/** Focuses the task at the specified index in the stack */
void focusTask(int childIndex, boolean scrollToNewPosition, final boolean animateFocusedState) {
// Return early if the task is already focused
if (childIndex == mFocusedTaskIndex) return;
ArrayList<T> data = mCallback.getData();
if (0 <= childIndex && childIndex < data.size()) {
mFocusedTaskIndex = childIndex;
// Focus the view if possible, otherwise, focus the view after we scroll into position
T key = data.get(childIndex);
DeckChildView tv = getChildViewForTask(key);
Runnable postScrollRunnable = null;
if (tv != null) {
tv.setFocusedTask(animateFocusedState);
} else {
postScrollRunnable =
new Runnable() {
@Override
public void run() {
DeckChildView tv = getChildViewForTask(mCallback.getData().get(mFocusedTaskIndex));
if (tv != null) {
tv.setFocusedTask(animateFocusedState);
}
}
};
}
// Scroll the view into position (just center it in the curve)
if (scrollToNewPosition) {
float newScroll = mLayoutAlgorithm.getStackScrollForTask(key) - 0.5f;
newScroll = mStackScroller.getBoundedStackScroll(newScroll);
mStackScroller.animateScroll(
mStackScroller.getStackScroll(), newScroll, postScrollRunnable);
} else {
if (postScrollRunnable != null) {
postScrollRunnable.run();
}
}
}
}
