Translate recents when attaching to app window instead of fading

When attaching recents, translate it offscreen and use a spring to pull it
into position. When detaching, use the same spring to pull it back offscreen.

Bug: 129985827
Change-Id: I05339e2ec0932070365023bfafc83cbf2a4e178e

1 files changed, 10 insertions, 0 deletions

diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
index e38a315f8..90e123e84 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
@@ -1676,6 +1676,16 @@ public abstract class RecentsView<T extends BaseActivity> extends PagedView impl
         return mClearAllButton;
     }
 
+    /**
+     * @return How many pixels the running task is offset on the x-axis due to the current scrollX.
+     */
+    public float getScrollOffset() {
+        int startScroll = getScrollForPage(getRunningTaskIndex());
+        int offsetX = startScroll - getScrollX();
+        offsetX *= getScaleX();
+        return offsetX;
+    }
+
     public Consumer<MotionEvent> getEventDispatcher(RotationMode rotationMode) {
         if (rotationMode.isTransposed) {
             Matrix transform = new Matrix();