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/*
* 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<String> = 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<StringPair> {
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<String> = setOf(),
init: (Canvas.() -> Unit)? = null
): Canvas {
val canvas =
Canvas(canvasWidth, canvasHeight, classes).apply { init?.invoke(this) }
this.add(canvas)
return canvas
}
}
}
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