1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.contacts.util;
18
19import android.view.View;
20import android.view.ViewTreeObserver.OnGlobalLayoutListener;
21import android.view.ViewTreeObserver.OnDrawListener;
22
23/** Static methods that are useful for scheduling actions to occur at a later time. */
24public class SchedulingUtils {
25
26
27    /** Runs a piece of code after the next layout run */
28    public static void doAfterLayout(final View view, final Runnable runnable) {
29        final OnGlobalLayoutListener listener = new OnGlobalLayoutListener() {
30            @Override
31            public void onGlobalLayout() {
32                // Layout pass done, unregister for further events
33                view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
34                runnable.run();
35            }
36        };
37        view.getViewTreeObserver().addOnGlobalLayoutListener(listener);
38    }
39
40    /** Runs a piece of code just before the next draw. */
41    public static void doAfterDraw(final View view, final Runnable runnable) {
42        final OnDrawListener listener = new OnDrawListener() {
43            @Override
44            public void onDraw() {
45                view.getViewTreeObserver().removeOnDrawListener(this);
46                runnable.run();
47            }
48        };
49        view.getViewTreeObserver().addOnDrawListener(listener);
50    }
51}
52