAndAddView(int position, int y, boolean flow, int childrenLeft, |
| 1325 | boolean selected, int where) { |
| 1326 | View child; |
| 1327 | |
| 1328 | if (!mDataChanged) { |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1329 | // Try to use an existing view for this position |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1330 | child = mRecycler.getActiveView(position); |
| 1331 | if (child != null) { |
| 1332 | // Found it -- we're using an existing child |
| 1333 | // This just needs to be positioned |
| 1334 | setupChild(child, position, y, flow, childrenLeft, selected, true, where); |
| 1335 | return child; |
| 1336 | } |
| 1337 | } |
| 1338 | |
| 1339 | // Make a new view for this position, or convert an unused view if |
| 1340 | // possible |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1341 | child = obtainView(position, mIsScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1342 | |
| 1343 | // This needs to be positioned and measured |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1344 | setupChild(child, position, y, flow, childrenLeft, selected, mIsScrap[0], where); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1345 | |
| 1346 | return child; |
| 1347 | } |
| 1348 | |
| 1349 | /** |
| 1350 | * Add a view as a child and make sure it is measured (if necessary) and |
| 1351 | * positioned properly. |
| 1352 | * |
| 1353 | * @param child The view to add |
| 1354 | * @param position The position of the view |
| 1355 | * @param y The y position relative to which this view will be positioned |
| 1356 | * @param flow if true, align top edge to y. If false, align bottom edge |
| 1357 | * to y. |
| 1358 | * @param childrenLeft Left edge where children should be positioned |
| 1359 | * @param selected Is this position selected? |
| 1360 | * @param recycled Has this view been pulled from the recycle bin? If so it |
| 1361 | * does not need to be remeasured. |
| 1362 | * @param where Where to add the item in the list |
| 1363 | * |
| 1364 | */ |
| 1365 | private void setupChild(View child, int position, int y, boolean flow, int childrenLeft, |
| 1366 | boolean selected, boolean recycled, int where) { |
| 1367 | boolean isSelected = selected && shouldShowSelector(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1368 | final boolean updateChildSelected = isSelected != child.isSelected(); |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1369 | final int mode = mTouchMode; |
| 1370 | final boolean isPressed = mode > TOUCH_MODE_DOWN && mode < TOUCH_MODE_SCROLL && |
| 1371 | mMotionPosition == position; |
| 1372 | final boolean updateChildPressed = isPressed != child.isPressed(); |
| 1373 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1374 | boolean needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested(); |
| 1375 | |
| 1376 | // Respect layout params that are already in the view. Otherwise make |
| 1377 | // some up... |
Adam Powell | aebd28f | 2012-02-22 10:31:16 -0800 | [diff] [blame] | 1378 | AbsListView.LayoutParams p = (AbsListView.LayoutParams) child.getLayoutParams(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1379 | if (p == null) { |
Adam Powell | aebd28f | 2012-02-22 10:31:16 -0800 | [diff] [blame] | 1380 | p = (AbsListView.LayoutParams) generateDefaultLayoutParams(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1381 | } |
| 1382 | p.viewType = mAdapter.getItemViewType(position); |
| 1383 | |
Romain Guy | 0bf8859 | 2010-03-02 13:38:44 -0800 | [diff] [blame] | 1384 | if (recycled && !p.forceAdd) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1385 | attachViewToParent(child, where, p); |
| 1386 | } else { |
Romain Guy | 0bf8859 | 2010-03-02 13:38:44 -0800 | [diff] [blame] | 1387 | p.forceAdd = false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1388 | addViewInLayout(child, where, p, true); |
| 1389 | } |
| 1390 | |
| 1391 | if (updateChildSelected) { |
| 1392 | child.setSelected(isSelected); |
| 1393 | if (isSelected) { |
| 1394 | requestFocus(); |
| 1395 | } |
| 1396 | } |
| 1397 | |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1398 | if (updateChildPressed) { |
| 1399 | child.setPressed(isPressed); |
| 1400 | } |
| 1401 | |
Adam Powell | f343e1b | 2010-08-13 18:27:04 -0700 | [diff] [blame] | 1402 | if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) { |
| 1403 | if (child instanceof Checkable) { |
| 1404 | ((Checkable) child).setChecked(mCheckStates.get(position)); |
Dianne Hackborn | d0fa371 | 2010-09-14 18:57:14 -0700 | [diff] [blame] | 1405 | } else if (getContext().getApplicationInfo().targetSdkVersion |
| 1406 | >= android.os.Build.VERSION_CODES.HONEYCOMB) { |
| 1407 | child.setActivated(mCheckStates.get(position)); |
Adam Powell | f343e1b | 2010-08-13 18:27:04 -0700 | [diff] [blame] | 1408 | } |
| 1409 | } |
| 1410 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1411 | if (needToMeasure) { |
| 1412 | int childHeightSpec = ViewGroup.getChildMeasureSpec( |
| 1413 | MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 0, p.height); |
| 1414 | |
| 1415 | int childWidthSpec = ViewGroup.getChildMeasureSpec( |
| 1416 | MeasureSpec.makeMeasureSpec(mColumnWidth, MeasureSpec.EXACTLY), 0, p.width); |
| 1417 | child.measure(childWidthSpec, childHeightSpec); |
| 1418 | } else { |
| 1419 | cleanupLayoutState(child); |
| 1420 | } |
| 1421 | |
| 1422 | final int w = child.getMeasuredWidth(); |
| 1423 | final int h = child.getMeasuredHeight(); |
| 1424 | |
| 1425 | int childLeft; |
| 1426 | final int childTop = flow ? y : y - h; |
| 1427 | |
Fabrice Di Meglio | e56ffdc | 2012-09-23 14:51:16 -0700 | [diff] [blame] | 1428 | final int layoutDirection = getLayoutDirection(); |
Fabrice Di Meglio | c005322 | 2011-06-13 12:16:51 -0700 | [diff] [blame] | 1429 | final int absoluteGravity = Gravity.getAbsoluteGravity(mGravity, layoutDirection); |
Fabrice Di Meglio | 6a03640 | 2011-05-23 14:43:23 -0700 | [diff] [blame] | 1430 | switch (absoluteGravity & Gravity.HORIZONTAL_GRAVITY_MASK) { |
| 1431 | case Gravity.LEFT: |
| 1432 | childLeft = childrenLeft; |
| 1433 | break; |
| 1434 | case Gravity.CENTER_HORIZONTAL: |
| 1435 | childLeft = childrenLeft + ((mColumnWidth - w) / 2); |
| 1436 | break; |
| 1437 | case Gravity.RIGHT: |
| 1438 | childLeft = childrenLeft + mColumnWidth - w; |
| 1439 | break; |
| 1440 | default: |
| 1441 | childLeft = childrenLeft; |
| 1442 | break; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1443 | } |
| 1444 | |
| 1445 | if (needToMeasure) { |
| 1446 | final int childRight = childLeft + w; |
| 1447 | final int childBottom = childTop + h; |
| 1448 | child.layout(childLeft, childTop, childRight, childBottom); |
| 1449 | } else { |
| 1450 | child.offsetLeftAndRight(childLeft - child.getLeft()); |
| 1451 | child.offsetTopAndBottom(childTop - child.getTop()); |
| 1452 | } |
| 1453 | |
| 1454 | if (mCachingStarted) { |
| 1455 | child.setDrawingCacheEnabled(true); |
| 1456 | } |
Dianne Hackborn | 079e235 | 2010-10-18 17:02:43 -0700 | [diff] [blame] | 1457 | |
| 1458 | if (recycled && (((AbsListView.LayoutParams)child.getLayoutParams()).scrappedFromPosition) |
| 1459 | != position) { |
| 1460 | child.jumpDrawablesToCurrentState(); |
| 1461 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1462 | } |
| 1463 | |
| 1464 | /** |
| 1465 | * Sets the currently selected item |
| 1466 | * |
| 1467 | * @param position Index (starting at 0) of the data item to be selected. |
| 1468 | * |
| 1469 | * If in touch mode, the item will not be selected but it will still be positioned |
| 1470 | * appropriately. |
| 1471 | */ |
| 1472 | @Override |
| 1473 | public void setSelection(int position) { |
| 1474 | if (!isInTouchMode()) { |
| 1475 | setNextSelectedPositionInt(position); |
| 1476 | } else { |
| 1477 | mResurrectToPosition = position; |
| 1478 | } |
| 1479 | mLayoutMode = LAYOUT_SET_SELECTION; |
Adam Powell | 1fa179ef | 2012-04-12 15:01:40 -0700 | [diff] [blame] | 1480 | if (mPositionScroller != null) { |
| 1481 | mPositionScroller.stop(); |
| 1482 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1483 | requestLayout(); |
| 1484 | } |
| 1485 | |
| 1486 | /** |
| 1487 | * Makes the item at the supplied position selected. |
| 1488 | * |
| 1489 | * @param position the position of the new selection |
| 1490 | */ |
| 1491 | @Override |
| 1492 | void setSelectionInt(int position) { |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1493 | int previousSelectedPosition = mNextSelectedPosition; |
| 1494 | |
Adam Powell | 1fa179ef | 2012-04-12 15:01:40 -0700 | [diff] [blame] | 1495 | if (mPositionScroller != null) { |
| 1496 | mPositionScroller.stop(); |
| 1497 | } |
| 1498 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1499 | setNextSelectedPositionInt(position); |
| 1500 | layoutChildren(); |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1501 | |
| 1502 | final int next = mStackFromBottom ? mItemCount - 1 - mNextSelectedPosition : |
| 1503 | mNextSelectedPosition; |
| 1504 | final int previous = mStackFromBottom ? mItemCount - 1 |
| 1505 | - previousSelectedPosition : previousSelectedPosition; |
| 1506 | |
| 1507 | final int nextRow = next / mNumColumns; |
| 1508 | final int previousRow = previous / mNumColumns; |
| 1509 | |
| 1510 | if (nextRow != previousRow) { |
| 1511 | awakenScrollBars(); |
| 1512 | } |
| 1513 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1514 | } |
| 1515 | |
| 1516 | @Override |
| 1517 | public boolean onKeyDown(int keyCode, KeyEvent event) { |
| 1518 | return commonKey(keyCode, 1, event); |
| 1519 | } |
| 1520 | |
| 1521 | @Override |
| 1522 | public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { |
| 1523 | return commonKey(keyCode, repeatCount, event); |
| 1524 | } |
| 1525 | |
| 1526 | @Override |
| 1527 | public boolean onKeyUp(int keyCode, KeyEvent event) { |
| 1528 | return commonKey(keyCode, 1, event); |
| 1529 | } |
| 1530 | |
| 1531 | private boolean commonKey(int keyCode, int count, KeyEvent event) { |
| 1532 | if (mAdapter == null) { |
| 1533 | return false; |
| 1534 | } |
| 1535 | |
| 1536 | if (mDataChanged) { |
| 1537 | layoutChildren(); |
| 1538 | } |
| 1539 | |
| 1540 | boolean handled = false; |
| 1541 | int action = event.getAction(); |
| 1542 | |
| 1543 | if (action != KeyEvent.ACTION_UP) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1544 | switch (keyCode) { |
| 1545 | case KeyEvent.KEYCODE_DPAD_LEFT: |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1546 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1547 | handled = resurrectSelectionIfNeeded() || arrowScroll(FOCUS_LEFT); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1548 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1549 | break; |
| 1550 | |
| 1551 | case KeyEvent.KEYCODE_DPAD_RIGHT: |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1552 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1553 | handled = resurrectSelectionIfNeeded() || arrowScroll(FOCUS_RIGHT); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1554 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1555 | break; |
| 1556 | |
| 1557 | case KeyEvent.KEYCODE_DPAD_UP: |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1558 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1559 | handled = resurrectSelectionIfNeeded() || arrowScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1560 | } else if (event.hasModifiers(KeyEvent.META_ALT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1561 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1562 | } |
| 1563 | break; |
| 1564 | |
| 1565 | case KeyEvent.KEYCODE_DPAD_DOWN: |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1566 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1567 | handled = resurrectSelectionIfNeeded() || arrowScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1568 | } else if (event.hasModifiers(KeyEvent.META_ALT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1569 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1570 | } |
| 1571 | break; |
| 1572 | |
| 1573 | case KeyEvent.KEYCODE_DPAD_CENTER: |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1574 | case KeyEvent.KEYCODE_ENTER: |
| 1575 | if (event.hasNoModifiers()) { |
| 1576 | handled = resurrectSelectionIfNeeded(); |
| 1577 | if (!handled |
| 1578 | && event.getRepeatCount() == 0 && getChildCount() > 0) { |
| 1579 | keyPressed(); |
| 1580 | handled = true; |
| 1581 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1582 | } |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1583 | break; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1584 | |
| 1585 | case KeyEvent.KEYCODE_SPACE: |
| 1586 | if (mPopup == null || !mPopup.isShowing()) { |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1587 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1588 | handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1589 | } else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1590 | handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1591 | } |
| 1592 | } |
| 1593 | break; |
| 1594 | |
| 1595 | case KeyEvent.KEYCODE_PAGE_UP: |
| 1596 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1597 | handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1598 | } else if (event.hasModifiers(KeyEvent.META_ALT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1599 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1600 | } |
| 1601 | break; |
| 1602 | |
| 1603 | case KeyEvent.KEYCODE_PAGE_DOWN: |
| 1604 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1605 | handled = resurrectSelectionIfNeeded() || pageScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1606 | } else if (event.hasModifiers(KeyEvent.META_ALT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1607 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1608 | } |
| 1609 | break; |
| 1610 | |
| 1611 | case KeyEvent.KEYCODE_MOVE_HOME: |
| 1612 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1613 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_UP); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1614 | } |
| 1615 | break; |
| 1616 | |
| 1617 | case KeyEvent.KEYCODE_MOVE_END: |
| 1618 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1619 | handled = resurrectSelectionIfNeeded() || fullScroll(FOCUS_DOWN); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1620 | } |
| 1621 | break; |
| 1622 | |
| 1623 | case KeyEvent.KEYCODE_TAB: |
| 1624 | // XXX Sometimes it is useful to be able to TAB through the items in |
| 1625 | // a GridView sequentially. Unfortunately this can create an |
| 1626 | // asymmetry in TAB navigation order unless the list selection |
| 1627 | // always reverts to the top or bottom when receiving TAB focus from |
| 1628 | // another widget. Leaving this behavior disabled for now but |
| 1629 | // perhaps it should be configurable (and more comprehensive). |
| 1630 | if (false) { |
| 1631 | if (event.hasNoModifiers()) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1632 | handled = resurrectSelectionIfNeeded() |
| 1633 | || sequenceScroll(FOCUS_FORWARD); |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1634 | } else if (event.hasModifiers(KeyEvent.META_SHIFT_ON)) { |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1635 | handled = resurrectSelectionIfNeeded() |
| 1636 | || sequenceScroll(FOCUS_BACKWARD); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1637 | } |
| 1638 | } |
| 1639 | break; |
| 1640 | } |
| 1641 | } |
| 1642 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1643 | if (handled) { |
| 1644 | return true; |
Jeff Brown | 8d6d3b8 | 2011-01-26 19:31:18 -0800 | [diff] [blame] | 1645 | } |
| 1646 | |
| 1647 | if (sendToTextFilter(keyCode, count, event)) { |
| 1648 | return true; |
| 1649 | } |
| 1650 | |
| 1651 | switch (action) { |
| 1652 | case KeyEvent.ACTION_DOWN: |
| 1653 | return super.onKeyDown(keyCode, event); |
| 1654 | case KeyEvent.ACTION_UP: |
| 1655 | return super.onKeyUp(keyCode, event); |
| 1656 | case KeyEvent.ACTION_MULTIPLE: |
| 1657 | return super.onKeyMultiple(keyCode, count, event); |
| 1658 | default: |
| 1659 | return false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1660 | } |
| 1661 | } |
| 1662 | |
| 1663 | /** |
| 1664 | * Scrolls up or down by the number of items currently present on screen. |
| 1665 | * |
| 1666 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 1667 | * @return whether selection was moved |
| 1668 | */ |
| 1669 | boolean pageScroll(int direction) { |
| 1670 | int nextPage = -1; |
| 1671 | |
| 1672 | if (direction == FOCUS_UP) { |
Romain Guy | 64d50a6 | 2010-08-20 10:50:49 -0700 | [diff] [blame] | 1673 | nextPage = Math.max(0, mSelectedPosition - getChildCount()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1674 | } else if (direction == FOCUS_DOWN) { |
Romain Guy | 64d50a6 | 2010-08-20 10:50:49 -0700 | [diff] [blame] | 1675 | nextPage = Math.min(mItemCount - 1, mSelectedPosition + getChildCount()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1676 | } |
| 1677 | |
| 1678 | if (nextPage >= 0) { |
| 1679 | setSelectionInt(nextPage); |
| 1680 | invokeOnItemScrollListener(); |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1681 | awakenScrollBars(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1682 | return true; |
| 1683 | } |
| 1684 | |
| 1685 | return false; |
| 1686 | } |
| 1687 | |
| 1688 | /** |
| 1689 | * Go to the last or first item if possible. |
| 1690 | * |
| 1691 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN}. |
| 1692 | * |
| 1693 | * @return Whether selection was moved. |
| 1694 | */ |
| 1695 | boolean fullScroll(int direction) { |
| 1696 | boolean moved = false; |
| 1697 | if (direction == FOCUS_UP) { |
| 1698 | mLayoutMode = LAYOUT_SET_SELECTION; |
| 1699 | setSelectionInt(0); |
| 1700 | invokeOnItemScrollListener(); |
| 1701 | moved = true; |
| 1702 | } else if (direction == FOCUS_DOWN) { |
| 1703 | mLayoutMode = LAYOUT_SET_SELECTION; |
| 1704 | setSelectionInt(mItemCount - 1); |
| 1705 | invokeOnItemScrollListener(); |
| 1706 | moved = true; |
| 1707 | } |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1708 | |
| 1709 | if (moved) { |
| 1710 | awakenScrollBars(); |
| 1711 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1712 | |
| 1713 | return moved; |
| 1714 | } |
| 1715 | |
| 1716 | /** |
| 1717 | * Scrolls to the next or previous item, horizontally or vertically. |
| 1718 | * |
| 1719 | * @param direction either {@link View#FOCUS_LEFT}, {@link View#FOCUS_RIGHT}, |
| 1720 | * {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 1721 | * |
| 1722 | * @return whether selection was moved |
| 1723 | */ |
| 1724 | boolean arrowScroll(int direction) { |
| 1725 | final int selectedPosition = mSelectedPosition; |
| 1726 | final int numColumns = mNumColumns; |
| 1727 | |
| 1728 | int startOfRowPos; |
| 1729 | int endOfRowPos; |
| 1730 | |
| 1731 | boolean moved = false; |
| 1732 | |
| 1733 | if (!mStackFromBottom) { |
| 1734 | startOfRowPos = (selectedPosition / numColumns) * numColumns; |
| 1735 | endOfRowPos = Math.min(startOfRowPos + numColumns - 1, mItemCount - 1); |
| 1736 | } else { |
| 1737 | final int invertedSelection = mItemCount - 1 - selectedPosition; |
| 1738 | endOfRowPos = mItemCount - 1 - (invertedSelection / numColumns) * numColumns; |
| 1739 | startOfRowPos = Math.max(0, endOfRowPos - numColumns + 1); |
| 1740 | } |
| 1741 | |
| 1742 | switch (direction) { |
| 1743 | case FOCUS_UP: |
| 1744 | if (startOfRowPos > 0) { |
| 1745 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
| 1746 | setSelectionInt(Math.max(0, selectedPosition - numColumns)); |
| 1747 | moved = true; |
| 1748 | } |
| 1749 | break; |
| 1750 | case FOCUS_DOWN: |
| 1751 | if (endOfRowPos < mItemCount - 1) { |
| 1752 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
| 1753 | setSelectionInt(Math.min(selectedPosition + numColumns, mItemCount - 1)); |
| 1754 | moved = true; |
| 1755 | } |
| 1756 | break; |
| 1757 | case FOCUS_LEFT: |
| 1758 | if (selectedPosition > startOfRowPos) { |
| 1759 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
Romain Guy | 51d154b | 2009-05-04 16:24:39 -0700 | [diff] [blame] | 1760 | setSelectionInt(Math.max(0, selectedPosition - 1)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1761 | moved = true; |
| 1762 | } |
| 1763 | break; |
| 1764 | case FOCUS_RIGHT: |
| 1765 | if (selectedPosition < endOfRowPos) { |
| 1766 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
Romain Guy | 51d154b | 2009-05-04 16:24:39 -0700 | [diff] [blame] | 1767 | setSelectionInt(Math.min(selectedPosition + 1, mItemCount - 1)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1768 | moved = true; |
| 1769 | } |
| 1770 | break; |
| 1771 | } |
| 1772 | |
| 1773 | if (moved) { |
| 1774 | playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction)); |
| 1775 | invokeOnItemScrollListener(); |
| 1776 | } |
| 1777 | |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1778 | if (moved) { |
| 1779 | awakenScrollBars(); |
| 1780 | } |
| 1781 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1782 | return moved; |
| 1783 | } |
| 1784 | |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1785 | /** |
| 1786 | * Goes to the next or previous item according to the order set by the |
| 1787 | * adapter. |
| 1788 | */ |
| 1789 | boolean sequenceScroll(int direction) { |
| 1790 | int selectedPosition = mSelectedPosition; |
| 1791 | int numColumns = mNumColumns; |
| 1792 | int count = mItemCount; |
| 1793 | |
| 1794 | int startOfRow; |
| 1795 | int endOfRow; |
| 1796 | if (!mStackFromBottom) { |
| 1797 | startOfRow = (selectedPosition / numColumns) * numColumns; |
| 1798 | endOfRow = Math.min(startOfRow + numColumns - 1, count - 1); |
| 1799 | } else { |
| 1800 | int invertedSelection = count - 1 - selectedPosition; |
| 1801 | endOfRow = count - 1 - (invertedSelection / numColumns) * numColumns; |
| 1802 | startOfRow = Math.max(0, endOfRow - numColumns + 1); |
| 1803 | } |
| 1804 | |
| 1805 | boolean moved = false; |
| 1806 | boolean showScroll = false; |
| 1807 | switch (direction) { |
| 1808 | case FOCUS_FORWARD: |
| 1809 | if (selectedPosition < count - 1) { |
| 1810 | // Move to the next item. |
| 1811 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
| 1812 | setSelectionInt(selectedPosition + 1); |
| 1813 | moved = true; |
| 1814 | // Show the scrollbar only if changing rows. |
| 1815 | showScroll = selectedPosition == endOfRow; |
| 1816 | } |
| 1817 | break; |
| 1818 | |
| 1819 | case FOCUS_BACKWARD: |
| 1820 | if (selectedPosition > 0) { |
| 1821 | // Move to the previous item. |
| 1822 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
| 1823 | setSelectionInt(selectedPosition - 1); |
| 1824 | moved = true; |
| 1825 | // Show the scrollbar only if changing rows. |
| 1826 | showScroll = selectedPosition == startOfRow; |
| 1827 | } |
| 1828 | break; |
| 1829 | } |
| 1830 | |
| 1831 | if (moved) { |
| 1832 | playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction)); |
| 1833 | invokeOnItemScrollListener(); |
| 1834 | } |
| 1835 | |
| 1836 | if (showScroll) { |
| 1837 | awakenScrollBars(); |
| 1838 | } |
| 1839 | |
| 1840 | return moved; |
| 1841 | } |
| 1842 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1843 | @Override |
| 1844 | protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { |
| 1845 | super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); |
| 1846 | |
| 1847 | int closestChildIndex = -1; |
| 1848 | if (gainFocus && previouslyFocusedRect != null) { |
| 1849 | previouslyFocusedRect.offset(mScrollX, mScrollY); |
| 1850 | |
| 1851 | // figure out which item should be selected based on previously |
| 1852 | // focused rect |
| 1853 | Rect otherRect = mTempRect; |
| 1854 | int minDistance = Integer.MAX_VALUE; |
| 1855 | final int childCount = getChildCount(); |
| 1856 | for (int i = 0; i < childCount; i++) { |
| 1857 | // only consider view's on appropriate edge of grid |
| 1858 | if (!isCandidateSelection(i, direction)) { |
| 1859 | continue; |
| 1860 | } |
| 1861 | |
| 1862 | final View other = getChildAt(i); |
| 1863 | other.getDrawingRect(otherRect); |
| 1864 | offsetDescendantRectToMyCoords(other, otherRect); |
| 1865 | int distance = getDistance(previouslyFocusedRect, otherRect, direction); |
| 1866 | |
| 1867 | if (distance < minDistance) { |
| 1868 | minDistance = distance; |
| 1869 | closestChildIndex = i; |
| 1870 | } |
| 1871 | } |
| 1872 | } |
| 1873 | |
| 1874 | if (closestChildIndex >= 0) { |
| 1875 | setSelection(closestChildIndex + mFirstPosition); |
| 1876 | } else { |
| 1877 | requestLayout(); |
| 1878 | } |
| 1879 | } |
| 1880 | |
| 1881 | /** |
| 1882 | * Is childIndex a candidate for next focus given the direction the focus |
| 1883 | * change is coming from? |
| 1884 | * @param childIndex The index to check. |
| 1885 | * @param direction The direction, one of |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1886 | * {FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, FOCUS_BACKWARD} |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1887 | * @return Whether childIndex is a candidate. |
| 1888 | */ |
| 1889 | private boolean isCandidateSelection(int childIndex, int direction) { |
| 1890 | final int count = getChildCount(); |
| 1891 | final int invertedIndex = count - 1 - childIndex; |
| 1892 | |
| 1893 | int rowStart; |
| 1894 | int rowEnd; |
| 1895 | |
| 1896 | if (!mStackFromBottom) { |
| 1897 | rowStart = childIndex - (childIndex % mNumColumns); |
| 1898 | rowEnd = Math.max(rowStart + mNumColumns - 1, count); |
| 1899 | } else { |
| 1900 | rowEnd = count - 1 - (invertedIndex - (invertedIndex % mNumColumns)); |
| 1901 | rowStart = Math.max(0, rowEnd - mNumColumns + 1); |
| 1902 | } |
| 1903 | |
| 1904 | switch (direction) { |
| 1905 | case View.FOCUS_RIGHT: |
| 1906 | // coming from left, selection is only valid if it is on left |
| 1907 | // edge |
| 1908 | return childIndex == rowStart; |
| 1909 | case View.FOCUS_DOWN: |
| 1910 | // coming from top; only valid if in top row |
| 1911 | return rowStart == 0; |
| 1912 | case View.FOCUS_LEFT: |
| 1913 | // coming from right, must be on right edge |
| 1914 | return childIndex == rowEnd; |
| 1915 | case View.FOCUS_UP: |
| 1916 | // coming from bottom, need to be in last row |
| 1917 | return rowEnd == count - 1; |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1918 | case View.FOCUS_FORWARD: |
| 1919 | // coming from top-left, need to be first in top row |
| 1920 | return childIndex == rowStart && rowStart == 0; |
| 1921 | case View.FOCUS_BACKWARD: |
| 1922 | // coming from bottom-right, need to be last in bottom row |
| 1923 | return childIndex == rowEnd && rowEnd == count - 1; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1924 | default: |
| 1925 | throw new IllegalArgumentException("direction must be one of " |
Jeff Brown | 4e6319b | 2010-12-13 10:36:51 -0800 | [diff] [blame] | 1926 | + "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, " |
| 1927 | + "FOCUS_FORWARD, FOCUS_BACKWARD}."); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1928 | } |
| 1929 | } |
| 1930 | |
| 1931 | /** |
Adam Powell | 0b7413d | 2012-03-21 14:51:41 -0700 | [diff] [blame] | 1932 | * Set the gravity for this grid. Gravity describes how the child views |
| 1933 | * are horizontally aligned. Defaults to Gravity.LEFT |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1934 | * |
| 1935 | * @param gravity the gravity to apply to this grid's children |
| 1936 | * |
| 1937 | * @attr ref android.R.styleable#GridView_gravity |
| 1938 | */ |
| 1939 | public void setGravity(int gravity) { |
| 1940 | if (mGravity != gravity) { |
| 1941 | mGravity = gravity; |
| 1942 | requestLayoutIfNecessary(); |
| 1943 | } |
| 1944 | } |
| 1945 | |
| 1946 | /** |
Adam Powell | 0b7413d | 2012-03-21 14:51:41 -0700 | [diff] [blame] | 1947 | * Describes how the child views are horizontally aligned. Defaults to Gravity.LEFT |
| 1948 | * |
| 1949 | * @return the gravity that will be applied to this grid's children |
| 1950 | * |
| 1951 | * @attr ref android.R.styleable#GridView_gravity |
| 1952 | */ |
| 1953 | public int getGravity() { |
| 1954 | return mGravity; |
| 1955 | } |
| 1956 | |
| 1957 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1958 | * Set the amount of horizontal (x) spacing to place between each item |
| 1959 | * in the grid. |
| 1960 | * |
| 1961 | * @param horizontalSpacing The amount of horizontal space between items, |
| 1962 | * in pixels. |
| 1963 | * |
| 1964 | * @attr ref android.R.styleable#GridView_horizontalSpacing |
| 1965 | */ |
| 1966 | public void setHorizontalSpacing(int horizontalSpacing) { |
| 1967 | if (horizontalSpacing != mRequestedHorizontalSpacing) { |
| 1968 | mRequestedHorizontalSpacing = horizontalSpacing; |
| 1969 | requestLayoutIfNecessary(); |
| 1970 | } |
| 1971 | } |
| 1972 | |
Adam Powell | 0b7413d | 2012-03-21 14:51:41 -0700 | [diff] [blame] | 1973 | /** |
| 1974 | * Returns the amount of horizontal spacing currently used between each item in the grid. |
| 1975 | * |
| 1976 | * <p>This is only accurate for the current layout. If {@link #setHorizontalSpacing(int)} |
| 1977 | * has been called but layout is not yet complete, this method may return a stale value. |
| 1978 | * To get the horizontal spacing that was explicitly requested use |
| 1979 | * {@link #getRequestedHorizontalSpacing()}.</p> |
| 1980 | * |
| 1981 | * @return Current horizontal spacing between each item in pixels |
| 1982 | * |
| 1983 | * @see #setHorizontalSpacing(int) |
| 1984 | * @see #getRequestedHorizontalSpacing() |
| 1985 | * |
| 1986 | * @attr ref android.R.styleable#GridView_horizontalSpacing |
| 1987 | */ |
| 1988 | public int getHorizontalSpacing() { |
| 1989 | return mHorizontalSpacing; |
| 1990 | } |
| 1991 | |
| 1992 | /** |
| 1993 | * Returns the requested amount of horizontal spacing between each item in the grid. |
| 1994 | * |
| 1995 | * <p>The value returned may have been supplied during inflation as part of a style, |
| 1996 | * the default GridView style, or by a call to {@link #setHorizontalSpacing(int)}. |
| 1997 | * If layout is not yet complete or if GridView calculated a different horizontal spacing |
| 1998 | * from what was requested, this may return a different value from |
| 1999 | * {@link #getHorizontalSpacing()}.</p> |
| 2000 | * |
| 2001 | * @return The currently requested horizontal spacing between items, in pixels |
| 2002 | * |
| 2003 | * @see #setHorizontalSpacing(int) |
| 2004 | * @see #getHorizontalSpacing() |
| 2005 | * |
| 2006 | * @attr ref android.R.styleable#GridView_horizontalSpacing |
| 2007 | */ |
| 2008 | public int getRequestedHorizontalSpacing() { |
| 2009 | return mRequestedHorizontalSpacing; |
| 2010 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2011 | |
| 2012 | /** |
| 2013 | * Set the amount of vertical (y) spacing to place between each item |
| 2014 | * in the grid. |
| 2015 | * |
| 2016 | * @param verticalSpacing The amount of vertical space between items, |
| 2017 | * in pixels. |
| 2018 | * |
Adam Powell | 0b7413d | 2012-03-21 14:51:41 -0700 | [diff] [blame] | 2019 | * @see #getVerticalSpacing() |
| 2020 | * |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2021 | * @attr ref android.R.styleable#GridView_verticalSpacing |
| 2022 | */ |
| 2023 | public void setVerticalSpacing(int verticalSpacing) { |
| 2024 | if (verticalSpacing != mVerticalSpacing) { |
| 2025 | mVerticalSpacing = verticalSpacing; |
| 2026 | requestLayoutIfNecessary(); |
| 2027 | } |
| 2028 | } |
| 2029 | |
| 2030 | /** |
Adam Powell | 0b7413d | 2012-03-21 14:51:41 -0700 | [diff] [blame] | 2031 | * Returns the amount of vertical spacing between each item in the grid. |
| 2032 | * |
| 2033 | * @return The vertical spacing between items in pixels |
| 2034 | * |
| 2035 | * @see #setVerticalSpacing(int) |
| 2036 | * |
| 2037 | * @attr ref android.R.styleable#GridView_verticalSpacing |
| 2038 | */ |
| 2039 | public int getVerticalSpacing() { |
| 2040 | return mVerticalSpacing; |
| 2041 | } |
| 2042 | |
| 2043 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2044 | * Control how items are stretched to fill their space. |
| 2045 | * |
| 2046 | * @param stretchMode Either {@link #NO_STRETCH}, |
| 2047 | * {@link #STRETCH_SPACING}, {@link #STRETCH_SPACING_UNIFORM}, or {@link #STRETCH_COLUMN_WIDTH}. |
| 2048 | * |
| 2049 | * @attr ref android.R.styleable#GridView_stretchMode |
| 2050 | */ |
| 2051 | public void setStretchMode(int stretchMode) { |
| 2052 | if (stretchMode != mStretchMode) { |
| 2053 | mStretchMode = stretchMode; |
| 2054 | requestLayoutIfNecessary(); |
| 2055 | } |
| 2056 | } |
| 2057 | |
| 2058 | public int getStretchMode() { |
| 2059 | return mStretchMode; |
| 2060 | } |
| 2061 | |
| 2062 | /** |
| 2063 | * Set the width of columns in the grid. |
| 2064 | * |
| 2065 | * @param columnWidth The column width, in pixels. |
| 2066 | * |
| 2067 | * @attr ref android.R.styleable#GridView_columnWidth |
| 2068 | */ |
| 2069 | public void setColumnWidth(int columnWidth) { |
| 2070 | if (columnWidth != mRequestedColumnWidth) { |
| 2071 | mRequestedColumnWidth = columnWidth; |
| 2072 | requestLayoutIfNecessary(); |
| 2073 | } |
| 2074 | } |
| 2075 | |
| 2076 | /** |
Adam Powell | 0b7413d | 2012-03-21 14:51:41 -0700 | [diff] [blame] | 2077 | * Return the width of a column in the grid. |
| 2078 | * |
| 2079 | * <p>This may not be valid yet if a layout is pending.</p> |
| 2080 | * |
| 2081 | * @return The column width in pixels |
| 2082 | * |
| 2083 | * @see #setColumnWidth(int) |
| 2084 | * @see #getRequestedColumnWidth() |
| 2085 | * |
| 2086 | * @attr ref android.R.styleable#GridView_columnWidth |
| 2087 | */ |
| 2088 | public int getColumnWidth() { |
| 2089 | return mColumnWidth; |
| 2090 | } |
| 2091 | |
| 2092 | /** |
| 2093 | * Return the requested width of a column in the grid. |
| 2094 | * |
| 2095 | * <p>This may not be the actual column width used. Use {@link #getColumnWidth()} |
| 2096 | * to retrieve the current real width of a column.</p> |
| 2097 | * |
| 2098 | * @return The requested column width in pixels |
| 2099 | * |
| 2100 | * @see #setColumnWidth(int) |
| 2101 | * @see #getColumnWidth() |
| 2102 | * |
| 2103 | * @attr ref android.R.styleable#GridView_columnWidth |
| 2104 | */ |
| 2105 | public int getRequestedColumnWidth() { |
| 2106 | return mRequestedColumnWidth; |
| 2107 | } |
| 2108 | |
| 2109 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2110 | * Set the number of columns in the grid |
| 2111 | * |
| 2112 | * @param numColumns The desired number of columns. |
| 2113 | * |
| 2114 | * @attr ref android.R.styleable#GridView_numColumns |
| 2115 | */ |
| 2116 | public void setNumColumns(int numColumns) { |
| 2117 | if (numColumns != mRequestedNumColumns) { |
| 2118 | mRequestedNumColumns = numColumns; |
| 2119 | requestLayoutIfNecessary(); |
| 2120 | } |
| 2121 | } |
Andrew Sapperstein | 8d9db8e | 2010-05-13 17:01:03 -0700 | [diff] [blame] | 2122 | |
| 2123 | /** |
| 2124 | * Get the number of columns in the grid. |
| 2125 | * Returns {@link #AUTO_FIT} if the Grid has never been laid out. |
| 2126 | * |
| 2127 | * @attr ref android.R.styleable#GridView_numColumns |
| 2128 | * |
| 2129 | * @see #setNumColumns(int) |
| 2130 | */ |
| 2131 | @ViewDebug.ExportedProperty |
| 2132 | public int getNumColumns() { |
| 2133 | return mNumColumns; |
| 2134 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2135 | |
| 2136 | /** |
| 2137 | * Make sure views are touching the top or bottom edge, as appropriate for |
| 2138 | * our gravity |
| 2139 | */ |
| 2140 | private void adjustViewsUpOrDown() { |
| 2141 | final int childCount = getChildCount(); |
| 2142 | |
| 2143 | if (childCount > 0) { |
| 2144 | int delta; |
| 2145 | View child; |
| 2146 | |
| 2147 | if (!mStackFromBottom) { |
| 2148 | // Uh-oh -- we came up short. Slide all views up to make them |
| 2149 | // align with the top |
| 2150 | child = getChildAt(0); |
| 2151 | delta = child.getTop() - mListPadding.top; |
| 2152 | if (mFirstPosition != 0) { |
| 2153 | // It's OK to have some space above the first item if it is |
| 2154 | // part of the vertical spacing |
| 2155 | delta -= mVerticalSpacing; |
| 2156 | } |
| 2157 | if (delta < 0) { |
| 2158 | // We only are looking to see if we are too low, not too high |
| 2159 | delta = 0; |
| 2160 | } |
| 2161 | } else { |
| 2162 | // we are too high, slide all views down to align with bottom |
| 2163 | child = getChildAt(childCount - 1); |
| 2164 | delta = child.getBottom() - (getHeight() - mListPadding.bottom); |
| 2165 | |
| 2166 | if (mFirstPosition + childCount < mItemCount) { |
| 2167 | // It's OK to have some space below the last item if it is |
| 2168 | // part of the vertical spacing |
| 2169 | delta += mVerticalSpacing; |
| 2170 | } |
| 2171 | |
| 2172 | if (delta > 0) { |
| 2173 | // We only are looking to see if we are too high, not too low |
| 2174 | delta = 0; |
| 2175 | } |
| 2176 | } |
| 2177 | |
| 2178 | if (delta != 0) { |
| 2179 | offsetChildrenTopAndBottom(-delta); |
| 2180 | } |
| 2181 | } |
| 2182 | } |
| 2183 | |
| 2184 | @Override |
| 2185 | protected int computeVerticalScrollExtent() { |
| 2186 | final int count = getChildCount(); |
| 2187 | if (count > 0) { |
| 2188 | final int numColumns = mNumColumns; |
| 2189 | final int rowCount = (count + numColumns - 1) / numColumns; |
| 2190 | |
| 2191 | int extent = rowCount * 100; |
| 2192 | |
| 2193 | View view = getChildAt(0); |
| 2194 | final int top = view.getTop(); |
| 2195 | int height = view.getHeight(); |
| 2196 | if (height > 0) { |
| 2197 | extent += (top * 100) / height; |
| 2198 | } |
| 2199 | |
| 2200 | view = getChildAt(count - 1); |
| 2201 | final int bottom = view.getBottom(); |
| 2202 | height = view.getHeight(); |
| 2203 | if (height > 0) { |
| 2204 | extent -= ((bottom - getHeight()) * 100) / height; |
| 2205 | } |
| 2206 | |
| 2207 | return extent; |
| 2208 | } |
| 2209 | return 0; |
| 2210 | } |
| 2211 | |
| 2212 | @Override |
| 2213 | protected int computeVerticalScrollOffset() { |
| 2214 | if (mFirstPosition >= 0 && getChildCount() > 0) { |
| 2215 | final View view = getChildAt(0); |
| 2216 | final int top = view.getTop(); |
| 2217 | int height = view.getHeight(); |
| 2218 | if (height > 0) { |
Adam Powell | f2a204e | 2010-02-12 15:25:33 -0800 | [diff] [blame] | 2219 | final int numColumns = mNumColumns; |
Adam Powell | f2a204e | 2010-02-12 15:25:33 -0800 | [diff] [blame] | 2220 | final int rowCount = (mItemCount + numColumns - 1) / numColumns; |
Pieter-Jan Vandormael | bbf7b4c | 2012-06-16 17:11:54 +0200 | [diff] [blame] | 2221 | // In case of stackFromBottom the calculation of whichRow needs |
| 2222 | // to take into account that counting from the top the first row |
| 2223 | // might not be entirely filled. |
| 2224 | final int oddItemsOnFirstRow = isStackFromBottom() ? ((rowCount * numColumns) - |
| 2225 | mItemCount) : 0; |
| 2226 | final int whichRow = (mFirstPosition + oddItemsOnFirstRow) / numColumns; |
Adam Powell | f2a204e | 2010-02-12 15:25:33 -0800 | [diff] [blame] | 2227 | return Math.max(whichRow * 100 - (top * 100) / height + |
| 2228 | (int) ((float) mScrollY / getHeight() * rowCount * 100), 0); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2229 | } |
| 2230 | } |
| 2231 | return 0; |
| 2232 | } |
| 2233 | |
| 2234 | @Override |
| 2235 | protected int computeVerticalScrollRange() { |
| 2236 | // TODO: Account for vertical spacing too |
| 2237 | final int numColumns = mNumColumns; |
| 2238 | final int rowCount = (mItemCount + numColumns - 1) / numColumns; |
Adam Powell | 637d337 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 2239 | int result = Math.max(rowCount * 100, 0); |
| 2240 | if (mScrollY != 0) { |
| 2241 | // Compensate for overscroll |
| 2242 | result += Math.abs((int) ((float) mScrollY / getHeight() * rowCount * 100)); |
| 2243 | } |
| 2244 | return result; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2245 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 2246 | |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 2247 | @Override |
| 2248 | public void onInitializeAccessibilityEvent(AccessibilityEvent event) { |
| 2249 | super.onInitializeAccessibilityEvent(event); |
| 2250 | event.setClassName(GridView.class.getName()); |
| 2251 | } |
| 2252 | |
| 2253 | @Override |
| 2254 | public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { |
| 2255 | super.onInitializeAccessibilityNodeInfo(info); |
| 2256 | info.setClassName(GridView.class.getName()); |
| 2257 | } |
| 2258 | } |