From 3cd02c2b036d2196e97744681b84554b5ad4ee4d Mon Sep 17 00:00:00 2001
From: Evan Rosky <erosky@google.com>
Date: Thu, 2 Feb 2023 14:07:45 -0800
Subject: [PATCH] Hook-up the accessibility (magnifier) ontransition cb to
 shell

Notifies the magnifier stuff that a transition is happening so
it can, in turn, notify some observer

Bug: 267646116
Test: open an app with magnifier enabled
Change-Id: Icf6e4ce937dcd804b483091bd995ec7b40d7384e
---
 .../server/wm/AccessibilityController.java    | 34 +++++++++++++++++++
 .../com/android/server/wm/Transition.java     |  5 +++
 2 files changed, 39 insertions(+)

diff --git a/services/core/java/com/android/server/wm/AccessibilityController.java b/services/core/java/com/android/server/wm/AccessibilityController.java
index 65127e4a3b31e..8ce8c46d19394 100644
--- a/services/core/java/com/android/server/wm/AccessibilityController.java
+++ b/services/core/java/com/android/server/wm/AccessibilityController.java
@@ -342,6 +342,18 @@ final class AccessibilityController {
         // Not relevant for the window observer.
     }
 
+    void onWMTransition(int displayId, @WindowManager.TransitionType int type) {
+        if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK)) {
+            mAccessibilityTracing.logTrace(TAG + ".onAppWindowTransition",
+                    FLAGS_MAGNIFICATION_CALLBACK, "displayId=" + displayId + "; type=" + type);
+        }
+        final DisplayMagnifier displayMagnifier = mDisplayMagnifiers.get(displayId);
+        if (displayMagnifier != null) {
+            displayMagnifier.onWMTransition(displayId, type);
+        }
+        // Not relevant for the window observer.
+    }
+
     void onWindowTransition(WindowState windowState, int transition) {
         if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK
                 | FLAGS_WINDOWS_FOR_ACCESSIBILITY_CALLBACK)) {
@@ -708,6 +720,28 @@ final class AccessibilityController {
             }
         }
 
+        void onWMTransition(int displayId, @WindowManager.TransitionType int type) {
+            if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK)) {
+                mAccessibilityTracing.logTrace(LOG_TAG + ".onWMTransition",
+                        FLAGS_MAGNIFICATION_CALLBACK, "displayId=" + displayId + "; type=" + type);
+            }
+            if (DEBUG_WINDOW_TRANSITIONS) {
+                Slog.i(LOG_TAG, "Window transition: " + WindowManager.transitTypeToString(type)
+                        + " displayId: " + displayId);
+            }
+            final boolean magnifying = mMagnifedViewport.isMagnifying();
+            if (magnifying) {
+                // All opening/closing situations.
+                switch (type) {
+                    case WindowManager.TRANSIT_OPEN:
+                    case WindowManager.TRANSIT_TO_FRONT:
+                    case WindowManager.TRANSIT_CLOSE:
+                    case WindowManager.TRANSIT_TO_BACK:
+                        mHandler.sendEmptyMessage(MyHandler.MESSAGE_NOTIFY_USER_CONTEXT_CHANGED);
+                }
+            }
+        }
+
         void onWindowTransition(WindowState windowState, int transition) {
             if (mAccessibilityTracing.isTracingEnabled(FLAGS_MAGNIFICATION_CALLBACK)) {
                 mAccessibilityTracing.logTrace(LOG_TAG + ".onWindowTransition",
diff --git a/services/core/java/com/android/server/wm/Transition.java b/services/core/java/com/android/server/wm/Transition.java
index d2f30ced46c8c..a9849694a324e 100644
--- a/services/core/java/com/android/server/wm/Transition.java
+++ b/services/core/java/com/android/server/wm/Transition.java
@@ -1114,6 +1114,11 @@ class Transition implements BLASTSyncEngine.TransactionReadyListener {
                 // client, we should finish and apply it here so the transactions aren't lost.
                 cleanUpOnFailure();
             }
+            final AccessibilityController accessibilityController =
+                    dc.mWmService.mAccessibilityController;
+            if (accessibilityController.hasCallbacks()) {
+                accessibilityController.onWMTransition(dc.getDisplayId(), mType);
+            }
         } else {
             // No player registered, so just finish/apply immediately
             cleanUpOnFailure();