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/**
* Copyright (C) 2015 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.util;
import android.util.Log;
import android.view.View;
import android.view.View.OnAttachStateChangeListener;
import android.view.ViewTreeObserver.OnDrawListener;
import com.android.launcher3.DeferredHandler;
import com.android.launcher3.Launcher;
import java.util.ArrayList;
import java.util.concurrent.Executor;
/**
* An executor which runs all the tasks after the first onDraw is called on the target view.
*/
public class ViewOnDrawExecutor implements Executor, OnDrawListener, Runnable,
OnAttachStateChangeListener {
private final ArrayList<Runnable> mTasks = new ArrayList<>();
private final DeferredHandler mHandler;
private Launcher mLauncher;
private View mAttachedView;
private boolean mCompleted;
private boolean mLoadAnimationCompleted;
private boolean mFirstDrawCompleted;
public ViewOnDrawExecutor(DeferredHandler handler) {
mHandler = handler;
}
public void attachTo(Launcher launcher) {
mLauncher = launcher;
mAttachedView = launcher.getWorkspace();
mAttachedView.addOnAttachStateChangeListener(this);
attachObserver();
}
private void attachObserver() {
if (!mCompleted) {
mAttachedView.getViewTreeObserver().addOnDrawListener(this);
}
}
@Override
public void execute(Runnable command) {
mTasks.add(command);
}
@Override
public void onViewAttachedToWindow(View v) {
attachObserver();
}
@Override
public void onViewDetachedFromWindow(View v) { }
@Override
public void onDraw() {
mFirstDrawCompleted = true;
mAttachedView.post(this);
}
public void onLoadAnimationCompleted() {
mLoadAnimationCompleted = true;
if (mAttachedView != null) {
mAttachedView.post(this);
}
}
@Override
public void run() {
// Post the pending tasks after both onDraw and onLoadAnimationCompleted have been called.
if (mLoadAnimationCompleted && mFirstDrawCompleted && !mCompleted) {
for (final Runnable r : mTasks) {
mHandler.post(r);
}
markCompleted();
}
}
public void markCompleted() {
mTasks.clear();
mCompleted = true;
if (mAttachedView != null) {
mAttachedView.getViewTreeObserver().removeOnDrawListener(this);
mAttachedView.removeOnAttachStateChangeListener(this);
}
if (mLauncher != null) {
mLauncher.clearPendingExecutor(this);
}
}
}
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