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-rw-r--r--src/main/kotlin/pl/treksoft/kvision/html/Canvas.kt91
1 files changed, 91 insertions, 0 deletions
diff --git a/src/main/kotlin/pl/treksoft/kvision/html/Canvas.kt b/src/main/kotlin/pl/treksoft/kvision/html/Canvas.kt
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+++ b/src/main/kotlin/pl/treksoft/kvision/html/Canvas.kt
@@ -0,0 +1,91 @@
+/*
+ * 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
+
+ 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 afterInsert(node: VNode) {
+ context2D = (node.elm as HTMLCanvasElement).getContext("2d") as CanvasRenderingContext2D
+ }
+
+ companion object {
+ /**
+ * 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
+ }
+ }
+}