Support accessibility on embedded hierarchies (2/n)
Introduce AccessibilityEmbeddedConnection. This interface provides
to the host view to the latter can interact with the view hierarchy
in SurfaceControlViewHost.
Bug: 137593247
Test: a11y CTS & unit tests
Change-Id: I9c4f5478c5ecd3bda7f688fa23660f372b59512b
diff --git a/core/java/android/view/AccessibilityEmbeddedConnection.java b/core/java/android/view/AccessibilityEmbeddedConnection.java
new file mode 100644
index 0000000..cc1e501
--- /dev/null
+++ b/core/java/android/view/AccessibilityEmbeddedConnection.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.view;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.graphics.Matrix;
+import android.os.IBinder;
+import android.view.accessibility.AccessibilityManager;
+import android.view.accessibility.IAccessibilityEmbeddedConnection;
+
+import java.lang.ref.WeakReference;
+
+/**
+ * This class is an interface this ViewRootImpl provides to the host view to the latter
+ * can interact with the view hierarchy in SurfaceControlViewHost.
+ *
+ * @hide
+ */
+final class AccessibilityEmbeddedConnection extends IAccessibilityEmbeddedConnection.Stub {
+ private final WeakReference<ViewRootImpl> mViewRootImpl;
+
+ AccessibilityEmbeddedConnection(ViewRootImpl viewRootImpl) {
+ mViewRootImpl = new WeakReference<>(viewRootImpl);
+ }
+
+ @Override
+ public @Nullable IBinder associateEmbeddedHierarchy(@NonNull IBinder host, int hostViewId) {
+ final ViewRootImpl viewRootImpl = mViewRootImpl.get();
+ if (viewRootImpl != null) {
+ final AccessibilityManager accessibilityManager = AccessibilityManager.getInstance(
+ viewRootImpl.mContext);
+ viewRootImpl.mAttachInfo.mLeashedParentToken = host;
+ viewRootImpl.mAttachInfo.mLeashedParentAccessibilityViewId = hostViewId;
+ if (accessibilityManager.isEnabled()) {
+ accessibilityManager.associateEmbeddedHierarchy(host, viewRootImpl.mLeashToken);
+ }
+ return viewRootImpl.mLeashToken;
+ }
+ return null;
+ }
+
+ @Override
+ public void disassociateEmbeddedHierarchy() {
+ final ViewRootImpl viewRootImpl = mViewRootImpl.get();
+ if (viewRootImpl != null) {
+ final AccessibilityManager accessibilityManager = AccessibilityManager.getInstance(
+ viewRootImpl.mContext);
+ viewRootImpl.mAttachInfo.mLeashedParentToken = null;
+ viewRootImpl.mAttachInfo.mLeashedParentAccessibilityViewId = View.NO_ID;
+ viewRootImpl.mAttachInfo.mLocationInParentDisplay.set(0, 0);
+ if (accessibilityManager.isEnabled()) {
+ accessibilityManager.disassociateEmbeddedHierarchy(viewRootImpl.mLeashToken);
+ }
+ }
+ }
+
+ @Override
+ public void setScreenMatrix(float[] matrixValues) {
+ final ViewRootImpl viewRootImpl = mViewRootImpl.get();
+ if (viewRootImpl != null) {
+ // TODO(b/148821260): Implement the rest of matrix values.
+ viewRootImpl.mAttachInfo.mLocationInParentDisplay.set(
+ (int) matrixValues[Matrix.MTRANS_X], (int) matrixValues[Matrix.MTRANS_Y]);
+ }
+ }
+}