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/*
* Copyright (C) 2021 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.launcher3.taskbar;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.view.View;
/**
* View that handles scrimming the taskbar and the inverted corners it draws. The scrim is used
* when bubbles is expanded.
*/
public class TaskbarScrimView extends View {
private final Paint mTaskbarScrimPaint;
private final Path mInvertedLeftCornerPath, mInvertedRightCornerPath;
private boolean mShowScrim;
private float mLeftCornerRadius, mRightCornerRadius;
private float mBackgroundHeight;
public TaskbarScrimView(Context context) {
this(context, null);
}
public TaskbarScrimView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public TaskbarScrimView(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public TaskbarScrimView(Context context, AttributeSet attrs, int defStyleAttr,
int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
mTaskbarScrimPaint = new Paint();
mTaskbarScrimPaint.setColor(getResources().getColor(android.R.color.system_neutral1_1000));
mTaskbarScrimPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
mTaskbarScrimPaint.setStyle(Paint.Style.FILL);
mInvertedLeftCornerPath = new Path();
mInvertedRightCornerPath = new Path();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mShowScrim) {
canvas.save();
canvas.translate(0, canvas.getHeight() - mBackgroundHeight);
// Scrim the taskbar itself.
canvas.drawRect(0, 0, canvas.getWidth(), mBackgroundHeight, mTaskbarScrimPaint);
// Scrim the inverted rounded corners above the taskbar.
canvas.translate(0, -mLeftCornerRadius);
canvas.drawPath(mInvertedLeftCornerPath, mTaskbarScrimPaint);
canvas.translate(0, mLeftCornerRadius);
canvas.translate(canvas.getWidth() - mRightCornerRadius, -mRightCornerRadius);
canvas.drawPath(mInvertedRightCornerPath, mTaskbarScrimPaint);
canvas.restore();
}
}
/**
* Sets the height of the taskbar background.
* @param height the height of the background.
*/
protected void setBackgroundHeight(float height) {
mBackgroundHeight = height;
if (mShowScrim) {
invalidate();
}
}
/**
* Sets the alpha of the taskbar scrim.
* @param alpha the alpha of the scrim.
*/
protected void setScrimAlpha(float alpha) {
mShowScrim = alpha > 0f;
mTaskbarScrimPaint.setAlpha((int) (alpha * 255));
invalidate();
}
/**
* Sets the radius of the left and right corners above the taskbar.
* @param leftCornerRadius the radius of the left corner.
* @param rightCornerRadius the radius of the right corner.
*/
protected void setCornerSizes(float leftCornerRadius, float rightCornerRadius) {
mLeftCornerRadius = leftCornerRadius;
mRightCornerRadius = rightCornerRadius;
Path square = new Path();
square.addRect(0, 0, mLeftCornerRadius, mLeftCornerRadius, Path.Direction.CW);
Path circle = new Path();
circle.addCircle(mLeftCornerRadius, 0, mLeftCornerRadius, Path.Direction.CW);
mInvertedLeftCornerPath.op(square, circle, Path.Op.DIFFERENCE);
square.reset();
square.addRect(0, 0, mRightCornerRadius, mRightCornerRadius, Path.Direction.CW);
circle.reset();
circle.addCircle(0, 0, mRightCornerRadius, Path.Direction.CW);
mInvertedRightCornerPath.op(square, circle, Path.Op.DIFFERENCE);
if (mShowScrim) {
invalidate();
}
}
}
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