| /* |
| * Copyright (C) 2012 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.contacts.util; |
| |
| import android.view.View; |
| import android.view.ViewTreeObserver.OnDrawListener; |
| import android.view.ViewTreeObserver.OnGlobalLayoutListener; |
| import android.view.ViewTreeObserver.OnPreDrawListener; |
| |
| /** Static methods that are useful for scheduling actions to occur at a later time. */ |
| public class SchedulingUtils { |
| |
| |
| /** Runs a piece of code after the next layout run */ |
| public static void doAfterLayout(final View view, final Runnable runnable) { |
| final OnGlobalLayoutListener listener = new OnGlobalLayoutListener() { |
| @Override |
| public void onGlobalLayout() { |
| // Layout pass done, unregister for further events |
| view.getViewTreeObserver().removeOnGlobalLayoutListener(this); |
| runnable.run(); |
| } |
| }; |
| view.getViewTreeObserver().addOnGlobalLayoutListener(listener); |
| } |
| |
| /** Runs a piece of code just before the next draw, after layout and measurement */ |
| public static void doOnPreDraw(final View view, final boolean drawNextFrame, |
| final Runnable runnable) { |
| final OnPreDrawListener listener = new OnPreDrawListener() { |
| @Override |
| public boolean onPreDraw() { |
| view.getViewTreeObserver().removeOnPreDrawListener(this); |
| runnable.run(); |
| return drawNextFrame; |
| } |
| }; |
| view.getViewTreeObserver().addOnPreDrawListener(listener); |
| } |
| } |