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
17package com.android.systemui.screenshot;
18
19import android.annotation.Nullable;
20import android.content.Context;
21import android.graphics.Canvas;
22import android.graphics.Color;
23import android.graphics.Paint;
24import android.graphics.Point;
25import android.graphics.PorterDuff;
26import android.graphics.PorterDuffXfermode;
27import android.graphics.Rect;
28import android.util.AttributeSet;
29import android.view.View;
30
31/**
32 * Draws a selection rectangle while taking screenshot
33 */
34public class ScreenshotSelectorView extends View {
35    private Point mStartPoint;
36    private Rect mSelectionRect;
37    private final Paint mPaintSelection, mPaintBackground;
38
39    public ScreenshotSelectorView(Context context) {
40        this(context, null);
41    }
42
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
51    public void startSelection(int x, int y) {
52        mStartPoint = new Point(x, y);
53        mSelectionRect = new Rect(x, y, x, y);
54    }
55
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
66    public Rect getSelectionRect() {
67        return mSelectionRect;
68    }
69
70    public void stopSelection() {
71        mStartPoint = null;
72        mSelectionRect = null;
73    }
74
75    @Override
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