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; |
| 20 | import android.content.res.TypedArray; |
| 21 | import android.graphics.Rect; |
| 22 | import android.util.AttributeSet; |
| 23 | import android.view.Gravity; |
| 24 | import android.view.KeyEvent; |
| 25 | import android.view.View; |
| 26 | import android.view.ViewGroup; |
| 27 | import android.view.SoundEffectConstants; |
| 28 | import android.view.animation.GridLayoutAnimationController; |
| 29 | |
| 30 | |
| 31 | /** |
| 32 | * A view that shows items in two-dimensional scrolling grid. The items in the |
| 33 | * grid come from the {@link ListAdapter} associated with this view. |
Scott Main | 41ec653 | 2010-08-19 16:57:07 -0700 | [diff] [blame] | 34 | * |
| 35 | * <p>See the <a href="{@docRoot}resources/tutorials/views/hello-gridview.html">Grid |
| 36 | * View tutorial</a>.</p> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 37 | */ |
| 38 | public class GridView extends AbsListView { |
| 39 | public static final int NO_STRETCH = 0; |
| 40 | public static final int STRETCH_SPACING = 1; |
| 41 | public static final int STRETCH_COLUMN_WIDTH = 2; |
| 42 | public static final int STRETCH_SPACING_UNIFORM = 3; |
| 43 | |
| 44 | public static final int AUTO_FIT = -1; |
| 45 | |
| 46 | private int mNumColumns = AUTO_FIT; |
| 47 | |
| 48 | private int mHorizontalSpacing = 0; |
| 49 | private int mRequestedHorizontalSpacing; |
| 50 | private int mVerticalSpacing = 0; |
| 51 | private int mStretchMode = STRETCH_COLUMN_WIDTH; |
| 52 | private int mColumnWidth; |
| 53 | private int mRequestedColumnWidth; |
| 54 | private int mRequestedNumColumns; |
| 55 | |
| 56 | private View mReferenceView = null; |
| 57 | private View mReferenceViewInSelectedRow = null; |
| 58 | |
| 59 | private int mGravity = Gravity.LEFT; |
| 60 | |
| 61 | private final Rect mTempRect = new Rect(); |
| 62 | |
| 63 | public GridView(Context context) { |
| 64 | super(context); |
| 65 | } |
| 66 | |
| 67 | public GridView(Context context, AttributeSet attrs) { |
| 68 | this(context, attrs, com.android.internal.R.attr.gridViewStyle); |
| 69 | } |
| 70 | |
| 71 | public GridView(Context context, AttributeSet attrs, int defStyle) { |
| 72 | super(context, attrs, defStyle); |
| 73 | |
| 74 | TypedArray a = context.obtainStyledAttributes(attrs, |
| 75 | com.android.internal.R.styleable.GridView, defStyle, 0); |
| 76 | |
| 77 | int hSpacing = a.getDimensionPixelOffset( |
| 78 | com.android.internal.R.styleable.GridView_horizontalSpacing, 0); |
| 79 | setHorizontalSpacing(hSpacing); |
| 80 | |
| 81 | int vSpacing = a.getDimensionPixelOffset( |
| 82 | com.android.internal.R.styleable.GridView_verticalSpacing, 0); |
| 83 | setVerticalSpacing(vSpacing); |
| 84 | |
| 85 | int index = a.getInt(com.android.internal.R.styleable.GridView_stretchMode, STRETCH_COLUMN_WIDTH); |
| 86 | if (index >= 0) { |
| 87 | setStretchMode(index); |
| 88 | } |
| 89 | |
| 90 | int columnWidth = a.getDimensionPixelOffset(com.android.internal.R.styleable.GridView_columnWidth, -1); |
| 91 | if (columnWidth > 0) { |
| 92 | setColumnWidth(columnWidth); |
| 93 | } |
| 94 | |
| 95 | int numColumns = a.getInt(com.android.internal.R.styleable.GridView_numColumns, 1); |
| 96 | setNumColumns(numColumns); |
| 97 | |
| 98 | index = a.getInt(com.android.internal.R.styleable.GridView_gravity, -1); |
| 99 | if (index >= 0) { |
| 100 | setGravity(index); |
| 101 | } |
| 102 | |
| 103 | a.recycle(); |
| 104 | } |
| 105 | |
| 106 | @Override |
| 107 | public ListAdapter getAdapter() { |
| 108 | return mAdapter; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Sets the data behind this GridView. |
| 113 | * |
| 114 | * @param adapter the adapter providing the grid's data |
| 115 | */ |
| 116 | @Override |
| 117 | public void setAdapter(ListAdapter adapter) { |
| 118 | if (null != mAdapter) { |
| 119 | mAdapter.unregisterDataSetObserver(mDataSetObserver); |
| 120 | } |
| 121 | |
| 122 | resetList(); |
| 123 | mRecycler.clear(); |
| 124 | mAdapter = adapter; |
| 125 | |
| 126 | mOldSelectedPosition = INVALID_POSITION; |
| 127 | mOldSelectedRowId = INVALID_ROW_ID; |
| 128 | |
| 129 | if (mAdapter != null) { |
| 130 | mOldItemCount = mItemCount; |
| 131 | mItemCount = mAdapter.getCount(); |
| 132 | mDataChanged = true; |
| 133 | checkFocus(); |
| 134 | |
| 135 | mDataSetObserver = new AdapterDataSetObserver(); |
| 136 | mAdapter.registerDataSetObserver(mDataSetObserver); |
| 137 | |
| 138 | mRecycler.setViewTypeCount(mAdapter.getViewTypeCount()); |
| 139 | |
| 140 | int position; |
| 141 | if (mStackFromBottom) { |
| 142 | position = lookForSelectablePosition(mItemCount - 1, false); |
| 143 | } else { |
| 144 | position = lookForSelectablePosition(0, true); |
| 145 | } |
| 146 | setSelectedPositionInt(position); |
| 147 | setNextSelectedPositionInt(position); |
| 148 | checkSelectionChanged(); |
| 149 | } else { |
| 150 | checkFocus(); |
| 151 | // Nothing selected |
| 152 | checkSelectionChanged(); |
| 153 | } |
| 154 | |
| 155 | requestLayout(); |
| 156 | } |
| 157 | |
| 158 | @Override |
| 159 | int lookForSelectablePosition(int position, boolean lookDown) { |
| 160 | final ListAdapter adapter = mAdapter; |
| 161 | if (adapter == null || isInTouchMode()) { |
| 162 | return INVALID_POSITION; |
| 163 | } |
| 164 | |
| 165 | if (position < 0 || position >= mItemCount) { |
| 166 | return INVALID_POSITION; |
| 167 | } |
| 168 | return position; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * {@inheritDoc} |
| 173 | */ |
| 174 | @Override |
| 175 | void fillGap(boolean down) { |
| 176 | final int numColumns = mNumColumns; |
| 177 | final int verticalSpacing = mVerticalSpacing; |
| 178 | |
| 179 | final int count = getChildCount(); |
| 180 | |
| 181 | if (down) { |
| 182 | final int startOffset = count > 0 ? |
| 183 | getChildAt(count - 1).getBottom() + verticalSpacing : getListPaddingTop(); |
| 184 | int position = mFirstPosition + count; |
| 185 | if (mStackFromBottom) { |
| 186 | position += numColumns - 1; |
| 187 | } |
| 188 | fillDown(position, startOffset); |
| 189 | correctTooHigh(numColumns, verticalSpacing, getChildCount()); |
| 190 | } else { |
| 191 | final int startOffset = count > 0 ? |
| 192 | getChildAt(0).getTop() - verticalSpacing : getHeight() - getListPaddingBottom(); |
| 193 | int position = mFirstPosition; |
| 194 | if (!mStackFromBottom) { |
| 195 | position -= numColumns; |
| 196 | } else { |
| 197 | position--; |
| 198 | } |
| 199 | fillUp(position, startOffset); |
| 200 | correctTooLow(numColumns, verticalSpacing, getChildCount()); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * Fills the list from pos down to the end of the list view. |
| 206 | * |
| 207 | * @param pos The first position to put in the list |
| 208 | * |
| 209 | * @param nextTop The location where the top of the item associated with pos |
| 210 | * should be drawn |
| 211 | * |
| 212 | * @return The view that is currently selected, if it happens to be in the |
| 213 | * range that we draw. |
| 214 | */ |
| 215 | private View fillDown(int pos, int nextTop) { |
| 216 | View selectedView = null; |
| 217 | |
| 218 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 219 | |
| 220 | while (nextTop < end && pos < mItemCount) { |
| 221 | View temp = makeRow(pos, nextTop, true); |
| 222 | if (temp != null) { |
| 223 | selectedView = temp; |
| 224 | } |
| 225 | |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 226 | // mReferenceView will change with each call to makeRow() |
| 227 | // 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] | 228 | nextTop = mReferenceView.getBottom() + mVerticalSpacing; |
| 229 | |
| 230 | pos += mNumColumns; |
| 231 | } |
| 232 | |
| 233 | return selectedView; |
| 234 | } |
| 235 | |
| 236 | private View makeRow(int startPos, int y, boolean flow) { |
| 237 | final int columnWidth = mColumnWidth; |
| 238 | final int horizontalSpacing = mHorizontalSpacing; |
| 239 | |
| 240 | int last; |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 241 | int nextLeft = mListPadding.left + |
| 242 | ((mStretchMode == STRETCH_SPACING_UNIFORM) ? horizontalSpacing : 0); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 243 | |
| 244 | if (!mStackFromBottom) { |
| 245 | last = Math.min(startPos + mNumColumns, mItemCount); |
| 246 | } else { |
| 247 | last = startPos + 1; |
| 248 | startPos = Math.max(0, startPos - mNumColumns + 1); |
| 249 | |
| 250 | if (last - startPos < mNumColumns) { |
| 251 | nextLeft += (mNumColumns - (last - startPos)) * (columnWidth + horizontalSpacing); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | View selectedView = null; |
| 256 | |
| 257 | final boolean hasFocus = shouldShowSelector(); |
| 258 | final boolean inClick = touchModeDrawsInPressedState(); |
| 259 | final int selectedPosition = mSelectedPosition; |
| 260 | |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 261 | View child = null; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 262 | for (int pos = startPos; pos < last; pos++) { |
| 263 | // is this the selected item? |
| 264 | boolean selected = pos == selectedPosition; |
| 265 | // does the list view have focus or contain focus |
| 266 | |
| 267 | final int where = flow ? -1 : pos - startPos; |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 268 | child = makeAndAddView(pos, y, flow, nextLeft, selected, where); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 269 | |
| 270 | nextLeft += columnWidth; |
| 271 | if (pos < last - 1) { |
| 272 | nextLeft += horizontalSpacing; |
| 273 | } |
| 274 | |
| 275 | if (selected && (hasFocus || inClick)) { |
| 276 | selectedView = child; |
| 277 | } |
| 278 | } |
| 279 | |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 280 | mReferenceView = child; |
| 281 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 282 | if (selectedView != null) { |
| 283 | mReferenceViewInSelectedRow = mReferenceView; |
| 284 | } |
| 285 | |
| 286 | return selectedView; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Fills the list from pos up to the top of the list view. |
| 291 | * |
| 292 | * @param pos The first position to put in the list |
| 293 | * |
| 294 | * @param nextBottom The location where the bottom of the item associated |
| 295 | * with pos should be drawn |
| 296 | * |
| 297 | * @return The view that is currently selected |
| 298 | */ |
| 299 | private View fillUp(int pos, int nextBottom) { |
| 300 | View selectedView = null; |
| 301 | |
| 302 | final int end = mListPadding.top; |
| 303 | |
| 304 | while (nextBottom > end && pos >= 0) { |
| 305 | |
| 306 | View temp = makeRow(pos, nextBottom, false); |
| 307 | if (temp != null) { |
| 308 | selectedView = temp; |
| 309 | } |
| 310 | |
| 311 | nextBottom = mReferenceView.getTop() - mVerticalSpacing; |
| 312 | |
| 313 | mFirstPosition = pos; |
| 314 | |
| 315 | pos -= mNumColumns; |
| 316 | } |
| 317 | |
| 318 | if (mStackFromBottom) { |
| 319 | mFirstPosition = Math.max(0, pos + 1); |
| 320 | } |
| 321 | |
| 322 | return selectedView; |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * Fills the list from top to bottom, starting with mFirstPosition |
| 327 | * |
| 328 | * @param nextTop The location where the top of the first item should be |
| 329 | * drawn |
| 330 | * |
| 331 | * @return The view that is currently selected |
| 332 | */ |
| 333 | private View fillFromTop(int nextTop) { |
| 334 | mFirstPosition = Math.min(mFirstPosition, mSelectedPosition); |
| 335 | mFirstPosition = Math.min(mFirstPosition, mItemCount - 1); |
| 336 | if (mFirstPosition < 0) { |
| 337 | mFirstPosition = 0; |
| 338 | } |
| 339 | mFirstPosition -= mFirstPosition % mNumColumns; |
| 340 | return fillDown(mFirstPosition, nextTop); |
| 341 | } |
| 342 | |
| 343 | private View fillFromBottom(int lastPosition, int nextBottom) { |
| 344 | lastPosition = Math.max(lastPosition, mSelectedPosition); |
| 345 | lastPosition = Math.min(lastPosition, mItemCount - 1); |
| 346 | |
| 347 | final int invertedPosition = mItemCount - 1 - lastPosition; |
| 348 | lastPosition = mItemCount - 1 - (invertedPosition - (invertedPosition % mNumColumns)); |
| 349 | |
| 350 | return fillUp(lastPosition, nextBottom); |
| 351 | } |
| 352 | |
| 353 | private View fillSelection(int childrenTop, int childrenBottom) { |
| 354 | final int selectedPosition = reconcileSelectedPosition(); |
| 355 | final int numColumns = mNumColumns; |
| 356 | final int verticalSpacing = mVerticalSpacing; |
| 357 | |
| 358 | int rowStart; |
| 359 | int rowEnd = -1; |
| 360 | |
| 361 | if (!mStackFromBottom) { |
| 362 | rowStart = selectedPosition - (selectedPosition % numColumns); |
| 363 | } else { |
| 364 | final int invertedSelection = mItemCount - 1 - selectedPosition; |
| 365 | |
| 366 | rowEnd = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 367 | rowStart = Math.max(0, rowEnd - numColumns + 1); |
| 368 | } |
| 369 | |
| 370 | final int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 371 | final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, rowStart); |
| 372 | |
| 373 | final View sel = makeRow(mStackFromBottom ? rowEnd : rowStart, topSelectionPixel, true); |
| 374 | mFirstPosition = rowStart; |
| 375 | |
| 376 | final View referenceView = mReferenceView; |
| 377 | |
| 378 | if (!mStackFromBottom) { |
| 379 | fillDown(rowStart + numColumns, referenceView.getBottom() + verticalSpacing); |
| 380 | pinToBottom(childrenBottom); |
| 381 | fillUp(rowStart - numColumns, referenceView.getTop() - verticalSpacing); |
| 382 | adjustViewsUpOrDown(); |
| 383 | } else { |
| 384 | final int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, |
| 385 | fadingEdgeLength, numColumns, rowStart); |
| 386 | final int offset = bottomSelectionPixel - referenceView.getBottom(); |
| 387 | offsetChildrenTopAndBottom(offset); |
| 388 | fillUp(rowStart - 1, referenceView.getTop() - verticalSpacing); |
| 389 | pinToTop(childrenTop); |
| 390 | fillDown(rowEnd + numColumns, referenceView.getBottom() + verticalSpacing); |
| 391 | adjustViewsUpOrDown(); |
| 392 | } |
| 393 | |
| 394 | return sel; |
| 395 | } |
| 396 | |
| 397 | private void pinToTop(int childrenTop) { |
| 398 | if (mFirstPosition == 0) { |
| 399 | final int top = getChildAt(0).getTop(); |
| 400 | final int offset = childrenTop - top; |
| 401 | if (offset < 0) { |
| 402 | offsetChildrenTopAndBottom(offset); |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | private void pinToBottom(int childrenBottom) { |
| 408 | final int count = getChildCount(); |
| 409 | if (mFirstPosition + count == mItemCount) { |
| 410 | final int bottom = getChildAt(count - 1).getBottom(); |
| 411 | final int offset = childrenBottom - bottom; |
| 412 | if (offset > 0) { |
| 413 | offsetChildrenTopAndBottom(offset); |
| 414 | } |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | @Override |
| 419 | int findMotionRow(int y) { |
| 420 | final int childCount = getChildCount(); |
| 421 | if (childCount > 0) { |
| 422 | |
| 423 | final int numColumns = mNumColumns; |
| 424 | if (!mStackFromBottom) { |
| 425 | for (int i = 0; i < childCount; i += numColumns) { |
| 426 | if (y <= getChildAt(i).getBottom()) { |
| 427 | return mFirstPosition + i; |
| 428 | } |
| 429 | } |
| 430 | } else { |
| 431 | for (int i = childCount - 1; i >= 0; i -= numColumns) { |
| 432 | if (y >= getChildAt(i).getTop()) { |
| 433 | return mFirstPosition + i; |
| 434 | } |
| 435 | } |
| 436 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 437 | } |
| 438 | return INVALID_POSITION; |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * Layout during a scroll that results from tracking motion events. Places |
| 443 | * the mMotionPosition view at the offset specified by mMotionViewTop, and |
| 444 | * then build surrounding views from there. |
| 445 | * |
| 446 | * @param position the position at which to start filling |
| 447 | * @param top the top of the view at that position |
| 448 | * @return The selected view, or null if the selected view is outside the |
| 449 | * visible area. |
| 450 | */ |
| 451 | private View fillSpecific(int position, int top) { |
| 452 | final int numColumns = mNumColumns; |
| 453 | |
| 454 | int motionRowStart; |
| 455 | int motionRowEnd = -1; |
| 456 | |
| 457 | if (!mStackFromBottom) { |
| 458 | motionRowStart = position - (position % numColumns); |
| 459 | } else { |
| 460 | final int invertedSelection = mItemCount - 1 - position; |
| 461 | |
| 462 | motionRowEnd = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 463 | motionRowStart = Math.max(0, motionRowEnd - numColumns + 1); |
| 464 | } |
| 465 | |
| 466 | final View temp = makeRow(mStackFromBottom ? motionRowEnd : motionRowStart, top, true); |
| 467 | |
| 468 | // Possibly changed again in fillUp if we add rows above this one. |
| 469 | mFirstPosition = motionRowStart; |
| 470 | |
| 471 | final View referenceView = mReferenceView; |
Romain Guy | 8bcdc07 | 2009-09-29 15:17:47 -0700 | [diff] [blame] | 472 | // We didn't have anything to layout, bail out |
| 473 | if (referenceView == null) { |
| 474 | return null; |
| 475 | } |
| 476 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 477 | final int verticalSpacing = mVerticalSpacing; |
| 478 | |
| 479 | View above; |
| 480 | View below; |
| 481 | |
| 482 | if (!mStackFromBottom) { |
| 483 | above = fillUp(motionRowStart - numColumns, referenceView.getTop() - verticalSpacing); |
| 484 | adjustViewsUpOrDown(); |
| 485 | below = fillDown(motionRowStart + numColumns, referenceView.getBottom() + verticalSpacing); |
| 486 | // Check if we have dragged the bottom of the grid too high |
| 487 | final int childCount = getChildCount(); |
| 488 | if (childCount > 0) { |
| 489 | correctTooHigh(numColumns, verticalSpacing, childCount); |
| 490 | } |
| 491 | } else { |
| 492 | below = fillDown(motionRowEnd + numColumns, referenceView.getBottom() + verticalSpacing); |
| 493 | adjustViewsUpOrDown(); |
| 494 | above = fillUp(motionRowStart - 1, referenceView.getTop() - verticalSpacing); |
| 495 | // Check if we have dragged the bottom of the grid too high |
| 496 | final int childCount = getChildCount(); |
| 497 | if (childCount > 0) { |
| 498 | correctTooLow(numColumns, verticalSpacing, childCount); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | if (temp != null) { |
| 503 | return temp; |
| 504 | } else if (above != null) { |
| 505 | return above; |
| 506 | } else { |
| 507 | return below; |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | private void correctTooHigh(int numColumns, int verticalSpacing, int childCount) { |
| 512 | // First see if the last item is visible |
| 513 | final int lastPosition = mFirstPosition + childCount - 1; |
| 514 | if (lastPosition == mItemCount - 1 && childCount > 0) { |
| 515 | // Get the last child ... |
| 516 | final View lastChild = getChildAt(childCount - 1); |
| 517 | |
| 518 | // ... and its bottom edge |
| 519 | final int lastBottom = lastChild.getBottom(); |
| 520 | // This is bottom of our drawable area |
| 521 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 522 | |
| 523 | // This is how far the bottom edge of the last view is from the bottom of the |
| 524 | // drawable area |
| 525 | int bottomOffset = end - lastBottom; |
| 526 | |
| 527 | final View firstChild = getChildAt(0); |
| 528 | final int firstTop = firstChild.getTop(); |
| 529 | |
| 530 | // Make sure we are 1) Too high, and 2) Either there are more rows above the |
| 531 | // first row or the first row is scrolled off the top of the drawable area |
| 532 | if (bottomOffset > 0 && (mFirstPosition > 0 || firstTop < mListPadding.top)) { |
| 533 | if (mFirstPosition == 0) { |
| 534 | // Don't pull the top too far down |
| 535 | bottomOffset = Math.min(bottomOffset, mListPadding.top - firstTop); |
| 536 | } |
| 537 | |
| 538 | // Move everything down |
| 539 | offsetChildrenTopAndBottom(bottomOffset); |
| 540 | if (mFirstPosition > 0) { |
| 541 | // Fill the gap that was opened above mFirstPosition with more rows, if |
| 542 | // possible |
| 543 | fillUp(mFirstPosition - (mStackFromBottom ? 1 : numColumns), |
| 544 | firstChild.getTop() - verticalSpacing); |
| 545 | // Close up the remaining gap |
| 546 | adjustViewsUpOrDown(); |
| 547 | } |
| 548 | } |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | private void correctTooLow(int numColumns, int verticalSpacing, int childCount) { |
| 553 | if (mFirstPosition == 0 && childCount > 0) { |
| 554 | // Get the first child ... |
| 555 | final View firstChild = getChildAt(0); |
| 556 | |
| 557 | // ... and its top edge |
| 558 | final int firstTop = firstChild.getTop(); |
| 559 | |
| 560 | // This is top of our drawable area |
| 561 | final int start = mListPadding.top; |
| 562 | |
| 563 | // This is bottom of our drawable area |
| 564 | final int end = (mBottom - mTop) - mListPadding.bottom; |
| 565 | |
| 566 | // This is how far the top edge of the first view is from the top of the |
| 567 | // drawable area |
| 568 | int topOffset = firstTop - start; |
| 569 | final View lastChild = getChildAt(childCount - 1); |
| 570 | final int lastBottom = lastChild.getBottom(); |
| 571 | final int lastPosition = mFirstPosition + childCount - 1; |
| 572 | |
| 573 | // Make sure we are 1) Too low, and 2) Either there are more rows below the |
| 574 | // last row or the last row is scrolled off the bottom of the drawable area |
| 575 | if (topOffset > 0 && (lastPosition < mItemCount - 1 || lastBottom > end)) { |
| 576 | if (lastPosition == mItemCount - 1 ) { |
| 577 | // Don't pull the bottom too far up |
| 578 | topOffset = Math.min(topOffset, lastBottom - end); |
| 579 | } |
| 580 | |
| 581 | // Move everything up |
| 582 | offsetChildrenTopAndBottom(-topOffset); |
| 583 | if (lastPosition < mItemCount - 1) { |
| 584 | // Fill the gap that was opened below the last position with more rows, if |
| 585 | // possible |
| 586 | fillDown(lastPosition + (!mStackFromBottom ? 1 : numColumns), |
| 587 | lastChild.getBottom() + verticalSpacing); |
| 588 | // Close up the remaining gap |
| 589 | adjustViewsUpOrDown(); |
| 590 | } |
| 591 | } |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | /** |
| 596 | * Fills the grid based on positioning the new selection at a specific |
| 597 | * location. The selection may be moved so that it does not intersect the |
| 598 | * faded edges. The grid is then filled upwards and downwards from there. |
| 599 | * |
| 600 | * @param selectedTop Where the selected item should be |
| 601 | * @param childrenTop Where to start drawing children |
| 602 | * @param childrenBottom Last pixel where children can be drawn |
| 603 | * @return The view that currently has selection |
| 604 | */ |
| 605 | private View fillFromSelection(int selectedTop, int childrenTop, int childrenBottom) { |
| 606 | final int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 607 | final int selectedPosition = mSelectedPosition; |
| 608 | final int numColumns = mNumColumns; |
| 609 | final int verticalSpacing = mVerticalSpacing; |
| 610 | |
| 611 | int rowStart; |
| 612 | int rowEnd = -1; |
| 613 | |
| 614 | if (!mStackFromBottom) { |
| 615 | rowStart = selectedPosition - (selectedPosition % numColumns); |
| 616 | } else { |
| 617 | int invertedSelection = mItemCount - 1 - selectedPosition; |
| 618 | |
| 619 | rowEnd = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 620 | rowStart = Math.max(0, rowEnd - numColumns + 1); |
| 621 | } |
| 622 | |
| 623 | View sel; |
| 624 | View referenceView; |
| 625 | |
| 626 | int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, rowStart); |
| 627 | int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, fadingEdgeLength, |
| 628 | numColumns, rowStart); |
| 629 | |
| 630 | sel = makeRow(mStackFromBottom ? rowEnd : rowStart, selectedTop, true); |
| 631 | // Possibly changed again in fillUp if we add rows above this one. |
| 632 | mFirstPosition = rowStart; |
| 633 | |
| 634 | referenceView = mReferenceView; |
| 635 | adjustForTopFadingEdge(referenceView, topSelectionPixel, bottomSelectionPixel); |
| 636 | adjustForBottomFadingEdge(referenceView, topSelectionPixel, bottomSelectionPixel); |
| 637 | |
| 638 | if (!mStackFromBottom) { |
| 639 | fillUp(rowStart - numColumns, referenceView.getTop() - verticalSpacing); |
| 640 | adjustViewsUpOrDown(); |
| 641 | fillDown(rowStart + numColumns, referenceView.getBottom() + verticalSpacing); |
| 642 | } else { |
| 643 | fillDown(rowEnd + numColumns, referenceView.getBottom() + verticalSpacing); |
| 644 | adjustViewsUpOrDown(); |
| 645 | fillUp(rowStart - 1, referenceView.getTop() - verticalSpacing); |
| 646 | } |
| 647 | |
| 648 | |
| 649 | return sel; |
| 650 | } |
| 651 | |
| 652 | /** |
| 653 | * Calculate the bottom-most pixel we can draw the selection into |
| 654 | * |
| 655 | * @param childrenBottom Bottom pixel were children can be drawn |
| 656 | * @param fadingEdgeLength Length of the fading edge in pixels, if present |
| 657 | * @param numColumns Number of columns in the grid |
| 658 | * @param rowStart The start of the row that will contain the selection |
| 659 | * @return The bottom-most pixel we can draw the selection into |
| 660 | */ |
| 661 | private int getBottomSelectionPixel(int childrenBottom, int fadingEdgeLength, |
| 662 | int numColumns, int rowStart) { |
| 663 | // Last pixel we can draw the selection into |
| 664 | int bottomSelectionPixel = childrenBottom; |
| 665 | if (rowStart + numColumns - 1 < mItemCount - 1) { |
| 666 | bottomSelectionPixel -= fadingEdgeLength; |
| 667 | } |
| 668 | return bottomSelectionPixel; |
| 669 | } |
| 670 | |
| 671 | /** |
| 672 | * Calculate the top-most pixel we can draw the selection into |
| 673 | * |
| 674 | * @param childrenTop Top pixel were children can be drawn |
| 675 | * @param fadingEdgeLength Length of the fading edge in pixels, if present |
| 676 | * @param rowStart The start of the row that will contain the selection |
| 677 | * @return The top-most pixel we can draw the selection into |
| 678 | */ |
| 679 | private int getTopSelectionPixel(int childrenTop, int fadingEdgeLength, int rowStart) { |
| 680 | // first pixel we can draw the selection into |
| 681 | int topSelectionPixel = childrenTop; |
| 682 | if (rowStart > 0) { |
| 683 | topSelectionPixel += fadingEdgeLength; |
| 684 | } |
| 685 | return topSelectionPixel; |
| 686 | } |
| 687 | |
| 688 | /** |
| 689 | * Move all views upwards so the selected row does not interesect the bottom |
| 690 | * fading edge (if necessary). |
| 691 | * |
| 692 | * @param childInSelectedRow A child in the row that contains the selection |
| 693 | * @param topSelectionPixel The topmost pixel we can draw the selection into |
| 694 | * @param bottomSelectionPixel The bottommost pixel we can draw the |
| 695 | * selection into |
| 696 | */ |
| 697 | private void adjustForBottomFadingEdge(View childInSelectedRow, |
| 698 | int topSelectionPixel, int bottomSelectionPixel) { |
| 699 | // Some of the newly selected item extends below the bottom of the |
| 700 | // list |
| 701 | if (childInSelectedRow.getBottom() > bottomSelectionPixel) { |
| 702 | |
| 703 | // Find space available above the selection into which we can |
| 704 | // scroll upwards |
| 705 | int spaceAbove = childInSelectedRow.getTop() - topSelectionPixel; |
| 706 | |
| 707 | // Find space required to bring the bottom of the selected item |
| 708 | // fully into view |
| 709 | int spaceBelow = childInSelectedRow.getBottom() - bottomSelectionPixel; |
| 710 | int offset = Math.min(spaceAbove, spaceBelow); |
| 711 | |
| 712 | // Now offset the selected item to get it into view |
| 713 | offsetChildrenTopAndBottom(-offset); |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | /** |
| 718 | * Move all views upwards so the selected row does not interesect the top |
| 719 | * fading edge (if necessary). |
| 720 | * |
| 721 | * @param childInSelectedRow A child in the row that contains the selection |
| 722 | * @param topSelectionPixel The topmost pixel we can draw the selection into |
| 723 | * @param bottomSelectionPixel The bottommost pixel we can draw the |
| 724 | * selection into |
| 725 | */ |
| 726 | private void adjustForTopFadingEdge(View childInSelectedRow, |
| 727 | int topSelectionPixel, int bottomSelectionPixel) { |
| 728 | // Some of the newly selected item extends above the top of the list |
| 729 | if (childInSelectedRow.getTop() < topSelectionPixel) { |
| 730 | // Find space required to bring the top of the selected item |
| 731 | // fully into view |
| 732 | int spaceAbove = topSelectionPixel - childInSelectedRow.getTop(); |
| 733 | |
| 734 | // Find space available below the selection into which we can |
| 735 | // scroll downwards |
| 736 | int spaceBelow = bottomSelectionPixel - childInSelectedRow.getBottom(); |
| 737 | int offset = Math.min(spaceAbove, spaceBelow); |
| 738 | |
| 739 | // Now offset the selected item to get it into view |
| 740 | offsetChildrenTopAndBottom(offset); |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | /** |
| 745 | * Fills the grid based on positioning the new selection relative to the old |
| 746 | * selection. The new selection will be placed at, above, or below the |
| 747 | * location of the new selection depending on how the selection is moving. |
| 748 | * The selection will then be pinned to the visible part of the screen, |
| 749 | * excluding the edges that are faded. The grid is then filled upwards and |
| 750 | * downwards from there. |
| 751 | * |
| 752 | * @param delta Which way we are moving |
| 753 | * @param childrenTop Where to start drawing children |
| 754 | * @param childrenBottom Last pixel where children can be drawn |
| 755 | * @return The view that currently has selection |
| 756 | */ |
| 757 | private View moveSelection(int delta, int childrenTop, int childrenBottom) { |
| 758 | final int fadingEdgeLength = getVerticalFadingEdgeLength(); |
| 759 | final int selectedPosition = mSelectedPosition; |
| 760 | final int numColumns = mNumColumns; |
| 761 | final int verticalSpacing = mVerticalSpacing; |
| 762 | |
| 763 | int oldRowStart; |
| 764 | int rowStart; |
| 765 | int rowEnd = -1; |
| 766 | |
| 767 | if (!mStackFromBottom) { |
| 768 | oldRowStart = (selectedPosition - delta) - ((selectedPosition - delta) % numColumns); |
| 769 | |
| 770 | rowStart = selectedPosition - (selectedPosition % numColumns); |
| 771 | } else { |
| 772 | int invertedSelection = mItemCount - 1 - selectedPosition; |
| 773 | |
| 774 | rowEnd = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 775 | rowStart = Math.max(0, rowEnd - numColumns + 1); |
| 776 | |
| 777 | invertedSelection = mItemCount - 1 - (selectedPosition - delta); |
| 778 | oldRowStart = mItemCount - 1 - (invertedSelection - (invertedSelection % numColumns)); |
| 779 | oldRowStart = Math.max(0, oldRowStart - numColumns + 1); |
| 780 | } |
| 781 | |
| 782 | final int rowDelta = rowStart - oldRowStart; |
| 783 | |
| 784 | final int topSelectionPixel = getTopSelectionPixel(childrenTop, fadingEdgeLength, rowStart); |
| 785 | final int bottomSelectionPixel = getBottomSelectionPixel(childrenBottom, fadingEdgeLength, |
| 786 | numColumns, rowStart); |
| 787 | |
| 788 | // Possibly changed again in fillUp if we add rows above this one. |
| 789 | mFirstPosition = rowStart; |
| 790 | |
| 791 | View sel; |
| 792 | View referenceView; |
| 793 | |
| 794 | if (rowDelta > 0) { |
| 795 | /* |
| 796 | * Case 1: Scrolling down. |
| 797 | */ |
| 798 | |
| 799 | final int oldBottom = mReferenceViewInSelectedRow == null ? 0 : |
| 800 | mReferenceViewInSelectedRow.getBottom(); |
| 801 | |
| 802 | sel = makeRow(mStackFromBottom ? rowEnd : rowStart, oldBottom + verticalSpacing, true); |
| 803 | referenceView = mReferenceView; |
| 804 | |
| 805 | adjustForBottomFadingEdge(referenceView, topSelectionPixel, bottomSelectionPixel); |
| 806 | } else if (rowDelta < 0) { |
| 807 | /* |
| 808 | * Case 2: Scrolling up. |
| 809 | */ |
| 810 | final int oldTop = mReferenceViewInSelectedRow == null ? |
| 811 | 0 : mReferenceViewInSelectedRow .getTop(); |
| 812 | |
| 813 | sel = makeRow(mStackFromBottom ? rowEnd : rowStart, oldTop - verticalSpacing, false); |
| 814 | referenceView = mReferenceView; |
| 815 | |
| 816 | adjustForTopFadingEdge(referenceView, topSelectionPixel, bottomSelectionPixel); |
| 817 | } else { |
| 818 | /* |
| 819 | * Keep selection where it was |
| 820 | */ |
| 821 | final int oldTop = mReferenceViewInSelectedRow == null ? |
| 822 | 0 : mReferenceViewInSelectedRow .getTop(); |
| 823 | |
| 824 | sel = makeRow(mStackFromBottom ? rowEnd : rowStart, oldTop, true); |
| 825 | referenceView = mReferenceView; |
| 826 | } |
| 827 | |
| 828 | if (!mStackFromBottom) { |
| 829 | fillUp(rowStart - numColumns, referenceView.getTop() - verticalSpacing); |
| 830 | adjustViewsUpOrDown(); |
| 831 | fillDown(rowStart + numColumns, referenceView.getBottom() + verticalSpacing); |
| 832 | } else { |
| 833 | fillDown(rowEnd + numColumns, referenceView.getBottom() + verticalSpacing); |
| 834 | adjustViewsUpOrDown(); |
| 835 | fillUp(rowStart - 1, referenceView.getTop() - verticalSpacing); |
| 836 | } |
| 837 | |
| 838 | return sel; |
| 839 | } |
| 840 | |
| 841 | private void determineColumns(int availableSpace) { |
| 842 | final int requestedHorizontalSpacing = mRequestedHorizontalSpacing; |
| 843 | final int stretchMode = mStretchMode; |
| 844 | final int requestedColumnWidth = mRequestedColumnWidth; |
| 845 | |
| 846 | if (mRequestedNumColumns == AUTO_FIT) { |
| 847 | if (requestedColumnWidth > 0) { |
| 848 | // Client told us to pick the number of columns |
| 849 | mNumColumns = (availableSpace + requestedHorizontalSpacing) / |
| 850 | (requestedColumnWidth + requestedHorizontalSpacing); |
| 851 | } else { |
| 852 | // Just make up a number if we don't have enough info |
| 853 | mNumColumns = 2; |
| 854 | } |
| 855 | } else { |
| 856 | // We picked the columns |
| 857 | mNumColumns = mRequestedNumColumns; |
| 858 | } |
| 859 | |
| 860 | if (mNumColumns <= 0) { |
| 861 | mNumColumns = 1; |
| 862 | } |
| 863 | |
| 864 | switch (stretchMode) { |
| 865 | case NO_STRETCH: |
| 866 | // Nobody stretches |
| 867 | mColumnWidth = requestedColumnWidth; |
| 868 | mHorizontalSpacing = requestedHorizontalSpacing; |
| 869 | break; |
| 870 | |
| 871 | default: |
| 872 | int spaceLeftOver = availableSpace - (mNumColumns * requestedColumnWidth) - |
| 873 | ((mNumColumns - 1) * requestedHorizontalSpacing); |
| 874 | switch (stretchMode) { |
| 875 | case STRETCH_COLUMN_WIDTH: |
| 876 | // Stretch the columns |
| 877 | mColumnWidth = requestedColumnWidth + spaceLeftOver / mNumColumns; |
| 878 | mHorizontalSpacing = requestedHorizontalSpacing; |
| 879 | break; |
| 880 | |
| 881 | case STRETCH_SPACING: |
| 882 | // Stretch the spacing between columns |
| 883 | mColumnWidth = requestedColumnWidth; |
| 884 | if (mNumColumns > 1) { |
| 885 | mHorizontalSpacing = requestedHorizontalSpacing + |
| 886 | spaceLeftOver / (mNumColumns - 1); |
| 887 | } else { |
| 888 | mHorizontalSpacing = requestedHorizontalSpacing + spaceLeftOver; |
| 889 | } |
| 890 | break; |
| 891 | |
| 892 | case STRETCH_SPACING_UNIFORM: |
| 893 | // Stretch the spacing between columns |
| 894 | mColumnWidth = requestedColumnWidth; |
| 895 | if (mNumColumns > 1) { |
| 896 | mHorizontalSpacing = requestedHorizontalSpacing + |
| 897 | spaceLeftOver / (mNumColumns + 1); |
| 898 | } else { |
| 899 | mHorizontalSpacing = requestedHorizontalSpacing + spaceLeftOver; |
| 900 | } |
| 901 | break; |
| 902 | } |
| 903 | |
| 904 | break; |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | @Override |
| 909 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 910 | // Sets up mListPadding |
| 911 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| 912 | |
| 913 | int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| 914 | int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| 915 | int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
| 916 | int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| 917 | |
| 918 | if (widthMode == MeasureSpec.UNSPECIFIED) { |
| 919 | if (mColumnWidth > 0) { |
| 920 | widthSize = mColumnWidth + mListPadding.left + mListPadding.right; |
| 921 | } else { |
| 922 | widthSize = mListPadding.left + mListPadding.right; |
| 923 | } |
| 924 | widthSize += getVerticalScrollbarWidth(); |
| 925 | } |
| 926 | |
| 927 | int childWidth = widthSize - mListPadding.left - mListPadding.right; |
| 928 | determineColumns(childWidth); |
| 929 | |
| 930 | int childHeight = 0; |
| 931 | |
| 932 | mItemCount = mAdapter == null ? 0 : mAdapter.getCount(); |
| 933 | final int count = mItemCount; |
| 934 | if (count > 0) { |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 935 | final View child = obtainView(0, mIsScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 936 | |
| 937 | AbsListView.LayoutParams p = (AbsListView.LayoutParams)child.getLayoutParams(); |
| 938 | if (p == null) { |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 939 | p = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 940 | ViewGroup.LayoutParams.WRAP_CONTENT, 0); |
The Android Open Source Project | 4df2423 | 2009-03-05 14:34:35 -0800 | [diff] [blame] | 941 | child.setLayoutParams(p); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 942 | } |
| 943 | p.viewType = mAdapter.getItemViewType(0); |
Romain Guy | 0bf8859 | 2010-03-02 13:38:44 -0800 | [diff] [blame] | 944 | p.forceAdd = true; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 945 | |
| 946 | int childHeightSpec = getChildMeasureSpec( |
| 947 | MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 0, p.height); |
| 948 | int childWidthSpec = getChildMeasureSpec( |
| 949 | MeasureSpec.makeMeasureSpec(mColumnWidth, MeasureSpec.EXACTLY), 0, p.width); |
| 950 | child.measure(childWidthSpec, childHeightSpec); |
| 951 | |
| 952 | childHeight = child.getMeasuredHeight(); |
| 953 | |
| 954 | if (mRecycler.shouldRecycleViewType(p.viewType)) { |
| 955 | mRecycler.addScrapView(child); |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | if (heightMode == MeasureSpec.UNSPECIFIED) { |
| 960 | heightSize = mListPadding.top + mListPadding.bottom + childHeight + |
| 961 | getVerticalFadingEdgeLength() * 2; |
| 962 | } |
| 963 | |
| 964 | if (heightMode == MeasureSpec.AT_MOST) { |
| 965 | int ourSize = mListPadding.top + mListPadding.bottom; |
| 966 | |
| 967 | final int numColumns = mNumColumns; |
| 968 | for (int i = 0; i < count; i += numColumns) { |
| 969 | ourSize += childHeight; |
| 970 | if (i + numColumns < count) { |
| 971 | ourSize += mVerticalSpacing; |
| 972 | } |
| 973 | if (ourSize >= heightSize) { |
| 974 | ourSize = heightSize; |
| 975 | break; |
| 976 | } |
| 977 | } |
| 978 | heightSize = ourSize; |
| 979 | } |
| 980 | |
| 981 | setMeasuredDimension(widthSize, heightSize); |
| 982 | mWidthMeasureSpec = widthMeasureSpec; |
| 983 | } |
| 984 | |
| 985 | @Override |
| 986 | protected void attachLayoutAnimationParameters(View child, |
| 987 | ViewGroup.LayoutParams params, int index, int count) { |
| 988 | |
| 989 | GridLayoutAnimationController.AnimationParameters animationParams = |
| 990 | (GridLayoutAnimationController.AnimationParameters) params.layoutAnimationParameters; |
| 991 | |
| 992 | if (animationParams == null) { |
| 993 | animationParams = new GridLayoutAnimationController.AnimationParameters(); |
| 994 | params.layoutAnimationParameters = animationParams; |
| 995 | } |
| 996 | |
| 997 | animationParams.count = count; |
| 998 | animationParams.index = index; |
| 999 | animationParams.columnsCount = mNumColumns; |
| 1000 | animationParams.rowsCount = count / mNumColumns; |
| 1001 | |
| 1002 | if (!mStackFromBottom) { |
| 1003 | animationParams.column = index % mNumColumns; |
| 1004 | animationParams.row = index / mNumColumns; |
| 1005 | } else { |
| 1006 | final int invertedIndex = count - 1 - index; |
| 1007 | |
| 1008 | animationParams.column = mNumColumns - 1 - (invertedIndex % mNumColumns); |
| 1009 | animationParams.row = animationParams.rowsCount - 1 - invertedIndex / mNumColumns; |
| 1010 | } |
| 1011 | } |
| 1012 | |
| 1013 | @Override |
| 1014 | protected void layoutChildren() { |
| 1015 | final boolean blockLayoutRequests = mBlockLayoutRequests; |
| 1016 | if (!blockLayoutRequests) { |
| 1017 | mBlockLayoutRequests = true; |
| 1018 | } |
| 1019 | |
| 1020 | try { |
| 1021 | super.layoutChildren(); |
| 1022 | |
| 1023 | invalidate(); |
| 1024 | |
| 1025 | if (mAdapter == null) { |
| 1026 | resetList(); |
| 1027 | invokeOnItemScrollListener(); |
| 1028 | return; |
| 1029 | } |
| 1030 | |
| 1031 | final int childrenTop = mListPadding.top; |
| 1032 | final int childrenBottom = mBottom - mTop - mListPadding.bottom; |
| 1033 | |
| 1034 | int childCount = getChildCount(); |
| 1035 | int index; |
| 1036 | int delta = 0; |
| 1037 | |
| 1038 | View sel; |
| 1039 | View oldSel = null; |
| 1040 | View oldFirst = null; |
| 1041 | View newSel = null; |
| 1042 | |
| 1043 | // Remember stuff we will need down below |
| 1044 | switch (mLayoutMode) { |
| 1045 | case LAYOUT_SET_SELECTION: |
| 1046 | index = mNextSelectedPosition - mFirstPosition; |
| 1047 | if (index >= 0 && index < childCount) { |
| 1048 | newSel = getChildAt(index); |
| 1049 | } |
| 1050 | break; |
| 1051 | case LAYOUT_FORCE_TOP: |
| 1052 | case LAYOUT_FORCE_BOTTOM: |
| 1053 | case LAYOUT_SPECIFIC: |
| 1054 | case LAYOUT_SYNC: |
| 1055 | break; |
| 1056 | case LAYOUT_MOVE_SELECTION: |
| 1057 | if (mNextSelectedPosition >= 0) { |
| 1058 | delta = mNextSelectedPosition - mSelectedPosition; |
| 1059 | } |
| 1060 | break; |
| 1061 | default: |
| 1062 | // Remember the previously selected view |
| 1063 | index = mSelectedPosition - mFirstPosition; |
| 1064 | if (index >= 0 && index < childCount) { |
| 1065 | oldSel = getChildAt(index); |
| 1066 | } |
| 1067 | |
| 1068 | // Remember the previous first child |
| 1069 | oldFirst = getChildAt(0); |
| 1070 | } |
| 1071 | |
| 1072 | boolean dataChanged = mDataChanged; |
| 1073 | if (dataChanged) { |
| 1074 | handleDataChanged(); |
| 1075 | } |
| 1076 | |
| 1077 | // Handle the empty set by removing all views that are visible |
| 1078 | // and calling it a day |
| 1079 | if (mItemCount == 0) { |
| 1080 | resetList(); |
| 1081 | invokeOnItemScrollListener(); |
| 1082 | return; |
| 1083 | } |
| 1084 | |
| 1085 | setSelectedPositionInt(mNextSelectedPosition); |
| 1086 | |
| 1087 | // Pull all children into the RecycleBin. |
| 1088 | // These views will be reused if possible |
| 1089 | final int firstPosition = mFirstPosition; |
| 1090 | final RecycleBin recycleBin = mRecycler; |
| 1091 | |
| 1092 | if (dataChanged) { |
| 1093 | for (int i = 0; i < childCount; i++) { |
| 1094 | recycleBin.addScrapView(getChildAt(i)); |
| 1095 | } |
| 1096 | } else { |
| 1097 | recycleBin.fillActiveViews(childCount, firstPosition); |
| 1098 | } |
| 1099 | |
| 1100 | // Clear out old views |
| 1101 | //removeAllViewsInLayout(); |
| 1102 | detachAllViewsFromParent(); |
| 1103 | |
| 1104 | switch (mLayoutMode) { |
| 1105 | case LAYOUT_SET_SELECTION: |
| 1106 | if (newSel != null) { |
| 1107 | sel = fillFromSelection(newSel.getTop(), childrenTop, childrenBottom); |
| 1108 | } else { |
| 1109 | sel = fillSelection(childrenTop, childrenBottom); |
| 1110 | } |
| 1111 | break; |
| 1112 | case LAYOUT_FORCE_TOP: |
| 1113 | mFirstPosition = 0; |
| 1114 | sel = fillFromTop(childrenTop); |
| 1115 | adjustViewsUpOrDown(); |
| 1116 | break; |
| 1117 | case LAYOUT_FORCE_BOTTOM: |
| 1118 | sel = fillUp(mItemCount - 1, childrenBottom); |
| 1119 | adjustViewsUpOrDown(); |
| 1120 | break; |
| 1121 | case LAYOUT_SPECIFIC: |
| 1122 | sel = fillSpecific(mSelectedPosition, mSpecificTop); |
| 1123 | break; |
| 1124 | case LAYOUT_SYNC: |
| 1125 | sel = fillSpecific(mSyncPosition, mSpecificTop); |
| 1126 | break; |
| 1127 | case LAYOUT_MOVE_SELECTION: |
| 1128 | // Move the selection relative to its old position |
| 1129 | sel = moveSelection(delta, childrenTop, childrenBottom); |
| 1130 | break; |
| 1131 | default: |
| 1132 | if (childCount == 0) { |
| 1133 | if (!mStackFromBottom) { |
Romain Guy | 91c8613 | 2010-03-26 17:29:45 -0700 | [diff] [blame] | 1134 | setSelectedPositionInt(mAdapter == null || isInTouchMode() ? |
| 1135 | INVALID_POSITION : 0); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1136 | sel = fillFromTop(childrenTop); |
| 1137 | } else { |
| 1138 | final int last = mItemCount - 1; |
Romain Guy | 91c8613 | 2010-03-26 17:29:45 -0700 | [diff] [blame] | 1139 | setSelectedPositionInt(mAdapter == null || isInTouchMode() ? |
| 1140 | INVALID_POSITION : last); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1141 | sel = fillFromBottom(last, childrenBottom); |
| 1142 | } |
| 1143 | } else { |
| 1144 | if (mSelectedPosition >= 0 && mSelectedPosition < mItemCount) { |
| 1145 | sel = fillSpecific(mSelectedPosition, oldSel == null ? |
| 1146 | childrenTop : oldSel.getTop()); |
| 1147 | } else if (mFirstPosition < mItemCount) { |
| 1148 | sel = fillSpecific(mFirstPosition, oldFirst == null ? |
| 1149 | childrenTop : oldFirst.getTop()); |
| 1150 | } else { |
| 1151 | sel = fillSpecific(0, childrenTop); |
| 1152 | } |
| 1153 | } |
| 1154 | break; |
| 1155 | } |
| 1156 | |
| 1157 | // Flush any cached views that did not get reused above |
| 1158 | recycleBin.scrapActiveViews(); |
| 1159 | |
| 1160 | if (sel != null) { |
| 1161 | positionSelector(sel); |
| 1162 | mSelectedTop = sel.getTop(); |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1163 | } else if (mTouchMode > TOUCH_MODE_DOWN && mTouchMode < TOUCH_MODE_SCROLL) { |
| 1164 | View child = getChildAt(mMotionPosition - mFirstPosition); |
Romain Guy | b4c547a | 2009-09-28 13:42:20 -0700 | [diff] [blame] | 1165 | if (child != null) positionSelector(child); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1166 | } else { |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1167 | mSelectedTop = 0; |
| 1168 | mSelectorRect.setEmpty(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1169 | } |
| 1170 | |
| 1171 | mLayoutMode = LAYOUT_NORMAL; |
| 1172 | mDataChanged = false; |
| 1173 | mNeedSync = false; |
| 1174 | setNextSelectedPositionInt(mSelectedPosition); |
| 1175 | |
| 1176 | updateScrollIndicators(); |
| 1177 | |
| 1178 | if (mItemCount > 0) { |
| 1179 | checkSelectionChanged(); |
| 1180 | } |
| 1181 | |
| 1182 | invokeOnItemScrollListener(); |
| 1183 | } finally { |
| 1184 | if (!blockLayoutRequests) { |
| 1185 | mBlockLayoutRequests = false; |
| 1186 | } |
| 1187 | } |
| 1188 | } |
| 1189 | |
| 1190 | |
| 1191 | /** |
| 1192 | * Obtain the view and add it to our list of children. The view can be made |
| 1193 | * fresh, converted from an unused view, or used as is if it was in the |
| 1194 | * recycle bin. |
| 1195 | * |
| 1196 | * @param position Logical position in the list |
| 1197 | * @param y Top or bottom edge of the view to add |
| 1198 | * @param flow if true, align top edge to y. If false, align bottom edge to |
| 1199 | * y. |
| 1200 | * @param childrenLeft Left edge where children should be positioned |
| 1201 | * @param selected Is this position selected? |
| 1202 | * @param where to add new item in the list |
| 1203 | * @return View that was added |
| 1204 | */ |
| 1205 | private View makeAndAddView(int position, int y, boolean flow, int childrenLeft, |
| 1206 | boolean selected, int where) { |
| 1207 | View child; |
| 1208 | |
| 1209 | if (!mDataChanged) { |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1210 | // Try to use an existing view for this position |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1211 | child = mRecycler.getActiveView(position); |
| 1212 | if (child != null) { |
| 1213 | // Found it -- we're using an existing child |
| 1214 | // This just needs to be positioned |
| 1215 | setupChild(child, position, y, flow, childrenLeft, selected, true, where); |
| 1216 | return child; |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | // Make a new view for this position, or convert an unused view if |
| 1221 | // possible |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1222 | child = obtainView(position, mIsScrap); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1223 | |
| 1224 | // This needs to be positioned and measured |
Romain Guy | 2187505 | 2010-01-06 18:48:08 -0800 | [diff] [blame] | 1225 | 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] | 1226 | |
| 1227 | return child; |
| 1228 | } |
| 1229 | |
| 1230 | /** |
| 1231 | * Add a view as a child and make sure it is measured (if necessary) and |
| 1232 | * positioned properly. |
| 1233 | * |
| 1234 | * @param child The view to add |
| 1235 | * @param position The position of the view |
| 1236 | * @param y The y position relative to which this view will be positioned |
| 1237 | * @param flow if true, align top edge to y. If false, align bottom edge |
| 1238 | * to y. |
| 1239 | * @param childrenLeft Left edge where children should be positioned |
| 1240 | * @param selected Is this position selected? |
| 1241 | * @param recycled Has this view been pulled from the recycle bin? If so it |
| 1242 | * does not need to be remeasured. |
| 1243 | * @param where Where to add the item in the list |
| 1244 | * |
| 1245 | */ |
| 1246 | private void setupChild(View child, int position, int y, boolean flow, int childrenLeft, |
| 1247 | boolean selected, boolean recycled, int where) { |
| 1248 | boolean isSelected = selected && shouldShowSelector(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1249 | final boolean updateChildSelected = isSelected != child.isSelected(); |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1250 | final int mode = mTouchMode; |
| 1251 | final boolean isPressed = mode > TOUCH_MODE_DOWN && mode < TOUCH_MODE_SCROLL && |
| 1252 | mMotionPosition == position; |
| 1253 | final boolean updateChildPressed = isPressed != child.isPressed(); |
| 1254 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1255 | boolean needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested(); |
| 1256 | |
| 1257 | // Respect layout params that are already in the view. Otherwise make |
| 1258 | // some up... |
| 1259 | AbsListView.LayoutParams p = (AbsListView.LayoutParams)child.getLayoutParams(); |
| 1260 | if (p == null) { |
Romain Guy | 980a938 | 2010-01-08 15:06:28 -0800 | [diff] [blame] | 1261 | p = new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1262 | ViewGroup.LayoutParams.WRAP_CONTENT, 0); |
| 1263 | } |
| 1264 | p.viewType = mAdapter.getItemViewType(position); |
| 1265 | |
Romain Guy | 0bf8859 | 2010-03-02 13:38:44 -0800 | [diff] [blame] | 1266 | if (recycled && !p.forceAdd) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1267 | attachViewToParent(child, where, p); |
| 1268 | } else { |
Romain Guy | 0bf8859 | 2010-03-02 13:38:44 -0800 | [diff] [blame] | 1269 | p.forceAdd = false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1270 | addViewInLayout(child, where, p, true); |
| 1271 | } |
| 1272 | |
| 1273 | if (updateChildSelected) { |
| 1274 | child.setSelected(isSelected); |
| 1275 | if (isSelected) { |
| 1276 | requestFocus(); |
| 1277 | } |
| 1278 | } |
| 1279 | |
Romain Guy | 3616a41 | 2009-09-15 13:50:37 -0700 | [diff] [blame] | 1280 | if (updateChildPressed) { |
| 1281 | child.setPressed(isPressed); |
| 1282 | } |
| 1283 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1284 | if (needToMeasure) { |
| 1285 | int childHeightSpec = ViewGroup.getChildMeasureSpec( |
| 1286 | MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 0, p.height); |
| 1287 | |
| 1288 | int childWidthSpec = ViewGroup.getChildMeasureSpec( |
| 1289 | MeasureSpec.makeMeasureSpec(mColumnWidth, MeasureSpec.EXACTLY), 0, p.width); |
| 1290 | child.measure(childWidthSpec, childHeightSpec); |
| 1291 | } else { |
| 1292 | cleanupLayoutState(child); |
| 1293 | } |
| 1294 | |
| 1295 | final int w = child.getMeasuredWidth(); |
| 1296 | final int h = child.getMeasuredHeight(); |
| 1297 | |
| 1298 | int childLeft; |
| 1299 | final int childTop = flow ? y : y - h; |
| 1300 | |
| 1301 | switch (mGravity & Gravity.HORIZONTAL_GRAVITY_MASK) { |
| 1302 | case Gravity.LEFT: |
| 1303 | childLeft = childrenLeft; |
| 1304 | break; |
| 1305 | case Gravity.CENTER_HORIZONTAL: |
| 1306 | childLeft = childrenLeft + ((mColumnWidth - w) / 2); |
| 1307 | break; |
| 1308 | case Gravity.RIGHT: |
| 1309 | childLeft = childrenLeft + mColumnWidth - w; |
| 1310 | break; |
| 1311 | default: |
| 1312 | childLeft = childrenLeft; |
| 1313 | break; |
| 1314 | } |
| 1315 | |
| 1316 | if (needToMeasure) { |
| 1317 | final int childRight = childLeft + w; |
| 1318 | final int childBottom = childTop + h; |
| 1319 | child.layout(childLeft, childTop, childRight, childBottom); |
| 1320 | } else { |
| 1321 | child.offsetLeftAndRight(childLeft - child.getLeft()); |
| 1322 | child.offsetTopAndBottom(childTop - child.getTop()); |
| 1323 | } |
| 1324 | |
| 1325 | if (mCachingStarted) { |
| 1326 | child.setDrawingCacheEnabled(true); |
| 1327 | } |
| 1328 | } |
| 1329 | |
| 1330 | /** |
| 1331 | * Sets the currently selected item |
| 1332 | * |
| 1333 | * @param position Index (starting at 0) of the data item to be selected. |
| 1334 | * |
| 1335 | * If in touch mode, the item will not be selected but it will still be positioned |
| 1336 | * appropriately. |
| 1337 | */ |
| 1338 | @Override |
| 1339 | public void setSelection(int position) { |
| 1340 | if (!isInTouchMode()) { |
| 1341 | setNextSelectedPositionInt(position); |
| 1342 | } else { |
| 1343 | mResurrectToPosition = position; |
| 1344 | } |
| 1345 | mLayoutMode = LAYOUT_SET_SELECTION; |
| 1346 | requestLayout(); |
| 1347 | } |
| 1348 | |
| 1349 | /** |
| 1350 | * Makes the item at the supplied position selected. |
| 1351 | * |
| 1352 | * @param position the position of the new selection |
| 1353 | */ |
| 1354 | @Override |
| 1355 | void setSelectionInt(int position) { |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1356 | int previousSelectedPosition = mNextSelectedPosition; |
| 1357 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1358 | setNextSelectedPositionInt(position); |
| 1359 | layoutChildren(); |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1360 | |
| 1361 | final int next = mStackFromBottom ? mItemCount - 1 - mNextSelectedPosition : |
| 1362 | mNextSelectedPosition; |
| 1363 | final int previous = mStackFromBottom ? mItemCount - 1 |
| 1364 | - previousSelectedPosition : previousSelectedPosition; |
| 1365 | |
| 1366 | final int nextRow = next / mNumColumns; |
| 1367 | final int previousRow = previous / mNumColumns; |
| 1368 | |
| 1369 | if (nextRow != previousRow) { |
| 1370 | awakenScrollBars(); |
| 1371 | } |
| 1372 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1373 | } |
| 1374 | |
| 1375 | @Override |
| 1376 | public boolean onKeyDown(int keyCode, KeyEvent event) { |
| 1377 | return commonKey(keyCode, 1, event); |
| 1378 | } |
| 1379 | |
| 1380 | @Override |
| 1381 | public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { |
| 1382 | return commonKey(keyCode, repeatCount, event); |
| 1383 | } |
| 1384 | |
| 1385 | @Override |
| 1386 | public boolean onKeyUp(int keyCode, KeyEvent event) { |
| 1387 | return commonKey(keyCode, 1, event); |
| 1388 | } |
| 1389 | |
| 1390 | private boolean commonKey(int keyCode, int count, KeyEvent event) { |
| 1391 | if (mAdapter == null) { |
| 1392 | return false; |
| 1393 | } |
| 1394 | |
| 1395 | if (mDataChanged) { |
| 1396 | layoutChildren(); |
| 1397 | } |
| 1398 | |
| 1399 | boolean handled = false; |
| 1400 | int action = event.getAction(); |
| 1401 | |
| 1402 | if (action != KeyEvent.ACTION_UP) { |
| 1403 | if (mSelectedPosition < 0) { |
| 1404 | switch (keyCode) { |
| 1405 | case KeyEvent.KEYCODE_DPAD_UP: |
| 1406 | case KeyEvent.KEYCODE_DPAD_DOWN: |
| 1407 | case KeyEvent.KEYCODE_DPAD_LEFT: |
| 1408 | case KeyEvent.KEYCODE_DPAD_RIGHT: |
| 1409 | case KeyEvent.KEYCODE_DPAD_CENTER: |
| 1410 | case KeyEvent.KEYCODE_SPACE: |
| 1411 | case KeyEvent.KEYCODE_ENTER: |
| 1412 | resurrectSelection(); |
| 1413 | return true; |
| 1414 | } |
| 1415 | } |
| 1416 | |
| 1417 | switch (keyCode) { |
| 1418 | case KeyEvent.KEYCODE_DPAD_LEFT: |
| 1419 | handled = arrowScroll(FOCUS_LEFT); |
| 1420 | break; |
| 1421 | |
| 1422 | case KeyEvent.KEYCODE_DPAD_RIGHT: |
| 1423 | handled = arrowScroll(FOCUS_RIGHT); |
| 1424 | break; |
| 1425 | |
| 1426 | case KeyEvent.KEYCODE_DPAD_UP: |
| 1427 | if (!event.isAltPressed()) { |
| 1428 | handled = arrowScroll(FOCUS_UP); |
| 1429 | |
| 1430 | } else { |
| 1431 | handled = fullScroll(FOCUS_UP); |
| 1432 | } |
| 1433 | break; |
| 1434 | |
| 1435 | case KeyEvent.KEYCODE_DPAD_DOWN: |
| 1436 | if (!event.isAltPressed()) { |
| 1437 | handled = arrowScroll(FOCUS_DOWN); |
| 1438 | } else { |
| 1439 | handled = fullScroll(FOCUS_DOWN); |
| 1440 | } |
| 1441 | break; |
| 1442 | |
| 1443 | case KeyEvent.KEYCODE_DPAD_CENTER: |
| 1444 | case KeyEvent.KEYCODE_ENTER: { |
| 1445 | if (getChildCount() > 0 && event.getRepeatCount() == 0) { |
| 1446 | keyPressed(); |
| 1447 | } |
| 1448 | |
| 1449 | return true; |
| 1450 | } |
| 1451 | |
| 1452 | case KeyEvent.KEYCODE_SPACE: |
| 1453 | if (mPopup == null || !mPopup.isShowing()) { |
| 1454 | if (!event.isShiftPressed()) { |
| 1455 | handled = pageScroll(FOCUS_DOWN); |
| 1456 | } else { |
| 1457 | handled = pageScroll(FOCUS_UP); |
| 1458 | } |
| 1459 | } |
| 1460 | break; |
| 1461 | } |
| 1462 | } |
| 1463 | |
| 1464 | if (!handled) { |
| 1465 | handled = sendToTextFilter(keyCode, count, event); |
| 1466 | } |
| 1467 | |
| 1468 | if (handled) { |
| 1469 | return true; |
| 1470 | } else { |
| 1471 | switch (action) { |
| 1472 | case KeyEvent.ACTION_DOWN: |
| 1473 | return super.onKeyDown(keyCode, event); |
| 1474 | case KeyEvent.ACTION_UP: |
| 1475 | return super.onKeyUp(keyCode, event); |
| 1476 | case KeyEvent.ACTION_MULTIPLE: |
| 1477 | return super.onKeyMultiple(keyCode, count, event); |
| 1478 | default: |
| 1479 | return false; |
| 1480 | } |
| 1481 | } |
| 1482 | } |
| 1483 | |
| 1484 | /** |
| 1485 | * Scrolls up or down by the number of items currently present on screen. |
| 1486 | * |
| 1487 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 1488 | * @return whether selection was moved |
| 1489 | */ |
| 1490 | boolean pageScroll(int direction) { |
| 1491 | int nextPage = -1; |
| 1492 | |
| 1493 | if (direction == FOCUS_UP) { |
| 1494 | nextPage = Math.max(0, mSelectedPosition - getChildCount() - 1); |
| 1495 | } else if (direction == FOCUS_DOWN) { |
| 1496 | nextPage = Math.min(mItemCount - 1, mSelectedPosition + getChildCount() - 1); |
| 1497 | } |
| 1498 | |
| 1499 | if (nextPage >= 0) { |
| 1500 | setSelectionInt(nextPage); |
| 1501 | invokeOnItemScrollListener(); |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1502 | awakenScrollBars(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1503 | return true; |
| 1504 | } |
| 1505 | |
| 1506 | return false; |
| 1507 | } |
| 1508 | |
| 1509 | /** |
| 1510 | * Go to the last or first item if possible. |
| 1511 | * |
| 1512 | * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN}. |
| 1513 | * |
| 1514 | * @return Whether selection was moved. |
| 1515 | */ |
| 1516 | boolean fullScroll(int direction) { |
| 1517 | boolean moved = false; |
| 1518 | if (direction == FOCUS_UP) { |
| 1519 | mLayoutMode = LAYOUT_SET_SELECTION; |
| 1520 | setSelectionInt(0); |
| 1521 | invokeOnItemScrollListener(); |
| 1522 | moved = true; |
| 1523 | } else if (direction == FOCUS_DOWN) { |
| 1524 | mLayoutMode = LAYOUT_SET_SELECTION; |
| 1525 | setSelectionInt(mItemCount - 1); |
| 1526 | invokeOnItemScrollListener(); |
| 1527 | moved = true; |
| 1528 | } |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1529 | |
| 1530 | if (moved) { |
| 1531 | awakenScrollBars(); |
| 1532 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1533 | |
| 1534 | return moved; |
| 1535 | } |
| 1536 | |
| 1537 | /** |
| 1538 | * Scrolls to the next or previous item, horizontally or vertically. |
| 1539 | * |
| 1540 | * @param direction either {@link View#FOCUS_LEFT}, {@link View#FOCUS_RIGHT}, |
| 1541 | * {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} |
| 1542 | * |
| 1543 | * @return whether selection was moved |
| 1544 | */ |
| 1545 | boolean arrowScroll(int direction) { |
| 1546 | final int selectedPosition = mSelectedPosition; |
| 1547 | final int numColumns = mNumColumns; |
| 1548 | |
| 1549 | int startOfRowPos; |
| 1550 | int endOfRowPos; |
| 1551 | |
| 1552 | boolean moved = false; |
| 1553 | |
| 1554 | if (!mStackFromBottom) { |
| 1555 | startOfRowPos = (selectedPosition / numColumns) * numColumns; |
| 1556 | endOfRowPos = Math.min(startOfRowPos + numColumns - 1, mItemCount - 1); |
| 1557 | } else { |
| 1558 | final int invertedSelection = mItemCount - 1 - selectedPosition; |
| 1559 | endOfRowPos = mItemCount - 1 - (invertedSelection / numColumns) * numColumns; |
| 1560 | startOfRowPos = Math.max(0, endOfRowPos - numColumns + 1); |
| 1561 | } |
| 1562 | |
| 1563 | switch (direction) { |
| 1564 | case FOCUS_UP: |
| 1565 | if (startOfRowPos > 0) { |
| 1566 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
| 1567 | setSelectionInt(Math.max(0, selectedPosition - numColumns)); |
| 1568 | moved = true; |
| 1569 | } |
| 1570 | break; |
| 1571 | case FOCUS_DOWN: |
| 1572 | if (endOfRowPos < mItemCount - 1) { |
| 1573 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
| 1574 | setSelectionInt(Math.min(selectedPosition + numColumns, mItemCount - 1)); |
| 1575 | moved = true; |
| 1576 | } |
| 1577 | break; |
| 1578 | case FOCUS_LEFT: |
| 1579 | if (selectedPosition > startOfRowPos) { |
| 1580 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
Romain Guy | 51d154b | 2009-05-04 16:24:39 -0700 | [diff] [blame] | 1581 | setSelectionInt(Math.max(0, selectedPosition - 1)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1582 | moved = true; |
| 1583 | } |
| 1584 | break; |
| 1585 | case FOCUS_RIGHT: |
| 1586 | if (selectedPosition < endOfRowPos) { |
| 1587 | mLayoutMode = LAYOUT_MOVE_SELECTION; |
Romain Guy | 51d154b | 2009-05-04 16:24:39 -0700 | [diff] [blame] | 1588 | setSelectionInt(Math.min(selectedPosition + 1, mItemCount - 1)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1589 | moved = true; |
| 1590 | } |
| 1591 | break; |
| 1592 | } |
| 1593 | |
| 1594 | if (moved) { |
| 1595 | playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction)); |
| 1596 | invokeOnItemScrollListener(); |
| 1597 | } |
| 1598 | |
Mike Cleron | f116bf8 | 2009-09-27 19:14:12 -0700 | [diff] [blame] | 1599 | if (moved) { |
| 1600 | awakenScrollBars(); |
| 1601 | } |
| 1602 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1603 | return moved; |
| 1604 | } |
| 1605 | |
| 1606 | @Override |
| 1607 | protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { |
| 1608 | super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); |
| 1609 | |
| 1610 | int closestChildIndex = -1; |
| 1611 | if (gainFocus && previouslyFocusedRect != null) { |
| 1612 | previouslyFocusedRect.offset(mScrollX, mScrollY); |
| 1613 | |
| 1614 | // figure out which item should be selected based on previously |
| 1615 | // focused rect |
| 1616 | Rect otherRect = mTempRect; |
| 1617 | int minDistance = Integer.MAX_VALUE; |
| 1618 | final int childCount = getChildCount(); |
| 1619 | for (int i = 0; i < childCount; i++) { |
| 1620 | // only consider view's on appropriate edge of grid |
| 1621 | if (!isCandidateSelection(i, direction)) { |
| 1622 | continue; |
| 1623 | } |
| 1624 | |
| 1625 | final View other = getChildAt(i); |
| 1626 | other.getDrawingRect(otherRect); |
| 1627 | offsetDescendantRectToMyCoords(other, otherRect); |
| 1628 | int distance = getDistance(previouslyFocusedRect, otherRect, direction); |
| 1629 | |
| 1630 | if (distance < minDistance) { |
| 1631 | minDistance = distance; |
| 1632 | closestChildIndex = i; |
| 1633 | } |
| 1634 | } |
| 1635 | } |
| 1636 | |
| 1637 | if (closestChildIndex >= 0) { |
| 1638 | setSelection(closestChildIndex + mFirstPosition); |
| 1639 | } else { |
| 1640 | requestLayout(); |
| 1641 | } |
| 1642 | } |
| 1643 | |
| 1644 | /** |
| 1645 | * Is childIndex a candidate for next focus given the direction the focus |
| 1646 | * change is coming from? |
| 1647 | * @param childIndex The index to check. |
| 1648 | * @param direction The direction, one of |
| 1649 | * {FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT} |
| 1650 | * @return Whether childIndex is a candidate. |
| 1651 | */ |
| 1652 | private boolean isCandidateSelection(int childIndex, int direction) { |
| 1653 | final int count = getChildCount(); |
| 1654 | final int invertedIndex = count - 1 - childIndex; |
| 1655 | |
| 1656 | int rowStart; |
| 1657 | int rowEnd; |
| 1658 | |
| 1659 | if (!mStackFromBottom) { |
| 1660 | rowStart = childIndex - (childIndex % mNumColumns); |
| 1661 | rowEnd = Math.max(rowStart + mNumColumns - 1, count); |
| 1662 | } else { |
| 1663 | rowEnd = count - 1 - (invertedIndex - (invertedIndex % mNumColumns)); |
| 1664 | rowStart = Math.max(0, rowEnd - mNumColumns + 1); |
| 1665 | } |
| 1666 | |
| 1667 | switch (direction) { |
| 1668 | case View.FOCUS_RIGHT: |
| 1669 | // coming from left, selection is only valid if it is on left |
| 1670 | // edge |
| 1671 | return childIndex == rowStart; |
| 1672 | case View.FOCUS_DOWN: |
| 1673 | // coming from top; only valid if in top row |
| 1674 | return rowStart == 0; |
| 1675 | case View.FOCUS_LEFT: |
| 1676 | // coming from right, must be on right edge |
| 1677 | return childIndex == rowEnd; |
| 1678 | case View.FOCUS_UP: |
| 1679 | // coming from bottom, need to be in last row |
| 1680 | return rowEnd == count - 1; |
| 1681 | default: |
| 1682 | throw new IllegalArgumentException("direction must be one of " |
| 1683 | + "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT}."); |
| 1684 | } |
| 1685 | } |
| 1686 | |
| 1687 | /** |
| 1688 | * Describes how the child views are horizontally aligned. Defaults to Gravity.LEFT |
| 1689 | * |
| 1690 | * @param gravity the gravity to apply to this grid's children |
| 1691 | * |
| 1692 | * @attr ref android.R.styleable#GridView_gravity |
| 1693 | */ |
| 1694 | public void setGravity(int gravity) { |
| 1695 | if (mGravity != gravity) { |
| 1696 | mGravity = gravity; |
| 1697 | requestLayoutIfNecessary(); |
| 1698 | } |
| 1699 | } |
| 1700 | |
| 1701 | /** |
| 1702 | * Set the amount of horizontal (x) spacing to place between each item |
| 1703 | * in the grid. |
| 1704 | * |
| 1705 | * @param horizontalSpacing The amount of horizontal space between items, |
| 1706 | * in pixels. |
| 1707 | * |
| 1708 | * @attr ref android.R.styleable#GridView_horizontalSpacing |
| 1709 | */ |
| 1710 | public void setHorizontalSpacing(int horizontalSpacing) { |
| 1711 | if (horizontalSpacing != mRequestedHorizontalSpacing) { |
| 1712 | mRequestedHorizontalSpacing = horizontalSpacing; |
| 1713 | requestLayoutIfNecessary(); |
| 1714 | } |
| 1715 | } |
| 1716 | |
| 1717 | |
| 1718 | /** |
| 1719 | * Set the amount of vertical (y) spacing to place between each item |
| 1720 | * in the grid. |
| 1721 | * |
| 1722 | * @param verticalSpacing The amount of vertical space between items, |
| 1723 | * in pixels. |
| 1724 | * |
| 1725 | * @attr ref android.R.styleable#GridView_verticalSpacing |
| 1726 | */ |
| 1727 | public void setVerticalSpacing(int verticalSpacing) { |
| 1728 | if (verticalSpacing != mVerticalSpacing) { |
| 1729 | mVerticalSpacing = verticalSpacing; |
| 1730 | requestLayoutIfNecessary(); |
| 1731 | } |
| 1732 | } |
| 1733 | |
| 1734 | /** |
| 1735 | * Control how items are stretched to fill their space. |
| 1736 | * |
| 1737 | * @param stretchMode Either {@link #NO_STRETCH}, |
| 1738 | * {@link #STRETCH_SPACING}, {@link #STRETCH_SPACING_UNIFORM}, or {@link #STRETCH_COLUMN_WIDTH}. |
| 1739 | * |
| 1740 | * @attr ref android.R.styleable#GridView_stretchMode |
| 1741 | */ |
| 1742 | public void setStretchMode(int stretchMode) { |
| 1743 | if (stretchMode != mStretchMode) { |
| 1744 | mStretchMode = stretchMode; |
| 1745 | requestLayoutIfNecessary(); |
| 1746 | } |
| 1747 | } |
| 1748 | |
| 1749 | public int getStretchMode() { |
| 1750 | return mStretchMode; |
| 1751 | } |
| 1752 | |
| 1753 | /** |
| 1754 | * Set the width of columns in the grid. |
| 1755 | * |
| 1756 | * @param columnWidth The column width, in pixels. |
| 1757 | * |
| 1758 | * @attr ref android.R.styleable#GridView_columnWidth |
| 1759 | */ |
| 1760 | public void setColumnWidth(int columnWidth) { |
| 1761 | if (columnWidth != mRequestedColumnWidth) { |
| 1762 | mRequestedColumnWidth = columnWidth; |
| 1763 | requestLayoutIfNecessary(); |
| 1764 | } |
| 1765 | } |
| 1766 | |
| 1767 | /** |
| 1768 | * Set the number of columns in the grid |
| 1769 | * |
| 1770 | * @param numColumns The desired number of columns. |
| 1771 | * |
| 1772 | * @attr ref android.R.styleable#GridView_numColumns |
| 1773 | */ |
| 1774 | public void setNumColumns(int numColumns) { |
| 1775 | if (numColumns != mRequestedNumColumns) { |
| 1776 | mRequestedNumColumns = numColumns; |
| 1777 | requestLayoutIfNecessary(); |
| 1778 | } |
| 1779 | } |
| 1780 | |
| 1781 | /** |
| 1782 | * Make sure views are touching the top or bottom edge, as appropriate for |
| 1783 | * our gravity |
| 1784 | */ |
| 1785 | private void adjustViewsUpOrDown() { |
| 1786 | final int childCount = getChildCount(); |
| 1787 | |
| 1788 | if (childCount > 0) { |
| 1789 | int delta; |
| 1790 | View child; |
| 1791 | |
| 1792 | if (!mStackFromBottom) { |
| 1793 | // Uh-oh -- we came up short. Slide all views up to make them |
| 1794 | // align with the top |
| 1795 | child = getChildAt(0); |
| 1796 | delta = child.getTop() - mListPadding.top; |
| 1797 | if (mFirstPosition != 0) { |
| 1798 | // It's OK to have some space above the first item if it is |
| 1799 | // part of the vertical spacing |
| 1800 | delta -= mVerticalSpacing; |
| 1801 | } |
| 1802 | if (delta < 0) { |
| 1803 | // We only are looking to see if we are too low, not too high |
| 1804 | delta = 0; |
| 1805 | } |
| 1806 | } else { |
| 1807 | // we are too high, slide all views down to align with bottom |
| 1808 | child = getChildAt(childCount - 1); |
| 1809 | delta = child.getBottom() - (getHeight() - mListPadding.bottom); |
| 1810 | |
| 1811 | if (mFirstPosition + childCount < mItemCount) { |
| 1812 | // It's OK to have some space below the last item if it is |
| 1813 | // part of the vertical spacing |
| 1814 | delta += mVerticalSpacing; |
| 1815 | } |
| 1816 | |
| 1817 | if (delta > 0) { |
| 1818 | // We only are looking to see if we are too high, not too low |
| 1819 | delta = 0; |
| 1820 | } |
| 1821 | } |
| 1822 | |
| 1823 | if (delta != 0) { |
| 1824 | offsetChildrenTopAndBottom(-delta); |
| 1825 | } |
| 1826 | } |
| 1827 | } |
| 1828 | |
| 1829 | @Override |
| 1830 | protected int computeVerticalScrollExtent() { |
| 1831 | final int count = getChildCount(); |
| 1832 | if (count > 0) { |
| 1833 | final int numColumns = mNumColumns; |
| 1834 | final int rowCount = (count + numColumns - 1) / numColumns; |
| 1835 | |
| 1836 | int extent = rowCount * 100; |
| 1837 | |
| 1838 | View view = getChildAt(0); |
| 1839 | final int top = view.getTop(); |
| 1840 | int height = view.getHeight(); |
| 1841 | if (height > 0) { |
| 1842 | extent += (top * 100) / height; |
| 1843 | } |
| 1844 | |
| 1845 | view = getChildAt(count - 1); |
| 1846 | final int bottom = view.getBottom(); |
| 1847 | height = view.getHeight(); |
| 1848 | if (height > 0) { |
| 1849 | extent -= ((bottom - getHeight()) * 100) / height; |
| 1850 | } |
| 1851 | |
| 1852 | return extent; |
| 1853 | } |
| 1854 | return 0; |
| 1855 | } |
| 1856 | |
| 1857 | @Override |
| 1858 | protected int computeVerticalScrollOffset() { |
| 1859 | if (mFirstPosition >= 0 && getChildCount() > 0) { |
| 1860 | final View view = getChildAt(0); |
| 1861 | final int top = view.getTop(); |
| 1862 | int height = view.getHeight(); |
| 1863 | if (height > 0) { |
Adam Powell | f2a204e | 2010-02-12 15:25:33 -0800 | [diff] [blame] | 1864 | final int numColumns = mNumColumns; |
| 1865 | final int whichRow = mFirstPosition / numColumns; |
| 1866 | final int rowCount = (mItemCount + numColumns - 1) / numColumns; |
| 1867 | return Math.max(whichRow * 100 - (top * 100) / height + |
| 1868 | (int) ((float) mScrollY / getHeight() * rowCount * 100), 0); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1869 | } |
| 1870 | } |
| 1871 | return 0; |
| 1872 | } |
| 1873 | |
| 1874 | @Override |
| 1875 | protected int computeVerticalScrollRange() { |
| 1876 | // TODO: Account for vertical spacing too |
| 1877 | final int numColumns = mNumColumns; |
| 1878 | final int rowCount = (mItemCount + numColumns - 1) / numColumns; |
Adam Powell | 0a77ce2 | 2010-08-25 14:37:03 -0700 | [diff] [blame] | 1879 | int result = Math.max(rowCount * 100, 0); |
| 1880 | if (mScrollY != 0) { |
| 1881 | // Compensate for overscroll |
| 1882 | result += Math.abs((int) ((float) mScrollY / getHeight() * rowCount * 100)); |
| 1883 | } |
| 1884 | return result; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1885 | } |
| 1886 | } |
| 1887 | |