/* * Copyright (c) 2017-present Robert Jaros * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package pl.treksoft.kvision.html import com.github.snabbdom.VNode import org.w3c.dom.CanvasRenderingContext2D import org.w3c.dom.HTMLCanvasElement import pl.treksoft.kvision.core.Container import pl.treksoft.kvision.core.StringPair import pl.treksoft.kvision.core.Widget /** * Canvas component. * * @constructor * @param canvasWidth the width of the canvas * @param canvasHeight the height of the canvas * @param classes a set of CSS class names */ open class Canvas( canvasWidth: Int? = null, canvasHeight: Int? = null, classes: Set = setOf() ) : Widget(classes) { /** * The width of the canvas. */ var canvasWidth by refreshOnUpdate(canvasWidth) /** * The height of the canvas. */ var canvasHeight by refreshOnUpdate(canvasHeight) /** * The canvas rendering context. */ lateinit var context2D: CanvasRenderingContext2D init { this.vnkey = "kv_canvas_${counter++}" } override fun render(): VNode { return render("canvas") } override fun getSnAttrs(): List { val pr = super.getSnAttrs().toMutableList() canvasWidth?.let { pr.add("width" to it.toString()) } canvasHeight?.let { pr.add("height" to it.toString()) } return pr } override fun afterInsertInternal(node: VNode) { super.afterInsertInternal(node) context2D = (node.elm as HTMLCanvasElement).getContext("2d") as CanvasRenderingContext2D } companion object { internal var counter = 0 /** * DSL builder extension function. * * It takes the same parameters as the constructor of the built component. */ fun Container.canvas( canvasWidth: Int? = null, canvasHeight: Int? = null, classes: Set = setOf(), init: (Canvas.() -> Unit)? = null ): Canvas { val canvas = Canvas(canvasWidth, canvasHeight, classes).apply { init?.invoke(this) } this.add(canvas) return canvas } } }