Traverse window hierarchy without window list
Added support for to get all windows in the hierarchy without needing
to use WindowList concept which is a very complicated implementation
in the code base.
This implementation walks the hierarchy node by node returns windows
in order to the caller using a callback.
Test: bit FrameworksServicesTests:com.android.server.wm.DisplayContentTests
Change-Id: I2719f7c96f26dad23f91c1c589be88712bd224b8
diff --git a/services/core/java/com/android/server/wm/AppWindowToken.java b/services/core/java/com/android/server/wm/AppWindowToken.java
index 622eece..05e6f96 100644
--- a/services/core/java/com/android/server/wm/AppWindowToken.java
+++ b/services/core/java/com/android/server/wm/AppWindowToken.java
@@ -66,6 +66,7 @@
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
+import java.util.function.Consumer;
class AppTokenList extends ArrayList<AppWindowToken> {
}
@@ -1269,6 +1270,22 @@
}
@Override
+ void forAllWindows(Consumer<WindowState> callback, boolean traverseTopToBottom) {
+ // For legacy reasons we process the TaskStack.mExitingAppTokens first in DisplayContent
+ // before the non-exiting app tokens. So, we skip the exiting app tokens here.
+ // TODO: Investigate if we need to continue to do this or if we can just process them
+ // in-order.
+ if (mIsExiting && !waitingForReplacement()) {
+ return;
+ }
+ forAllWindowsUnchecked(callback, traverseTopToBottom);
+ }
+
+ void forAllWindowsUnchecked(Consumer<WindowState> callback, boolean traverseTopToBottom) {
+ super.forAllWindows(callback, traverseTopToBottom);
+ }
+
+ @Override
AppWindowToken asAppWindowToken() {
// I am an app window token!
return this;