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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 com.android.launcher3;
import static android.content.Intent.EXTRA_COMPONENT_NAME;
import static android.content.Intent.EXTRA_USER;
import static com.android.launcher3.AbstractFloatingView.TYPE_ICON_SURFACE;
import android.annotation.TargetApi;
import android.content.ComponentName;
import android.content.Intent;
import android.graphics.RectF;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.os.UserHandle;
import android.util.Log;
import android.view.SurfaceControl;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.android.launcher3.views.ActivityContext;
import java.lang.ref.WeakReference;
/**
* Class to encapsulate the handshake protocol between Launcher and gestureNav.
*/
public class GestureNavContract {
private static final String TAG = "GestureNavContract";
public static final String EXTRA_GESTURE_CONTRACT = "gesture_nav_contract_v1";
public static final String EXTRA_ICON_POSITION = "gesture_nav_contract_icon_position";
public static final String EXTRA_ICON_SURFACE = "gesture_nav_contract_surface_control";
public static final String EXTRA_REMOTE_CALLBACK = "android.intent.extra.REMOTE_CALLBACK";
public static final String EXTRA_ON_FINISH_CALLBACK = "gesture_nav_contract_finish_callback";
public final ComponentName componentName;
public final UserHandle user;
private final Message mCallback;
public GestureNavContract(ComponentName componentName, UserHandle user, Message callback) {
this.componentName = componentName;
this.user = user;
this.mCallback = callback;
}
/**
* Sends the position information to the receiver
*/
@TargetApi(Build.VERSION_CODES.R)
public void sendEndPosition(RectF position, ActivityContext context,
@Nullable SurfaceControl surfaceControl) {
Bundle result = new Bundle();
result.putParcelable(EXTRA_ICON_POSITION, position);
result.putParcelable(EXTRA_ICON_SURFACE, surfaceControl);
if (sMessageReceiver == null) {
sMessageReceiver = new StaticMessageReceiver();
}
result.putParcelable(EXTRA_ON_FINISH_CALLBACK, sMessageReceiver.setCurrentContext(context));
Message callback = Message.obtain();
callback.copyFrom(mCallback);
callback.setData(result);
try {
callback.replyTo.send(callback);
} catch (RemoteException e) {
Log.e(TAG, "Error sending icon position", e);
}
}
/**
* Clears and returns the GestureNavContract if it was present in the intent.
*/
public static GestureNavContract fromIntent(Intent intent) {
if (!Utilities.ATLEAST_R) {
return null;
}
Bundle extras = intent.getBundleExtra(EXTRA_GESTURE_CONTRACT);
if (extras == null) {
return null;
}
intent.removeExtra(EXTRA_GESTURE_CONTRACT);
ComponentName componentName = extras.getParcelable(EXTRA_COMPONENT_NAME);
UserHandle userHandle = extras.getParcelable(EXTRA_USER);
Message callback = extras.getParcelable(EXTRA_REMOTE_CALLBACK);
if (componentName != null && userHandle != null && callback != null
&& callback.replyTo != null) {
return new GestureNavContract(componentName, userHandle, callback);
}
return null;
}
/**
* Message used for receiving gesture nav contract information. We use a static messenger to
* avoid leaking too make binders in case the receiving launcher does not handle the contract
* properly.
*/
private static StaticMessageReceiver sMessageReceiver = null;
private static class StaticMessageReceiver implements Handler.Callback {
private static final int MSG_CLOSE_LAST_TARGET = 0;
private final Messenger mMessenger =
new Messenger(new Handler(Looper.getMainLooper(), this));
private WeakReference<ActivityContext> mLastTarget = new WeakReference<>(null);
public Message setCurrentContext(ActivityContext context) {
mLastTarget = new WeakReference<>(context);
Message msg = Message.obtain();
msg.replyTo = mMessenger;
msg.what = MSG_CLOSE_LAST_TARGET;
return msg;
}
@Override
public boolean handleMessage(@NonNull Message message) {
if (message.what == MSG_CLOSE_LAST_TARGET) {
ActivityContext lastContext = mLastTarget.get();
if (lastContext != null) {
AbstractFloatingView.closeOpenViews(lastContext, false, TYPE_ICON_SURFACE);
}
return true;
}
return false;
}
}
}
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