Drop input for toast and child surfaces am: 55c1473bf2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16502616

Change-Id: I5834fdb9e3559023a96cde91067bb1e988a01034

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

@@ -147,6 +147,7 @@ import android.graphics.Insets;
 import android.graphics.PixelFormat;
 import android.graphics.Rect;
 import android.graphics.Region;
+import android.gui.DropInputMode;
 import android.hardware.input.InputManager;
 import android.hardware.power.V1_0.PowerHint;
 import android.os.Handler;
@@ -967,6 +968,20 @@ public class DisplayPolicy {
 
     }
 
+    /**
+     * Add additional policy if needed to ensure the window or its children should not receive any
+     * input.
+     */
+    public void setDropInputModePolicy(WindowState win, LayoutParams attrs) {
+        if (attrs.type == TYPE_TOAST
+                && (attrs.privateFlags & PRIVATE_FLAG_TRUSTED_OVERLAY) == 0) {
+            // Toasts should not receive input. These windows should not have any children, so
+            // force this hierarchy of windows to drop all input.
+            mService.mTransactionFactory.get()
+                    .setDropInputMode(win.getSurfaceControl(), DropInputMode.ALL).apply();
+        }
+    }
+
     /**
      * @return {@code true} if the calling activity initiate toast and is visible with
      * {@link WindowManager.LayoutParams#FLAG_SHOW_WHEN_LOCKED} flag.

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

@@ -1656,6 +1656,7 @@ public class WindowManagerService extends IWindowManager.Stub
 
             win.mToken.addWindow(win);
             displayPolicy.addWindowLw(win, attrs);
+            displayPolicy.setDropInputModePolicy(win, win.mAttrs);
             if (type == TYPE_INPUT_METHOD) {
                 displayContent.setInputMethodWindowLocked(win);
                 imMayMove = false;