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 */
17package com.android.browser;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.graphics.Rect;
22import android.graphics.drawable.Drawable;
23import android.os.Handler;
24import android.os.Message;
25import android.util.AttributeSet;
26import android.widget.ImageView;
27
28/**
29 *
30 */
31public 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     */
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     */
58    public PageProgressView(Context context, AttributeSet attrs) {
59        super(context, attrs);
60        init(context);
61    }
62
63    /**
64     * @param context
65     */
66    public PageProgressView(Context context) {
67        super(context);
68        init(context);
69    }
70
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
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
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
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