commit a1fb9be437b672f52ad64e1506038757ec060dcf
author Daichi Hirono <hirono@google.com> Mon Dec 18 17:02:54 2017 +0900
committer Daichi Hirono <hirono@google.com> Thu Jan 18 10:14:14 2018 +0900
tree f6d6772dbaed816f110abc7ee76a118342a18541
parent 57fce6c63c593cf115e2ee563f0b60b6c2c87d99

Create a drag shadow surface in app process,

Previoulsy a drag shadow surface is created in the system process. App needs
to call one more binder call (prepareDrag) to obtain the surface from
the system process.

The CL lets an app to create a drag shadow surface by itself. Then app
transfer the surface to system server by using reparent
API.

Bug: 70818582
Test: com.android.server.wm.DragDropControllerTests,
      android.server.wm.CrossAppDragAndDropTests,
      manually check the drag and drop behavior on test app.
Change-Id: I72796efffbefe78a802d7c441dea308d1cdea572

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

diff --git a/services/core/java/com/android/server/wm/Session.java b/services/core/java/com/android/server/wm/Session.java
index 192d6c8..9280620 100644
--- a/services/core/java/com/android/server/wm/Session.java
+++ b/services/core/java/com/android/server/wm/Session.java
@@ -51,6 +51,7 @@
 import android.view.IWindowSessionCallback;
 import android.view.InputChannel;
 import android.view.Surface;
+import android.view.SurfaceControl;
 import android.view.SurfaceSession;
 import android.view.WindowManager;
 
@@ -309,26 +310,24 @@
 
     /* Drag/drop */
     @Override
-    public IBinder prepareDrag(IWindow window, int flags, int width, int height,
-            Surface outSurface) {
+    public IBinder prepareDrag(IWindow window, int flags, int width, int height) {
         final int callerPid = Binder.getCallingPid();
         final int callerUid = Binder.getCallingUid();
         final long ident = Binder.clearCallingIdentity();
         try {
-            return mDragDropController.prepareDrag(
-                    mSurfaceSession, callerPid, callerUid, window, flags, width, height,
-                    outSurface);
+            return mDragDropController.prepareDrag(mSurfaceSession, callerPid, callerUid, window,
+                    flags, width, height);
         } finally {
             Binder.restoreCallingIdentity(ident);
         }
     }
 
     @Override
-    public boolean performDrag(IWindow window, IBinder dragToken,
+    public boolean performDrag(IWindow window, IBinder dragToken, SurfaceControl surface,
             int touchSource, float touchX, float touchY, float thumbCenterX, float thumbCenterY,
             ClipData data) {
-        return mDragDropController.performDrag(window, dragToken, touchSource,
-                touchX, touchY, thumbCenterX, thumbCenterY, data);
+        return mDragDropController.performDrag(mSurfaceSession, window, dragToken, surface,
+                touchSource, touchX, touchY, thumbCenterX, thumbCenterY, data);
     }
 
     @Override