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      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      */
     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