BitmapView.java revision 89e59f00d67791754e44e65413baa95f94056df4 
1/*
2 * Copyright (C) 2013 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.example.bitmapsample;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.util.AttributeSet;
22import android.widget.ListView;
23
24import com.android.bitmap.drawable.ExtendedBitmapDrawable;
25import com.android.bitmap.view.BitmapDrawableImageView;
26
27public class BitmapView extends BitmapDrawableImageView {
28    private final float mDensity;
29
30    private ListView mListView;
31
32    public BitmapView(Context c) {
33        this(c, null);
34    }
35
36    public BitmapView(Context c, AttributeSet attrs) {
37        super(c, attrs);
38        mDensity = getResources().getDisplayMetrics().density;
39    }
40
41    @Override
42    protected int getSuggestedMinimumHeight() {
43        return (int) (100 * mDensity);
44    }
45
46    @Override
47    protected void onSizeChanged(final int w, final int h, int oldw, int oldh) {
48        ExtendedBitmapDrawable drawable = getTypedDrawable();
49        drawable.setDecodeDimensions(w, h);
50    }
51
52    public void setListView(final ListView listView) {
53        mListView = listView;
54    }
55
56    @Override
57    protected void onDraw(final Canvas canvas) {
58        ExtendedBitmapDrawable drawable = getTypedDrawable();
59        float fraction = (float) getBottom() / (mListView.getHeight() + getHeight());
60        drawable.setParallaxFraction(fraction);
61
62        super.onDraw(canvas);
63    }
64}