Add new callback for when activity rotates

Launcher needs to distinguish display changes
that result naturally vs apps that launch
in a fixed portrait/landscape rotation during
the quickstep gesture.This callback helps anticipate
if a subseqent onDisplayChanged() will
have resulted from a natural rotation or not.

Bug: 154580671
Change-Id: I59ee7985a9f367e8fc5826c08476c1a25d1426b0

2 files changed, 15 insertions, 0 deletions

diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListener.java b/packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListener.java
index dd5cc7c9bbd4..796aaeefb62f 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListener.java
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListener.java
@@ -114,4 +114,7 @@ public abstract class TaskStackChangeListener {
 
     /** @see ITaskStackListener#onRecentTaskListFrozenChanged(boolean) */
     public void onRecentTaskListFrozenChanged(boolean frozen) { }
+
+    /** @see ITaskStackListener#onActivityRotation()*/
+    public void onActivityRotation() { }
 }
diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListeners.java b/packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListeners.java
index a76a901c5c81..13f7993f57d4 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListeners.java
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/system/TaskStackChangeListeners.java
@@ -237,6 +237,11 @@ public class TaskStackChangeListeners extends TaskStackListener {
         mHandler.obtainMessage(H.ON_TASK_DESCRIPTION_CHANGED, taskInfo).sendToTarget();
     }
 
+    @Override
+    public void onActivityRotation() {
+        mHandler.obtainMessage(H.ON_ACTIVITY_ROTATION).sendToTarget();
+    }
+
     private final class H extends Handler {
         private static final int ON_TASK_STACK_CHANGED = 1;
         private static final int ON_TASK_SNAPSHOT_CHANGED = 2;
@@ -260,6 +265,7 @@ public class TaskStackChangeListeners extends TaskStackListener {
         private static final int ON_SINGLE_TASK_DISPLAY_EMPTY = 22;
         private static final int ON_TASK_LIST_FROZEN_UNFROZEN = 23;
         private static final int ON_TASK_DESCRIPTION_CHANGED = 24;
+        private static final int ON_ACTIVITY_ROTATION = 25;
 
 
         public H(Looper looper) {
@@ -427,6 +433,12 @@ public class TaskStackChangeListeners extends TaskStackListener {
                         }
                         break;
                     }
+                    case ON_ACTIVITY_ROTATION: {
+                        for (int i = mTaskStackListeners.size() - 1; i >= 0; i--) {
+                            mTaskStackListeners.get(i).onActivityRotation();
+                        }
+                        break;
+                    }
                 }
             }
             if (msg.obj instanceof SomeArgs) {