The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.widget; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.database.DataSetObserver; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 21 | import android.os.Parcelable; |
| 22 | import android.os.SystemClock; |
| 23 | import android.util.AttributeSet; |
| 24 | import android.util.SparseArray; |
| 25 | import android.view.ContextMenu; |
Svetoslav Ganov | 8c6c79f | 2011-07-29 20:14:09 -0700 | [diff] [blame] | 26 | import android.view.ContextMenu.ContextMenuInfo; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 27 | import android.view.SoundEffectConstants; |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 28 | import android.view.View; |
| 29 | import android.view.ViewDebug; |
| 30 | import android.view.ViewGroup; |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 31 | import android.view.accessibility.AccessibilityEvent; |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 32 | import android.view.accessibility.AccessibilityManager; |
Svetoslav Ganov | d9ee72f | 2011-10-05 22:26:05 -0700 | [diff] [blame] | 33 | import android.view.accessibility.AccessibilityNodeInfo; |
Svetoslav Ganov | e5dfa47d | 2012-05-08 15:58:32 -0700 | [diff] [blame] | 34 | import android.view.accessibility.AccessibilityNodeProvider; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 35 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 36 | /** |
| 37 | * An AdapterView is a view whose children are determined by an {@link Adapter}. |
| 38 | * |
| 39 | * <p> |
| 40 | * See {@link ListView}, {@link GridView}, {@link Spinner} and |
| 41 | * {@link Gallery} for commonly used subclasses of AdapterView. |
Joe Fernandez | 61fd1e8 | 2011-10-26 13:39:11 -0700 | [diff] [blame] | 42 | * |
| 43 | * <div class="special reference"> |
| 44 | * <h3>Developer Guides</h3> |
| 45 | * <p>For more information about using AdapterView, read the |
| 46 | * <a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> |
| 47 | * developer guide.</p></div> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 48 | */ |
| 49 | public abstract class AdapterView<T extends Adapter> extends ViewGroup { |
| 50 | |
| 51 | /** |
| 52 | * The item view type returned by {@link Adapter#getItemViewType(int)} when |
| 53 | * the adapter does not want the item's view recycled. |
| 54 | */ |
| 55 | public static final int ITEM_VIEW_TYPE_IGNORE = -1; |
| 56 | |
| 57 | /** |
| 58 | * The item view type returned by {@link Adapter#getItemViewType(int)} when |
| 59 | * the item is a header or footer. |
| 60 | */ |
| 61 | public static final int ITEM_VIEW_TYPE_HEADER_OR_FOOTER = -2; |
| 62 | |
| 63 | /** |
| 64 | * The position of the first child displayed |
| 65 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 66 | @ViewDebug.ExportedProperty(category = "scrolling") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 67 | int mFirstPosition = 0; |
| 68 | |
| 69 | /** |
| 70 | * The offset in pixels from the top of the AdapterView to the top |
| 71 | * of the view to select during the next layout. |
| 72 | */ |
| 73 | int mSpecificTop; |
| 74 | |
| 75 | /** |
| 76 | * Position from which to start looking for mSyncRowId |
| 77 | */ |
| 78 | int mSyncPosition; |
| 79 | |
| 80 | /** |
| 81 | * Row id to look for when data has changed |
| 82 | */ |
| 83 | long mSyncRowId = INVALID_ROW_ID; |
| 84 | |
| 85 | /** |
| 86 | * Height of the view when mSyncPosition and mSyncRowId where set |
| 87 | */ |
| 88 | long mSyncHeight; |
| 89 | |
| 90 | /** |
| 91 | * True if we need to sync to mSyncRowId |
| 92 | */ |
| 93 | boolean mNeedSync = false; |
| 94 | |
| 95 | /** |
| 96 | * Indicates whether to sync based on the selection or position. Possible |
| 97 | * values are {@link #SYNC_SELECTED_POSITION} or |
| 98 | * {@link #SYNC_FIRST_POSITION}. |
| 99 | */ |
| 100 | int mSyncMode; |
| 101 | |
| 102 | /** |
| 103 | * Our height after the last layout |
| 104 | */ |
| 105 | private int mLayoutHeight; |
| 106 | |
| 107 | /** |
| 108 | * Sync based on the selected child |
| 109 | */ |
| 110 | static final int SYNC_SELECTED_POSITION = 0; |
| 111 | |
| 112 | /** |
| 113 | * Sync based on the first child displayed |
| 114 | */ |
| 115 | static final int SYNC_FIRST_POSITION = 1; |
| 116 | |
| 117 | /** |
| 118 | * Maximum amount of time to spend in {@link #findSyncPosition()} |
| 119 | */ |
| 120 | static final int SYNC_MAX_DURATION_MILLIS = 100; |
| 121 | |
| 122 | /** |
| 123 | * Indicates that this view is currently being laid out. |
| 124 | */ |
| 125 | boolean mInLayout = false; |
| 126 | |
| 127 | /** |
| 128 | * The listener that receives notifications when an item is selected. |
| 129 | */ |
| 130 | OnItemSelectedListener mOnItemSelectedListener; |
| 131 | |
| 132 | /** |
| 133 | * The listener that receives notifications when an item is clicked. |
| 134 | */ |
| 135 | OnItemClickListener mOnItemClickListener; |
| 136 | |
| 137 | /** |
| 138 | * The listener that receives notifications when an item is long clicked. |
| 139 | */ |
| 140 | OnItemLongClickListener mOnItemLongClickListener; |
| 141 | |
| 142 | /** |
| 143 | * True if the data has changed since the last layout |
| 144 | */ |
| 145 | boolean mDataChanged; |
| 146 | |
| 147 | /** |
| 148 | * The position within the adapter's data set of the item to select |
| 149 | * during the next layout. |
| 150 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 151 | @ViewDebug.ExportedProperty(category = "list") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 152 | int mNextSelectedPosition = INVALID_POSITION; |
| 153 | |
| 154 | /** |
| 155 | * The item id of the item to select during the next layout. |
| 156 | */ |
| 157 | long mNextSelectedRowId = INVALID_ROW_ID; |
| 158 | |
| 159 | /** |
| 160 | * The position within the adapter's data set of the currently selected item. |
| 161 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 162 | @ViewDebug.ExportedProperty(category = "list") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 163 | int mSelectedPosition = INVALID_POSITION; |
| 164 | |
| 165 | /** |
| 166 | * The item id of the currently selected item. |
| 167 | */ |
| 168 | long mSelectedRowId = INVALID_ROW_ID; |
| 169 | |
| 170 | /** |
| 171 | * View to show if there are no items to show. |
| 172 | */ |
Mihai Preda | b6af533 | 2009-04-28 14:21:57 +0200 | [diff] [blame] | 173 | private View mEmptyView; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 174 | |
| 175 | /** |
| 176 | * The number of items in the current adapter. |
| 177 | */ |
Konstantin Lopyrev | bea9516 | 2010-08-10 17:02:18 -0700 | [diff] [blame] | 178 | @ViewDebug.ExportedProperty(category = "list") |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 179 | int mItemCount; |
| 180 | |
| 181 | /** |
Chet Haase | 5e25c2c | 2010-09-16 11:15:56 -0700 | [diff] [blame] | 182 | * The number of items in the adapter before a data changed event occurred. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 183 | */ |
| 184 | int mOldItemCount; |
| 185 | |
| 186 | /** |
| 187 | * Represents an invalid position. All valid positions are in the range 0 to 1 less than the |
| 188 | * number of items in the current adapter. |
| 189 | */ |
| 190 | public static final int INVALID_POSITION = -1; |
| 191 | |
| 192 | /** |
| 193 | * Represents an empty or invalid row id |
| 194 | */ |
| 195 | public static final long INVALID_ROW_ID = Long.MIN_VALUE; |
| 196 | |
| 197 | /** |
| 198 | * The last selected position we used when notifying |
| 199 | */ |
| 200 | int mOldSelectedPosition = INVALID_POSITION; |
| 201 | |
| 202 | /** |
| 203 | * The id of the last selected position we used when notifying |
| 204 | */ |
| 205 | long mOldSelectedRowId = INVALID_ROW_ID; |
| 206 | |
| 207 | /** |
| 208 | * Indicates what focusable state is requested when calling setFocusable(). |
| 209 | * In addition to this, this view has other criteria for actually |
| 210 | * determining the focusable state (such as whether its empty or the text |
| 211 | * filter is shown). |
| 212 | * |
| 213 | * @see #setFocusable(boolean) |
| 214 | * @see #checkFocus() |
| 215 | */ |
| 216 | private boolean mDesiredFocusableState; |
| 217 | private boolean mDesiredFocusableInTouchModeState; |
| 218 | |
| 219 | private SelectionNotifier mSelectionNotifier; |
| 220 | /** |
| 221 | * When set to true, calls to requestLayout() will not propagate up the parent hierarchy. |
| 222 | * This is used to layout the children during a layout pass. |
| 223 | */ |
| 224 | boolean mBlockLayoutRequests = false; |
| 225 | |
| 226 | public AdapterView(Context context) { |
| 227 | super(context); |
| 228 | } |
| 229 | |
| 230 | public AdapterView(Context context, AttributeSet attrs) { |
| 231 | super(context, attrs); |
| 232 | } |
| 233 | |
| 234 | public AdapterView(Context context, AttributeSet attrs, int defStyle) { |
| 235 | super(context, attrs, defStyle); |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 236 | |
| 237 | // If not explicitly specified this view is important for accessibility. |
| 238 | if (getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { |
| 239 | setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); |
| 240 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 241 | } |
| 242 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 243 | /** |
| 244 | * Interface definition for a callback to be invoked when an item in this |
| 245 | * AdapterView has been clicked. |
| 246 | */ |
| 247 | public interface OnItemClickListener { |
| 248 | |
| 249 | /** |
| 250 | * Callback method to be invoked when an item in this AdapterView has |
| 251 | * been clicked. |
| 252 | * <p> |
| 253 | * Implementers can call getItemAtPosition(position) if they need |
| 254 | * to access the data associated with the selected item. |
| 255 | * |
| 256 | * @param parent The AdapterView where the click happened. |
| 257 | * @param view The view within the AdapterView that was clicked (this |
| 258 | * will be a view provided by the adapter) |
| 259 | * @param position The position of the view in the adapter. |
| 260 | * @param id The row id of the item that was clicked. |
| 261 | */ |
| 262 | void onItemClick(AdapterView<?> parent, View view, int position, long id); |
| 263 | } |
| 264 | |
| 265 | /** |
| 266 | * Register a callback to be invoked when an item in this AdapterView has |
| 267 | * been clicked. |
| 268 | * |
| 269 | * @param listener The callback that will be invoked. |
| 270 | */ |
| 271 | public void setOnItemClickListener(OnItemClickListener listener) { |
| 272 | mOnItemClickListener = listener; |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * @return The callback to be invoked with an item in this AdapterView has |
| 277 | * been clicked, or null id no callback has been set. |
| 278 | */ |
| 279 | public final OnItemClickListener getOnItemClickListener() { |
| 280 | return mOnItemClickListener; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Call the OnItemClickListener, if it is defined. |
| 285 | * |
| 286 | * @param view The view within the AdapterView that was clicked. |
| 287 | * @param position The position of the view in the adapter. |
| 288 | * @param id The row id of the item that was clicked. |
| 289 | * @return True if there was an assigned OnItemClickListener that was |
| 290 | * called, false otherwise is returned. |
| 291 | */ |
| 292 | public boolean performItemClick(View view, int position, long id) { |
| 293 | if (mOnItemClickListener != null) { |
| 294 | playSoundEffect(SoundEffectConstants.CLICK); |
Adam Powell | cbff417 | 2011-09-18 17:48:35 -0700 | [diff] [blame] | 295 | if (view != null) { |
| 296 | view.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); |
| 297 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 298 | mOnItemClickListener.onItemClick(this, view, position, id); |
| 299 | return true; |
| 300 | } |
| 301 | |
| 302 | return false; |
| 303 | } |
| 304 | |
| 305 | /** |
| 306 | * Interface definition for a callback to be invoked when an item in this |
| 307 | * view has been clicked and held. |
| 308 | */ |
| 309 | public interface OnItemLongClickListener { |
| 310 | /** |
| 311 | * Callback method to be invoked when an item in this view has been |
| 312 | * clicked and held. |
| 313 | * |
| 314 | * Implementers can call getItemAtPosition(position) if they need to access |
| 315 | * the data associated with the selected item. |
| 316 | * |
| 317 | * @param parent The AbsListView where the click happened |
| 318 | * @param view The view within the AbsListView that was clicked |
| 319 | * @param position The position of the view in the list |
| 320 | * @param id The row id of the item that was clicked |
| 321 | * |
| 322 | * @return true if the callback consumed the long click, false otherwise |
| 323 | */ |
| 324 | boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id); |
| 325 | } |
| 326 | |
| 327 | |
| 328 | /** |
| 329 | * Register a callback to be invoked when an item in this AdapterView has |
| 330 | * been clicked and held |
| 331 | * |
| 332 | * @param listener The callback that will run |
| 333 | */ |
| 334 | public void setOnItemLongClickListener(OnItemLongClickListener listener) { |
| 335 | if (!isLongClickable()) { |
| 336 | setLongClickable(true); |
| 337 | } |
| 338 | mOnItemLongClickListener = listener; |
| 339 | } |
| 340 | |
| 341 | /** |
| 342 | * @return The callback to be invoked with an item in this AdapterView has |
| 343 | * been clicked and held, or null id no callback as been set. |
| 344 | */ |
| 345 | public final OnItemLongClickListener getOnItemLongClickListener() { |
| 346 | return mOnItemLongClickListener; |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * Interface definition for a callback to be invoked when |
| 351 | * an item in this view has been selected. |
| 352 | */ |
| 353 | public interface OnItemSelectedListener { |
| 354 | /** |
Romain Guy | f18c8dd | 2011-09-16 16:16:36 -0700 | [diff] [blame] | 355 | * <p>Callback method to be invoked when an item in this view has been |
| 356 | * selected. This callback is invoked only when the newly selected |
| 357 | * position is different from the previously selected position or if |
| 358 | * there was no selected item.</p> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 359 | * |
| 360 | * Impelmenters can call getItemAtPosition(position) if they need to access the |
| 361 | * data associated with the selected item. |
| 362 | * |
| 363 | * @param parent The AdapterView where the selection happened |
| 364 | * @param view The view within the AdapterView that was clicked |
| 365 | * @param position The position of the view in the adapter |
| 366 | * @param id The row id of the item that is selected |
| 367 | */ |
| 368 | void onItemSelected(AdapterView<?> parent, View view, int position, long id); |
| 369 | |
| 370 | /** |
| 371 | * Callback method to be invoked when the selection disappears from this |
| 372 | * view. The selection can disappear for instance when touch is activated |
| 373 | * or when the adapter becomes empty. |
| 374 | * |
| 375 | * @param parent The AdapterView that now contains no selected item. |
| 376 | */ |
| 377 | void onNothingSelected(AdapterView<?> parent); |
| 378 | } |
| 379 | |
| 380 | |
| 381 | /** |
| 382 | * Register a callback to be invoked when an item in this AdapterView has |
| 383 | * been selected. |
| 384 | * |
| 385 | * @param listener The callback that will run |
| 386 | */ |
| 387 | public void setOnItemSelectedListener(OnItemSelectedListener listener) { |
| 388 | mOnItemSelectedListener = listener; |
| 389 | } |
| 390 | |
| 391 | public final OnItemSelectedListener getOnItemSelectedListener() { |
| 392 | return mOnItemSelectedListener; |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * Extra menu information provided to the |
| 397 | * {@link android.view.View.OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo) } |
| 398 | * callback when a context menu is brought up for this AdapterView. |
| 399 | * |
| 400 | */ |
| 401 | public static class AdapterContextMenuInfo implements ContextMenu.ContextMenuInfo { |
| 402 | |
| 403 | public AdapterContextMenuInfo(View targetView, int position, long id) { |
| 404 | this.targetView = targetView; |
| 405 | this.position = position; |
| 406 | this.id = id; |
| 407 | } |
| 408 | |
| 409 | /** |
| 410 | * The child view for which the context menu is being displayed. This |
| 411 | * will be one of the children of this AdapterView. |
| 412 | */ |
| 413 | public View targetView; |
| 414 | |
| 415 | /** |
| 416 | * The position in the adapter for which the context menu is being |
| 417 | * displayed. |
| 418 | */ |
| 419 | public int position; |
| 420 | |
| 421 | /** |
| 422 | * The row id of the item for which the context menu is being displayed. |
| 423 | */ |
| 424 | public long id; |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * Returns the adapter currently associated with this widget. |
| 429 | * |
| 430 | * @return The adapter used to provide this view's content. |
| 431 | */ |
| 432 | public abstract T getAdapter(); |
| 433 | |
| 434 | /** |
| 435 | * Sets the adapter that provides the data and the views to represent the data |
| 436 | * in this widget. |
| 437 | * |
| 438 | * @param adapter The adapter to use to create this view's content. |
| 439 | */ |
| 440 | public abstract void setAdapter(T adapter); |
| 441 | |
| 442 | /** |
| 443 | * This method is not supported and throws an UnsupportedOperationException when called. |
| 444 | * |
| 445 | * @param child Ignored. |
| 446 | * |
| 447 | * @throws UnsupportedOperationException Every time this method is invoked. |
| 448 | */ |
| 449 | @Override |
| 450 | public void addView(View child) { |
| 451 | throw new UnsupportedOperationException("addView(View) is not supported in AdapterView"); |
| 452 | } |
| 453 | |
| 454 | /** |
| 455 | * This method is not supported and throws an UnsupportedOperationException when called. |
| 456 | * |
| 457 | * @param child Ignored. |
| 458 | * @param index Ignored. |
| 459 | * |
| 460 | * @throws UnsupportedOperationException Every time this method is invoked. |
| 461 | */ |
| 462 | @Override |
| 463 | public void addView(View child, int index) { |
| 464 | throw new UnsupportedOperationException("addView(View, int) is not supported in AdapterView"); |
| 465 | } |
| 466 | |
| 467 | /** |
| 468 | * This method is not supported and throws an UnsupportedOperationException when called. |
| 469 | * |
| 470 | * @param child Ignored. |
| 471 | * @param params Ignored. |
| 472 | * |
| 473 | * @throws UnsupportedOperationException Every time this method is invoked. |
| 474 | */ |
| 475 | @Override |
| 476 | public void addView(View child, LayoutParams params) { |
| 477 | throw new UnsupportedOperationException("addView(View, LayoutParams) " |
| 478 | + "is not supported in AdapterView"); |
| 479 | } |
| 480 | |
| 481 | /** |
| 482 | * This method is not supported and throws an UnsupportedOperationException when called. |
| 483 | * |
| 484 | * @param child Ignored. |
| 485 | * @param index Ignored. |
| 486 | * @param params Ignored. |
| 487 | * |
| 488 | * @throws UnsupportedOperationException Every time this method is invoked. |
| 489 | */ |
| 490 | @Override |
| 491 | public void addView(View child, int index, LayoutParams params) { |
| 492 | throw new UnsupportedOperationException("addView(View, int, LayoutParams) " |
| 493 | + "is not supported in AdapterView"); |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * This method is not supported and throws an UnsupportedOperationException when called. |
| 498 | * |
| 499 | * @param child Ignored. |
| 500 | * |
| 501 | * @throws UnsupportedOperationException Every time this method is invoked. |
| 502 | */ |
| 503 | @Override |
| 504 | public void removeView(View child) { |
| 505 | throw new UnsupportedOperationException("removeView(View) is not supported in AdapterView"); |
| 506 | } |
| 507 | |
| 508 | /** |
| 509 | * This method is not supported and throws an UnsupportedOperationException when called. |
| 510 | * |
| 511 | * @param index Ignored. |
| 512 | * |
| 513 | * @throws UnsupportedOperationException Every time this method is invoked. |
| 514 | */ |
| 515 | @Override |
| 516 | public void removeViewAt(int index) { |
| 517 | throw new UnsupportedOperationException("removeViewAt(int) is not supported in AdapterView"); |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * This method is not supported and throws an UnsupportedOperationException when called. |
| 522 | * |
| 523 | * @throws UnsupportedOperationException Every time this method is invoked. |
| 524 | */ |
| 525 | @Override |
| 526 | public void removeAllViews() { |
| 527 | throw new UnsupportedOperationException("removeAllViews() is not supported in AdapterView"); |
| 528 | } |
| 529 | |
| 530 | @Override |
| 531 | protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
| 532 | mLayoutHeight = getHeight(); |
| 533 | } |
| 534 | |
| 535 | /** |
| 536 | * Return the position of the currently selected item within the adapter's data set |
| 537 | * |
| 538 | * @return int Position (starting at 0), or {@link #INVALID_POSITION} if there is nothing selected. |
| 539 | */ |
| 540 | @ViewDebug.CapturedViewProperty |
| 541 | public int getSelectedItemPosition() { |
| 542 | return mNextSelectedPosition; |
| 543 | } |
| 544 | |
| 545 | /** |
| 546 | * @return The id corresponding to the currently selected item, or {@link #INVALID_ROW_ID} |
| 547 | * if nothing is selected. |
| 548 | */ |
| 549 | @ViewDebug.CapturedViewProperty |
| 550 | public long getSelectedItemId() { |
| 551 | return mNextSelectedRowId; |
| 552 | } |
| 553 | |
| 554 | /** |
| 555 | * @return The view corresponding to the currently selected item, or null |
| 556 | * if nothing is selected |
| 557 | */ |
| 558 | public abstract View getSelectedView(); |
| 559 | |
| 560 | /** |
| 561 | * @return The data corresponding to the currently selected item, or |
| 562 | * null if there is nothing selected. |
| 563 | */ |
| 564 | public Object getSelectedItem() { |
| 565 | T adapter = getAdapter(); |
| 566 | int selection = getSelectedItemPosition(); |
| 567 | if (adapter != null && adapter.getCount() > 0 && selection >= 0) { |
| 568 | return adapter.getItem(selection); |
| 569 | } else { |
| 570 | return null; |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | /** |
| 575 | * @return The number of items owned by the Adapter associated with this |
| 576 | * AdapterView. (This is the number of data items, which may be |
Chet Haase | 5e25c2c | 2010-09-16 11:15:56 -0700 | [diff] [blame] | 577 | * larger than the number of visible views.) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 578 | */ |
| 579 | @ViewDebug.CapturedViewProperty |
| 580 | public int getCount() { |
| 581 | return mItemCount; |
| 582 | } |
| 583 | |
| 584 | /** |
| 585 | * Get the position within the adapter's data set for the view, where view is a an adapter item |
| 586 | * or a descendant of an adapter item. |
| 587 | * |
| 588 | * @param view an adapter item, or a descendant of an adapter item. This must be visible in this |
| 589 | * AdapterView at the time of the call. |
| 590 | * @return the position within the adapter's data set of the view, or {@link #INVALID_POSITION} |
| 591 | * if the view does not correspond to a list item (or it is not currently visible). |
| 592 | */ |
| 593 | public int getPositionForView(View view) { |
| 594 | View listItem = view; |
| 595 | try { |
| 596 | View v; |
| 597 | while (!(v = (View) listItem.getParent()).equals(this)) { |
| 598 | listItem = v; |
| 599 | } |
| 600 | } catch (ClassCastException e) { |
| 601 | // We made it up to the window without find this list view |
| 602 | return INVALID_POSITION; |
| 603 | } |
| 604 | |
| 605 | // Search the children for the list item |
| 606 | final int childCount = getChildCount(); |
| 607 | for (int i = 0; i < childCount; i++) { |
| 608 | if (getChildAt(i).equals(listItem)) { |
| 609 | return mFirstPosition + i; |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | // Child not found! |
| 614 | return INVALID_POSITION; |
| 615 | } |
| 616 | |
| 617 | /** |
| 618 | * Returns the position within the adapter's data set for the first item |
| 619 | * displayed on screen. |
| 620 | * |
| 621 | * @return The position within the adapter's data set |
| 622 | */ |
| 623 | public int getFirstVisiblePosition() { |
| 624 | return mFirstPosition; |
| 625 | } |
| 626 | |
| 627 | /** |
| 628 | * Returns the position within the adapter's data set for the last item |
| 629 | * displayed on screen. |
| 630 | * |
| 631 | * @return The position within the adapter's data set |
| 632 | */ |
| 633 | public int getLastVisiblePosition() { |
| 634 | return mFirstPosition + getChildCount() - 1; |
| 635 | } |
| 636 | |
| 637 | /** |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 638 | * Sets the currently selected item. To support accessibility subclasses that |
| 639 | * override this method must invoke the overriden super method first. |
| 640 | * |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 641 | * @param position Index (starting at 0) of the data item to be selected. |
| 642 | */ |
| 643 | public abstract void setSelection(int position); |
| 644 | |
| 645 | /** |
| 646 | * Sets the view to show if the adapter is empty |
| 647 | */ |
Adam Cohen | 1480fdd | 2010-08-25 17:24:53 -0700 | [diff] [blame] | 648 | @android.view.RemotableViewMethod |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 649 | public void setEmptyView(View emptyView) { |
| 650 | mEmptyView = emptyView; |
| 651 | |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 652 | // If not explicitly specified this view is important for accessibility. |
Mindy Pereira | f937313 | 2012-04-16 08:58:53 -0700 | [diff] [blame] | 653 | if (emptyView != null |
| 654 | && emptyView.getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 655 | emptyView.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); |
| 656 | } |
| 657 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 658 | final T adapter = getAdapter(); |
| 659 | final boolean empty = ((adapter == null) || adapter.isEmpty()); |
| 660 | updateEmptyStatus(empty); |
| 661 | } |
| 662 | |
| 663 | /** |
| 664 | * When the current adapter is empty, the AdapterView can display a special view |
| 665 | * call the empty view. The empty view is used to provide feedback to the user |
| 666 | * that no data is available in this AdapterView. |
| 667 | * |
| 668 | * @return The view to show if the adapter is empty. |
| 669 | */ |
| 670 | public View getEmptyView() { |
| 671 | return mEmptyView; |
| 672 | } |
| 673 | |
| 674 | /** |
| 675 | * Indicates whether this view is in filter mode. Filter mode can for instance |
| 676 | * be enabled by a user when typing on the keyboard. |
| 677 | * |
| 678 | * @return True if the view is in filter mode, false otherwise. |
| 679 | */ |
| 680 | boolean isInFilterMode() { |
| 681 | return false; |
| 682 | } |
| 683 | |
| 684 | @Override |
| 685 | public void setFocusable(boolean focusable) { |
| 686 | final T adapter = getAdapter(); |
| 687 | final boolean empty = adapter == null || adapter.getCount() == 0; |
| 688 | |
| 689 | mDesiredFocusableState = focusable; |
| 690 | if (!focusable) { |
| 691 | mDesiredFocusableInTouchModeState = false; |
| 692 | } |
| 693 | |
| 694 | super.setFocusable(focusable && (!empty || isInFilterMode())); |
| 695 | } |
| 696 | |
| 697 | @Override |
| 698 | public void setFocusableInTouchMode(boolean focusable) { |
| 699 | final T adapter = getAdapter(); |
| 700 | final boolean empty = adapter == null || adapter.getCount() == 0; |
| 701 | |
| 702 | mDesiredFocusableInTouchModeState = focusable; |
| 703 | if (focusable) { |
| 704 | mDesiredFocusableState = true; |
| 705 | } |
| 706 | |
| 707 | super.setFocusableInTouchMode(focusable && (!empty || isInFilterMode())); |
| 708 | } |
| 709 | |
| 710 | void checkFocus() { |
| 711 | final T adapter = getAdapter(); |
| 712 | final boolean empty = adapter == null || adapter.getCount() == 0; |
| 713 | final boolean focusable = !empty || isInFilterMode(); |
| 714 | // The order in which we set focusable in touch mode/focusable may matter |
| 715 | // for the client, see View.setFocusableInTouchMode() comments for more |
| 716 | // details |
| 717 | super.setFocusableInTouchMode(focusable && mDesiredFocusableInTouchModeState); |
| 718 | super.setFocusable(focusable && mDesiredFocusableState); |
| 719 | if (mEmptyView != null) { |
| 720 | updateEmptyStatus((adapter == null) || adapter.isEmpty()); |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | /** |
| 725 | * Update the status of the list based on the empty parameter. If empty is true and |
| 726 | * we have an empty view, display it. In all the other cases, make sure that the listview |
| 727 | * is VISIBLE and that the empty view is GONE (if it's not null). |
| 728 | */ |
| 729 | private void updateEmptyStatus(boolean empty) { |
| 730 | if (isInFilterMode()) { |
| 731 | empty = false; |
| 732 | } |
| 733 | |
| 734 | if (empty) { |
| 735 | if (mEmptyView != null) { |
| 736 | mEmptyView.setVisibility(View.VISIBLE); |
| 737 | setVisibility(View.GONE); |
| 738 | } else { |
| 739 | // If the caller just removed our empty view, make sure the list view is visible |
| 740 | setVisibility(View.VISIBLE); |
| 741 | } |
| 742 | |
| 743 | // We are now GONE, so pending layouts will not be dispatched. |
| 744 | // Force one here to make sure that the state of the list matches |
| 745 | // the state of the adapter. |
| 746 | if (mDataChanged) { |
| 747 | this.onLayout(false, mLeft, mTop, mRight, mBottom); |
| 748 | } |
| 749 | } else { |
| 750 | if (mEmptyView != null) mEmptyView.setVisibility(View.GONE); |
| 751 | setVisibility(View.VISIBLE); |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | /** |
| 756 | * Gets the data associated with the specified position in the list. |
| 757 | * |
| 758 | * @param position Which data to get |
| 759 | * @return The data associated with the specified position in the list |
| 760 | */ |
| 761 | public Object getItemAtPosition(int position) { |
| 762 | T adapter = getAdapter(); |
| 763 | return (adapter == null || position < 0) ? null : adapter.getItem(position); |
| 764 | } |
| 765 | |
| 766 | public long getItemIdAtPosition(int position) { |
| 767 | T adapter = getAdapter(); |
| 768 | return (adapter == null || position < 0) ? INVALID_ROW_ID : adapter.getItemId(position); |
| 769 | } |
| 770 | |
| 771 | @Override |
| 772 | public void setOnClickListener(OnClickListener l) { |
| 773 | throw new RuntimeException("Don't call setOnClickListener for an AdapterView. " |
| 774 | + "You probably want setOnItemClickListener instead"); |
| 775 | } |
| 776 | |
| 777 | /** |
| 778 | * Override to prevent freezing of any views created by the adapter. |
| 779 | */ |
| 780 | @Override |
| 781 | protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { |
| 782 | dispatchFreezeSelfOnly(container); |
| 783 | } |
| 784 | |
| 785 | /** |
| 786 | * Override to prevent thawing of any views created by the adapter. |
| 787 | */ |
| 788 | @Override |
| 789 | protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { |
| 790 | dispatchThawSelfOnly(container); |
| 791 | } |
| 792 | |
| 793 | class AdapterDataSetObserver extends DataSetObserver { |
| 794 | |
| 795 | private Parcelable mInstanceState = null; |
| 796 | |
| 797 | @Override |
| 798 | public void onChanged() { |
| 799 | mDataChanged = true; |
| 800 | mOldItemCount = mItemCount; |
| 801 | mItemCount = getAdapter().getCount(); |
| 802 | |
| 803 | // Detect the case where a cursor that was previously invalidated has |
| 804 | // been repopulated with new data. |
| 805 | if (AdapterView.this.getAdapter().hasStableIds() && mInstanceState != null |
| 806 | && mOldItemCount == 0 && mItemCount > 0) { |
| 807 | AdapterView.this.onRestoreInstanceState(mInstanceState); |
| 808 | mInstanceState = null; |
| 809 | } else { |
| 810 | rememberSyncState(); |
| 811 | } |
| 812 | checkFocus(); |
| 813 | requestLayout(); |
| 814 | } |
| 815 | |
| 816 | @Override |
| 817 | public void onInvalidated() { |
| 818 | mDataChanged = true; |
| 819 | |
| 820 | if (AdapterView.this.getAdapter().hasStableIds()) { |
| 821 | // Remember the current state for the case where our hosting activity is being |
| 822 | // stopped and later restarted |
| 823 | mInstanceState = AdapterView.this.onSaveInstanceState(); |
| 824 | } |
| 825 | |
| 826 | // Data is invalid so we should reset our state |
| 827 | mOldItemCount = mItemCount; |
| 828 | mItemCount = 0; |
| 829 | mSelectedPosition = INVALID_POSITION; |
| 830 | mSelectedRowId = INVALID_ROW_ID; |
| 831 | mNextSelectedPosition = INVALID_POSITION; |
| 832 | mNextSelectedRowId = INVALID_ROW_ID; |
| 833 | mNeedSync = false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 834 | |
| 835 | checkFocus(); |
| 836 | requestLayout(); |
| 837 | } |
| 838 | |
| 839 | public void clearSavedState() { |
| 840 | mInstanceState = null; |
| 841 | } |
| 842 | } |
| 843 | |
Adam Powell | 9c17a4c1 | 2010-08-30 18:04:15 -0700 | [diff] [blame] | 844 | @Override |
| 845 | protected void onDetachedFromWindow() { |
| 846 | super.onDetachedFromWindow(); |
| 847 | removeCallbacks(mSelectionNotifier); |
| 848 | } |
| 849 | |
| 850 | private class SelectionNotifier implements Runnable { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 851 | public void run() { |
| 852 | if (mDataChanged) { |
| 853 | // Data has changed between when this SelectionNotifier |
| 854 | // was posted and now. We need to wait until the AdapterView |
| 855 | // has been synched to the new data. |
Adam Powell | 9c17a4c1 | 2010-08-30 18:04:15 -0700 | [diff] [blame] | 856 | if (getAdapter() != null) { |
| 857 | post(this); |
| 858 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 859 | } else { |
| 860 | fireOnSelected(); |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 861 | performAccessibilityActionsOnSelected(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 862 | } |
| 863 | } |
| 864 | } |
| 865 | |
| 866 | void selectionChanged() { |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 867 | if (mOnItemSelectedListener != null |
| 868 | || AccessibilityManager.getInstance(mContext).isEnabled()) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 869 | if (mInLayout || mBlockLayoutRequests) { |
| 870 | // If we are in a layout traversal, defer notification |
| 871 | // by posting. This ensures that the view tree is |
| 872 | // in a consistent state and is able to accomodate |
| 873 | // new layout or invalidate requests. |
| 874 | if (mSelectionNotifier == null) { |
| 875 | mSelectionNotifier = new SelectionNotifier(); |
| 876 | } |
Adam Powell | 9c17a4c1 | 2010-08-30 18:04:15 -0700 | [diff] [blame] | 877 | post(mSelectionNotifier); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 878 | } else { |
| 879 | fireOnSelected(); |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 880 | performAccessibilityActionsOnSelected(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 881 | } |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | private void fireOnSelected() { |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 886 | if (mOnItemSelectedListener == null) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 887 | return; |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 888 | } |
| 889 | final int selection = getSelectedItemPosition(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 890 | if (selection >= 0) { |
| 891 | View v = getSelectedView(); |
| 892 | mOnItemSelectedListener.onItemSelected(this, v, selection, |
| 893 | getAdapter().getItemId(selection)); |
| 894 | } else { |
| 895 | mOnItemSelectedListener.onNothingSelected(this); |
| 896 | } |
| 897 | } |
| 898 | |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 899 | private void performAccessibilityActionsOnSelected() { |
| 900 | if (!AccessibilityManager.getInstance(mContext).isEnabled()) { |
| 901 | return; |
| 902 | } |
| 903 | final int position = getSelectedItemPosition(); |
| 904 | if (position >= 0) { |
| 905 | // we fire selection events here not in View |
| 906 | sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED); |
| 907 | } |
| 908 | } |
| 909 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 910 | @Override |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 911 | public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { |
Svetoslav Ganov | 0b0a41d | 2011-09-07 18:06:03 -0700 | [diff] [blame] | 912 | View selectedView = getSelectedView(); |
Svetoslav Ganov | d9ee72f | 2011-10-05 22:26:05 -0700 | [diff] [blame] | 913 | if (selectedView != null && selectedView.getVisibility() == VISIBLE |
| 914 | && selectedView.dispatchPopulateAccessibilityEvent(event)) { |
| 915 | return true; |
Svetoslav Ganov | 0b0a41d | 2011-09-07 18:06:03 -0700 | [diff] [blame] | 916 | } |
Svetoslav Ganov | bad9d97 | 2011-05-27 16:37:55 -0700 | [diff] [blame] | 917 | return false; |
| 918 | } |
| 919 | |
| 920 | @Override |
Svetoslav Ganov | bad9d97 | 2011-05-27 16:37:55 -0700 | [diff] [blame] | 921 | public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { |
Svetoslav Ganov | 6179ea3 | 2011-06-28 01:12:41 -0700 | [diff] [blame] | 922 | if (super.onRequestSendAccessibilityEvent(child, event)) { |
| 923 | // Add a record for ourselves as well. |
| 924 | AccessibilityEvent record = AccessibilityEvent.obtain(); |
| 925 | onInitializeAccessibilityEvent(record); |
| 926 | // Populate with the text of the requesting child. |
| 927 | child.dispatchPopulateAccessibilityEvent(record); |
| 928 | event.appendRecord(record); |
| 929 | return true; |
| 930 | } |
| 931 | return false; |
Svetoslav Ganov | 736c275 | 2011-04-22 18:30:36 -0700 | [diff] [blame] | 932 | } |
Adam Powell | 3fb3d7c | 2011-04-22 17:08:55 -0700 | [diff] [blame] | 933 | |
Svetoslav Ganov | 736c275 | 2011-04-22 18:30:36 -0700 | [diff] [blame] | 934 | @Override |
Svetoslav Ganov | d9ee72f | 2011-10-05 22:26:05 -0700 | [diff] [blame] | 935 | public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { |
| 936 | super.onInitializeAccessibilityNodeInfo(info); |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 937 | info.setClassName(AdapterView.class.getName()); |
Svetoslav Ganov | d9ee72f | 2011-10-05 22:26:05 -0700 | [diff] [blame] | 938 | info.setScrollable(isScrollableForAccessibility()); |
| 939 | View selectedView = getSelectedView(); |
| 940 | if (selectedView != null) { |
| 941 | info.setEnabled(selectedView.isEnabled()); |
| 942 | } |
| 943 | } |
| 944 | |
| 945 | @Override |
Svetoslav Ganov | 3040132 | 2011-05-12 18:53:45 -0700 | [diff] [blame] | 946 | public void onInitializeAccessibilityEvent(AccessibilityEvent event) { |
| 947 | super.onInitializeAccessibilityEvent(event); |
Svetoslav Ganov | 8a78fd4 | 2012-01-17 14:36:46 -0800 | [diff] [blame] | 948 | event.setClassName(AdapterView.class.getName()); |
Svetoslav Ganov | d9ee72f | 2011-10-05 22:26:05 -0700 | [diff] [blame] | 949 | event.setScrollable(isScrollableForAccessibility()); |
Svetoslav Ganov | 736c275 | 2011-04-22 18:30:36 -0700 | [diff] [blame] | 950 | View selectedView = getSelectedView(); |
| 951 | if (selectedView != null) { |
| 952 | event.setEnabled(selectedView.isEnabled()); |
| 953 | } |
Svetoslav Ganov | eb0c52e | 2011-10-10 18:15:41 -0700 | [diff] [blame] | 954 | event.setCurrentItemIndex(getSelectedItemPosition()); |
Svetoslav Ganov | d9ee72f | 2011-10-05 22:26:05 -0700 | [diff] [blame] | 955 | event.setFromIndex(getFirstVisiblePosition()); |
| 956 | event.setToIndex(getLastVisiblePosition()); |
Svetoslav Ganov | 0e6fa8b | 2011-10-19 12:38:04 -0700 | [diff] [blame] | 957 | event.setItemCount(getCount()); |
Svetoslav Ganov | d9ee72f | 2011-10-05 22:26:05 -0700 | [diff] [blame] | 958 | } |
| 959 | |
| 960 | private boolean isScrollableForAccessibility() { |
Svetoslav Ganov | 9834851 | 2011-10-10 17:18:19 -0700 | [diff] [blame] | 961 | T adapter = getAdapter(); |
| 962 | if (adapter != null) { |
| 963 | final int itemCount = adapter.getCount(); |
| 964 | return itemCount > 0 |
| 965 | && (getFirstVisiblePosition() > 0 || getLastVisiblePosition() < itemCount - 1); |
| 966 | } |
| 967 | return false; |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 968 | } |
| 969 | |
| 970 | @Override |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 971 | protected boolean canAnimate() { |
| 972 | return super.canAnimate() && mItemCount > 0; |
| 973 | } |
| 974 | |
| 975 | void handleDataChanged() { |
| 976 | final int count = mItemCount; |
| 977 | boolean found = false; |
| 978 | |
| 979 | if (count > 0) { |
| 980 | |
| 981 | int newPos; |
| 982 | |
| 983 | // Find the row we are supposed to sync to |
| 984 | if (mNeedSync) { |
| 985 | // Update this first, since setNextSelectedPositionInt inspects |
| 986 | // it |
| 987 | mNeedSync = false; |
| 988 | |
| 989 | // See if we can find a position in the new data with the same |
| 990 | // id as the old selection |
| 991 | newPos = findSyncPosition(); |
| 992 | if (newPos >= 0) { |
| 993 | // Verify that new selection is selectable |
| 994 | int selectablePos = lookForSelectablePosition(newPos, true); |
| 995 | if (selectablePos == newPos) { |
| 996 | // Same row id is selected |
| 997 | setNextSelectedPositionInt(newPos); |
| 998 | found = true; |
| 999 | } |
| 1000 | } |
| 1001 | } |
| 1002 | if (!found) { |
| 1003 | // Try to use the same position if we can't find matching data |
| 1004 | newPos = getSelectedItemPosition(); |
| 1005 | |
| 1006 | // Pin position to the available range |
| 1007 | if (newPos >= count) { |
| 1008 | newPos = count - 1; |
| 1009 | } |
| 1010 | if (newPos < 0) { |
| 1011 | newPos = 0; |
| 1012 | } |
| 1013 | |
| 1014 | // Make sure we select something selectable -- first look down |
| 1015 | int selectablePos = lookForSelectablePosition(newPos, true); |
| 1016 | if (selectablePos < 0) { |
| 1017 | // Looking down didn't work -- try looking up |
| 1018 | selectablePos = lookForSelectablePosition(newPos, false); |
| 1019 | } |
| 1020 | if (selectablePos >= 0) { |
| 1021 | setNextSelectedPositionInt(selectablePos); |
| 1022 | checkSelectionChanged(); |
| 1023 | found = true; |
| 1024 | } |
| 1025 | } |
| 1026 | } |
| 1027 | if (!found) { |
| 1028 | // Nothing is selected |
| 1029 | mSelectedPosition = INVALID_POSITION; |
| 1030 | mSelectedRowId = INVALID_ROW_ID; |
| 1031 | mNextSelectedPosition = INVALID_POSITION; |
| 1032 | mNextSelectedRowId = INVALID_ROW_ID; |
| 1033 | mNeedSync = false; |
| 1034 | checkSelectionChanged(); |
| 1035 | } |
Svetoslav Ganov | 4213804 | 2012-03-20 11:51:39 -0700 | [diff] [blame] | 1036 | |
| 1037 | //TODO: Hmm, we do not know the old state so this is sub-optimal |
| 1038 | notifyAccessibilityStateChanged(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | void checkSelectionChanged() { |
| 1042 | if ((mSelectedPosition != mOldSelectedPosition) || (mSelectedRowId != mOldSelectedRowId)) { |
| 1043 | selectionChanged(); |
| 1044 | mOldSelectedPosition = mSelectedPosition; |
| 1045 | mOldSelectedRowId = mSelectedRowId; |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | /** |
| 1050 | * Searches the adapter for a position matching mSyncRowId. The search starts at mSyncPosition |
| 1051 | * and then alternates between moving up and moving down until 1) we find the right position, or |
| 1052 | * 2) we run out of time, or 3) we have looked at every position |
| 1053 | * |
| 1054 | * @return Position of the row that matches mSyncRowId, or {@link #INVALID_POSITION} if it can't |
| 1055 | * be found |
| 1056 | */ |
| 1057 | int findSyncPosition() { |
| 1058 | int count = mItemCount; |
| 1059 | |
| 1060 | if (count == 0) { |
| 1061 | return INVALID_POSITION; |
| 1062 | } |
| 1063 | |
| 1064 | long idToMatch = mSyncRowId; |
| 1065 | int seed = mSyncPosition; |
| 1066 | |
| 1067 | // If there isn't a selection don't hunt for it |
| 1068 | if (idToMatch == INVALID_ROW_ID) { |
| 1069 | return INVALID_POSITION; |
| 1070 | } |
| 1071 | |
| 1072 | // Pin seed to reasonable values |
| 1073 | seed = Math.max(0, seed); |
| 1074 | seed = Math.min(count - 1, seed); |
| 1075 | |
| 1076 | long endTime = SystemClock.uptimeMillis() + SYNC_MAX_DURATION_MILLIS; |
| 1077 | |
| 1078 | long rowId; |
| 1079 | |
| 1080 | // first position scanned so far |
| 1081 | int first = seed; |
| 1082 | |
| 1083 | // last position scanned so far |
| 1084 | int last = seed; |
| 1085 | |
| 1086 | // True if we should move down on the next iteration |
| 1087 | boolean next = false; |
| 1088 | |
| 1089 | // True when we have looked at the first item in the data |
| 1090 | boolean hitFirst; |
| 1091 | |
| 1092 | // True when we have looked at the last item in the data |
| 1093 | boolean hitLast; |
| 1094 | |
| 1095 | // Get the item ID locally (instead of getItemIdAtPosition), so |
| 1096 | // we need the adapter |
| 1097 | T adapter = getAdapter(); |
| 1098 | if (adapter == null) { |
| 1099 | return INVALID_POSITION; |
| 1100 | } |
| 1101 | |
| 1102 | while (SystemClock.uptimeMillis() <= endTime) { |
| 1103 | rowId = adapter.getItemId(seed); |
| 1104 | if (rowId == idToMatch) { |
| 1105 | // Found it! |
| 1106 | return seed; |
| 1107 | } |
| 1108 | |
| 1109 | hitLast = last == count - 1; |
| 1110 | hitFirst = first == 0; |
| 1111 | |
| 1112 | if (hitLast && hitFirst) { |
| 1113 | // Looked at everything |
| 1114 | break; |
| 1115 | } |
| 1116 | |
| 1117 | if (hitFirst || (next && !hitLast)) { |
| 1118 | // Either we hit the top, or we are trying to move down |
| 1119 | last++; |
| 1120 | seed = last; |
| 1121 | // Try going up next time |
| 1122 | next = false; |
| 1123 | } else if (hitLast || (!next && !hitFirst)) { |
| 1124 | // Either we hit the bottom, or we are trying to move up |
| 1125 | first--; |
| 1126 | seed = first; |
| 1127 | // Try going down next time |
| 1128 | next = true; |
| 1129 | } |
| 1130 | |
| 1131 | } |
| 1132 | |
| 1133 | return INVALID_POSITION; |
| 1134 | } |
| 1135 | |
| 1136 | /** |
| 1137 | * Find a position that can be selected (i.e., is not a separator). |
| 1138 | * |
| 1139 | * @param position The starting position to look at. |
| 1140 | * @param lookDown Whether to look down for other positions. |
| 1141 | * @return The next selectable position starting at position and then searching either up or |
| 1142 | * down. Returns {@link #INVALID_POSITION} if nothing can be found. |
| 1143 | */ |
| 1144 | int lookForSelectablePosition(int position, boolean lookDown) { |
| 1145 | return position; |
| 1146 | } |
| 1147 | |
| 1148 | /** |
| 1149 | * Utility to keep mSelectedPosition and mSelectedRowId in sync |
| 1150 | * @param position Our current position |
| 1151 | */ |
| 1152 | void setSelectedPositionInt(int position) { |
| 1153 | mSelectedPosition = position; |
| 1154 | mSelectedRowId = getItemIdAtPosition(position); |
| 1155 | } |
| 1156 | |
| 1157 | /** |
| 1158 | * Utility to keep mNextSelectedPosition and mNextSelectedRowId in sync |
| 1159 | * @param position Intended value for mSelectedPosition the next time we go |
| 1160 | * through layout |
| 1161 | */ |
| 1162 | void setNextSelectedPositionInt(int position) { |
| 1163 | mNextSelectedPosition = position; |
| 1164 | mNextSelectedRowId = getItemIdAtPosition(position); |
| 1165 | // If we are trying to sync to the selection, update that too |
| 1166 | if (mNeedSync && mSyncMode == SYNC_SELECTED_POSITION && position >= 0) { |
| 1167 | mSyncPosition = position; |
| 1168 | mSyncRowId = mNextSelectedRowId; |
| 1169 | } |
| 1170 | } |
| 1171 | |
| 1172 | /** |
| 1173 | * Remember enough information to restore the screen state when the data has |
| 1174 | * changed. |
| 1175 | * |
| 1176 | */ |
| 1177 | void rememberSyncState() { |
| 1178 | if (getChildCount() > 0) { |
| 1179 | mNeedSync = true; |
| 1180 | mSyncHeight = mLayoutHeight; |
| 1181 | if (mSelectedPosition >= 0) { |
| 1182 | // Sync the selection state |
| 1183 | View v = getChildAt(mSelectedPosition - mFirstPosition); |
| 1184 | mSyncRowId = mNextSelectedRowId; |
| 1185 | mSyncPosition = mNextSelectedPosition; |
| 1186 | if (v != null) { |
| 1187 | mSpecificTop = v.getTop(); |
| 1188 | } |
| 1189 | mSyncMode = SYNC_SELECTED_POSITION; |
| 1190 | } else { |
| 1191 | // Sync the based on the offset of the first view |
| 1192 | View v = getChildAt(0); |
| 1193 | T adapter = getAdapter(); |
| 1194 | if (mFirstPosition >= 0 && mFirstPosition < adapter.getCount()) { |
| 1195 | mSyncRowId = adapter.getItemId(mFirstPosition); |
| 1196 | } else { |
| 1197 | mSyncRowId = NO_ID; |
| 1198 | } |
| 1199 | mSyncPosition = mFirstPosition; |
| 1200 | if (v != null) { |
| 1201 | mSpecificTop = v.getTop(); |
| 1202 | } |
| 1203 | mSyncMode = SYNC_FIRST_POSITION; |
| 1204 | } |
| 1205 | } |
| 1206 | } |
| 1207 | } |