@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();
}
}
}
/** 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();
}
}
}
}