67 lines
2.4 KiB
Kotlin
67 lines
2.4 KiB
Kotlin
/*
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* Copyright (C) 2017 JRummy Apps Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.jrummyapps.android.colorpicker
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import android.graphics.Canvas
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import android.graphics.Color
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import android.graphics.ColorFilter
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import android.graphics.Paint
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import android.graphics.PixelFormat
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import android.graphics.Rect
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import android.graphics.drawable.Drawable
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import kotlin.math.min
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/**
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* This drawable will draw a simple white and gray chessboard pattern.
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* It's the pattern you will often see as a background behind a partly transparent image in many applications.
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*/
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internal class TilePatternDrawable(
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private val rectangleSize: Int,
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) : Drawable() {
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private val rect = Rect()
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private val paintWhite = Paint().apply { color = Color.WHITE }
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private val paintGray = Paint().apply { color = -0x343434 }
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override fun draw(canvas: Canvas) {
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val xEnd = bounds.right
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val yEnd = bounds.bottom
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var verticalStartWhite = true
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for (y in bounds.top until yEnd step rectangleSize) {
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rect.top = y
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rect.bottom = min(yEnd, y + rectangleSize)
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var isWhite = verticalStartWhite
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for (x in bounds.left until xEnd step rectangleSize) {
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rect.left = x
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rect.right = min(xEnd, x + rectangleSize)
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canvas.drawRect(rect, if (isWhite) paintWhite else paintGray)
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isWhite = !isWhite
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}
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verticalStartWhite = !verticalStartWhite
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}
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}
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@Suppress("OVERRIDE_DEPRECATION")
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override fun getOpacity() = PixelFormat.OPAQUE
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override fun setAlpha(alpha: Int) {
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throw UnsupportedOperationException("Alpha is not supported by this drawable.")
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}
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override fun setColorFilter(cf: ColorFilter?) {
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throw UnsupportedOperationException("ColorFilter is not supported by this drawable.")
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}
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}
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