/** Synchronizes the views with the model */
boolean synchronizeStackViewsWithModel() {
if (mStackViewsDirty) {
// Get all the task transforms
ArrayList<T> data = mCallback.getData();
float stackScroll = mStackScroller.getStackScroll();
int[] visibleRange = mTmpVisibleRange;
boolean isValidVisibleRange =
updateStackTransforms(mCurrentTaskTransforms, data, stackScroll, visibleRange, false);
// Return all the invisible children to the pool
mTmpTaskViewMap.clear();
int childCount = getChildCount();
for (int i = childCount - 1; i >= 0; i--) {
DeckChildView<T> tv = (DeckChildView) getChildAt(i);
T key = tv.getAttachedKey();
int taskIndex = data.indexOf(key);
if (visibleRange[1] <= taskIndex && taskIndex <= visibleRange[0]) {
mTmpTaskViewMap.put(key, tv);
} else {
mViewPool.returnViewToPool(tv);
}
}
for (int i = visibleRange[0]; isValidVisibleRange && i >= visibleRange[1]; i--) {
T key = data.get(i);
DeckChildViewTransform transform = mCurrentTaskTransforms.get(i);
DeckChildView tv = mTmpTaskViewMap.get(key);
if (tv == null) {
// TODO Check
tv = mViewPool.pickUpViewFromPool(key, key);
if (mStackViewsAnimationDuration > 0) {
// For items in the list, put them in start animating them from the
// approriate ends of the list where they are expected to appear
if (Float.compare(transform.p, 0f) <= 0) {
mLayoutAlgorithm.getStackTransform(0f, 0f, mTmpTransform, null);
} else {
mLayoutAlgorithm.getStackTransform(1f, 0f, mTmpTransform, null);
}
tv.updateViewPropertiesToTaskTransform(mTmpTransform, 0);
}
}
// Animate the task into place
tv.updateViewPropertiesToTaskTransform(
mCurrentTaskTransforms.get(i),
mStackViewsAnimationDuration,
mRequestUpdateClippingListener);
}
// Reset the request-synchronize params
mStackViewsAnimationDuration = 0;
mStackViewsDirty = false;
mStackViewsClipDirty = true;
return true;
}
return false;
}
/** Gets the stack transforms of a list of tasks, and returns the visible range of tasks. */
private boolean updateStackTransforms(
ArrayList<DeckChildViewTransform> taskTransforms,
ArrayList<T> data,
float stackScroll,
int[] visibleRangeOut,
boolean boundTranslationsToRect) {
int taskTransformCount = taskTransforms.size();
int taskCount = data.size();
int frontMostVisibleIndex = -1;
int backMostVisibleIndex = -1;
// We can reuse the task transforms where possible to reduce object allocation
if (taskTransformCount < taskCount) {
// If there are less transforms than tasks, then add as many transforms as necessary
for (int i = taskTransformCount; i < taskCount; i++) {
taskTransforms.add(new DeckChildViewTransform());
}
} else if (taskTransformCount > taskCount) {
// If there are more transforms than tasks, then just subset the transform list
taskTransforms.subList(0, taskCount);
}
// Update the stack transforms
DeckChildViewTransform prevTransform = null;
for (int i = taskCount - 1; i >= 0; i--) {
DeckChildViewTransform transform =
mLayoutAlgorithm.getStackTransform(
data.get(i), stackScroll, taskTransforms.get(i), prevTransform);
if (transform.visible) {
if (frontMostVisibleIndex < 0) {
frontMostVisibleIndex = i;
}
backMostVisibleIndex = i;
} else {
if (backMostVisibleIndex != -1) {
// We've reached the end of the visible range, so going down the rest of the
// stack, we can just reset the transforms accordingly
while (i >= 0) {
taskTransforms.get(i).reset();
i--;
}
break;
}
}
if (boundTranslationsToRect) {
transform.translationY =
Math.min(transform.translationY, mLayoutAlgorithm.mViewRect.bottom);
}
prevTransform = transform;
}
if (visibleRangeOut != null) {
visibleRangeOut[0] = frontMostVisibleIndex;
visibleRangeOut[1] = backMostVisibleIndex;
}
return frontMostVisibleIndex != -1 && backMostVisibleIndex != -1;
}
/** Updates the min and max virtual scroll bounds */
void updateMinMaxScroll(
boolean boundScrollToNewMinMax, boolean launchedWithAltTab, boolean launchedFromHome) {
// Compute the min and max scroll values
mLayoutAlgorithm.computeMinMaxScroll(mCallback.getData(), launchedWithAltTab, launchedFromHome);
// Debug logging
if (true) {
mStackScroller.boundScroll();
}
}
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();
}
}
/** Computes the stack and task rects */
public void computeRects(
int windowWidth,
int windowHeight,
Rect taskStackBounds,
boolean launchedWithAltTab,
boolean launchedFromHome) {
// Compute the rects in the stack algorithm
mLayoutAlgorithm.computeRects(windowWidth, windowHeight, taskStackBounds);
// Update the scroll bounds
updateMinMaxScroll(false, launchedWithAltTab, launchedFromHome);
}
/** 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();
}
}
}
}
/** 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 (mCallback.getData().size() > 0) {
int childCount = getChildCount();
// Animate all the task views into view
for (int i = childCount - 1; i >= 0; i--) {
DeckChildView<T> tv = (DeckChildView) getChildAt(i);
T key = tv.getAttachedKey();
ctx.currentTaskTransform = new DeckChildViewTransform();
ctx.currentStackViewIndex = i;
ctx.currentStackViewCount = childCount;
ctx.currentTaskRect = mLayoutAlgorithm.mTaskRect;
// TODO: this needs to go
ctx.currentTaskOccludesLaunchTarget = false;
ctx.updateListener = mRequestUpdateClippingListener;
mLayoutAlgorithm.getStackTransform(
key, 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;
// Poke the dozer to restart the trigger after the animation completes
mUIDozeTrigger.poke();
}
});
}
}
/**
* Computes the maximum number of visible tasks and thumbnails. Requires that
* updateMinMaxScrollForStack() is called first.
*/
public DeckViewLayoutAlgorithm.VisibilityReport computeStackVisibilityReport() {
return mLayoutAlgorithm.computeStackVisibilityReport(mCallback.getData());
}
