@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();
}
}
}
/** 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());
}
}
});
}
}
/** Handler for the first layout. */
void onFirstLayout() {
int offscreenY =
mLayoutAlgorithm.mViewRect.bottom
- (mLayoutAlgorithm.mTaskRect.top - mLayoutAlgorithm.mViewRect.top);
// 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;
}
}
// Prepare the first view for its enter animation
for (int i = childCount - 1; i >= 0; i--) {
TaskView tv = (TaskView) getChildAt(i);
Task task = tv.getTask();
boolean occludesLaunchTarget =
(launchTargetTask != null)
&& launchTargetTask.group.isTaskAboveTask(task, launchTargetTask);
tv.prepareEnterRecentsAnimation(task.isLaunchTarget, occludesLaunchTarget, offscreenY);
}
// If the enter animation started already and we haven't completed a layout yet, do the
// enter animation now
if (mStartEnterAnimationRequestedAfterLayout) {
startEnterRecentsAnimation(mStartEnterAnimationContext);
mStartEnterAnimationRequestedAfterLayout = false;
mStartEnterAnimationContext = null;
}
// When Alt-Tabbing, we scroll to and focus the previous task
if (mConfig.launchedWithAltTab) {
if (mConfig.launchedFromHome) {
focusTask(Math.max(0, mStack.getTaskCount() - 1), false);
} else {
focusTask(Math.max(0, mStack.getTaskCount() - 2), false);
}
}
}
/** Focuses the next task in the stack */
void focusNextTask(boolean forward) {
// Find the next index to focus
int numTasks = mStack.getTaskCount();
if (numTasks == 0) return;
int nextFocusIndex = numTasks - 1;
if (0 <= mFocusedTaskIndex && mFocusedTaskIndex < numTasks) {
nextFocusIndex = Math.max(0, Math.min(numTasks - 1, mFocusedTaskIndex + (forward ? -1 : 1)));
}
focusTask(nextFocusIndex, true);
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
int childCount = getChildCount();
if (childCount > 0) {
TaskView backMostTask = (TaskView) getChildAt(0);
TaskView frontMostTask = (TaskView) getChildAt(childCount - 1);
event.setFromIndex(mStack.indexOfTask(backMostTask.getTask()));
event.setToIndex(mStack.indexOfTask(frontMostTask.getTask()));
event.setContentDescription(frontMostTask.getTask().activityLabel);
}
event.setItemCount(mStack.getTaskCount());
event.setScrollY(mStackScroller.mScroller.getCurrY());
event.setMaxScrollY(mStackScroller.progressToScrollRange(mLayoutAlgorithm.mMaxScrollP));
}
void preloadRecentsInternal() {
// Preload only the raw task list into a new load plan (which will be consumed by the
// RecentsActivity) only if there is a task to animate to.
ActivityManager.RunningTaskInfo topTask = mSystemServicesProxy.getTopMostTask();
MutableBoolean topTaskHome = new MutableBoolean(true);
RecentsTaskLoader loader = RecentsTaskLoader.getInstance();
sInstanceLoadPlan = loader.createLoadPlan(mContext);
if (topTask != null && !mSystemServicesProxy.isRecentsTopMost(topTask, topTaskHome)) {
sInstanceLoadPlan.preloadRawTasks(topTaskHome.value);
loader.preloadTasks(sInstanceLoadPlan, topTaskHome.value);
TaskStack top = sInstanceLoadPlan.getAllTaskStacks().get(0);
if (top.getTaskCount() > 0) {
preCacheThumbnailTransitionBitmapAsync(topTask, top, mDummyStackView, topTaskHome.value);
}
}
}
/** 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();
}
}
}
}
/** ** TaskStackView.TaskStackCallbacks Implementation *** */
@Override
public void onTaskViewClicked(
final TaskStackView stackView,
final TaskView tv,
final TaskStack stack,
final Task task,
final boolean lockToTask) {
Log.d(TAG, "onTaskViewClicked: ");
// Notify any callbacks of the launching of a new task
if (mCb != null) {
mCb.onTaskViewClicked();
}
// Upfront the processing of the thumbnail
TaskViewTransform transform = new TaskViewTransform();
View sourceView;
int offsetX = 0;
int offsetY = 0;
float stackScroll = stackView.getScroller().getStackScroll();
if (tv == null) {
// If there is no actual task view, then use the stack view as the source view
// and then offset to the expected transform rect, but bound this to just
// outside the display rect (to ensure we don't animate from too far away)
sourceView = stackView;
transform =
stackView.getStackAlgorithm().getStackTransform(task, stackScroll, transform, null);
offsetX = transform.rect.left;
offsetY = mConfig.displayRect.height();
} else {
sourceView = tv.mThumbnailView;
transform =
stackView.getStackAlgorithm().getStackTransform(task, stackScroll, transform, null);
}
// Compute the thumbnail to scale up from
final SystemServicesProxy ssp = RecentsTaskLoader.getInstance().getSystemServicesProxy();
ActivityOptions opts = null;
if (task.thumbnail != null && task.thumbnail.getWidth() > 0 && task.thumbnail.getHeight() > 0) {
ActivityOptions.OnAnimationStartedListener animStartedListener = null;
if (lockToTask) {
animStartedListener =
new ActivityOptions.OnAnimationStartedListener() {
boolean mTriggered = false;
@Override
public void onAnimationStarted() {
if (!mTriggered) {
postDelayed(
new Runnable() {
@Override
public void run() {
mCb.onScreenPinningRequest();
}
},
350);
mTriggered = true;
}
}
};
}
if (tv != null) {
postDrawHeaderThumbnailTransitionRunnable(
tv, offsetX, offsetY, transform, animStartedListener);
}
if (mConfig.multiStackEnabled) {
opts =
ActivityOptions.makeCustomAnimation(
sourceView.getContext(),
R.anim.recents_from_unknown_enter,
R.anim.recents_from_unknown_exit,
sourceView.getHandler(),
animStartedListener);
} else {
opts =
ActivityOptions.makeThumbnailAspectScaleUpAnimation(
sourceView,
Bitmap.createBitmap(1, 1, Bitmap.Config.ALPHA_8).createAshmemBitmap(),
offsetX,
offsetY,
transform.rect.width(),
transform.rect.height(),
sourceView.getHandler(),
animStartedListener);
}
}
final ActivityOptions launchOpts = opts;
final Runnable launchRunnable =
new Runnable() {
@Override
public void run() {
if (task.isActive) {
// Bring an active task to the foreground
ssp.moveTaskToFront(task.key.id, launchOpts);
} else {
if (ssp.startActivityFromRecents(
getContext(), task.key.id, task.activityLabel, launchOpts)) {
if (launchOpts == null && lockToTask) {
mCb.onScreenPinningRequest();
}
} else {
// Dismiss the task and return the user to home if we fail to
// launch the task
onTaskViewDismissed(task);
if (mCb != null) {
mCb.onTaskLaunchFailed();
}
// Keep track of failed launches
MetricsLogger.count(getContext(), "overview_task_launch_failed", 1);
}
}
}
};
// Keep track of the index of the task launch
int taskIndexFromFront = 0;
int taskIndex = stack.indexOfTask(task);
if (taskIndex > -1) {
taskIndexFromFront = stack.getTaskCount() - taskIndex - 1;
}
MetricsLogger.histogram(getContext(), "overview_task_launch_index", taskIndexFromFront);
// Launch the app right away if there is no task view, otherwise, animate the icon out first
if (tv == null) {
launchRunnable.run();
} else {
if (task.group != null && !task.group.isFrontMostTask(task)) {
// For affiliated tasks that are behind other tasks, we must animate the front cards
// out of view before starting the task transition
stackView.startLaunchTaskAnimation(tv, launchRunnable, lockToTask);
} else {
// Otherwise, we can start the task transition immediately
stackView.startLaunchTaskAnimation(tv, null, lockToTask);
launchRunnable.run();
}
}
}
/** Starts the recents activity */
void startRecentsActivity(ActivityManager.RunningTaskInfo topTask, boolean isTopTaskHome) {
RecentsTaskLoader loader = RecentsTaskLoader.getInstance();
RecentsConfiguration.reinitialize(mContext, mSystemServicesProxy);
if (sInstanceLoadPlan == null) {
// Create a new load plan if onPreloadRecents() was never triggered
sInstanceLoadPlan = loader.createLoadPlan(mContext);
}
// Temporarily skip the transition (use a dummy fade) if multi stack is enabled.
// For multi-stack we need to figure out where each of the tasks are going.
if (mConfig.multiStackEnabled) {
loader.preloadTasks(sInstanceLoadPlan, true);
ArrayList<TaskStack> stacks = sInstanceLoadPlan.getAllTaskStacks();
TaskStack stack = stacks.get(0);
mDummyStackView.updateMinMaxScrollForStack(stack, mTriggeredFromAltTab, true);
TaskStackViewLayoutAlgorithm.VisibilityReport stackVr =
mDummyStackView.computeStackVisibilityReport();
ActivityOptions opts = getUnknownTransitionActivityOptions();
startAlternateRecentsActivity(
topTask,
opts,
true /* fromHome */,
false /* fromSearchHome */,
false /* fromThumbnail */,
stackVr);
return;
}
if (!sInstanceLoadPlan.hasTasks()) {
loader.preloadTasks(sInstanceLoadPlan, isTopTaskHome);
}
ArrayList<TaskStack> stacks = sInstanceLoadPlan.getAllTaskStacks();
TaskStack stack = stacks.get(0);
// Prepare the dummy stack for the transition
mDummyStackView.updateMinMaxScrollForStack(stack, mTriggeredFromAltTab, isTopTaskHome);
TaskStackViewLayoutAlgorithm.VisibilityReport stackVr =
mDummyStackView.computeStackVisibilityReport();
boolean hasRecentTasks = stack.getTaskCount() > 0;
boolean useThumbnailTransition = (topTask != null) && !isTopTaskHome && hasRecentTasks;
if (useThumbnailTransition) {
// Try starting with a thumbnail transition
ActivityOptions opts = getThumbnailTransitionActivityOptions(topTask, stack, mDummyStackView);
if (opts != null) {
startAlternateRecentsActivity(
topTask,
opts,
false /* fromHome */,
false /* fromSearchHome */,
true /* fromThumbnail */,
stackVr);
} else {
// Fall through below to the non-thumbnail transition
useThumbnailTransition = false;
}
}
if (!useThumbnailTransition) {
// If there is no thumbnail transition, but is launching from home into recents, then
// use a quick home transition and do the animation from home
if (hasRecentTasks) {
String homeActivityPackage = mSystemServicesProxy.getHomeActivityPackageName();
String searchWidgetPackage =
Prefs.getString(mContext, Prefs.Key.SEARCH_APP_WIDGET_PACKAGE, null);
// Determine whether we are coming from a search owned home activity
boolean fromSearchHome =
(homeActivityPackage != null) && homeActivityPackage.equals(searchWidgetPackage);
ActivityOptions opts = getHomeTransitionActivityOptions(fromSearchHome);
startAlternateRecentsActivity(
topTask, opts, true /* fromHome */, fromSearchHome, false /* fromThumbnail */, stackVr);
} else {
// Otherwise we do the normal fade from an unknown source
ActivityOptions opts = getUnknownTransitionActivityOptions();
startAlternateRecentsActivity(
topTask,
opts,
true /* fromHome */,
false /* fromSearchHome */,
false /* fromThumbnail */,
stackVr);
}
}
mLastToggleTime = SystemClock.elapsedRealtime();
}
void showRelativeAffiliatedTask(boolean showNextTask) {
// Return early if there is no focused stack
int focusedStackId = mSystemServicesProxy.getFocusedStack();
TaskStack focusedStack = null;
RecentsTaskLoader loader = RecentsTaskLoader.getInstance();
RecentsTaskLoadPlan plan = loader.createLoadPlan(mContext);
loader.preloadTasks(plan, true /* isTopTaskHome */);
if (mConfig.multiStackEnabled) {
if (focusedStackId < 0) return;
focusedStack = plan.getTaskStack(focusedStackId);
} else {
focusedStack = plan.getAllTaskStacks().get(0);
}
// Return early if there are no tasks in the focused stack
if (focusedStack == null || focusedStack.getTaskCount() == 0) return;
ActivityManager.RunningTaskInfo runningTask = mSystemServicesProxy.getTopMostTask();
// Return early if there is no running task (can't determine affiliated tasks in this case)
if (runningTask == null) return;
// Return early if the running task is in the home stack (optimization)
if (mSystemServicesProxy.isInHomeStack(runningTask.id)) return;
// Find the task in the recents list
ArrayList<Task> tasks = focusedStack.getTasks();
Task toTask = null;
ActivityOptions launchOpts = null;
int taskCount = tasks.size();
int numAffiliatedTasks = 0;
for (int i = 0; i < taskCount; i++) {
Task task = tasks.get(i);
if (task.key.id == runningTask.id) {
TaskGrouping group = task.group;
Task.TaskKey toTaskKey;
if (showNextTask) {
toTaskKey = group.getNextTaskInGroup(task);
launchOpts =
ActivityOptions.makeCustomAnimation(
mContext,
R.anim.recents_launch_next_affiliated_task_target,
R.anim.recents_launch_next_affiliated_task_source);
} else {
toTaskKey = group.getPrevTaskInGroup(task);
launchOpts =
ActivityOptions.makeCustomAnimation(
mContext,
R.anim.recents_launch_prev_affiliated_task_target,
R.anim.recents_launch_prev_affiliated_task_source);
}
if (toTaskKey != null) {
toTask = focusedStack.findTaskWithId(toTaskKey.id);
}
numAffiliatedTasks = group.getTaskCount();
break;
}
}
// Return early if there is no next task
if (toTask == null) {
if (numAffiliatedTasks > 1) {
if (showNextTask) {
mSystemServicesProxy.startInPlaceAnimationOnFrontMostApplication(
ActivityOptions.makeCustomInPlaceAnimation(
mContext, R.anim.recents_launch_next_affiliated_task_bounce));
} else {
mSystemServicesProxy.startInPlaceAnimationOnFrontMostApplication(
ActivityOptions.makeCustomInPlaceAnimation(
mContext, R.anim.recents_launch_prev_affiliated_task_bounce));
}
}
return;
}
// Keep track of actually launched affiliated tasks
MetricsLogger.count(mContext, "overview_affiliated_task_launch", 1);
// Launch the task
if (toTask.isActive) {
// Bring an active task to the foreground
mSystemServicesProxy.moveTaskToFront(toTask.key.id, launchOpts);
} else {
mSystemServicesProxy.startActivityFromRecents(
mContext, toTask.key.id, toTask.activityLabel, launchOpts);
}
}