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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.browser;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.widget.ImageView;
/**
*
*/
public class PageProgressView extends ImageView {
public static final int MAX_PROGRESS = 10000;
private static final int MSG_UPDATE = 42;
private static final int STEPS = 10;
private static final int DELAY = 40;
private int mCurrentProgress;
private int mTargetProgress;
private int mIncrement;
private Rect mBounds;
private Handler mHandler;
/**
* @param context
* @param attrs
* @param defStyle
*/
public PageProgressView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
/**
* @param context
* @param attrs
*/
public PageProgressView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
/**
* @param context
*/
public PageProgressView(Context context) {
super(context);
init(context);
}
private void init(Context ctx) {
mBounds = new Rect(0,0,0,0);
mCurrentProgress = 0;
mTargetProgress = 0;
mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == MSG_UPDATE) {
mCurrentProgress = Math.min(mTargetProgress,
mCurrentProgress + mIncrement);
mBounds.right = getWidth() * mCurrentProgress / MAX_PROGRESS;
invalidate();
if (mCurrentProgress < mTargetProgress) {
sendMessageDelayed(mHandler.obtainMessage(MSG_UPDATE), DELAY);
}
}
}
};
}
@Override
public void onLayout(boolean f, int l, int t, int r, int b) {
mBounds.left = 0;
mBounds.right = (r - l) * mCurrentProgress / MAX_PROGRESS;
mBounds.top = 0;
mBounds.bottom = b-t;
}
void setProgress(int progress) {
mCurrentProgress = mTargetProgress;
mTargetProgress = progress;
mIncrement = (mTargetProgress - mCurrentProgress) / STEPS;
mHandler.removeMessages(MSG_UPDATE);
mHandler.sendEmptyMessage(MSG_UPDATE);
}
@Override
public void onDraw(Canvas canvas) {
// super.onDraw(canvas);
Drawable d = getDrawable();
d.setBounds(mBounds);
d.draw(canvas);
}
}
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