/** 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);
}