1 /*
2  * Copyright (C) 2015 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 
17 package com.android.camera.ui;
18 
19 import android.graphics.Canvas;
20 import android.graphics.ColorFilter;
21 import android.graphics.Paint;
22 import android.graphics.PixelFormat;
23 import android.graphics.Rect;
24 import android.graphics.RectF;
25 import android.graphics.drawable.Drawable;
26 
27 /**
28  * Drawable that takes a {@link RectF} as a screen, and draws around that
29  * screen to fill margins between the screen and the edge of the {@link Canvas}
30  * when drawing.
31  */
32 public class MarginDrawable extends Drawable {
33 
34     private RectF mScreen = new RectF(0, 0, 0, 0);
35     private final Paint mPaint;
36 
MarginDrawable(int color)37     public MarginDrawable(int color) {
38         super();
39 
40         mPaint = new Paint();
41         mPaint.setAntiAlias(true);
42         mPaint.setColor(color);
43     }
44 
45     /**
46      * Set the screen around which will be drawn margins. If the screen rect
47      * has no area (zero width or height), no margins will be drawn.
48      *
49      * @param screen A {@link RectF} describing the screen dimensions
50      */
setScreen(RectF screen)51     public void setScreen(RectF screen) {
52         mScreen.set(screen);
53         invalidateSelf();
54     }
55 
56     @Override
draw(Canvas canvas)57     public void draw(Canvas canvas) {
58         RectF s = mScreen;
59         if (s.top < s.bottom && s.left < s.right) {
60             Rect cb = canvas.getClipBounds();
61             if (s.top > 0) {
62                 canvas.drawRect(0, 0, cb.right, s.top + 1, mPaint);
63             }
64             if (s.left > 0) {
65                 canvas.drawRect(0, s.top, s.left + 1, s.bottom, mPaint);
66             }
67             if (s.right < cb.right) {
68                 canvas.drawRect(s.right - 1, s.top, cb.right, s.bottom, mPaint);
69             }
70             if (s.bottom < cb.bottom) {
71                 canvas.drawRect(0, s.bottom - 1, cb.right, cb.bottom, mPaint);
72             }
73         }
74     }
75 
76     @Override
setAlpha(int alpha)77     public void setAlpha(int alpha) {
78     }
79 
80     @Override
setColorFilter(ColorFilter cf)81     public void setColorFilter(ColorFilter cf) {
82     }
83 
84     @Override
getOpacity()85     public int getOpacity() {
86         return PixelFormat.OPAQUE;
87     }
88 }
89