Muyuan Li | 6ca619f | 2016-03-08 13:30:42 -0800 | [diff] [blame] | 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 | |
| 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 | } |