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.android.camera.tinyplanet;
18
19import android.content.Context;
20import android.graphics.Bitmap;
21import android.graphics.Canvas;
22import android.graphics.Paint;
23import android.util.AttributeSet;
24import android.view.View;
25
26import java.util.concurrent.locks.Lock;
27
28/**
29 * Shows a preview of the TinyPlanet on the screen while editing.
30 */
31public class TinyPlanetPreview extends View {
32    /**
33     * Classes implementing this interface get informed about changes to the
34     * preview size.
35     */
36    public static interface PreviewSizeListener {
37        /**
38         * Called when the preview size has changed.
39         *
40         * @param sizePx the size in pixels of the square preview area
41         */
42        public void onSizeChanged(int sizePx);
43    }
44
45    private Paint mPaint = new Paint();
46    private Bitmap mPreview;
47    private Lock mLock;
48    private PreviewSizeListener mPreviewSizeListener;
49    private int mSize = 0;
50
51    public TinyPlanetPreview(Context context) {
52        super(context);
53    }
54
55    public TinyPlanetPreview(Context context, AttributeSet attrs) {
56        super(context, attrs);
57    }
58
59    public TinyPlanetPreview(Context context, AttributeSet attrs, int defStyle) {
60        super(context, attrs, defStyle);
61    }
62
63    /**
64     * Sets the bitmap and waits for a draw to happen before returning.
65     */
66    public void setBitmap(Bitmap preview, Lock lock) {
67        mPreview = preview;
68        mLock = lock;
69        invalidate();
70    }
71
72    public void setPreviewSizeChangeListener(PreviewSizeListener listener) {
73        mPreviewSizeListener = listener;
74        if (mSize > 0) {
75            mPreviewSizeListener.onSizeChanged(mSize);
76        }
77    }
78
79    @Override
80    protected void onDraw(Canvas canvas) {
81        super.onDraw(canvas);
82        if (mLock != null && mLock.tryLock()) {
83            try {
84                if (mPreview != null && !mPreview.isRecycled()) {
85                    canvas.drawBitmap(mPreview, 0, 0, mPaint);
86                }
87            } finally {
88                mLock.unlock();
89            }
90        }
91    }
92
93    @Override
94    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
95        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
96
97        // Make sure the view is square
98        int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
99        setMeasuredDimension(size, size);
100    }
101
102    @Override
103    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
104        super.onLayout(changed, left, top, right, bottom);
105        if (changed && mPreviewSizeListener != null) {
106            int width = right - left;
107            int height = bottom - top;
108
109            // These should be the same as we enforce a square layout, but let's
110            // be safe.
111            int mSize = Math.min(width, height);
112
113            // Tell the listener about our new size so the renderer can adapt.
114            if (mSize > 0 && mPreviewSizeListener != null) {
115                mPreviewSizeListener.onSizeChanged(mSize);
116            }
117        }
118    }
119}
120