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 17 package com.android.contacts.util; 18 19 import android.view.View; 20 import android.view.ViewTreeObserver.OnDrawListener; 21 import android.view.ViewTreeObserver.OnGlobalLayoutListener; 22 23 /** Static methods that are useful for scheduling actions to occur at a later time. */ 24 public 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
