/** 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);
}
}
/** Requests this task stacks to start it's exit-recents animation. */
public void startExitToHomeAnimation(ViewAnimation.TaskViewExitContext ctx) {
// Stop any scrolling
mStackScroller.stopScroller();
mStackScroller.stopBoundScrollAnimation();
// Animate all the task views out of view
ctx.offscreenTranslationY =
mLayoutAlgorithm.mViewRect.bottom
- (mLayoutAlgorithm.mTaskRect.top - mLayoutAlgorithm.mViewRect.top);
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
DeckChildView tv = (DeckChildView) getChildAt(i);
tv.startExitToHomeAnimation(ctx);
}
}
public void initialize(Callback<T> callback) {
mCallback = callback;
requestLayout();
mViewPool = new ViewPool<DeckChildView<T>, T>(getContext(), this);
mInflater = LayoutInflater.from(getContext());
mLayoutAlgorithm = new DeckViewLayoutAlgorithm<T>(mConfig);
mStackScroller = new DeckViewScroller(getContext(), mConfig, mLayoutAlgorithm);
mStackScroller.setCallbacks(this);
mTouchHandler = new DeckViewTouchHandler(getContext(), this, mConfig, mStackScroller);
mUIDozeTrigger =
new DozeTrigger(
mConfig.taskBarDismissDozeDelaySeconds,
new Runnable() {
@Override
public void run() {
// Show the task bar dismiss buttons
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
DeckChildView tv = (DeckChildView) getChildAt(i);
tv.startNoUserInteractionAnimation();
}
}
});
}
/** 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;
}
/** Resets this TaskStackView for reuse. */
void reset() {
// Reset the focused task
resetFocusedTask();
// Return all the views to the pool
int childCount = getChildCount();
for (int i = childCount - 1; i >= 0; i--) {
DeckChildView<T> tv = (DeckChildView) getChildAt(i);
mViewPool.returnViewToPool(tv);
}
// Mark each task view for relayout
if (mViewPool != null) {
Iterator<DeckChildView<T>> iter = mViewPool.poolViewIterator();
if (iter != null) {
while (iter.hasNext()) {
DeckChildView tv = iter.next();
tv.reset();
}
}
}
// Reset the stack state
mStackViewsDirty = true;
mStackViewsClipDirty = true;
mAwaitingFirstLayout = true;
mPrevAccessibilityFocusedIndex = -1;
if (mUIDozeTrigger != null) {
mUIDozeTrigger.stopDozing();
mUIDozeTrigger.resetTrigger();
}
mStackScroller.reset();
}
@Override
public void computeScroll() {
mStackScroller.computeScroll();
// Synchronize the views
synchronizeStackViewsWithModel();
clipTaskViews();
// Notify accessibility
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED);
}
/** 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();
}
}
/** 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();
}
}
}
}
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();
}
}
/**
* This is called with the full window width and height to allow stack view children to perform
* the full screen transition down.
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
// 可见区域
Rect _taskStackBounds = new Rect();
mConfig.getTaskStackBounds(
width, height, mConfig.systemInsets.top, mConfig.systemInsets.right, _taskStackBounds);
setStackInsetRect(_taskStackBounds);
// Compute our stack/task rects
// Rect taskStackBounds = new Rect(mTaskStackBounds);
// taskStackBounds.bottom -= mConfig.systemInsets.bottom;
computeRects(
width, height, _taskStackBounds, mConfig.launchedWithAltTab, mConfig.launchedFromHome);
// If this is the first layout, then scroll to the front of the stack and synchronize the
// stack views immediately to load all the views
if (mAwaitingFirstLayout) {
mStackScroller.setStackScrollToInitialState();
// requestSynchronizeStackViewsWithModel();
// synchronizeStackViewsWithModel();
}
// Measure each of the TaskViews
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
DeckChildView tv = (DeckChildView) getChildAt(i);
// if (tv.getBackground() != null) {
// tv.getBackground().getPadding(mTmpRect);
// } else {
// mTmpRect.setEmpty();
// }
tv.measure(
MeasureSpec.makeMeasureSpec(
mLayoutAlgorithm.mTaskRect.width() + mTmpRect.left + mTmpRect.right,
MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(
mLayoutAlgorithm.mTaskRect.height() + mTmpRect.top + mTmpRect.bottom,
MeasureSpec.EXACTLY));
// tv.measure(
// widthMeasureSpec,
// heightMeasureSpec);
}
setMeasuredDimension(width, height);
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
int childCount = getChildCount();
if (childCount > 0) {
DeckChildView<T> backMostTask = (DeckChildView) getChildAt(0);
DeckChildView<T> frontMostTask = (DeckChildView) getChildAt(childCount - 1);
event.setFromIndex(mCallback.getData().indexOf(backMostTask.getAttachedKey()));
event.setToIndex(mCallback.getData().indexOf(frontMostTask.getAttachedKey()));
}
event.setItemCount(mCallback.getData().size());
event.setScrollY(mStackScroller.mScroller.getCurrY());
event.setMaxScrollY(mStackScroller.progressToScrollRange(mLayoutAlgorithm.mMaxScrollP));
}
/** 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();
}
});
}
}