public void notifyDataSetChanged() {
// Get the stack scroll of the task to anchor to (since we are removing something, the front
// most task will be our anchor task)
T anchorTask = null;
float prevAnchorTaskScroll = 0;
boolean pullStackForward = mCallback.getData().size() > 0;
if (pullStackForward) {
anchorTask = mCallback.getData().get(mCallback.getData().size() - 1);
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);
T newFrontMostTask =
mCallback.getData().size() > 0
? mCallback.getData().get(mCallback.getData().size() - 1)
: null;
// Update the new front most task
if (newFrontMostTask != null) {
DeckChildView<T> frontTv = getChildViewForTask(newFrontMostTask);
if (frontTv != null) {
frontTv.onTaskBound(newFrontMostTask);
}
}
// If there are no remaining tasks
if (mCallback.getData().size() == 0) {
mCallback.onNoViewsToDeck();
}
}
/** Focuses the task at the specified index in the stack */
public void scrollToChild(int childIndex) {
if (getCurrentChildIndex() == childIndex) return;
if (0 <= childIndex && childIndex < mCallback.getData().size()) {
// Scroll the view into position (just center it in the curve)
float newScroll =
mLayoutAlgorithm.getStackScrollForTask(mCallback.getData().get(childIndex)) - 0.5f;
newScroll = mStackScroller.getBoundedStackScroll(newScroll);
mStackScroller.setStackScroll(newScroll);
// Alternate (animated) way
// mStackScroller.animateScroll(mStackScroller.getStackScroll(), newScroll, null);
}
}
/** 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();
}
}
}
}
