TaskStackView.java revision f7bca430d9356c26d6df222d2c90bc7668262f6b
1/* 2 * Copyright (C) 2014 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 17package com.android.systemui.recents.views; 18 19import android.animation.Animator; 20import android.animation.AnimatorListenerAdapter; 21import android.animation.AnimatorSet; 22import android.animation.ObjectAnimator; 23import android.animation.ValueAnimator; 24import android.app.Activity; 25import android.content.Context; 26import android.graphics.Canvas; 27import android.graphics.Rect; 28import android.graphics.Region; 29import android.util.Pair; 30import android.view.LayoutInflater; 31import android.view.MotionEvent; 32import android.view.VelocityTracker; 33import android.view.View; 34import android.view.ViewConfiguration; 35import android.view.ViewParent; 36import android.widget.FrameLayout; 37import android.widget.OverScroller; 38import com.android.systemui.R; 39import com.android.systemui.recents.BakedBezierInterpolator; 40import com.android.systemui.recents.Console; 41import com.android.systemui.recents.Constants; 42import com.android.systemui.recents.RecentsConfiguration; 43import com.android.systemui.recents.RecentsTaskLoader; 44import com.android.systemui.recents.Utilities; 45import com.android.systemui.recents.model.Task; 46import com.android.systemui.recents.model.TaskStack; 47 48import java.util.ArrayList; 49import java.util.HashMap; 50 51 52/* The visual representation of a task stack view */ 53public class TaskStackView extends FrameLayout implements TaskStack.TaskStackCallbacks, 54 TaskView.TaskViewCallbacks, ViewPool.ViewPoolConsumer<TaskView, Task>, 55 View.OnClickListener, View.OnLongClickListener { 56 57 /** The TaskView callbacks */ 58 interface TaskStackViewCallbacks { 59 public void onTaskLaunched(TaskStackView stackView, TaskView tv, TaskStack stack, Task t); 60 public void onTaskAppInfoLaunched(Task t); 61 } 62 63 TaskStack mStack; 64 TaskStackViewTouchHandler mTouchHandler; 65 TaskStackViewCallbacks mCb; 66 ViewPool<TaskView, Task> mViewPool; 67 68 // The various rects that define the stack view 69 Rect mRect = new Rect(); 70 Rect mStackRect = new Rect(); 71 Rect mStackRectSansPeek = new Rect(); 72 Rect mTaskRect = new Rect(); 73 74 // The virtual stack scroll that we use for the card layout 75 int mStackScroll; 76 int mMinScroll; 77 int mMaxScroll; 78 int mStashedScroll; 79 int mLastInfoPaneStackScroll; 80 OverScroller mScroller; 81 ObjectAnimator mScrollAnimator; 82 83 // Optimizations 84 int mHwLayersRefCount; 85 int mStackViewsAnimationDuration; 86 boolean mStackViewsDirty = true; 87 boolean mAwaitingFirstLayout = true; 88 int[] mTmpVisibleRange = new int[2]; 89 Rect mTmpRect = new Rect(); 90 Rect mTmpRect2 = new Rect(); 91 LayoutInflater mInflater; 92 93 public TaskStackView(Context context, TaskStack stack) { 94 super(context); 95 mStack = stack; 96 mStack.setCallbacks(this); 97 mScroller = new OverScroller(context); 98 mTouchHandler = new TaskStackViewTouchHandler(context, this); 99 mViewPool = new ViewPool<TaskView, Task>(context, this); 100 mInflater = LayoutInflater.from(context); 101 } 102 103 /** Sets the callbacks */ 104 void setCallbacks(TaskStackViewCallbacks cb) { 105 mCb = cb; 106 } 107 108 /** Requests that the views be synchronized with the model */ 109 void requestSynchronizeStackViewsWithModel() { 110 requestSynchronizeStackViewsWithModel(0); 111 } 112 void requestSynchronizeStackViewsWithModel(int duration) { 113 Console.log(Constants.DebugFlags.TaskStack.SynchronizeViewsWithModel, 114 "[TaskStackView|requestSynchronize]", "" + duration + "ms", Console.AnsiYellow); 115 if (!mStackViewsDirty) { 116 invalidate(); 117 } 118 if (mAwaitingFirstLayout) { 119 // Skip the animation if we are awaiting first layout 120 mStackViewsAnimationDuration = 0; 121 } else { 122 mStackViewsAnimationDuration = Math.max(mStackViewsAnimationDuration, duration); 123 } 124 mStackViewsDirty = true; 125 } 126 127 // XXX: Optimization: Use a mapping of Task -> View 128 private TaskView getChildViewForTask(Task t) { 129 int childCount = getChildCount(); 130 for (int i = 0; i < childCount; i++) { 131 TaskView tv = (TaskView) getChildAt(i); 132 if (tv.getTask() == t) { 133 return tv; 134 } 135 } 136 return null; 137 } 138 139 /** Update/get the transform */ 140 public TaskViewTransform getStackTransform(int indexInStack, int stackScroll) { 141 TaskViewTransform transform = new TaskViewTransform(); 142 143 // Return early if we have an invalid index 144 if (indexInStack < 0) return transform; 145 146 // Map the items to an continuous position relative to the specified scroll 147 int numPeekCards = Constants.Values.TaskStackView.StackPeekNumCards; 148 float overlapHeight = Constants.Values.TaskStackView.StackOverlapPct * mTaskRect.height(); 149 float peekHeight = Constants.Values.TaskStackView.StackPeekHeightPct * mStackRect.height(); 150 float t = ((indexInStack * overlapHeight) - stackScroll) / overlapHeight; 151 float boundedT = Math.max(t, -(numPeekCards + 1)); 152 153 // Set the scale relative to its position 154 float minScale = Constants.Values.TaskStackView.StackPeekMinScale; 155 float scaleRange = 1f - minScale; 156 float scaleInc = scaleRange / numPeekCards; 157 float scale = Math.max(minScale, Math.min(1f, 1f + (boundedT * scaleInc))); 158 float scaleYOffset = ((1f - scale) * mTaskRect.height()) / 2; 159 transform.scale = scale; 160 161 // Set the translation 162 if (boundedT < 0f) { 163 transform.translationY = (int) ((Math.max(-numPeekCards, boundedT) / 164 numPeekCards) * peekHeight - scaleYOffset); 165 } else { 166 transform.translationY = (int) (boundedT * overlapHeight - scaleYOffset); 167 } 168 169 // Update the rect and visibility 170 transform.rect.set(mTaskRect); 171 if (t < -(numPeekCards + 1)) { 172 transform.visible = false; 173 } else { 174 transform.rect.offset(0, transform.translationY); 175 Utilities.scaleRectAboutCenter(transform.rect, transform.scale); 176 transform.visible = Rect.intersects(mRect, transform.rect); 177 } 178 transform.t = t; 179 return transform; 180 } 181 182 /** 183 * Gets the stack transforms of a list of tasks, and returns the visible range of tasks. 184 */ 185 private ArrayList<TaskViewTransform> getStackTransforms(ArrayList<Task> tasks, 186 int stackScroll, 187 int[] visibleRangeOut, 188 boolean boundTranslationsToRect) { 189 // XXX: Optimization: Use binary search to find the visible range 190 191 ArrayList<TaskViewTransform> taskTransforms = new ArrayList<TaskViewTransform>(); 192 int taskCount = tasks.size(); 193 int firstVisibleIndex = -1; 194 int lastVisibleIndex = -1; 195 for (int i = 0; i < taskCount; i++) { 196 TaskViewTransform transform = getStackTransform(i, stackScroll); 197 taskTransforms.add(transform); 198 if (transform.visible) { 199 if (firstVisibleIndex < 0) { 200 firstVisibleIndex = i; 201 } 202 lastVisibleIndex = i; 203 } 204 205 if (boundTranslationsToRect) { 206 transform.translationY = Math.min(transform.translationY, mRect.bottom); 207 } 208 } 209 if (visibleRangeOut != null) { 210 visibleRangeOut[0] = firstVisibleIndex; 211 visibleRangeOut[1] = lastVisibleIndex; 212 } 213 return taskTransforms; 214 } 215 216 /** Synchronizes the views with the model */ 217 void synchronizeStackViewsWithModel() { 218 Console.log(Constants.DebugFlags.TaskStack.SynchronizeViewsWithModel, 219 "[TaskStackView|synchronizeViewsWithModel]", 220 "mStackViewsDirty: " + mStackViewsDirty, Console.AnsiYellow); 221 if (mStackViewsDirty) { 222 // XXX: Consider using TaskViewTransform pool to prevent allocations 223 // XXX: Iterate children views, update transforms and remove all that are not visible 224 // For all remaining tasks, update transforms and if visible add the view 225 226 // Get all the task transforms 227 int[] visibleRange = mTmpVisibleRange; 228 int stackScroll = getStackScroll(); 229 ArrayList<Task> tasks = mStack.getTasks(); 230 ArrayList<TaskViewTransform> taskTransforms = getStackTransforms(tasks, stackScroll, 231 visibleRange, false); 232 233 // Update the visible state of all the tasks 234 int taskCount = tasks.size(); 235 for (int i = 0; i < taskCount; i++) { 236 Task task = tasks.get(i); 237 TaskViewTransform transform = taskTransforms.get(i); 238 TaskView tv = getChildViewForTask(task); 239 240 if (transform.visible) { 241 if (tv == null) { 242 tv = mViewPool.pickUpViewFromPool(task, task); 243 // When we are picking up a new view from the view pool, prepare it for any 244 // following animation by putting it in a reasonable place 245 if (mStackViewsAnimationDuration > 0 && i != 0) { 246 int fromIndex = (transform.t < 0) ? (visibleRange[0] - 1) : 247 (visibleRange[1] + 1); 248 tv.updateViewPropertiesToTaskTransform(null, 249 getStackTransform(fromIndex, stackScroll), 0); 250 } 251 } 252 } else { 253 if (tv != null) { 254 mViewPool.returnViewToPool(tv); 255 } 256 } 257 } 258 259 // Update all the remaining view children 260 // NOTE: We have to iterate in reverse where because we are removing views directly 261 int childCount = getChildCount(); 262 for (int i = childCount - 1; i >= 0; i--) { 263 TaskView tv = (TaskView) getChildAt(i); 264 Task task = tv.getTask(); 265 int taskIndex = mStack.indexOfTask(task); 266 if (taskIndex < 0 || !taskTransforms.get(taskIndex).visible) { 267 mViewPool.returnViewToPool(tv); 268 } else { 269 tv.updateViewPropertiesToTaskTransform(null, taskTransforms.get(taskIndex), 270 mStackViewsAnimationDuration); 271 } 272 } 273 274 Console.log(Constants.DebugFlags.TaskStack.SynchronizeViewsWithModel, 275 " [TaskStackView|viewChildren]", "" + getChildCount()); 276 277 mStackViewsAnimationDuration = 0; 278 mStackViewsDirty = false; 279 } 280 } 281 282 /** Sets the current stack scroll */ 283 public void setStackScroll(int value) { 284 mStackScroll = value; 285 requestSynchronizeStackViewsWithModel(); 286 287 // Close any open info panes if the user has scrolled away from them 288 boolean isAnimatingScroll = (mScrollAnimator != null && mScrollAnimator.isRunning()); 289 if (mLastInfoPaneStackScroll > -1 && !isAnimatingScroll) { 290 RecentsConfiguration config = RecentsConfiguration.getInstance(); 291 if (Math.abs(mStackScroll - mLastInfoPaneStackScroll) > 292 config.taskStackScrollDismissInfoPaneDistance) { 293 // Close any open info panes 294 closeOpenInfoPanes(); 295 } 296 } 297 } 298 /** Sets the current stack scroll without synchronizing the stack view with the model */ 299 public void setStackScrollRaw(int value) { 300 mStackScroll = value; 301 } 302 303 /** Gets the current stack scroll */ 304 public int getStackScroll() { 305 return mStackScroll; 306 } 307 308 /** Animates the stack scroll into bounds */ 309 ObjectAnimator animateBoundScroll() { 310 int curScroll = getStackScroll(); 311 int newScroll = Math.max(mMinScroll, Math.min(mMaxScroll, curScroll)); 312 if (newScroll != curScroll) { 313 // Enable hw layers on the stack 314 addHwLayersRefCount("animateBoundScroll"); 315 316 // Start a new scroll animation 317 animateScroll(curScroll, newScroll, new Runnable() { 318 @Override 319 public void run() { 320 // Disable hw layers on the stack 321 decHwLayersRefCount("animateBoundScroll"); 322 } 323 }); 324 } 325 return mScrollAnimator; 326 } 327 328 /** Animates the stack scroll */ 329 void animateScroll(int curScroll, int newScroll, final Runnable postRunnable) { 330 // Abort any current animations 331 abortScroller(); 332 abortBoundScrollAnimation(); 333 334 mScrollAnimator = ObjectAnimator.ofInt(this, "stackScroll", curScroll, newScroll); 335 mScrollAnimator.setDuration(Utilities.calculateTranslationAnimationDuration(newScroll - 336 curScroll, 250)); 337 mScrollAnimator.setInterpolator(BakedBezierInterpolator.INSTANCE); 338 mScrollAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 339 @Override 340 public void onAnimationUpdate(ValueAnimator animation) { 341 setStackScroll((Integer) animation.getAnimatedValue()); 342 } 343 }); 344 mScrollAnimator.addListener(new AnimatorListenerAdapter() { 345 @Override 346 public void onAnimationEnd(Animator animation) { 347 if (postRunnable != null) { 348 postRunnable.run(); 349 } 350 mScrollAnimator.removeAllListeners(); 351 } 352 }); 353 mScrollAnimator.start(); 354 } 355 356 /** Aborts any current stack scrolls */ 357 void abortBoundScrollAnimation() { 358 if (mScrollAnimator != null) { 359 mScrollAnimator.cancel(); 360 } 361 } 362 363 /** Aborts the scroller and any current fling */ 364 void abortScroller() { 365 if (!mScroller.isFinished()) { 366 // Abort the scroller 367 mScroller.abortAnimation(); 368 // And disable hw layers on the stack 369 decHwLayersRefCount("flingScroll"); 370 } 371 } 372 373 /** Bounds the current scroll if necessary */ 374 public boolean boundScroll() { 375 int curScroll = getStackScroll(); 376 int newScroll = Math.max(mMinScroll, Math.min(mMaxScroll, curScroll)); 377 if (newScroll != curScroll) { 378 setStackScroll(newScroll); 379 return true; 380 } 381 return false; 382 } 383 384 /** 385 * Bounds the current scroll if necessary, but does not synchronize the stack view with the 386 * model. 387 */ 388 public boolean boundScrollRaw() { 389 int curScroll = getStackScroll(); 390 int newScroll = Math.max(mMinScroll, Math.min(mMaxScroll, curScroll)); 391 if (newScroll != curScroll) { 392 setStackScrollRaw(newScroll); 393 return true; 394 } 395 return false; 396 } 397 398 /** Returns whether the specified scroll is out of bounds */ 399 boolean isScrollOutOfBounds(int scroll) { 400 return (scroll < mMinScroll) || (scroll > mMaxScroll); 401 } 402 boolean isScrollOutOfBounds() { 403 return isScrollOutOfBounds(getStackScroll()); 404 } 405 406 /** Updates the min and max virtual scroll bounds */ 407 void updateMinMaxScroll(boolean boundScrollToNewMinMax) { 408 // Compute the min and max scroll values 409 int numTasks = Math.max(1, mStack.getTaskCount()); 410 int taskHeight = mTaskRect.height(); 411 int stackHeight = mStackRectSansPeek.height(); 412 int maxScrollHeight = taskHeight + (int) ((numTasks - 1) * 413 Constants.Values.TaskStackView.StackOverlapPct * taskHeight); 414 415 if (numTasks <= 1) { 416 // If there is only one task, then center the task in the stack rect (sans peek) 417 mMinScroll = mMaxScroll = -(stackHeight - taskHeight) / 2; 418 } else { 419 mMinScroll = Math.min(stackHeight, maxScrollHeight) - stackHeight; 420 mMaxScroll = maxScrollHeight - stackHeight; 421 } 422 423 // Debug logging 424 if (Constants.DebugFlags.UI.MeasureAndLayout) { 425 Console.log(" [TaskStack|minScroll] " + mMinScroll); 426 Console.log(" [TaskStack|maxScroll] " + mMaxScroll); 427 } 428 429 if (boundScrollToNewMinMax) { 430 boundScroll(); 431 } 432 } 433 434 /** Closes any open info panes. */ 435 boolean closeOpenInfoPanes() { 436 if (!Constants.DebugFlags.App.EnableInfoPane) return false; 437 438 int childCount = getChildCount(); 439 for (int i = 0; i < childCount; i++) { 440 TaskView tv = (TaskView) getChildAt(i); 441 if (tv.isInfoPaneVisible()) { 442 tv.hideInfoPane(); 443 return true; 444 } 445 } 446 return false; 447 } 448 449 /** Enables the hw layers and increments the hw layer requirement ref count */ 450 void addHwLayersRefCount(String reason) { 451 Console.log(Constants.DebugFlags.UI.HwLayers, 452 "[TaskStackView|addHwLayersRefCount] refCount: " + 453 mHwLayersRefCount + "->" + (mHwLayersRefCount + 1) + " " + reason); 454 if (mHwLayersRefCount == 0) { 455 // Enable hw layers on each of the children 456 int childCount = getChildCount(); 457 for (int i = 0; i < childCount; i++) { 458 TaskView tv = (TaskView) getChildAt(i); 459 tv.enableHwLayers(); 460 } 461 } 462 mHwLayersRefCount++; 463 } 464 465 /** Decrements the hw layer requirement ref count and disables the hw layers when we don't 466 need them anymore. */ 467 void decHwLayersRefCount(String reason) { 468 Console.log(Constants.DebugFlags.UI.HwLayers, 469 "[TaskStackView|decHwLayersRefCount] refCount: " + 470 mHwLayersRefCount + "->" + (mHwLayersRefCount - 1) + " " + reason); 471 mHwLayersRefCount--; 472 if (mHwLayersRefCount == 0) { 473 // Disable hw layers on each of the children 474 int childCount = getChildCount(); 475 for (int i = 0; i < childCount; i++) { 476 TaskView tv = (TaskView) getChildAt(i); 477 tv.disableHwLayers(); 478 } 479 } else if (mHwLayersRefCount < 0) { 480 new Throwable("Invalid hw layers ref count").printStackTrace(); 481 Console.logError(getContext(), "Invalid HW layers ref count"); 482 } 483 } 484 485 @Override 486 public void computeScroll() { 487 if (mScroller.computeScrollOffset()) { 488 setStackScroll(mScroller.getCurrY()); 489 invalidate(); 490 491 // If we just finished scrolling, then disable the hw layers 492 if (mScroller.isFinished()) { 493 decHwLayersRefCount("finishedFlingScroll"); 494 } 495 } 496 } 497 498 @Override 499 public boolean onInterceptTouchEvent(MotionEvent ev) { 500 return mTouchHandler.onInterceptTouchEvent(ev); 501 } 502 503 @Override 504 public boolean onTouchEvent(MotionEvent ev) { 505 return mTouchHandler.onTouchEvent(ev); 506 } 507 508 @Override 509 public void dispatchDraw(Canvas canvas) { 510 Console.log(Constants.DebugFlags.UI.Draw, "[TaskStackView|dispatchDraw]", "", 511 Console.AnsiPurple); 512 synchronizeStackViewsWithModel(); 513 super.dispatchDraw(canvas); 514 } 515 516 @Override 517 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 518 if (Constants.DebugFlags.App.EnableTaskStackClipping) { 519 TaskView tv = (TaskView) child; 520 TaskView nextTv = null; 521 int curIndex = indexOfChild(tv); 522 if ((curIndex > -1) && (curIndex < (getChildCount() - 1))) { 523 // Clip against the next view (if we aren't animating its alpha) 524 nextTv = (TaskView) getChildAt(curIndex + 1); 525 if (nextTv.getAlpha() == 1f) { 526 Rect curRect = tv.getClippingRect(mTmpRect); 527 Rect nextRect = nextTv.getClippingRect(mTmpRect2); 528 RecentsConfiguration config = RecentsConfiguration.getInstance(); 529 // The hit rects are relative to the task view, which needs to be offset by the 530 // system bar height 531 curRect.offset(0, config.systemInsets.top); 532 nextRect.offset(0, config.systemInsets.top); 533 // Compute the clip region 534 Region clipRegion = new Region(); 535 clipRegion.op(curRect, Region.Op.UNION); 536 clipRegion.op(nextRect, Region.Op.DIFFERENCE); 537 // Clip the canvas 538 int saveCount = canvas.save(Canvas.CLIP_SAVE_FLAG); 539 canvas.clipRegion(clipRegion); 540 boolean invalidate = super.drawChild(canvas, child, drawingTime); 541 canvas.restoreToCount(saveCount); 542 return invalidate; 543 } 544 } 545 } 546 return super.drawChild(canvas, child, drawingTime); 547 } 548 549 /** Computes the stack and task rects */ 550 public void computeRects(int width, int height, int insetLeft, int insetBottom) { 551 // Note: We let the stack view be the full height because we want the cards to go under the 552 // navigation bar if possible. However, the stack rects which we use to calculate 553 // max scroll, etc. need to take the nav bar into account 554 555 // Compute the stack rects 556 mRect.set(0, 0, width, height); 557 mStackRect.set(mRect); 558 mStackRect.left += insetLeft; 559 mStackRect.bottom -= insetBottom; 560 561 int smallestDimension = Math.min(width, height); 562 int padding = (int) (Constants.Values.TaskStackView.StackPaddingPct * smallestDimension / 2f); 563 if (Constants.DebugFlags.App.EnableSearchButton) { 564 // Don't need to pad the top since we have some padding on the search bar already 565 mStackRect.left += padding; 566 mStackRect.right -= padding; 567 mStackRect.bottom -= padding; 568 } else { 569 mStackRect.inset(padding, padding); 570 } 571 mStackRectSansPeek.set(mStackRect); 572 mStackRectSansPeek.top += Constants.Values.TaskStackView.StackPeekHeightPct * mStackRect.height(); 573 574 // Compute the task rect 575 int minHeight = (int) (mStackRect.height() - 576 (Constants.Values.TaskStackView.StackPeekHeightPct * mStackRect.height())); 577 int size = Math.min(minHeight, Math.min(mStackRect.width(), mStackRect.height())); 578 int left = mStackRect.left + (mStackRect.width() - size) / 2; 579 mTaskRect.set(left, mStackRectSansPeek.top, 580 left + size, mStackRectSansPeek.top + size); 581 582 // Update the scroll bounds 583 updateMinMaxScroll(false); 584 } 585 586 /** 587 * This is called with the size of the space not including the top or right insets, or the 588 * search bar height in portrait (but including the search bar width in landscape, since we want 589 * to draw under it. 590 */ 591 @Override 592 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 593 int width = MeasureSpec.getSize(widthMeasureSpec); 594 int height = MeasureSpec.getSize(heightMeasureSpec); 595 Console.log(Constants.DebugFlags.UI.MeasureAndLayout, "[TaskStackView|measure]", 596 "width: " + width + " height: " + height + 597 " awaitingFirstLayout: " + mAwaitingFirstLayout, Console.AnsiGreen); 598 599 // Compute our stack/task rects 600 RecentsConfiguration config = RecentsConfiguration.getInstance(); 601 Rect taskStackBounds = new Rect(); 602 config.getTaskStackBounds(width, height, taskStackBounds); 603 computeRects(width, height, taskStackBounds.left, config.systemInsets.bottom); 604 605 // Debug logging 606 if (Constants.DebugFlags.UI.MeasureAndLayout) { 607 Console.log(" [TaskStack|fullRect] " + mRect); 608 Console.log(" [TaskStack|stackRect] " + mStackRect); 609 Console.log(" [TaskStack|stackRectSansPeek] " + mStackRectSansPeek); 610 Console.log(" [TaskStack|taskRect] " + mTaskRect); 611 } 612 613 // If this is the first layout, then scroll to the front of the stack and synchronize the 614 // stack views immediately 615 if (mAwaitingFirstLayout) { 616 setStackScroll(mMaxScroll); 617 requestSynchronizeStackViewsWithModel(); 618 synchronizeStackViewsWithModel(); 619 620 // Animate the task bar of the first task view 621 if (config.launchedWithThumbnailAnimation && 622 Constants.Values.TaskView.AnimateFrontTaskBarOnEnterRecents) { 623 TaskView tv = (TaskView) getChildAt(getChildCount() - 1); 624 if (tv != null) { 625 tv.animateOnEnterRecents(); 626 } 627 } 628 } 629 630 // Measure each of the children 631 int childCount = getChildCount(); 632 for (int i = 0; i < childCount; i++) { 633 TaskView t = (TaskView) getChildAt(i); 634 t.measure(MeasureSpec.makeMeasureSpec(mTaskRect.width(), MeasureSpec.EXACTLY), 635 MeasureSpec.makeMeasureSpec(mTaskRect.height(), MeasureSpec.EXACTLY)); 636 } 637 638 setMeasuredDimension(width, height); 639 } 640 641 /** 642 * This is called with the size of the space not including the top or right insets, or the 643 * search bar height in portrait (but including the search bar width in landscape, since we want 644 * to draw under it. 645 */ 646 @Override 647 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 648 Console.log(Constants.DebugFlags.UI.MeasureAndLayout, "[TaskStackView|layout]", 649 "" + new Rect(left, top, right, bottom), Console.AnsiGreen); 650 651 // Debug logging 652 if (Constants.DebugFlags.UI.MeasureAndLayout) { 653 Console.log(" [TaskStack|fullRect] " + mRect); 654 Console.log(" [TaskStack|stackRect] " + mStackRect); 655 Console.log(" [TaskStack|stackRectSansPeek] " + mStackRectSansPeek); 656 Console.log(" [TaskStack|taskRect] " + mTaskRect); 657 } 658 659 // Layout each of the children 660 int childCount = getChildCount(); 661 for (int i = 0; i < childCount; i++) { 662 TaskView t = (TaskView) getChildAt(i); 663 t.layout(mTaskRect.left, mStackRectSansPeek.top, 664 mTaskRect.right, mStackRectSansPeek.top + mTaskRect.height()); 665 } 666 667 if (mAwaitingFirstLayout) { 668 mAwaitingFirstLayout = false; 669 } 670 } 671 672 @Override 673 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 674 super.onScrollChanged(l, t, oldl, oldt); 675 requestSynchronizeStackViewsWithModel(); 676 } 677 678 public boolean isTransformedTouchPointInView(float x, float y, View child) { 679 return isTransformedTouchPointInView(x, y, child, null); 680 } 681 682 /**** TaskStackCallbacks Implementation ****/ 683 684 @Override 685 public void onStackTaskAdded(TaskStack stack, Task t) { 686 requestSynchronizeStackViewsWithModel(); 687 } 688 689 @Override 690 public void onStackTaskRemoved(TaskStack stack, Task t) { 691 // Remove the view associated with this task, we can't rely on updateTransforms 692 // to work here because the task is no longer in the list 693 int childCount = getChildCount(); 694 for (int i = childCount - 1; i >= 0; i--) { 695 TaskView tv = (TaskView) getChildAt(i); 696 if (tv.getTask() == t) { 697 mViewPool.returnViewToPool(tv); 698 break; 699 } 700 } 701 702 updateMinMaxScroll(true); 703 int movement = (int) (Constants.Values.TaskStackView.StackOverlapPct * mTaskRect.height()); 704 requestSynchronizeStackViewsWithModel(Utilities.calculateTranslationAnimationDuration(movement)); 705 } 706 707 /** 708 * Creates the animations for all the children views that need to be removed or to move views 709 * to their un/filtered position when we are un/filtering a stack, and returns the duration 710 * for these animations. 711 */ 712 int getExitTransformsForFilterAnimation(ArrayList<Task> curTasks, 713 ArrayList<TaskViewTransform> curTaskTransforms, 714 ArrayList<Task> tasks, ArrayList<TaskViewTransform> taskTransforms, 715 HashMap<TaskView, Pair<Integer, TaskViewTransform>> childViewTransformsOut, 716 ArrayList<TaskView> childrenToRemoveOut, 717 RecentsConfiguration config) { 718 // Animate all of the existing views out of view (if they are not in the visible range in 719 // the new stack) or to their final positions in the new stack 720 int movement = 0; 721 int childCount = getChildCount(); 722 for (int i = 0; i < childCount; i++) { 723 TaskView tv = (TaskView) getChildAt(i); 724 Task task = tv.getTask(); 725 int taskIndex = tasks.indexOf(task); 726 TaskViewTransform toTransform; 727 728 // If the view is no longer visible, then we should just animate it out 729 boolean willBeInvisible = taskIndex < 0 || !taskTransforms.get(taskIndex).visible; 730 if (willBeInvisible) { 731 if (taskIndex < 0) { 732 toTransform = curTaskTransforms.get(curTasks.indexOf(task)); 733 } else { 734 toTransform = new TaskViewTransform(taskTransforms.get(taskIndex)); 735 } 736 tv.prepareTaskTransformForFilterTaskVisible(toTransform); 737 childrenToRemoveOut.add(tv); 738 } else { 739 toTransform = taskTransforms.get(taskIndex); 740 // Use the movement of the visible views to calculate the duration of the animation 741 movement = Math.max(movement, Math.abs(toTransform.translationY - 742 (int) tv.getTranslationY())); 743 } 744 childViewTransformsOut.put(tv, new Pair(0, toTransform)); 745 } 746 return Utilities.calculateTranslationAnimationDuration(movement, 747 config.filteringCurrentViewsMinAnimDuration); 748 } 749 750 /** 751 * Creates the animations for all the children views that need to be animated in when we are 752 * un/filtering a stack, and returns the duration for these animations. 753 */ 754 int getEnterTransformsForFilterAnimation(ArrayList<Task> tasks, 755 ArrayList<TaskViewTransform> taskTransforms, 756 HashMap<TaskView, Pair<Integer, TaskViewTransform>> childViewTransformsOut, 757 RecentsConfiguration config) { 758 int offset = 0; 759 int movement = 0; 760 int taskCount = tasks.size(); 761 for (int i = taskCount - 1; i >= 0; i--) { 762 Task task = tasks.get(i); 763 TaskViewTransform toTransform = taskTransforms.get(i); 764 if (toTransform.visible) { 765 TaskView tv = getChildViewForTask(task); 766 if (tv == null) { 767 // For views that are not already visible, animate them in 768 tv = mViewPool.pickUpViewFromPool(task, task); 769 770 // Compose a new transform to fade and slide the new task in 771 TaskViewTransform fromTransform = new TaskViewTransform(toTransform); 772 tv.prepareTaskTransformForFilterTaskHidden(fromTransform); 773 tv.updateViewPropertiesToTaskTransform(null, fromTransform, 0); 774 775 int startDelay = offset * 776 Constants.Values.TaskStackView.FilterStartDelay; 777 childViewTransformsOut.put(tv, new Pair(startDelay, toTransform)); 778 779 // Use the movement of the new views to calculate the duration of the animation 780 movement = Math.max(movement, 781 Math.abs(toTransform.translationY - fromTransform.translationY)); 782 offset++; 783 } 784 } 785 } 786 return Utilities.calculateTranslationAnimationDuration(movement, 787 config.filteringNewViewsMinAnimDuration); 788 } 789 790 /** Orchestrates the animations of the current child views and any new views. */ 791 void doFilteringAnimation(ArrayList<Task> curTasks, 792 ArrayList<TaskViewTransform> curTaskTransforms, 793 final ArrayList<Task> tasks, 794 final ArrayList<TaskViewTransform> taskTransforms) { 795 final RecentsConfiguration config = RecentsConfiguration.getInstance(); 796 797 // Calculate the transforms to animate out all the existing views if they are not in the 798 // new visible range (or to their final positions in the stack if they are) 799 final ArrayList<TaskView> childrenToRemove = new ArrayList<TaskView>(); 800 final HashMap<TaskView, Pair<Integer, TaskViewTransform>> childViewTransforms = 801 new HashMap<TaskView, Pair<Integer, TaskViewTransform>>(); 802 int duration = getExitTransformsForFilterAnimation(curTasks, curTaskTransforms, tasks, 803 taskTransforms, childViewTransforms, childrenToRemove, config); 804 805 // If all the current views are in the visible range of the new stack, then don't wait for 806 // views to animate out and animate all the new views into their place 807 final boolean unifyNewViewAnimation = childrenToRemove.isEmpty(); 808 if (unifyNewViewAnimation) { 809 int inDuration = getEnterTransformsForFilterAnimation(tasks, taskTransforms, 810 childViewTransforms, config); 811 duration = Math.max(duration, inDuration); 812 } 813 814 // Animate all the views to their final transforms 815 for (final TaskView tv : childViewTransforms.keySet()) { 816 Pair<Integer, TaskViewTransform> t = childViewTransforms.get(tv); 817 tv.animate().cancel(); 818 tv.animate() 819 .setStartDelay(t.first) 820 .withEndAction(new Runnable() { 821 @Override 822 public void run() { 823 childViewTransforms.remove(tv); 824 if (childViewTransforms.isEmpty()) { 825 // Return all the removed children to the view pool 826 for (TaskView tv : childrenToRemove) { 827 mViewPool.returnViewToPool(tv); 828 } 829 830 if (!unifyNewViewAnimation) { 831 // For views that are not already visible, animate them in 832 childViewTransforms.clear(); 833 int duration = getEnterTransformsForFilterAnimation(tasks, 834 taskTransforms, childViewTransforms, config); 835 for (final TaskView tv : childViewTransforms.keySet()) { 836 Pair<Integer, TaskViewTransform> t = childViewTransforms.get(tv); 837 tv.animate().setStartDelay(t.first); 838 tv.updateViewPropertiesToTaskTransform(null, t.second, duration); 839 } 840 } 841 } 842 } 843 }); 844 tv.updateViewPropertiesToTaskTransform(null, t.second, duration); 845 } 846 } 847 848 @Override 849 public void onStackFiltered(TaskStack newStack, final ArrayList<Task> curTasks, 850 Task filteredTask) { 851 // Close any open info panes 852 closeOpenInfoPanes(); 853 854 // Stash the scroll and filtered task for us to restore to when we unfilter 855 mStashedScroll = getStackScroll(); 856 857 // Calculate the current task transforms 858 ArrayList<TaskViewTransform> curTaskTransforms = 859 getStackTransforms(curTasks, getStackScroll(), null, true); 860 861 // Scroll the item to the top of the stack (sans-peek) rect so that we can see it better 862 updateMinMaxScroll(false); 863 float overlapHeight = Constants.Values.TaskStackView.StackOverlapPct * mTaskRect.height(); 864 setStackScrollRaw((int) (newStack.indexOfTask(filteredTask) * overlapHeight)); 865 boundScrollRaw(); 866 867 // Compute the transforms of the items in the new stack after setting the new scroll 868 final ArrayList<Task> tasks = mStack.getTasks(); 869 final ArrayList<TaskViewTransform> taskTransforms = 870 getStackTransforms(mStack.getTasks(), getStackScroll(), null, true); 871 872 // Animate 873 doFilteringAnimation(curTasks, curTaskTransforms, tasks, taskTransforms); 874 } 875 876 @Override 877 public void onStackUnfiltered(TaskStack newStack, final ArrayList<Task> curTasks) { 878 // Close any open info panes 879 closeOpenInfoPanes(); 880 881 // Calculate the current task transforms 882 final ArrayList<TaskViewTransform> curTaskTransforms = 883 getStackTransforms(curTasks, getStackScroll(), null, true); 884 885 // Restore the stashed scroll 886 updateMinMaxScroll(false); 887 setStackScrollRaw(mStashedScroll); 888 boundScrollRaw(); 889 890 // Compute the transforms of the items in the new stack after restoring the stashed scroll 891 final ArrayList<Task> tasks = mStack.getTasks(); 892 final ArrayList<TaskViewTransform> taskTransforms = 893 getStackTransforms(tasks, getStackScroll(), null, true); 894 895 // Animate 896 doFilteringAnimation(curTasks, curTaskTransforms, tasks, taskTransforms); 897 898 // Clear the saved vars 899 mStashedScroll = 0; 900 } 901 902 /**** ViewPoolConsumer Implementation ****/ 903 904 @Override 905 public TaskView createView(Context context) { 906 Console.log(Constants.DebugFlags.ViewPool.PoolCallbacks, "[TaskStackView|createPoolView]"); 907 return (TaskView) mInflater.inflate(R.layout.recents_task_view, this, false); 908 } 909 910 @Override 911 public void prepareViewToEnterPool(TaskView tv) { 912 Task task = tv.getTask(); 913 tv.resetViewProperties(); 914 Console.log(Constants.DebugFlags.ViewPool.PoolCallbacks, "[TaskStackView|returnToPool]", 915 tv.getTask() + " tv: " + tv); 916 917 // Report that this tasks's data is no longer being used 918 RecentsTaskLoader loader = RecentsTaskLoader.getInstance(); 919 loader.unloadTaskData(task); 920 921 // Detach the view from the hierarchy 922 detachViewFromParent(tv); 923 924 // Disable hw layers on this view 925 tv.disableHwLayers(); 926 } 927 928 @Override 929 public void prepareViewToLeavePool(TaskView tv, Task prepareData, boolean isNewView) { 930 Console.log(Constants.DebugFlags.ViewPool.PoolCallbacks, "[TaskStackView|leavePool]", 931 "isNewView: " + isNewView); 932 933 // Setup and attach the view to the window 934 Task task = prepareData; 935 // We try and rebind the task (this MUST be done before the task filled) 936 tv.onTaskBound(task); 937 // Request that this tasks's data be filled 938 RecentsTaskLoader loader = RecentsTaskLoader.getInstance(); 939 loader.loadTaskData(task); 940 941 // Find the index where this task should be placed in the children 942 int insertIndex = -1; 943 int childCount = getChildCount(); 944 for (int i = 0; i < childCount; i++) { 945 Task tvTask = ((TaskView) getChildAt(i)).getTask(); 946 if (mStack.containsTask(task) && (mStack.indexOfTask(task) < mStack.indexOfTask(tvTask))) { 947 insertIndex = i; 948 break; 949 } 950 } 951 952 // Add/attach the view to the hierarchy 953 Console.log(Constants.DebugFlags.ViewPool.PoolCallbacks, " [TaskStackView|insertIndex]", 954 "" + insertIndex); 955 if (isNewView) { 956 addView(tv, insertIndex); 957 958 // Set the callbacks and listeners for this new view 959 tv.setOnClickListener(this); 960 if (Constants.DebugFlags.App.EnableInfoPane) { 961 tv.setOnLongClickListener(this); 962 } 963 tv.setCallbacks(this); 964 } else { 965 attachViewToParent(tv, insertIndex, tv.getLayoutParams()); 966 } 967 968 // Enable hw layers on this view if hw layers are enabled on the stack 969 if (mHwLayersRefCount > 0) { 970 tv.enableHwLayers(); 971 } 972 } 973 974 @Override 975 public boolean hasPreferredData(TaskView tv, Task preferredData) { 976 return (tv.getTask() == preferredData); 977 } 978 979 /**** TaskViewCallbacks Implementation ****/ 980 981 @Override 982 public void onTaskIconClicked(TaskView tv) { 983 Console.log(Constants.DebugFlags.UI.ClickEvents, "[TaskStack|Clicked|Icon]", 984 tv.getTask() + " is currently filtered: " + mStack.hasFilteredTasks(), 985 Console.AnsiCyan); 986 if (Constants.DebugFlags.App.EnableTaskFiltering) { 987 if (mStack.hasFilteredTasks()) { 988 mStack.unfilterTasks(); 989 } else { 990 mStack.filterTasks(tv.getTask()); 991 } 992 } 993 } 994 995 @Override 996 public void onTaskInfoPanelShown(TaskView tv) { 997 // Do nothing 998 } 999 1000 @Override 1001 public void onTaskInfoPanelHidden(TaskView tv) { 1002 // Unset the saved scroll 1003 mLastInfoPaneStackScroll = -1; 1004 } 1005 1006 @Override 1007 public void onTaskAppInfoClicked(TaskView tv) { 1008 if (mCb != null) { 1009 mCb.onTaskAppInfoLaunched(tv.getTask()); 1010 } 1011 } 1012 1013 /**** View.OnClickListener Implementation ****/ 1014 1015 @Override 1016 public void onClick(View v) { 1017 TaskView tv = (TaskView) v; 1018 Task task = tv.getTask(); 1019 Console.log(Constants.DebugFlags.UI.ClickEvents, "[TaskStack|Clicked|Thumbnail]", 1020 task + " cb: " + mCb); 1021 1022 // Close any open info panes if the user taps on another task 1023 if (closeOpenInfoPanes()) { 1024 return; 1025 } 1026 1027 if (mCb != null) { 1028 mCb.onTaskLaunched(this, tv, mStack, task); 1029 } 1030 } 1031 1032 @Override 1033 public boolean onLongClick(View v) { 1034 if (!Constants.DebugFlags.App.EnableInfoPane) return false; 1035 1036 TaskView tv = (TaskView) v; 1037 1038 // Close any other task info panels if we launch another info pane 1039 closeOpenInfoPanes(); 1040 1041 // Scroll the task view so that it is maximally visible 1042 float overlapHeight = Constants.Values.TaskStackView.StackOverlapPct * mTaskRect.height(); 1043 int taskIndex = mStack.indexOfTask(tv.getTask()); 1044 int curScroll = getStackScroll(); 1045 int newScroll = (int) Math.max(mMinScroll, Math.min(mMaxScroll, taskIndex * overlapHeight)); 1046 TaskViewTransform transform = getStackTransform(taskIndex, curScroll); 1047 Rect nonOverlapRect = new Rect(transform.rect); 1048 if (taskIndex < (mStack.getTaskCount() - 1)) { 1049 nonOverlapRect.bottom = nonOverlapRect.top + (int) overlapHeight; 1050 } 1051 1052 // XXX: Use HW Layers 1053 if (transform.t < 0f) { 1054 animateScroll(curScroll, newScroll, null); 1055 } else if (nonOverlapRect.bottom > mStackRectSansPeek.bottom) { 1056 // Check if we are out of bounds, if so, just scroll it in such that the bottom of the 1057 // task view is visible 1058 newScroll = curScroll - (mStackRectSansPeek.bottom - nonOverlapRect.bottom); 1059 animateScroll(curScroll, newScroll, null); 1060 } 1061 mLastInfoPaneStackScroll = newScroll; 1062 1063 // Show the info pane for this task view 1064 tv.showInfoPane(new Rect(0, 0, 0, (int) overlapHeight)); 1065 return true; 1066 } 1067} 1068 1069/* Handles touch events */ 1070class TaskStackViewTouchHandler implements SwipeHelper.Callback { 1071 static int INACTIVE_POINTER_ID = -1; 1072 1073 TaskStackView mSv; 1074 VelocityTracker mVelocityTracker; 1075 1076 boolean mIsScrolling; 1077 1078 int mInitialMotionX, mInitialMotionY; 1079 int mLastMotionX, mLastMotionY; 1080 int mActivePointerId = INACTIVE_POINTER_ID; 1081 TaskView mActiveTaskView = null; 1082 1083 int mTotalScrollMotion; 1084 int mMinimumVelocity; 1085 int mMaximumVelocity; 1086 // The scroll touch slop is used to calculate when we start scrolling 1087 int mScrollTouchSlop; 1088 // The page touch slop is used to calculate when we start swiping 1089 float mPagingTouchSlop; 1090 1091 SwipeHelper mSwipeHelper; 1092 boolean mInterceptedBySwipeHelper; 1093 1094 public TaskStackViewTouchHandler(Context context, TaskStackView sv) { 1095 ViewConfiguration configuration = ViewConfiguration.get(context); 1096 mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 1097 mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 1098 mScrollTouchSlop = configuration.getScaledTouchSlop(); 1099 mPagingTouchSlop = configuration.getScaledPagingTouchSlop(); 1100 mSv = sv; 1101 1102 1103 float densityScale = context.getResources().getDisplayMetrics().density; 1104 mSwipeHelper = new SwipeHelper(SwipeHelper.X, this, densityScale, mPagingTouchSlop); 1105 mSwipeHelper.setMinAlpha(1f); 1106 } 1107 1108 /** Velocity tracker helpers */ 1109 void initOrResetVelocityTracker() { 1110 if (mVelocityTracker == null) { 1111 mVelocityTracker = VelocityTracker.obtain(); 1112 } else { 1113 mVelocityTracker.clear(); 1114 } 1115 } 1116 void initVelocityTrackerIfNotExists() { 1117 if (mVelocityTracker == null) { 1118 mVelocityTracker = VelocityTracker.obtain(); 1119 } 1120 } 1121 void recycleVelocityTracker() { 1122 if (mVelocityTracker != null) { 1123 mVelocityTracker.recycle(); 1124 mVelocityTracker = null; 1125 } 1126 } 1127 1128 /** Returns the view at the specified coordinates */ 1129 TaskView findViewAtPoint(int x, int y) { 1130 int childCount = mSv.getChildCount(); 1131 for (int i = childCount - 1; i >= 0; i--) { 1132 TaskView tv = (TaskView) mSv.getChildAt(i); 1133 if (tv.getVisibility() == View.VISIBLE) { 1134 if (mSv.isTransformedTouchPointInView(x, y, tv)) { 1135 return tv; 1136 } 1137 } 1138 } 1139 return null; 1140 } 1141 1142 /** Touch preprocessing for handling below */ 1143 public boolean onInterceptTouchEvent(MotionEvent ev) { 1144 Console.log(Constants.DebugFlags.UI.TouchEvents, 1145 "[TaskStackViewTouchHandler|interceptTouchEvent]", 1146 Console.motionEventActionToString(ev.getAction()), Console.AnsiBlue); 1147 1148 // Return early if we have no children 1149 boolean hasChildren = (mSv.getChildCount() > 0); 1150 if (!hasChildren) { 1151 return false; 1152 } 1153 1154 // Pass through to swipe helper if we are swiping 1155 mInterceptedBySwipeHelper = mSwipeHelper.onInterceptTouchEvent(ev); 1156 if (mInterceptedBySwipeHelper) { 1157 return true; 1158 } 1159 1160 boolean wasScrolling = !mSv.mScroller.isFinished() || 1161 (mSv.mScrollAnimator != null && mSv.mScrollAnimator.isRunning()); 1162 int action = ev.getAction(); 1163 switch (action & MotionEvent.ACTION_MASK) { 1164 case MotionEvent.ACTION_DOWN: { 1165 // Save the touch down info 1166 mInitialMotionX = mLastMotionX = (int) ev.getX(); 1167 mInitialMotionY = mLastMotionY = (int) ev.getY(); 1168 mActivePointerId = ev.getPointerId(0); 1169 mActiveTaskView = findViewAtPoint(mLastMotionX, mLastMotionY); 1170 // Stop the current scroll if it is still flinging 1171 mSv.abortScroller(); 1172 mSv.abortBoundScrollAnimation(); 1173 // Initialize the velocity tracker 1174 initOrResetVelocityTracker(); 1175 mVelocityTracker.addMovement(ev); 1176 // Check if the scroller is finished yet 1177 mIsScrolling = !mSv.mScroller.isFinished(); 1178 break; 1179 } 1180 case MotionEvent.ACTION_MOVE: { 1181 if (mActivePointerId == INACTIVE_POINTER_ID) break; 1182 1183 int activePointerIndex = ev.findPointerIndex(mActivePointerId); 1184 int y = (int) ev.getY(activePointerIndex); 1185 int x = (int) ev.getX(activePointerIndex); 1186 if (Math.abs(y - mInitialMotionY) > mScrollTouchSlop) { 1187 // Save the touch move info 1188 mIsScrolling = true; 1189 // Initialize the velocity tracker if necessary 1190 initVelocityTrackerIfNotExists(); 1191 mVelocityTracker.addMovement(ev); 1192 // Disallow parents from intercepting touch events 1193 final ViewParent parent = mSv.getParent(); 1194 if (parent != null) { 1195 parent.requestDisallowInterceptTouchEvent(true); 1196 } 1197 // Enable HW layers 1198 mSv.addHwLayersRefCount("stackScroll"); 1199 } 1200 1201 mLastMotionX = x; 1202 mLastMotionY = y; 1203 break; 1204 } 1205 case MotionEvent.ACTION_CANCEL: 1206 case MotionEvent.ACTION_UP: { 1207 // Animate the scroll back if we've cancelled 1208 mSv.animateBoundScroll(); 1209 // Disable HW layers 1210 if (mIsScrolling) { 1211 mSv.decHwLayersRefCount("stackScroll"); 1212 } 1213 // Reset the drag state and the velocity tracker 1214 mIsScrolling = false; 1215 mActivePointerId = INACTIVE_POINTER_ID; 1216 mActiveTaskView = null; 1217 mTotalScrollMotion = 0; 1218 recycleVelocityTracker(); 1219 break; 1220 } 1221 } 1222 1223 return wasScrolling || mIsScrolling; 1224 } 1225 1226 /** Handles touch events once we have intercepted them */ 1227 public boolean onTouchEvent(MotionEvent ev) { 1228 Console.log(Constants.DebugFlags.UI.TouchEvents, 1229 "[TaskStackViewTouchHandler|touchEvent]", 1230 Console.motionEventActionToString(ev.getAction()), Console.AnsiBlue); 1231 1232 // Short circuit if we have no children 1233 boolean hasChildren = (mSv.getChildCount() > 0); 1234 if (!hasChildren) { 1235 return false; 1236 } 1237 1238 // Pass through to swipe helper if we are swiping 1239 if (mInterceptedBySwipeHelper && mSwipeHelper.onTouchEvent(ev)) { 1240 return true; 1241 } 1242 1243 // Update the velocity tracker 1244 initVelocityTrackerIfNotExists(); 1245 mVelocityTracker.addMovement(ev); 1246 1247 int action = ev.getAction(); 1248 switch (action & MotionEvent.ACTION_MASK) { 1249 case MotionEvent.ACTION_DOWN: { 1250 // Save the touch down info 1251 mInitialMotionX = mLastMotionX = (int) ev.getX(); 1252 mInitialMotionY = mLastMotionY = (int) ev.getY(); 1253 mActivePointerId = ev.getPointerId(0); 1254 mActiveTaskView = findViewAtPoint(mLastMotionX, mLastMotionY); 1255 // Stop the current scroll if it is still flinging 1256 mSv.abortScroller(); 1257 mSv.abortBoundScrollAnimation(); 1258 // Initialize the velocity tracker 1259 initOrResetVelocityTracker(); 1260 mVelocityTracker.addMovement(ev); 1261 // Disallow parents from intercepting touch events 1262 final ViewParent parent = mSv.getParent(); 1263 if (parent != null) { 1264 parent.requestDisallowInterceptTouchEvent(true); 1265 } 1266 break; 1267 } 1268 case MotionEvent.ACTION_POINTER_DOWN: { 1269 final int index = ev.getActionIndex(); 1270 mActivePointerId = ev.getPointerId(index); 1271 mLastMotionX = (int) ev.getX(index); 1272 mLastMotionY = (int) ev.getY(index); 1273 break; 1274 } 1275 case MotionEvent.ACTION_MOVE: { 1276 if (mActivePointerId == INACTIVE_POINTER_ID) break; 1277 1278 int activePointerIndex = ev.findPointerIndex(mActivePointerId); 1279 int x = (int) ev.getX(activePointerIndex); 1280 int y = (int) ev.getY(activePointerIndex); 1281 int yTotal = Math.abs(y - mInitialMotionY); 1282 int deltaY = mLastMotionY - y; 1283 if (!mIsScrolling) { 1284 if (yTotal > mScrollTouchSlop) { 1285 mIsScrolling = true; 1286 // Initialize the velocity tracker 1287 initOrResetVelocityTracker(); 1288 mVelocityTracker.addMovement(ev); 1289 // Disallow parents from intercepting touch events 1290 final ViewParent parent = mSv.getParent(); 1291 if (parent != null) { 1292 parent.requestDisallowInterceptTouchEvent(true); 1293 } 1294 // Enable HW layers 1295 mSv.addHwLayersRefCount("stackScroll"); 1296 } 1297 } 1298 if (mIsScrolling) { 1299 int curStackScroll = mSv.getStackScroll(); 1300 if (mSv.isScrollOutOfBounds(curStackScroll + deltaY)) { 1301 // Scale the touch if we are overscrolling 1302 deltaY /= Constants.Values.TaskStackView.TouchOverscrollScaleFactor; 1303 } 1304 mSv.setStackScroll(curStackScroll + deltaY); 1305 if (mSv.isScrollOutOfBounds()) { 1306 mVelocityTracker.clear(); 1307 } 1308 } 1309 mLastMotionX = x; 1310 mLastMotionY = y; 1311 mTotalScrollMotion += Math.abs(deltaY); 1312 break; 1313 } 1314 case MotionEvent.ACTION_UP: { 1315 final VelocityTracker velocityTracker = mVelocityTracker; 1316 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 1317 int velocity = (int) velocityTracker.getYVelocity(mActivePointerId); 1318 1319 if (mIsScrolling && (Math.abs(velocity) > mMinimumVelocity)) { 1320 // Enable HW layers on the stack 1321 mSv.addHwLayersRefCount("flingScroll"); 1322 int overscrollRange = (int) (Math.min(1f, 1323 Math.abs((float) velocity / mMaximumVelocity)) * 1324 Constants.Values.TaskStackView.TaskStackOverscrollRange); 1325 1326 Console.log(Constants.DebugFlags.UI.TouchEvents, 1327 "[TaskStackViewTouchHandler|fling]", 1328 "scroll: " + mSv.getStackScroll() + " velocity: " + velocity + 1329 " maxVelocity: " + mMaximumVelocity + 1330 " overscrollRange: " + overscrollRange, 1331 Console.AnsiGreen); 1332 1333 // Fling scroll 1334 mSv.mScroller.fling(0, mSv.getStackScroll(), 1335 0, -velocity, 1336 0, 0, 1337 mSv.mMinScroll, mSv.mMaxScroll, 1338 0, overscrollRange); 1339 // Invalidate to kick off computeScroll 1340 mSv.invalidate(); 1341 } else if (mSv.isScrollOutOfBounds()) { 1342 // Animate the scroll back into bounds 1343 // XXX: Make this animation a function of the velocity OR distance 1344 mSv.animateBoundScroll(); 1345 } 1346 1347 if (mIsScrolling) { 1348 // Disable HW layers 1349 mSv.decHwLayersRefCount("stackScroll"); 1350 } 1351 mActivePointerId = INACTIVE_POINTER_ID; 1352 mIsScrolling = false; 1353 mTotalScrollMotion = 0; 1354 recycleVelocityTracker(); 1355 break; 1356 } 1357 case MotionEvent.ACTION_POINTER_UP: { 1358 int pointerIndex = ev.getActionIndex(); 1359 int pointerId = ev.getPointerId(pointerIndex); 1360 if (pointerId == mActivePointerId) { 1361 // Select a new active pointer id and reset the motion state 1362 final int newPointerIndex = (pointerIndex == 0) ? 1 : 0; 1363 mActivePointerId = ev.getPointerId(newPointerIndex); 1364 mLastMotionX = (int) ev.getX(newPointerIndex); 1365 mLastMotionY = (int) ev.getY(newPointerIndex); 1366 mVelocityTracker.clear(); 1367 } 1368 break; 1369 } 1370 case MotionEvent.ACTION_CANCEL: { 1371 if (mIsScrolling) { 1372 // Disable HW layers 1373 mSv.decHwLayersRefCount("stackScroll"); 1374 } 1375 if (mSv.isScrollOutOfBounds()) { 1376 // Animate the scroll back into bounds 1377 // XXX: Make this animation a function of the velocity OR distance 1378 mSv.animateBoundScroll(); 1379 } 1380 mActivePointerId = INACTIVE_POINTER_ID; 1381 mIsScrolling = false; 1382 mTotalScrollMotion = 0; 1383 recycleVelocityTracker(); 1384 break; 1385 } 1386 } 1387 return true; 1388 } 1389 1390 /**** SwipeHelper Implementation ****/ 1391 1392 @Override 1393 public View getChildAtPosition(MotionEvent ev) { 1394 return findViewAtPoint((int) ev.getX(), (int) ev.getY()); 1395 } 1396 1397 @Override 1398 public boolean canChildBeDismissed(View v) { 1399 return true; 1400 } 1401 1402 @Override 1403 public void onBeginDrag(View v) { 1404 // Enable HW layers 1405 mSv.addHwLayersRefCount("swipeBegin"); 1406 // Disallow parents from intercepting touch events 1407 final ViewParent parent = mSv.getParent(); 1408 if (parent != null) { 1409 parent.requestDisallowInterceptTouchEvent(true); 1410 } 1411 // If the info panel is currently showing on this view, then we need to dismiss it 1412 if (Constants.DebugFlags.App.EnableInfoPane) { 1413 TaskView tv = (TaskView) v; 1414 if (tv.isInfoPaneVisible()) { 1415 tv.hideInfoPane(); 1416 } 1417 } 1418 } 1419 1420 @Override 1421 public void onChildDismissed(View v) { 1422 TaskView tv = (TaskView) v; 1423 Task task = tv.getTask(); 1424 Activity activity = (Activity) mSv.getContext(); 1425 1426 // Remove the task from the view 1427 mSv.mStack.removeTask(task); 1428 1429 // Remove any stored data from the loader 1430 RecentsTaskLoader loader = RecentsTaskLoader.getInstance(); 1431 loader.deleteTaskData(task); 1432 1433 // Remove the task from activity manager 1434 RecentsTaskLoader.getInstance().getSystemServicesProxy().removeTask(tv.getTask().key.id); 1435 1436 // If there are no remaining tasks, then either unfilter the current stack, or just close 1437 // the activity if there are no filtered stacks 1438 if (mSv.mStack.getTaskCount() == 0) { 1439 boolean shouldFinishActivity = true; 1440 if (mSv.mStack.hasFilteredTasks()) { 1441 mSv.mStack.unfilterTasks(); 1442 shouldFinishActivity = (mSv.mStack.getTaskCount() == 0); 1443 } 1444 if (shouldFinishActivity) { 1445 activity.finish(); 1446 } 1447 } 1448 1449 // Disable HW layers 1450 mSv.decHwLayersRefCount("swipeComplete"); 1451 } 1452 1453 @Override 1454 public void onSnapBackCompleted(View v) { 1455 // Do Nothing 1456 } 1457 1458 @Override 1459 public void onDragCancelled(View v) { 1460 // Disable HW layers 1461 mSv.decHwLayersRefCount("swipeCancelled"); 1462 } 1463} 1464