Fix the initialization of the system gesture top location

1. Initialize the system gesture top location in the constructor
2. Fix the calculation of system gesture top location when there is no
   botton inset

Bug: 380320995
Test: atest WindowMagnificationControllerTest
Test: atest WindowMagnificationAnimationControllerTest
Flag: com.android.systemui.update_window_magnifier_bottom_boundary
Change-Id: Ie6d97a6fe2be6b07ea9e1487f71d572f1d2fd397

1 files changed, 7 insertions, 3 deletions

diff --git a/packages/SystemUI/src/com/android/systemui/accessibility/WindowMagnificationController.java b/packages/SystemUI/src/com/android/systemui/accessibility/WindowMagnificationController.java
index a67ec65cceda..8734d05bc894 100644
--- a/packages/SystemUI/src/com/android/systemui/accessibility/WindowMagnificationController.java
+++ b/packages/SystemUI/src/com/android/systemui/accessibility/WindowMagnificationController.java
@@ -296,6 +296,7 @@ class WindowMagnificationController implements View.OnTouchListener, SurfaceHold
         mGestureDetector =
                 new MagnificationGestureDetector(mContext, handler, this);
         mWindowInsetChangeRunnable = this::onWindowInsetChanged;
+        mWindowInsetChangeRunnable.run();
 
         // Initialize listeners.
         mMirrorViewRunnable = new Runnable() {
@@ -367,8 +368,12 @@ class WindowMagnificationController implements View.OnTouchListener, SurfaceHold
     private boolean updateSystemGestureInsetsTop() {
         final WindowMetrics windowMetrics = mWm.getCurrentWindowMetrics();
         final Insets insets = windowMetrics.getWindowInsets().getInsets(systemGestures());
-        final int gestureTop =
-                insets.bottom != 0 ? windowMetrics.getBounds().bottom - insets.bottom : -1;
+        final int gestureTop;
+        if (Flags.updateWindowMagnifierBottomBoundary()) {
+            gestureTop = windowMetrics.getBounds().bottom - insets.bottom;
+        } else {
+            gestureTop = insets.bottom != 0 ? windowMetrics.getBounds().bottom - insets.bottom : -1;
+        }
         if (gestureTop != mSystemGestureTop) {
             mSystemGestureTop = gestureTop;
             return true;
@@ -953,7 +958,6 @@ class WindowMagnificationController implements View.OnTouchListener, SurfaceHold
                 ? mSystemGestureTop - height + mOuterBorderSize
                 : mWindowBounds.bottom - height + mOuterBorderSize;
         final int y = MathUtils.clamp(mMagnificationFrame.top - mMirrorSurfaceMargin, minY, maxY);
-
         if (computeWindowSize) {
             LayoutParams params = (LayoutParams) mMirrorView.getLayoutParams();
             params.width = width;