TaskStackView.java revision ecd9b3031c9a322bd69380eae2810d53839e8f64
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 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.bottom -= insetBottom; 559 560 int smallestDimension = Math.min(width, height); 561 int padding = (int) (Constants.Values.TaskStackView.StackPaddingPct * smallestDimension / 2f); 562 if (Constants.DebugFlags.App.EnableSearchButton) { 563 // Don't need to pad the top since we have some padding on the search bar already 564 mStackRect.left += padding; 565 mStackRect.right -= padding; 566 mStackRect.bottom -= padding; 567 } else { 568 mStackRect.inset(padding, padding); 569 } 570 mStackRectSansPeek.set(mStackRect); 571 mStackRectSansPeek.top += Constants.Values.TaskStackView.StackPeekHeightPct * mStackRect.height(); 572 573 // Compute the task rect 574 int minHeight = (int) (mStackRect.height() - 575 (Constants.Values.TaskStackView.StackPeekHeightPct * mStackRect.height())); 576 int size = Math.min(minHeight, Math.min(mStackRect.width(), mStackRect.height())); 577 int left = mStackRect.left + (mStackRect.width() - size) / 2; 578 mTaskRect.set(left, mStackRectSansPeek.top, 579 left + size, mStackRectSansPeek.top + size); 580 581 // Update the scroll bounds 582 updateMinMaxScroll(false); 583 } 584 585 @Override 586 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 587 int width = MeasureSpec.getSize(widthMeasureSpec); 588 int height = MeasureSpec.getSize(heightMeasureSpec); 589 Console.log(Constants.DebugFlags.UI.MeasureAndLayout, "[TaskStackView|measure]", 590 "width: " + width + " height: " + height + 591 " awaitingFirstLayout: " + mAwaitingFirstLayout, Console.AnsiGreen); 592 593 // Compute our stack/task rects 594 RecentsConfiguration config = RecentsConfiguration.getInstance(); 595 computeRects(width, height, config.systemInsets.bottom); 596 597 // Debug logging 598 if (Constants.DebugFlags.UI.MeasureAndLayout) { 599 Console.log(" [TaskStack|fullRect] " + mRect); 600 Console.log(" [TaskStack|stackRect] " + mStackRect); 601 Console.log(" [TaskStack|stackRectSansPeek] " + mStackRectSansPeek); 602 Console.log(" [TaskStack|taskRect] " + mTaskRect); 603 } 604 605 // If this is the first layout, then scroll to the front of the stack and synchronize the 606 // stack views immediately 607 if (mAwaitingFirstLayout) { 608 setStackScroll(mMaxScroll); 609 requestSynchronizeStackViewsWithModel(); 610 synchronizeStackViewsWithModel(); 611 612 // Animate the task bar of the first task view 613 if (config.launchedWithThumbnailAnimation && 614 Constants.Values.TaskView.AnimateFrontTaskBarOnEnterRecents) { 615 TaskView tv = (TaskView) getChildAt(getChildCount() - 1); 616 if (tv != null) { 617 tv.animateOnEnterRecents(); 618 } 619 } 620 } 621 622 // Measure each of the children 623 int childCount = getChildCount(); 624 for (int i = 0; i < childCount; i++) { 625 TaskView t = (TaskView) getChildAt(i); 626 t.measure(MeasureSpec.makeMeasureSpec(mTaskRect.width(), MeasureSpec.EXACTLY), 627 MeasureSpec.makeMeasureSpec(mTaskRect.height(), MeasureSpec.EXACTLY)); 628 } 629 630 setMeasuredDimension(width, height); 631 } 632 633 @Override 634 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 635 Console.log(Constants.DebugFlags.UI.MeasureAndLayout, "[TaskStackView|layout]", 636 "" + new Rect(left, top, right, bottom), Console.AnsiGreen); 637 638 // Debug logging 639 if (Constants.DebugFlags.UI.MeasureAndLayout) { 640 Console.log(" [TaskStack|fullRect] " + mRect); 641 Console.log(" [TaskStack|stackRect] " + mStackRect); 642 Console.log(" [TaskStack|stackRectSansPeek] " + mStackRectSansPeek); 643 Console.log(" [TaskStack|taskRect] " + mTaskRect); 644 } 645 646 // Layout each of the children 647 int childCount = getChildCount(); 648 for (int i = 0; i < childCount; i++) { 649 TaskView t = (TaskView) getChildAt(i); 650 t.layout(mTaskRect.left, mStackRectSansPeek.top, 651 mTaskRect.right, mStackRectSansPeek.top + mTaskRect.height()); 652 } 653 654 if (mAwaitingFirstLayout) { 655 mAwaitingFirstLayout = false; 656 } 657 } 658 659 @Override 660 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 661 super.onScrollChanged(l, t, oldl, oldt); 662 requestSynchronizeStackViewsWithModel(); 663 } 664 665 public boolean isTransformedTouchPointInView(float x, float y, View child) { 666 return isTransformedTouchPointInView(x, y, child, null); 667 } 668 669 /**** TaskStackCallbacks Implementation ****/ 670 671 @Override 672 public void onStackTaskAdded(TaskStack stack, Task t) { 673 requestSynchronizeStackViewsWithModel(); 674 } 675 676 @Override 677 public void onStackTaskRemoved(TaskStack stack, Task t) { 678 // Remove the view associated with this task, we can't rely on updateTransforms 679 // to work here because the task is no longer in the list 680 int childCount = getChildCount(); 681 for (int i = childCount - 1; i >= 0; i--) { 682 TaskView tv = (TaskView) getChildAt(i); 683 if (tv.getTask() == t) { 684 mViewPool.returnViewToPool(tv); 685 break; 686 } 687 } 688 689 updateMinMaxScroll(true); 690 int movement = (int) (Constants.Values.TaskStackView.StackOverlapPct * mTaskRect.height()); 691 requestSynchronizeStackViewsWithModel(Utilities.calculateTranslationAnimationDuration(movement)); 692 } 693 694 /** 695 * Creates the animations for all the children views that need to be removed or to move views 696 * to their un/filtered position when we are un/filtering a stack, and returns the duration 697 * for these animations. 698 */ 699 int getExitTransformsForFilterAnimation(ArrayList<Task> curTasks, 700 ArrayList<TaskViewTransform> curTaskTransforms, 701 ArrayList<Task> tasks, ArrayList<TaskViewTransform> taskTransforms, 702 HashMap<TaskView, Pair<Integer, TaskViewTransform>> childViewTransformsOut, 703 ArrayList<TaskView> childrenToRemoveOut, 704 RecentsConfiguration config) { 705 // Animate all of the existing views out of view (if they are not in the visible range in 706 // the new stack) or to their final positions in the new stack 707 int movement = 0; 708 int childCount = getChildCount(); 709 for (int i = 0; i < childCount; i++) { 710 TaskView tv = (TaskView) getChildAt(i); 711 Task task = tv.getTask(); 712 int taskIndex = tasks.indexOf(task); 713 TaskViewTransform toTransform; 714 715 // If the view is no longer visible, then we should just animate it out 716 boolean willBeInvisible = taskIndex < 0 || !taskTransforms.get(taskIndex).visible; 717 if (willBeInvisible) { 718 if (taskIndex < 0) { 719 toTransform = curTaskTransforms.get(curTasks.indexOf(task)); 720 } else { 721 toTransform = new TaskViewTransform(taskTransforms.get(taskIndex)); 722 } 723 tv.prepareTaskTransformForFilterTaskVisible(toTransform); 724 childrenToRemoveOut.add(tv); 725 } else { 726 toTransform = taskTransforms.get(taskIndex); 727 // Use the movement of the visible views to calculate the duration of the animation 728 movement = Math.max(movement, Math.abs(toTransform.translationY - 729 (int) tv.getTranslationY())); 730 } 731 childViewTransformsOut.put(tv, new Pair(0, toTransform)); 732 } 733 return Utilities.calculateTranslationAnimationDuration(movement, 734 config.filteringCurrentViewsMinAnimDuration); 735 } 736 737 /** 738 * Creates the animations for all the children views that need to be animated in when we are 739 * un/filtering a stack, and returns the duration for these animations. 740 */ 741 int getEnterTransformsForFilterAnimation(ArrayList<Task> tasks, 742 ArrayList<TaskViewTransform> taskTransforms, 743 HashMap<TaskView, Pair<Integer, TaskViewTransform>> childViewTransformsOut, 744 RecentsConfiguration config) { 745 int offset = 0; 746 int movement = 0; 747 int taskCount = tasks.size(); 748 for (int i = taskCount - 1; i >= 0; i--) { 749 Task task = tasks.get(i); 750 TaskViewTransform toTransform = taskTransforms.get(i); 751 if (toTransform.visible) { 752 TaskView tv = getChildViewForTask(task); 753 if (tv == null) { 754 // For views that are not already visible, animate them in 755 tv = mViewPool.pickUpViewFromPool(task, task); 756 757 // Compose a new transform to fade and slide the new task in 758 TaskViewTransform fromTransform = new TaskViewTransform(toTransform); 759 tv.prepareTaskTransformForFilterTaskHidden(fromTransform); 760 tv.updateViewPropertiesToTaskTransform(null, fromTransform, 0); 761 762 int startDelay = offset * 763 Constants.Values.TaskStackView.FilterStartDelay; 764 childViewTransformsOut.put(tv, new Pair(startDelay, toTransform)); 765 766 // Use the movement of the new views to calculate the duration of the animation 767 movement = Math.max(movement, 768 Math.abs(toTransform.translationY - fromTransform.translationY)); 769 offset++; 770 } 771 } 772 } 773 return Utilities.calculateTranslationAnimationDuration(movement, 774 config.filteringNewViewsMinAnimDuration); 775 } 776 777 /** Orchestrates the animations of the current child views and any new views. */ 778 void doFilteringAnimation(ArrayList<Task> curTasks, 779 ArrayList<TaskViewTransform> curTaskTransforms, 780 final ArrayList<Task> tasks, 781 final ArrayList<TaskViewTransform> taskTransforms) { 782 final RecentsConfiguration config = RecentsConfiguration.getInstance(); 783 784 // Calculate the transforms to animate out all the existing views if they are not in the 785 // new visible range (or to their final positions in the stack if they are) 786 final ArrayList<TaskView> childrenToRemove = new ArrayList<TaskView>(); 787 final HashMap<TaskView, Pair<Integer, TaskViewTransform>> childViewTransforms = 788 new HashMap<TaskView, Pair<Integer, TaskViewTransform>>(); 789 int duration = getExitTransformsForFilterAnimation(curTasks, curTaskTransforms, tasks, 790 taskTransforms, childViewTransforms, childrenToRemove, config); 791 792 // If all the current views are in the visible range of the new stack, then don't wait for 793 // views to animate out and animate all the new views into their place 794 final boolean unifyNewViewAnimation = childrenToRemove.isEmpty(); 795 if (unifyNewViewAnimation) { 796 int inDuration = getEnterTransformsForFilterAnimation(tasks, taskTransforms, 797 childViewTransforms, config); 798 duration = Math.max(duration, inDuration); 799 } 800 801 // Animate all the views to their final transforms 802 for (final TaskView tv : childViewTransforms.keySet()) { 803 Pair<Integer, TaskViewTransform> t = childViewTransforms.get(tv); 804 tv.animate().cancel(); 805 tv.animate() 806 .setStartDelay(t.first) 807 .withEndAction(new Runnable() { 808 @Override 809 public void run() { 810 childViewTransforms.remove(tv); 811 if (childViewTransforms.isEmpty()) { 812 // Return all the removed children to the view pool 813 for (TaskView tv : childrenToRemove) { 814 mViewPool.returnViewToPool(tv); 815 } 816 817 if (!unifyNewViewAnimation) { 818 // For views that are not already visible, animate them in 819 childViewTransforms.clear(); 820 int duration = getEnterTransformsForFilterAnimation(tasks, 821 taskTransforms, childViewTransforms, config); 822 for (final TaskView tv : childViewTransforms.keySet()) { 823 Pair<Integer, TaskViewTransform> t = childViewTransforms.get(tv); 824 tv.animate().setStartDelay(t.first); 825 tv.updateViewPropertiesToTaskTransform(null, t.second, duration); 826 } 827 } 828 } 829 } 830 }); 831 tv.updateViewPropertiesToTaskTransform(null, t.second, duration); 832 } 833 } 834 835 @Override 836 public void onStackFiltered(TaskStack newStack, final ArrayList<Task> curTasks, 837 Task filteredTask) { 838 // Close any open info panes 839 closeOpenInfoPanes(); 840 841 // Stash the scroll and filtered task for us to restore to when we unfilter 842 mStashedScroll = getStackScroll(); 843 844 // Calculate the current task transforms 845 ArrayList<TaskViewTransform> curTaskTransforms = 846 getStackTransforms(curTasks, getStackScroll(), null, true); 847 848 // Scroll the item to the top of the stack (sans-peek) rect so that we can see it better 849 updateMinMaxScroll(false); 850 float overlapHeight = Constants.Values.TaskStackView.StackOverlapPct * mTaskRect.height(); 851 setStackScrollRaw((int) (newStack.indexOfTask(filteredTask) * overlapHeight)); 852 boundScrollRaw(); 853 854 // Compute the transforms of the items in the new stack after setting the new scroll 855 final ArrayList<Task> tasks = mStack.getTasks(); 856 final ArrayList<TaskViewTransform> taskTransforms = 857 getStackTransforms(mStack.getTasks(), getStackScroll(), null, true); 858 859 // Animate 860 doFilteringAnimation(curTasks, curTaskTransforms, tasks, taskTransforms); 861 } 862 863 @Override 864 public void onStackUnfiltered(TaskStack newStack, final ArrayList<Task> curTasks) { 865 // Close any open info panes 866 closeOpenInfoPanes(); 867 868 // Calculate the current task transforms 869 final ArrayList<TaskViewTransform> curTaskTransforms = 870 getStackTransforms(curTasks, getStackScroll(), null, true); 871 872 // Restore the stashed scroll 873 updateMinMaxScroll(false); 874 setStackScrollRaw(mStashedScroll); 875 boundScrollRaw(); 876 877 // Compute the transforms of the items in the new stack after restoring the stashed scroll 878 final ArrayList<Task> tasks = mStack.getTasks(); 879 final ArrayList<TaskViewTransform> taskTransforms = 880 getStackTransforms(tasks, getStackScroll(), null, true); 881 882 // Animate 883 doFilteringAnimation(curTasks, curTaskTransforms, tasks, taskTransforms); 884 885 // Clear the saved vars 886 mStashedScroll = 0; 887 } 888 889 /**** ViewPoolConsumer Implementation ****/ 890 891 @Override 892 public TaskView createView(Context context) { 893 Console.log(Constants.DebugFlags.ViewPool.PoolCallbacks, "[TaskStackView|createPoolView]"); 894 return (TaskView) mInflater.inflate(R.layout.recents_task_view, this, false); 895 } 896 897 @Override 898 public void prepareViewToEnterPool(TaskView tv) { 899 Task task = tv.getTask(); 900 tv.resetViewProperties(); 901 Console.log(Constants.DebugFlags.ViewPool.PoolCallbacks, "[TaskStackView|returnToPool]", 902 tv.getTask() + " tv: " + tv); 903 904 // Report that this tasks's data is no longer being used 905 RecentsTaskLoader loader = RecentsTaskLoader.getInstance(); 906 loader.unloadTaskData(task); 907 908 // Detach the view from the hierarchy 909 detachViewFromParent(tv); 910 911 // Disable hw layers on this view 912 tv.disableHwLayers(); 913 } 914 915 @Override 916 public void prepareViewToLeavePool(TaskView tv, Task prepareData, boolean isNewView) { 917 Console.log(Constants.DebugFlags.ViewPool.PoolCallbacks, "[TaskStackView|leavePool]", 918 "isNewView: " + isNewView); 919 920 // Setup and attach the view to the window 921 Task task = prepareData; 922 // We try and rebind the task (this MUST be done before the task filled) 923 tv.onTaskBound(task); 924 // Request that this tasks's data be filled 925 RecentsTaskLoader loader = RecentsTaskLoader.getInstance(); 926 loader.loadTaskData(task); 927 928 // Find the index where this task should be placed in the children 929 int insertIndex = -1; 930 int childCount = getChildCount(); 931 for (int i = 0; i < childCount; i++) { 932 Task tvTask = ((TaskView) getChildAt(i)).getTask(); 933 if (mStack.containsTask(task) && (mStack.indexOfTask(task) < mStack.indexOfTask(tvTask))) { 934 insertIndex = i; 935 break; 936 } 937 } 938 939 // Add/attach the view to the hierarchy 940 Console.log(Constants.DebugFlags.ViewPool.PoolCallbacks, " [TaskStackView|insertIndex]", 941 "" + insertIndex); 942 if (isNewView) { 943 addView(tv, insertIndex); 944 945 // Set the callbacks and listeners for this new view 946 tv.setOnClickListener(this); 947 if (Constants.DebugFlags.App.EnableInfoPane) { 948 tv.setOnLongClickListener(this); 949 } 950 tv.setCallbacks(this); 951 } else { 952 attachViewToParent(tv, insertIndex, tv.getLayoutParams()); 953 } 954 955 // Enable hw layers on this view if hw layers are enabled on the stack 956 if (mHwLayersRefCount > 0) { 957 tv.enableHwLayers(); 958 } 959 } 960 961 @Override 962 public boolean hasPreferredData(TaskView tv, Task preferredData) { 963 return (tv.getTask() == preferredData); 964 } 965 966 /**** TaskViewCallbacks Implementation ****/ 967 968 @Override 969 public void onTaskIconClicked(TaskView tv) { 970 Console.log(Constants.DebugFlags.UI.ClickEvents, "[TaskStack|Clicked|Icon]", 971 tv.getTask() + " is currently filtered: " + mStack.hasFilteredTasks(), 972 Console.AnsiCyan); 973 if (Constants.DebugFlags.App.EnableTaskFiltering) { 974 if (mStack.hasFilteredTasks()) { 975 mStack.unfilterTasks(); 976 } else { 977 mStack.filterTasks(tv.getTask()); 978 } 979 } else { 980 Console.logError(getContext(), "Task Filtering TBD"); 981 } 982 } 983 984 @Override 985 public void onTaskInfoPanelShown(TaskView tv) { 986 // Do nothing 987 } 988 989 @Override 990 public void onTaskInfoPanelHidden(TaskView tv) { 991 // Unset the saved scroll 992 mLastInfoPaneStackScroll = -1; 993 } 994 995 @Override 996 public void onTaskAppInfoClicked(TaskView tv) { 997 if (mCb != null) { 998 mCb.onTaskAppInfoLaunched(tv.getTask()); 999 } 1000 } 1001 1002 /**** View.OnClickListener Implementation ****/ 1003 1004 @Override 1005 public void onClick(View v) { 1006 TaskView tv = (TaskView) v; 1007 Task task = tv.getTask(); 1008 Console.log(Constants.DebugFlags.UI.ClickEvents, "[TaskStack|Clicked|Thumbnail]", 1009 task + " cb: " + mCb); 1010 1011 // Close any open info panes if the user taps on another task 1012 if (closeOpenInfoPanes()) { 1013 return; 1014 } 1015 1016 if (mCb != null) { 1017 mCb.onTaskLaunched(this, tv, mStack, task); 1018 } 1019 } 1020 1021 @Override 1022 public boolean onLongClick(View v) { 1023 if (!Constants.DebugFlags.App.EnableInfoPane) return false; 1024 1025 TaskView tv = (TaskView) v; 1026 1027 // Close any other task info panels if we launch another info pane 1028 closeOpenInfoPanes(); 1029 1030 // Scroll the task view so that it is maximally visible 1031 float overlapHeight = Constants.Values.TaskStackView.StackOverlapPct * mTaskRect.height(); 1032 int taskIndex = mStack.indexOfTask(tv.getTask()); 1033 int curScroll = getStackScroll(); 1034 int newScroll = (int) Math.max(mMinScroll, Math.min(mMaxScroll, taskIndex * overlapHeight)); 1035 TaskViewTransform transform = getStackTransform(taskIndex, curScroll); 1036 Rect nonOverlapRect = new Rect(transform.rect); 1037 if (taskIndex < (mStack.getTaskCount() - 1)) { 1038 nonOverlapRect.bottom = nonOverlapRect.top + (int) overlapHeight; 1039 } 1040 1041 // XXX: Use HW Layers 1042 if (transform.t < 0f) { 1043 animateScroll(curScroll, newScroll, null); 1044 } else if (nonOverlapRect.bottom > mStackRectSansPeek.bottom) { 1045 // Check if we are out of bounds, if so, just scroll it in such that the bottom of the 1046 // task view is visible 1047 newScroll = curScroll - (mStackRectSansPeek.bottom - nonOverlapRect.bottom); 1048 animateScroll(curScroll, newScroll, null); 1049 } 1050 mLastInfoPaneStackScroll = newScroll; 1051 1052 // Show the info pane for this task view 1053 tv.showInfoPane(new Rect(0, 0, 0, (int) overlapHeight)); 1054 return true; 1055 } 1056} 1057 1058/* Handles touch events */ 1059class TaskStackViewTouchHandler implements SwipeHelper.Callback { 1060 static int INACTIVE_POINTER_ID = -1; 1061 1062 TaskStackView mSv; 1063 VelocityTracker mVelocityTracker; 1064 1065 boolean mIsScrolling; 1066 1067 int mInitialMotionX, mInitialMotionY; 1068 int mLastMotionX, mLastMotionY; 1069 int mActivePointerId = INACTIVE_POINTER_ID; 1070 TaskView mActiveTaskView = null; 1071 1072 int mTotalScrollMotion; 1073 int mMinimumVelocity; 1074 int mMaximumVelocity; 1075 // The scroll touch slop is used to calculate when we start scrolling 1076 int mScrollTouchSlop; 1077 // The page touch slop is used to calculate when we start swiping 1078 float mPagingTouchSlop; 1079 1080 SwipeHelper mSwipeHelper; 1081 boolean mInterceptedBySwipeHelper; 1082 1083 public TaskStackViewTouchHandler(Context context, TaskStackView sv) { 1084 ViewConfiguration configuration = ViewConfiguration.get(context); 1085 mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 1086 mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 1087 mScrollTouchSlop = configuration.getScaledTouchSlop(); 1088 mPagingTouchSlop = configuration.getScaledPagingTouchSlop(); 1089 mSv = sv; 1090 1091 1092 float densityScale = context.getResources().getDisplayMetrics().density; 1093 mSwipeHelper = new SwipeHelper(SwipeHelper.X, this, densityScale, mPagingTouchSlop); 1094 mSwipeHelper.setMinAlpha(1f); 1095 } 1096 1097 /** Velocity tracker helpers */ 1098 void initOrResetVelocityTracker() { 1099 if (mVelocityTracker == null) { 1100 mVelocityTracker = VelocityTracker.obtain(); 1101 } else { 1102 mVelocityTracker.clear(); 1103 } 1104 } 1105 void initVelocityTrackerIfNotExists() { 1106 if (mVelocityTracker == null) { 1107 mVelocityTracker = VelocityTracker.obtain(); 1108 } 1109 } 1110 void recycleVelocityTracker() { 1111 if (mVelocityTracker != null) { 1112 mVelocityTracker.recycle(); 1113 mVelocityTracker = null; 1114 } 1115 } 1116 1117 /** Returns the view at the specified coordinates */ 1118 TaskView findViewAtPoint(int x, int y) { 1119 int childCount = mSv.getChildCount(); 1120 for (int i = childCount - 1; i >= 0; i--) { 1121 TaskView tv = (TaskView) mSv.getChildAt(i); 1122 if (tv.getVisibility() == View.VISIBLE) { 1123 if (mSv.isTransformedTouchPointInView(x, y, tv)) { 1124 return tv; 1125 } 1126 } 1127 } 1128 return null; 1129 } 1130 1131 /** Touch preprocessing for handling below */ 1132 public boolean onInterceptTouchEvent(MotionEvent ev) { 1133 Console.log(Constants.DebugFlags.UI.TouchEvents, 1134 "[TaskStackViewTouchHandler|interceptTouchEvent]", 1135 Console.motionEventActionToString(ev.getAction()), Console.AnsiBlue); 1136 1137 // Return early if we have no children 1138 boolean hasChildren = (mSv.getChildCount() > 0); 1139 if (!hasChildren) { 1140 return false; 1141 } 1142 1143 // Pass through to swipe helper if we are swiping 1144 mInterceptedBySwipeHelper = mSwipeHelper.onInterceptTouchEvent(ev); 1145 if (mInterceptedBySwipeHelper) { 1146 return true; 1147 } 1148 1149 boolean wasScrolling = !mSv.mScroller.isFinished() || 1150 (mSv.mScrollAnimator != null && mSv.mScrollAnimator.isRunning()); 1151 int action = ev.getAction(); 1152 switch (action & MotionEvent.ACTION_MASK) { 1153 case MotionEvent.ACTION_DOWN: { 1154 // Save the touch down info 1155 mInitialMotionX = mLastMotionX = (int) ev.getX(); 1156 mInitialMotionY = mLastMotionY = (int) ev.getY(); 1157 mActivePointerId = ev.getPointerId(0); 1158 mActiveTaskView = findViewAtPoint(mLastMotionX, mLastMotionY); 1159 // Stop the current scroll if it is still flinging 1160 mSv.abortScroller(); 1161 mSv.abortBoundScrollAnimation(); 1162 // Initialize the velocity tracker 1163 initOrResetVelocityTracker(); 1164 mVelocityTracker.addMovement(ev); 1165 // Check if the scroller is finished yet 1166 mIsScrolling = !mSv.mScroller.isFinished(); 1167 break; 1168 } 1169 case MotionEvent.ACTION_MOVE: { 1170 if (mActivePointerId == INACTIVE_POINTER_ID) break; 1171 1172 int activePointerIndex = ev.findPointerIndex(mActivePointerId); 1173 int y = (int) ev.getY(activePointerIndex); 1174 int x = (int) ev.getX(activePointerIndex); 1175 if (Math.abs(y - mInitialMotionY) > mScrollTouchSlop) { 1176 // Save the touch move info 1177 mIsScrolling = true; 1178 // Initialize the velocity tracker if necessary 1179 initVelocityTrackerIfNotExists(); 1180 mVelocityTracker.addMovement(ev); 1181 // Disallow parents from intercepting touch events 1182 final ViewParent parent = mSv.getParent(); 1183 if (parent != null) { 1184 parent.requestDisallowInterceptTouchEvent(true); 1185 } 1186 // Enable HW layers 1187 mSv.addHwLayersRefCount("stackScroll"); 1188 } 1189 1190 mLastMotionX = x; 1191 mLastMotionY = y; 1192 break; 1193 } 1194 case MotionEvent.ACTION_CANCEL: 1195 case MotionEvent.ACTION_UP: { 1196 // Animate the scroll back if we've cancelled 1197 mSv.animateBoundScroll(); 1198 // Disable HW layers 1199 if (mIsScrolling) { 1200 mSv.decHwLayersRefCount("stackScroll"); 1201 } 1202 // Reset the drag state and the velocity tracker 1203 mIsScrolling = false; 1204 mActivePointerId = INACTIVE_POINTER_ID; 1205 mActiveTaskView = null; 1206 mTotalScrollMotion = 0; 1207 recycleVelocityTracker(); 1208 break; 1209 } 1210 } 1211 1212 return wasScrolling || mIsScrolling; 1213 } 1214 1215 /** Handles touch events once we have intercepted them */ 1216 public boolean onTouchEvent(MotionEvent ev) { 1217 Console.log(Constants.DebugFlags.UI.TouchEvents, 1218 "[TaskStackViewTouchHandler|touchEvent]", 1219 Console.motionEventActionToString(ev.getAction()), Console.AnsiBlue); 1220 1221 // Short circuit if we have no children 1222 boolean hasChildren = (mSv.getChildCount() > 0); 1223 if (!hasChildren) { 1224 return false; 1225 } 1226 1227 // Pass through to swipe helper if we are swiping 1228 if (mInterceptedBySwipeHelper && mSwipeHelper.onTouchEvent(ev)) { 1229 return true; 1230 } 1231 1232 // Update the velocity tracker 1233 initVelocityTrackerIfNotExists(); 1234 mVelocityTracker.addMovement(ev); 1235 1236 int action = ev.getAction(); 1237 switch (action & MotionEvent.ACTION_MASK) { 1238 case MotionEvent.ACTION_DOWN: { 1239 // Save the touch down info 1240 mInitialMotionX = mLastMotionX = (int) ev.getX(); 1241 mInitialMotionY = mLastMotionY = (int) ev.getY(); 1242 mActivePointerId = ev.getPointerId(0); 1243 mActiveTaskView = findViewAtPoint(mLastMotionX, mLastMotionY); 1244 // Stop the current scroll if it is still flinging 1245 mSv.abortScroller(); 1246 mSv.abortBoundScrollAnimation(); 1247 // Initialize the velocity tracker 1248 initOrResetVelocityTracker(); 1249 mVelocityTracker.addMovement(ev); 1250 // Disallow parents from intercepting touch events 1251 final ViewParent parent = mSv.getParent(); 1252 if (parent != null) { 1253 parent.requestDisallowInterceptTouchEvent(true); 1254 } 1255 break; 1256 } 1257 case MotionEvent.ACTION_POINTER_DOWN: { 1258 final int index = ev.getActionIndex(); 1259 mActivePointerId = ev.getPointerId(index); 1260 mLastMotionX = (int) ev.getX(index); 1261 mLastMotionY = (int) ev.getY(index); 1262 break; 1263 } 1264 case MotionEvent.ACTION_MOVE: { 1265 if (mActivePointerId == INACTIVE_POINTER_ID) break; 1266 1267 int activePointerIndex = ev.findPointerIndex(mActivePointerId); 1268 int x = (int) ev.getX(activePointerIndex); 1269 int y = (int) ev.getY(activePointerIndex); 1270 int yTotal = Math.abs(y - mInitialMotionY); 1271 int deltaY = mLastMotionY - y; 1272 if (!mIsScrolling) { 1273 if (yTotal > mScrollTouchSlop) { 1274 mIsScrolling = true; 1275 // Initialize the velocity tracker 1276 initOrResetVelocityTracker(); 1277 mVelocityTracker.addMovement(ev); 1278 // Disallow parents from intercepting touch events 1279 final ViewParent parent = mSv.getParent(); 1280 if (parent != null) { 1281 parent.requestDisallowInterceptTouchEvent(true); 1282 } 1283 // Enable HW layers 1284 mSv.addHwLayersRefCount("stackScroll"); 1285 } 1286 } 1287 if (mIsScrolling) { 1288 int curStackScroll = mSv.getStackScroll(); 1289 if (mSv.isScrollOutOfBounds(curStackScroll + deltaY)) { 1290 // Scale the touch if we are overscrolling 1291 deltaY /= Constants.Values.TaskStackView.TouchOverscrollScaleFactor; 1292 } 1293 mSv.setStackScroll(curStackScroll + deltaY); 1294 if (mSv.isScrollOutOfBounds()) { 1295 mVelocityTracker.clear(); 1296 } 1297 } 1298 mLastMotionX = x; 1299 mLastMotionY = y; 1300 mTotalScrollMotion += Math.abs(deltaY); 1301 break; 1302 } 1303 case MotionEvent.ACTION_UP: { 1304 final VelocityTracker velocityTracker = mVelocityTracker; 1305 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 1306 int velocity = (int) velocityTracker.getYVelocity(mActivePointerId); 1307 1308 if (mIsScrolling && (Math.abs(velocity) > mMinimumVelocity)) { 1309 // Enable HW layers on the stack 1310 mSv.addHwLayersRefCount("flingScroll"); 1311 int overscrollRange = (int) (Math.min(1f, 1312 Math.abs((float) velocity / mMaximumVelocity)) * 1313 Constants.Values.TaskStackView.TaskStackOverscrollRange); 1314 1315 Console.log(Constants.DebugFlags.UI.TouchEvents, 1316 "[TaskStackViewTouchHandler|fling]", 1317 "scroll: " + mSv.getStackScroll() + " velocity: " + velocity + 1318 " maxVelocity: " + mMaximumVelocity + 1319 " overscrollRange: " + overscrollRange, 1320 Console.AnsiGreen); 1321 1322 // Fling scroll 1323 mSv.mScroller.fling(0, mSv.getStackScroll(), 1324 0, -velocity, 1325 0, 0, 1326 mSv.mMinScroll, mSv.mMaxScroll, 1327 0, overscrollRange); 1328 // Invalidate to kick off computeScroll 1329 mSv.invalidate(); 1330 } else if (mSv.isScrollOutOfBounds()) { 1331 // Animate the scroll back into bounds 1332 // XXX: Make this animation a function of the velocity OR distance 1333 mSv.animateBoundScroll(); 1334 } 1335 1336 if (mIsScrolling) { 1337 // Disable HW layers 1338 mSv.decHwLayersRefCount("stackScroll"); 1339 } 1340 mActivePointerId = INACTIVE_POINTER_ID; 1341 mIsScrolling = false; 1342 mTotalScrollMotion = 0; 1343 recycleVelocityTracker(); 1344 break; 1345 } 1346 case MotionEvent.ACTION_POINTER_UP: { 1347 int pointerIndex = ev.getActionIndex(); 1348 int pointerId = ev.getPointerId(pointerIndex); 1349 if (pointerId == mActivePointerId) { 1350 // Select a new active pointer id and reset the motion state 1351 final int newPointerIndex = (pointerIndex == 0) ? 1 : 0; 1352 mActivePointerId = ev.getPointerId(newPointerIndex); 1353 mLastMotionX = (int) ev.getX(newPointerIndex); 1354 mLastMotionY = (int) ev.getY(newPointerIndex); 1355 mVelocityTracker.clear(); 1356 } 1357 break; 1358 } 1359 case MotionEvent.ACTION_CANCEL: { 1360 if (mIsScrolling) { 1361 // Disable HW layers 1362 mSv.decHwLayersRefCount("stackScroll"); 1363 } 1364 if (mSv.isScrollOutOfBounds()) { 1365 // Animate the scroll back into bounds 1366 // XXX: Make this animation a function of the velocity OR distance 1367 mSv.animateBoundScroll(); 1368 } 1369 mActivePointerId = INACTIVE_POINTER_ID; 1370 mIsScrolling = false; 1371 mTotalScrollMotion = 0; 1372 recycleVelocityTracker(); 1373 break; 1374 } 1375 } 1376 return true; 1377 } 1378 1379 /**** SwipeHelper Implementation ****/ 1380 1381 @Override 1382 public View getChildAtPosition(MotionEvent ev) { 1383 return findViewAtPoint((int) ev.getX(), (int) ev.getY()); 1384 } 1385 1386 @Override 1387 public boolean canChildBeDismissed(View v) { 1388 return true; 1389 } 1390 1391 @Override 1392 public void onBeginDrag(View v) { 1393 // Enable HW layers 1394 mSv.addHwLayersRefCount("swipeBegin"); 1395 // Disallow parents from intercepting touch events 1396 final ViewParent parent = mSv.getParent(); 1397 if (parent != null) { 1398 parent.requestDisallowInterceptTouchEvent(true); 1399 } 1400 // If the info panel is currently showing on this view, then we need to dismiss it 1401 if (Constants.DebugFlags.App.EnableInfoPane) { 1402 TaskView tv = (TaskView) v; 1403 if (tv.isInfoPaneVisible()) { 1404 tv.hideInfoPane(); 1405 } 1406 } 1407 } 1408 1409 @Override 1410 public void onChildDismissed(View v) { 1411 TaskView tv = (TaskView) v; 1412 Task task = tv.getTask(); 1413 Activity activity = (Activity) mSv.getContext(); 1414 1415 // Remove the task from the view 1416 mSv.mStack.removeTask(task); 1417 1418 // Remove any stored data from the loader 1419 RecentsTaskLoader loader = RecentsTaskLoader.getInstance(); 1420 loader.deleteTaskData(task); 1421 1422 // Remove the task from activity manager 1423 RecentsTaskLoader.getInstance().getSystemServicesProxy().removeTask(tv.getTask().key.id); 1424 1425 // If there are no remaining tasks, then either unfilter the current stack, or just close 1426 // the activity if there are no filtered stacks 1427 if (mSv.mStack.getTaskCount() == 0) { 1428 boolean shouldFinishActivity = true; 1429 if (mSv.mStack.hasFilteredTasks()) { 1430 mSv.mStack.unfilterTasks(); 1431 shouldFinishActivity = (mSv.mStack.getTaskCount() == 0); 1432 } 1433 if (shouldFinishActivity) { 1434 activity.finish(); 1435 } 1436 } 1437 1438 // Disable HW layers 1439 mSv.decHwLayersRefCount("swipeComplete"); 1440 } 1441 1442 @Override 1443 public void onSnapBackCompleted(View v) { 1444 // Do Nothing 1445 } 1446 1447 @Override 1448 public void onDragCancelled(View v) { 1449 // Disable HW layers 1450 mSv.decHwLayersRefCount("swipeCancelled"); 1451 } 1452} 1453