1 /*
2  * Copyright (C) 2016 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.systemui.screenshot;
18 
19 import android.annotation.Nullable;
20 import android.content.Context;
21 import android.graphics.Canvas;
22 import android.graphics.Color;
23 import android.graphics.Paint;
24 import android.graphics.Point;
25 import android.graphics.PorterDuff;
26 import android.graphics.PorterDuffXfermode;
27 import android.graphics.Rect;
28 import android.util.AttributeSet;
29 import android.view.View;
30 
31 /**
32  * Draws a selection rectangle while taking screenshot
33  */
34 public class ScreenshotSelectorView extends View {
35     private Point mStartPoint;
36     private Rect mSelectionRect;
37     private final Paint mPaintSelection, mPaintBackground;
38 
ScreenshotSelectorView(Context context)39     public ScreenshotSelectorView(Context context) {
40         this(context, null);
41     }
42 
ScreenshotSelectorView(Context context, @Nullable AttributeSet attrs)43     public ScreenshotSelectorView(Context context, @Nullable AttributeSet attrs) {
44         super(context, attrs);
45         mPaintBackground = new Paint(Color.BLACK);
46         mPaintBackground.setAlpha(160);
47         mPaintSelection = new Paint(Color.TRANSPARENT);
48         mPaintSelection.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
49     }
50 
startSelection(int x, int y)51     public void startSelection(int x, int y) {
52         mStartPoint = new Point(x, y);
53         mSelectionRect = new Rect(x, y, x, y);
54     }
55 
updateSelection(int x, int y)56     public void updateSelection(int x, int y) {
57         if (mSelectionRect != null) {
58             mSelectionRect.left = Math.min(mStartPoint.x, x);
59             mSelectionRect.right = Math.max(mStartPoint.x, x);
60             mSelectionRect.top = Math.min(mStartPoint.y, y);
61             mSelectionRect.bottom = Math.max(mStartPoint.y, y);
62             invalidate();
63         }
64     }
65 
getSelectionRect()66     public Rect getSelectionRect() {
67         return mSelectionRect;
68     }
69 
stopSelection()70     public void stopSelection() {
71         mStartPoint = null;
72         mSelectionRect = null;
73     }
74 
75     @Override
draw(Canvas canvas)76     public void draw(Canvas canvas) {
77         canvas.drawRect(mLeft, mTop, mRight, mBottom, mPaintBackground);
78         if (mSelectionRect != null) {
79             canvas.drawRect(mSelectionRect, mPaintSelection);
80         }
81     }
82 }
83