1 /* 2 * Copyright (C) 2010 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.photoeditor; 18 19 import android.os.Handler; 20 import android.os.Message; 21 import android.view.View; 22 import android.view.ViewGroup; 23 import android.view.animation.Animation; 24 import android.view.animation.AnimationUtils; 25 26 import java.util.ArrayList; 27 import java.util.List; 28 29 /** 30 * Handler that controls idle/awake behaviors of toolbar's child views. 31 */ 32 class ToolbarIdleHandler { 33 34 private static final String IDLE_VIEW_TAG = "fadeOnIdle"; 35 private static final int MAKE_IDLE = 1; 36 private static final int TIMEOUT_IDLE = 8000; 37 38 private final List<View> childViews = new ArrayList<View>(); 39 private final Handler mainHandler; 40 private final Animation fadeIn; 41 private final Animation fadeOut; 42 private boolean idle; 43 44 /** 45 * Constructor should only be invoked after toolbar has done inflation and added all its child 46 * views; then its child views could be found by findViewById calls. 47 */ ToolbarIdleHandler(ViewGroup toolbar)48 public ToolbarIdleHandler(ViewGroup toolbar) { 49 mainHandler = new Handler() { 50 51 @Override 52 public void handleMessage(Message msg) { 53 switch (msg.what) { 54 case MAKE_IDLE: 55 if (!idle) { 56 idle = true; 57 for (View view : childViews) { 58 makeIdle(view); 59 } 60 } 61 break; 62 } 63 } 64 }; 65 66 fadeIn = AnimationUtils.loadAnimation(toolbar.getContext(), R.anim.fade_in); 67 fadeOut = AnimationUtils.loadAnimation(toolbar.getContext(), R.anim.fade_out); 68 69 for (int i = 0; i < toolbar.getChildCount(); i++) { 70 View view = toolbar.getChildAt(i); 71 String tag = (String) view.getTag(); 72 if ((tag != null) && tag.equals(IDLE_VIEW_TAG)) { 73 childViews.add(view); 74 } 75 } 76 // Alpha animations don't work well on scroll-view; apply them on container linear-layout. 77 childViews.add(toolbar.findViewById(R.id.effects_container)); 78 } 79 killIdle()80 public void killIdle() { 81 mainHandler.removeMessages(MAKE_IDLE); 82 if (idle) { 83 idle = false; 84 for (View view : childViews) { 85 makeAwake(view); 86 } 87 } 88 mainHandler.sendEmptyMessageDelayed(MAKE_IDLE, TIMEOUT_IDLE); 89 } 90 makeAwake(View view)91 private void makeAwake(View view) { 92 if (view.getVisibility() == View.VISIBLE) { 93 view.startAnimation(fadeIn); 94 } 95 } 96 makeIdle(View view)97 private void makeIdle(View view) { 98 if (view.getVisibility() == View.VISIBLE) { 99 view.startAnimation(fadeOut); 100 } 101 } 102 } 103