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
17package com.android.gallery3d.photoeditor;
18
19import android.content.Context;
20import android.os.Handler;
21import android.os.Message;
22import android.util.AttributeSet;
23import android.view.MotionEvent;
24import android.view.View;
25import android.view.animation.Animation;
26import android.view.animation.AnimationUtils;
27import android.widget.RelativeLayout;
28
29import com.android.gallery3d.R;
30
31import java.util.ArrayList;
32import java.util.List;
33
34/**
35 * Toolbar that contains all tools and controls their idle/awake behaviors from UI thread.
36 */
37public class Toolbar extends RelativeLayout {
38
39    private final ToolbarIdleHandler idleHandler;
40
41    public Toolbar(Context context, AttributeSet attrs) {
42        super(context, attrs);
43
44        idleHandler = new ToolbarIdleHandler(context);
45        setOnHierarchyChangeListener(idleHandler);
46        idleHandler.killIdle();
47    }
48
49    @Override
50    public boolean dispatchTouchEvent(MotionEvent ev) {
51        idleHandler.killIdle();
52        return super.dispatchTouchEvent(ev);
53    }
54
55    private static class ToolbarIdleHandler implements OnHierarchyChangeListener {
56
57        private static final int MAKE_IDLE = 1;
58        private static final int TIMEOUT_IDLE = 8000;
59
60        private final List<View> childViews = new ArrayList<View>();
61        private final Handler mainHandler;
62        private final Animation fadeIn;
63        private final Animation fadeOut;
64        private boolean idle;
65
66        public ToolbarIdleHandler(Context context) {
67            mainHandler = new Handler() {
68
69                @Override
70                public void handleMessage(Message msg) {
71                    switch (msg.what) {
72                        case MAKE_IDLE:
73                            if (!idle) {
74                                idle = true;
75                                for (View view : childViews) {
76                                    view.startAnimation(fadeOut);
77                                }
78                            }
79                            break;
80                    }
81                }
82            };
83
84            fadeIn = AnimationUtils.loadAnimation(context, R.anim.photoeditor_fade_in);
85            fadeOut = AnimationUtils.loadAnimation(context, R.anim.photoeditor_fade_out);
86        }
87
88        public void killIdle() {
89            mainHandler.removeMessages(MAKE_IDLE);
90            if (idle) {
91                idle = false;
92                for (View view : childViews) {
93                    view.startAnimation(fadeIn);
94                }
95            }
96            mainHandler.sendEmptyMessageDelayed(MAKE_IDLE, TIMEOUT_IDLE);
97        }
98
99        @Override
100        public void onChildViewAdded(View parent, View child) {
101            // All child views, except photo-view, will fade out on inactivity timeout.
102            if (child.getId() != R.id.photo_view) {
103                childViews.add(child);
104            }
105        }
106
107        @Override
108        public void onChildViewRemoved(View parent, View child) {
109            childViews.remove(child);
110        }
111    }
112}
113