1 
2 /*
3  * Copyright (C) 2010 The Android Open Source Project
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 package com.android.browser;
18 
19 import android.content.Context;
20 import android.graphics.Canvas;
21 import android.graphics.Rect;
22 import android.graphics.drawable.Drawable;
23 import android.os.Handler;
24 import android.os.Message;
25 import android.util.AttributeSet;
26 import android.widget.ImageView;
27 
28 /**
29  *
30  */
31 public class PageProgressView extends ImageView {
32 
33     public static final int MAX_PROGRESS = 10000;
34     private static final int MSG_UPDATE = 42;
35     private static final int STEPS = 10;
36     private static final int DELAY = 40;
37 
38     private int mCurrentProgress;
39     private int mTargetProgress;
40     private int mIncrement;
41     private Rect mBounds;
42     private Handler mHandler;
43 
44     /**
45      * @param context
46      * @param attrs
47      * @param defStyle
48      */
PageProgressView(Context context, AttributeSet attrs, int defStyle)49     public PageProgressView(Context context, AttributeSet attrs, int defStyle) {
50         super(context, attrs, defStyle);
51         init(context);
52     }
53 
54     /**
55      * @param context
56      * @param attrs
57      */
PageProgressView(Context context, AttributeSet attrs)58     public PageProgressView(Context context, AttributeSet attrs) {
59         super(context, attrs);
60         init(context);
61     }
62 
63     /**
64      * @param context
65      */
PageProgressView(Context context)66     public PageProgressView(Context context) {
67         super(context);
68         init(context);
69     }
70 
init(Context ctx)71     private void init(Context ctx) {
72         mBounds = new Rect(0,0,0,0);
73         mCurrentProgress = 0;
74         mTargetProgress = 0;
75         mHandler = new Handler() {
76 
77             @Override
78             public void handleMessage(Message msg) {
79                 if (msg.what == MSG_UPDATE) {
80                     mCurrentProgress = Math.min(mTargetProgress,
81                             mCurrentProgress + mIncrement);
82                     mBounds.right = getWidth() * mCurrentProgress / MAX_PROGRESS;
83                     invalidate();
84                     if (mCurrentProgress < mTargetProgress) {
85                         sendMessageDelayed(mHandler.obtainMessage(MSG_UPDATE), DELAY);
86                     }
87                 }
88             }
89 
90         };
91     }
92 
93     @Override
onLayout(boolean f, int l, int t, int r, int b)94     public void onLayout(boolean f, int l, int t, int r, int b) {
95         mBounds.left = 0;
96         mBounds.right = (r - l) * mCurrentProgress / MAX_PROGRESS;
97         mBounds.top = 0;
98         mBounds.bottom = b-t;
99     }
100 
setProgress(int progress)101     void setProgress(int progress) {
102         mCurrentProgress = mTargetProgress;
103         mTargetProgress = progress;
104         mIncrement = (mTargetProgress - mCurrentProgress) / STEPS;
105         mHandler.removeMessages(MSG_UPDATE);
106         mHandler.sendEmptyMessage(MSG_UPDATE);
107     }
108 
109     @Override
onDraw(Canvas canvas)110     public void onDraw(Canvas canvas) {
111 //        super.onDraw(canvas);
112         Drawable d = getDrawable();
113         d.setBounds(mBounds);
114         d.draw(canvas);
115     }
116 
117 }
118