@Override
public void onStackTaskRemoved(TaskStack stack, Task removedTask, Task newFrontMostTask) {
// Remove the view associated with this task, we can't rely on updateTransforms
// to work here because the task is no longer in the list
TaskView tv = getChildViewForTask(removedTask);
if (tv != null) {
mViewPool.returnViewToPool(tv);
}
// Notify the callback that we've removed the task and it can clean up after it
mCb.onTaskViewDismissed(removedTask);
// Get the stack scroll of the task to anchor to (since we are removing something, the front
// most task will be our anchor task)
Task anchorTask = null;
float prevAnchorTaskScroll = 0;
boolean pullStackForward = stack.getTaskCount() > 0;
if (pullStackForward) {
anchorTask = mStack.getFrontMostTask();
prevAnchorTaskScroll = mLayoutAlgorithm.getStackScrollForTask(anchorTask);
}
// Update the min/max scroll and animate other task views into their new positions
updateMinMaxScroll(true, mConfig.launchedWithAltTab, mConfig.launchedFromHome);
// Offset the stack by as much as the anchor task would otherwise move back
if (pullStackForward) {
float anchorTaskScroll = mLayoutAlgorithm.getStackScrollForTask(anchorTask);
mStackScroller.setStackScroll(
mStackScroller.getStackScroll() + (anchorTaskScroll - prevAnchorTaskScroll));
mStackScroller.boundScroll();
}
// Animate all the tasks into place
requestSynchronizeStackViewsWithModel(200);
// Update the new front most task
if (newFrontMostTask != null) {
TaskView frontTv = getChildViewForTask(newFrontMostTask);
if (frontTv != null) {
frontTv.onTaskBound(newFrontMostTask);
}
}
// If there are no remaining tasks, then either unfilter the current stack, or just close
// the activity if there are no filtered stacks
if (mStack.getTaskCount() == 0) {
boolean shouldFinishActivity = true;
if (mStack.hasFilteredTasks()) {
mStack.unfilterTasks();
shouldFinishActivity = (mStack.getTaskCount() == 0);
}
if (shouldFinishActivity) {
mCb.onAllTaskViewsDismissed();
}
}
}
/** Prepares the header bar layout. */
void reloadHeaderBarLayout() {
Resources res = mContext.getResources();
mWindowRect = mSystemServicesProxy.getWindowRect();
mStatusBarHeight = res.getDimensionPixelSize(com.android.internal.R.dimen.status_bar_height);
mNavBarHeight = res.getDimensionPixelSize(com.android.internal.R.dimen.navigation_bar_height);
mNavBarWidth = res.getDimensionPixelSize(com.android.internal.R.dimen.navigation_bar_width);
mConfig = RecentsConfiguration.reinitialize(mContext, mSystemServicesProxy);
mConfig.updateOnConfigurationChange();
Rect searchBarBounds = new Rect();
// Try and pre-emptively bind the search widget on startup to ensure that we
// have the right thumbnail bounds to animate to.
// Note: We have to reload the widget id before we get the task stack bounds below
if (mSystemServicesProxy.getOrBindSearchAppWidget(mContext, mAppWidgetHost) != null) {
mConfig.getSearchBarBounds(
mWindowRect.width(), mWindowRect.height(), mStatusBarHeight, searchBarBounds);
}
mConfig.getAvailableTaskStackBounds(
mWindowRect.width(),
mWindowRect.height(),
mStatusBarHeight,
(mConfig.hasTransposedNavBar ? mNavBarWidth : 0),
searchBarBounds,
mTaskStackBounds);
if (mConfig.isLandscape && mConfig.hasTransposedNavBar) {
mSystemInsets.set(0, mStatusBarHeight, mNavBarWidth, 0);
} else {
mSystemInsets.set(0, mStatusBarHeight, 0, mNavBarHeight);
}
// Inflate the header bar layout so that we can rebind and draw it for the transition
TaskStack stack = new TaskStack();
mDummyStackView = new TaskStackView(mContext, stack);
TaskStackViewLayoutAlgorithm algo = mDummyStackView.getStackAlgorithm();
Rect taskStackBounds = new Rect(mTaskStackBounds);
taskStackBounds.bottom -= mSystemInsets.bottom;
algo.computeRects(mWindowRect.width(), mWindowRect.height(), taskStackBounds);
Rect taskViewSize = algo.getUntransformedTaskViewSize();
int taskBarHeight = res.getDimensionPixelSize(R.dimen.recents_task_bar_height);
synchronized (mHeaderBarLock) {
mHeaderBar =
(TaskViewHeader) mInflater.inflate(R.layout.recents_task_view_header, null, false);
mHeaderBar.measure(
View.MeasureSpec.makeMeasureSpec(taskViewSize.width(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(taskBarHeight, View.MeasureSpec.EXACTLY));
mHeaderBar.layout(0, 0, taskViewSize.width(), taskBarHeight);
}
}
/** Requests this task stacks to start it's enter-recents animation */
public void startEnterRecentsAnimation(ViewAnimation.TaskViewEnterContext ctx) {
// If we are still waiting to layout, then just defer until then
if (mAwaitingFirstLayout) {
mStartEnterAnimationRequestedAfterLayout = true;
mStartEnterAnimationContext = ctx;
return;
}
if (mStack.getTaskCount() > 0) {
// Find the launch target task
Task launchTargetTask = null;
int childCount = getChildCount();
for (int i = childCount - 1; i >= 0; i--) {
TaskView tv = (TaskView) getChildAt(i);
Task task = tv.getTask();
if (task.isLaunchTarget) {
launchTargetTask = task;
break;
}
}
// Animate all the task views into view
for (int i = childCount - 1; i >= 0; i--) {
TaskView tv = (TaskView) getChildAt(i);
Task task = tv.getTask();
ctx.currentTaskTransform = new TaskViewTransform();
ctx.currentStackViewIndex = i;
ctx.currentStackViewCount = childCount;
ctx.currentTaskRect = mLayoutAlgorithm.mTaskRect;
ctx.currentTaskOccludesLaunchTarget =
(launchTargetTask != null)
&& launchTargetTask.group.isTaskAboveTask(task, launchTargetTask);
ctx.updateListener = mRequestUpdateClippingListener;
mLayoutAlgorithm.getStackTransform(
task, mStackScroller.getStackScroll(), ctx.currentTaskTransform, null);
tv.startEnterRecentsAnimation(ctx);
}
// Add a runnable to the post animation ref counter to clear all the views
ctx.postAnimationTrigger.addLastDecrementRunnable(
new Runnable() {
@Override
public void run() {
mStartEnterAnimationCompleted = true;
// Start dozing
mUIDozeTrigger.startDozing();
// Focus the first view if accessibility is enabled
RecentsTaskLoader loader = RecentsTaskLoader.getInstance();
SystemServicesProxy ssp = loader.getSystemServicesProxy();
int childCount = getChildCount();
if (childCount > 0 && ssp.isTouchExplorationEnabled()) {
TaskView tv = ((TaskView) getChildAt(childCount - 1));
tv.requestAccessibilityFocus();
mPrevAccessibilityFocusedIndex = mStack.indexOfTask(tv.getTask());
}
}
});
}
}
/** Updates the min and max virtual scroll bounds */
void updateMinMaxScroll(
boolean boundScrollToNewMinMax, boolean launchedWithAltTab, boolean launchedFromHome) {
// Compute the min and max scroll values
mLayoutAlgorithm.computeMinMaxScroll(mStack.getTasks(), launchedWithAltTab, launchedFromHome);
// Debug logging
if (boundScrollToNewMinMax) {
mStackScroller.boundScroll();
}
}
/** Computes the stack and task rects */
public void computeRects(
int windowWidth,
int windowHeight,
Rect taskStackBounds,
boolean launchedWithAltTab,
boolean launchedFromHome) {
// Compute the rects in the stack algorithm
mLayoutAlgorithm.computeRects(windowWidth, windowHeight, taskStackBounds);
// Update the scroll bounds
updateMinMaxScroll(false, launchedWithAltTab, launchedFromHome);
}
/** Initializes the Recents. */
@ProxyFromPrimaryToCurrentUser
@Override
public void start() {
if (sInstance == null) {
sInstance = this;
}
RecentsTaskLoader.initialize(mContext);
mInflater = LayoutInflater.from(mContext);
mSystemServicesProxy = new SystemServicesProxy(mContext);
mHandler = new Handler();
mTaskStackBounds = new Rect();
mAppWidgetHost = new RecentsAppWidgetHost(mContext, Constants.Values.App.AppWidgetHostId);
// Register the task stack listener
mTaskStackListener = new TaskStackListenerImpl(mHandler);
mSystemServicesProxy.registerTaskStackListener(mTaskStackListener);
// Only the owner has the callback to update the SysUI visibility flags, so all non-owner
// instances of AlternateRecentsComponent needs to notify the owner when the visibility
// changes.
if (mSystemServicesProxy.isForegroundUserOwner()) {
mProxyBroadcastReceiver = new RecentsOwnerEventProxyReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(Recents.ACTION_PROXY_NOTIFY_RECENTS_VISIBLITY_TO_OWNER);
filter.addAction(Recents.ACTION_PROXY_SCREEN_PINNING_REQUEST_TO_OWNER);
mContext.registerReceiverAsUser(
mProxyBroadcastReceiver, UserHandle.CURRENT, filter, null, mHandler);
}
// Initialize some static datastructures
TaskStackViewLayoutAlgorithm.initializeCurve();
// Load the header bar layout
reloadHeaderBarLayout();
// When we start, preload the data associated with the previous recent tasks.
// We can use a new plan since the caches will be the same.
RecentsTaskLoader loader = RecentsTaskLoader.getInstance();
RecentsTaskLoadPlan plan = loader.createLoadPlan(mContext);
loader.preloadTasks(plan, true /* isTopTaskHome */);
RecentsTaskLoadPlan.Options launchOpts = new RecentsTaskLoadPlan.Options();
launchOpts.numVisibleTasks = loader.getApplicationIconCacheSize();
launchOpts.numVisibleTaskThumbnails = loader.getThumbnailCacheSize();
launchOpts.onlyLoadForCache = true;
loader.loadTasks(mContext, plan, launchOpts);
putComponent(Recents.class, this);
}
/** Focuses the task at the specified index in the stack */
void focusTask(int taskIndex, boolean scrollToNewPosition) {
// Return early if the task is already focused
if (taskIndex == mFocusedTaskIndex) return;
if (0 <= taskIndex && taskIndex < mStack.getTaskCount()) {
mFocusedTaskIndex = taskIndex;
// Focus the view if possible, otherwise, focus the view after we scroll into position
Task t = mStack.getTasks().get(taskIndex);
TaskView tv = getChildViewForTask(t);
Runnable postScrollRunnable = null;
if (tv != null) {
tv.setFocusedTask();
} else {
postScrollRunnable =
new Runnable() {
@Override
public void run() {
Task t = mStack.getTasks().get(mFocusedTaskIndex);
TaskView tv = getChildViewForTask(t);
if (tv != null) {
tv.setFocusedTask();
}
}
};
}
// Scroll the view into position (just center it in the curve)
if (scrollToNewPosition) {
float newScroll = mLayoutAlgorithm.getStackScrollForTask(t) - 0.5f;
newScroll = mStackScroller.getBoundedStackScroll(newScroll);
mStackScroller.animateScroll(
mStackScroller.getStackScroll(), newScroll, postScrollRunnable);
} else {
if (postScrollRunnable != null) {
postScrollRunnable.run();
}
}
}
}
/** Synchronizes the views with the model */
boolean synchronizeStackViewsWithModel() {
if (mStackViewsDirty) {
RecentsTaskLoader loader = RecentsTaskLoader.getInstance();
SystemServicesProxy ssp = loader.getSystemServicesProxy();
// Get all the task transforms
ArrayList<Task> tasks = mStack.getTasks();
float stackScroll = mStackScroller.getStackScroll();
int[] visibleRange = mTmpVisibleRange;
boolean isValidVisibleRange =
updateStackTransforms(mCurrentTaskTransforms, tasks, stackScroll, visibleRange, false);
if (mDebugOverlay != null) {
mDebugOverlay.setText("vis[" + visibleRange[1] + "-" + visibleRange[0] + "]");
}
// Return all the invisible children to the pool
mTmpTaskViewMap.clear();
int childCount = getChildCount();
for (int i = childCount - 1; i >= 0; i--) {
TaskView tv = (TaskView) getChildAt(i);
Task task = tv.getTask();
int taskIndex = mStack.indexOfTask(task);
if (visibleRange[1] <= taskIndex && taskIndex <= visibleRange[0]) {
mTmpTaskViewMap.put(task, tv);
} else {
mViewPool.returnViewToPool(tv);
}
}
// Pick up all the newly visible children and update all the existing children
for (int i = visibleRange[0]; isValidVisibleRange && i >= visibleRange[1]; i--) {
Task task = tasks.get(i);
TaskViewTransform transform = mCurrentTaskTransforms.get(i);
TaskView tv = mTmpTaskViewMap.get(task);
int taskIndex = mStack.indexOfTask(task);
if (tv == null) {
tv = mViewPool.pickUpViewFromPool(task, task);
if (mStackViewsAnimationDuration > 0) {
// For items in the list, put them in start animating them from the
// approriate ends of the list where they are expected to appear
if (Float.compare(transform.p, 0f) <= 0) {
mLayoutAlgorithm.getStackTransform(0f, 0f, mTmpTransform, null);
} else {
mLayoutAlgorithm.getStackTransform(1f, 0f, mTmpTransform, null);
}
tv.updateViewPropertiesToTaskTransform(mTmpTransform, 0);
}
}
// Animate the task into place
tv.updateViewPropertiesToTaskTransform(
mCurrentTaskTransforms.get(taskIndex),
mStackViewsAnimationDuration,
mRequestUpdateClippingListener);
// Request accessibility focus on the next view if we removed the task
// that previously held accessibility focus
childCount = getChildCount();
if (childCount > 0 && ssp.isTouchExplorationEnabled()) {
TaskView atv = (TaskView) getChildAt(childCount - 1);
int indexOfTask = mStack.indexOfTask(atv.getTask());
if (mPrevAccessibilityFocusedIndex != indexOfTask) {
tv.requestAccessibilityFocus();
mPrevAccessibilityFocusedIndex = indexOfTask;
}
}
}
// Reset the request-synchronize params
mStackViewsAnimationDuration = 0;
mStackViewsDirty = false;
mStackViewsClipDirty = true;
return true;
}
return false;
}
/** Gets the stack transforms of a list of tasks, and returns the visible range of tasks. */
private boolean updateStackTransforms(
ArrayList<TaskViewTransform> taskTransforms,
ArrayList<Task> tasks,
float stackScroll,
int[] visibleRangeOut,
boolean boundTranslationsToRect) {
// XXX: We should be intelligent about where to look for the visible stack range using the
// current stack scroll.
// XXX: We should log extra cases like the ones below where we don't expect to hit very often
// XXX: Print out approximately how many indices we have to go through to find the first visible
// transform
int taskTransformCount = taskTransforms.size();
int taskCount = tasks.size();
int frontMostVisibleIndex = -1;
int backMostVisibleIndex = -1;
// We can reuse the task transforms where possible to reduce object allocation
if (taskTransformCount < taskCount) {
// If there are less transforms than tasks, then add as many transforms as necessary
for (int i = taskTransformCount; i < taskCount; i++) {
taskTransforms.add(new TaskViewTransform());
}
} else if (taskTransformCount > taskCount) {
// If there are more transforms than tasks, then just subset the transform list
taskTransforms.subList(0, taskCount);
}
// Update the stack transforms
TaskViewTransform prevTransform = null;
for (int i = taskCount - 1; i >= 0; i--) {
TaskViewTransform transform =
mLayoutAlgorithm.getStackTransform(
tasks.get(i), stackScroll, taskTransforms.get(i), prevTransform);
if (transform.visible) {
if (frontMostVisibleIndex < 0) {
frontMostVisibleIndex = i;
}
backMostVisibleIndex = i;
} else {
if (backMostVisibleIndex != -1) {
// We've reached the end of the visible range, so going down the rest of the
// stack, we can just reset the transforms accordingly
while (i >= 0) {
taskTransforms.get(i).reset();
i--;
}
break;
}
}
if (boundTranslationsToRect) {
transform.translationY =
Math.min(transform.translationY, mLayoutAlgorithm.mViewRect.bottom);
}
prevTransform = transform;
}
if (visibleRangeOut != null) {
visibleRangeOut[0] = frontMostVisibleIndex;
visibleRangeOut[1] = backMostVisibleIndex;
}
return frontMostVisibleIndex != -1 && backMostVisibleIndex != -1;
}