| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| |
| package com.android.systemui.screenshot; |
| |
| import android.annotation.Nullable; |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.Paint; |
| import android.graphics.Point; |
| import android.graphics.PorterDuff; |
| import android.graphics.PorterDuffXfermode; |
| import android.graphics.Rect; |
| import android.util.AttributeSet; |
| import android.view.MotionEvent; |
| import android.view.View; |
| |
| import java.util.function.Consumer; |
| |
| /** |
| * Draws a selection rectangle while taking screenshot |
| */ |
| public class ScreenshotSelectorView extends View { |
| private Point mStartPoint; |
| private Rect mSelectionRect; |
| private final Paint mPaintSelection, mPaintBackground; |
| |
| private Consumer<Rect> mOnScreenshotSelected; |
| |
| public ScreenshotSelectorView(Context context) { |
| this(context, null); |
| } |
| |
| public ScreenshotSelectorView(Context context, @Nullable AttributeSet attrs) { |
| super(context, attrs); |
| mPaintBackground = new Paint(Color.BLACK); |
| mPaintBackground.setAlpha(160); |
| mPaintSelection = new Paint(Color.TRANSPARENT); |
| mPaintSelection.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); |
| |
| setOnTouchListener((v, event) -> { |
| switch (event.getAction()) { |
| case MotionEvent.ACTION_DOWN: |
| startSelection((int) event.getX(), (int) event.getY()); |
| return true; |
| case MotionEvent.ACTION_MOVE: |
| updateSelection((int) event.getX(), (int) event.getY()); |
| return true; |
| case MotionEvent.ACTION_UP: |
| setVisibility(View.GONE); |
| final Rect rect = getSelectionRect(); |
| if (mOnScreenshotSelected != null |
| && rect != null |
| && rect.width() != 0 && rect.height() != 0) { |
| mOnScreenshotSelected.accept(rect); |
| } |
| stopSelection(); |
| return true; |
| } |
| return false; |
| }); |
| } |
| |
| @Override |
| public void draw(Canvas canvas) { |
| canvas.drawRect(mLeft, mTop, mRight, mBottom, mPaintBackground); |
| if (mSelectionRect != null) { |
| canvas.drawRect(mSelectionRect, mPaintSelection); |
| } |
| } |
| |
| void setOnScreenshotSelected(Consumer<Rect> onScreenshotSelected) { |
| mOnScreenshotSelected = onScreenshotSelected; |
| } |
| |
| void stop() { |
| if (getSelectionRect() != null) { |
| stopSelection(); |
| } |
| } |
| |
| private void startSelection(int x, int y) { |
| mStartPoint = new Point(x, y); |
| mSelectionRect = new Rect(x, y, x, y); |
| } |
| |
| private void updateSelection(int x, int y) { |
| if (mSelectionRect != null) { |
| mSelectionRect.left = Math.min(mStartPoint.x, x); |
| mSelectionRect.right = Math.max(mStartPoint.x, x); |
| mSelectionRect.top = Math.min(mStartPoint.y, y); |
| mSelectionRect.bottom = Math.max(mStartPoint.y, y); |
| invalidate(); |
| } |
| } |
| |
| private Rect getSelectionRect() { |
| return mSelectionRect; |
| } |
| |
| private void stopSelection() { |
| mStartPoint = null; |
| mSelectionRect = null; |
| } |
| } |