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/*
* Copyright (C) 2020 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.graphics.Matrix;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.RemoteException;
import android.util.Log;
import android.view.accessibility.IAccessibilityEmbeddedConnection;
import java.lang.ref.WeakReference;
class RemoteAccessibilityController {
private static final String TAG = "RemoteAccessibilityController";
private int mHostId;
private RemoteAccessibilityEmbeddedConnection mConnectionWrapper;
private Matrix mWindowMatrixForEmbeddedHierarchy = new Matrix();
private final float[] mMatrixValues = new float[9];
private View mHostView;
RemoteAccessibilityController(View v) {
mHostView = v;
}
private void runOnUiThread(Runnable runnable) {
final Handler h = mHostView.getHandler();
if (h != null && h.getLooper() != Looper.myLooper()) {
h.post(runnable);
} else {
runnable.run();
}
}
void assosciateHierarchy(IAccessibilityEmbeddedConnection connection,
IBinder leashToken, int hostId) {
mHostId = hostId;
try {
leashToken = connection.associateEmbeddedHierarchy(
leashToken, mHostId);
setRemoteAccessibilityEmbeddedConnection(connection, leashToken);
} catch (RemoteException e) {
Log.d(TAG, "Error in associateEmbeddedHierarchy " + e);
}
}
void disassosciateHierarchy() {
setRemoteAccessibilityEmbeddedConnection(null, null);
}
boolean alreadyAssociated(IAccessibilityEmbeddedConnection connection) {
if (mConnectionWrapper == null) {
return false;
}
return mConnectionWrapper.mConnection.equals(connection);
}
boolean connected() {
return mConnectionWrapper != null;
}
IBinder getLeashToken() {
return mConnectionWrapper.getLeashToken();
}
/**
* Wrapper of accessibility embedded connection for embedded view hierarchy.
*/
private static final class RemoteAccessibilityEmbeddedConnection
implements IBinder.DeathRecipient {
private final WeakReference<RemoteAccessibilityController> mController;
private final IAccessibilityEmbeddedConnection mConnection;
private final IBinder mLeashToken;
RemoteAccessibilityEmbeddedConnection(
RemoteAccessibilityController controller,
IAccessibilityEmbeddedConnection connection,
IBinder leashToken) {
mController = new WeakReference<>(controller);
mConnection = connection;
mLeashToken = leashToken;
}
IAccessibilityEmbeddedConnection getConnection() {
return mConnection;
}
IBinder getLeashToken() {
return mLeashToken;
}
void linkToDeath() throws RemoteException {
mConnection.asBinder().linkToDeath(this, 0);
}
void unlinkToDeath() {
mConnection.asBinder().unlinkToDeath(this, 0);
}
@Override
public void binderDied() {
unlinkToDeath();
RemoteAccessibilityController controller = mController.get();
if (controller == null) {
return;
}
controller.runOnUiThread(() -> {
if (controller.mConnectionWrapper == this) {
controller.mConnectionWrapper = null;
}
});
}
}
private void setRemoteAccessibilityEmbeddedConnection(
IAccessibilityEmbeddedConnection connection, IBinder leashToken) {
try {
if (mConnectionWrapper != null) {
mConnectionWrapper.getConnection()
.disassociateEmbeddedHierarchy();
mConnectionWrapper.unlinkToDeath();
mConnectionWrapper = null;
}
if (connection != null && leashToken != null) {
mConnectionWrapper =
new RemoteAccessibilityEmbeddedConnection(this, connection, leashToken);
mConnectionWrapper.linkToDeath();
}
} catch (RemoteException e) {
Log.d(TAG, "Error while setRemoteEmbeddedConnection " + e);
}
}
private RemoteAccessibilityEmbeddedConnection getRemoteAccessibilityEmbeddedConnection() {
return mConnectionWrapper;
}
void setWindowMatrix(Matrix m, boolean force) {
// If the window matrix doesn't change, do nothing.
if (!force && m.equals(mWindowMatrixForEmbeddedHierarchy)) {
return;
}
try {
final RemoteAccessibilityEmbeddedConnection wrapper =
getRemoteAccessibilityEmbeddedConnection();
if (wrapper == null) {
return;
}
m.getValues(mMatrixValues);
wrapper.getConnection().setWindowMatrix(mMatrixValues);
mWindowMatrixForEmbeddedHierarchy.set(m);
} catch (RemoteException e) {
Log.d(TAG, "Error while setScreenMatrix " + e);
}
}
}
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