Invoke organizer events when a display is added / removed.

Bug: 175653536
Test: atest DisplayAreaTest
Change-Id: Ib1f6899fc952fc07367c7748de5312dedb5f920b

services/core/java/com/android/server/wm/DisplayArea.java

@@ -563,6 +563,22 @@ public class DisplayArea<T extends WindowContainer> extends WindowContainer<T> {
         }
     }
 
+    @Override
+    void onParentChanged(ConfigurationContainer newParent, ConfigurationContainer oldParent) {
+        super.onParentChanged(newParent, oldParent);
+        if (mOrganizer != null || newParent == null) {
+            return;
+        }
+        // Check if we have a registered organizer, just after mSurfaceControl is ready.
+        setOrganizer(mOrganizerController.getOrganizerByFeature(mFeatureId));
+    }
+
+    @Override
+    void removeImmediately() {
+        setOrganizer(null);
+        super.removeImmediately();
+    }
+
     @Override
     DisplayArea getDisplayArea() {
         return this;

services/core/java/com/android/server/wm/DisplayAreaOrganizerController.java

@@ -21,6 +21,7 @@ import static android.window.DisplayAreaOrganizer.FEATURE_RUNTIME_TASK_CONTAINER
 import static com.android.internal.protolog.ProtoLogGroup.WM_DEBUG_WINDOW_ORGANIZER;
 import static com.android.server.wm.DisplayArea.Type.ANY;
 
+import android.annotation.Nullable;
 import android.content.pm.ParceledListSlice;
 import android.os.Binder;
 import android.os.IBinder;
@@ -50,6 +51,10 @@ public class DisplayAreaOrganizerController extends IDisplayAreaOrganizerControl
     private final WindowManagerGlobalLock mGlobalLock;
     private final HashMap<Integer, IDisplayAreaOrganizer> mOrganizersByFeatureIds = new HashMap();
 
+    @Nullable IDisplayAreaOrganizer getOrganizerByFeature(int featureId) {
+        return mOrganizersByFeatureIds.get(featureId);
+    }
+
     private class DeathRecipient implements IBinder.DeathRecipient {
         int mFeature;
         IDisplayAreaOrganizer mOrganizer;

services/tests/wmtests/src/com/android/server/wm/DisplayAreaTest.java

@@ -43,11 +43,15 @@ import static com.android.server.wm.testing.Assert.assertThrows;
 import static com.google.common.truth.Truth.assertThat;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.argThat;
+import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyZeroInteractions;
+import static org.mockito.Mockito.when;
 
 import android.content.pm.ActivityInfo;
 import android.graphics.Rect;
@@ -56,6 +60,7 @@ import android.platform.test.annotations.Presubmit;
 import android.view.SurfaceControl;
 import android.view.View;
 import android.view.WindowManager;
+import android.window.IDisplayAreaOrganizer;
 
 import com.google.android.collect.Lists;
 
@@ -498,6 +503,42 @@ public class DisplayAreaTest extends WindowTestsBase {
         assertThat(mDisplayContent.getOrientationRequestingTaskDisplayArea()).isEqualTo(tda);
     }
 
+    @Test
+    public void onParentChanged_onDisplayAreaAppeared() {
+        final DisplayArea<WindowContainer> displayArea = new DisplayArea<>(
+                mWm, BELOW_TASKS, "NewArea", FEATURE_DEFAULT_TASK_CONTAINER);
+
+        final IDisplayAreaOrganizer mockDisplayAreaOrganizer = mock(IDisplayAreaOrganizer.class);
+        spyOn(mWm.mAtmService.mWindowOrganizerController.mDisplayAreaOrganizerController);
+        when(mWm.mAtmService.mWindowOrganizerController.mDisplayAreaOrganizerController
+                .getOrganizerByFeature(FEATURE_DEFAULT_TASK_CONTAINER))
+                .thenReturn(mockDisplayAreaOrganizer);
+
+        mDisplayContent.addChild(displayArea, 0);
+        assertEquals(mockDisplayAreaOrganizer, displayArea.mOrganizer);
+        verify(mWm.mAtmService.mWindowOrganizerController.mDisplayAreaOrganizerController)
+                .onDisplayAreaAppeared(
+                        eq(mockDisplayAreaOrganizer),
+                        argThat(it -> it == displayArea && it.getSurfaceControl() != null));
+    }
+
+    @Test
+    public void onParentChanged_onDisplayAreaVanished() {
+        final DisplayArea<WindowContainer> displayArea = new DisplayArea<>(
+                mWm, BELOW_TASKS, "NewArea", FEATURE_DEFAULT_TASK_CONTAINER);
+
+        final IDisplayAreaOrganizer mockDisplayAreaOrganizer = mock(IDisplayAreaOrganizer.class);
+        displayArea.mOrganizer = mockDisplayAreaOrganizer;
+        spyOn(mWm.mAtmService.mWindowOrganizerController.mDisplayAreaOrganizerController);
+
+        mDisplayContent.addChild(displayArea, 0);
+        displayArea.removeImmediately();
+
+        assertNull(displayArea.mOrganizer);
+        verify(mWm.mAtmService.mWindowOrganizerController.mDisplayAreaOrganizerController)
+                .onDisplayAreaVanished(mockDisplayAreaOrganizer, displayArea);
+    }
+
     private static class TestDisplayArea<T extends WindowContainer> extends DisplayArea<T> {
         private TestDisplayArea(WindowManagerService wms, Rect bounds) {
             super(wms, ANY, "half display area");