Bug 1817924 - Use Window manager coordinate for text selection menu on Android 11+. r=geckoview-reviewers,owlish

When using split window, the position of selection context menu is
strange position.

When on Android 11+, it has independent window manager per split
window, `onGetContentRect` of `ActionMode.Callback2` seems to use this
coordinates, instead of screen coordinate.

So we should consider this situation.

Also, our CI has no Android 11+ and no way to set split window, so I
cannot add unit test for it.

Differential Revision: https://phabricator.services.mozilla.com/D170472

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/BasicSelectionActionDelegate.java

@@ -13,8 +13,10 @@ import android.content.ComponentName;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
+import android.graphics.Matrix;
 import android.graphics.Point;
 import android.graphics.Rect;
+import android.graphics.RectF;
 import android.os.Build;
 import android.os.TransactionTooLargeException;
 import android.text.TextUtils;
@@ -467,7 +469,12 @@ public class BasicSelectionActionDelegate
       return;
     }
 
-    mSelection.screenRect.roundOut(outRect);
+    // outRect has to convert to current window coordinate.
+    final Matrix matrix = new Matrix();
+    mSession.getScreenToWindowManagerOffsetMatrix(matrix);
+    final RectF transformedRect = new RectF();
+    matrix.mapRect(transformedRect, mSelection.screenRect);
+    transformedRect.roundOut(outRect);
   }
 
   @TargetApi(Build.VERSION_CODES.M)

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoSession.java

@@ -31,6 +31,7 @@ import android.view.PointerIcon;
 import android.view.Surface;
 import android.view.View;
 import android.view.ViewStructure;
+import android.view.WindowManager;
 import android.view.inputmethod.CursorAnchorInfo;
 import android.view.inputmethod.ExtractedText;
 import android.view.inputmethod.ExtractedTextRequest;
@@ -5587,6 +5588,30 @@ public class GeckoSession {
     matrix.postTranslate(mLeft, mTop);
   }
 
+  /**
+   * Get a matrix for transforming from screen coordinates to Android's current window coordinates.
+   *
+   * @param matrix Matrix to be replaced by the transformation matrix.
+   * @see
+   *     https://developer.android.com/guide/topics/large-screens/multi-window-support#window_metrics
+   */
+  @UiThread
+  /* package */ void getScreenToWindowManagerOffsetMatrix(@NonNull final Matrix matrix) {
+    ThreadUtils.assertOnUiThread();
+
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+      final WindowManager wm =
+          (WindowManager)
+              GeckoAppShell.getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
+      final Rect currentWindowRect = wm.getCurrentWindowMetrics().getBounds();
+      matrix.postTranslate(-currentWindowRect.left, -currentWindowRect.top);
+      return;
+    }
+
+    // TODO(m_kato): Bug 1678531
+    // How to get window coordinate on Android 7-10 that supports split window?
+  }
+
   /**
    * Get the bounds of the client area in client coordinates. The returned top-left coordinates are
    * always (0, 0). Use the matrix from {@link #getClientToSurfaceMatrix(Matrix)} or {@link