80 lines
1.9 KiB
Kotlin
80 lines
1.9 KiB
Kotlin
package nl.astraeus.komp
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import kotlinx.html.HtmlBlockTag
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import kotlinx.html.TagConsumer
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import kotlinx.html.dom.create
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import org.w3c.dom.HTMLDivElement
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import org.w3c.dom.HTMLElement
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import org.w3c.dom.Node
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import org.w3c.dom.css.CSSStyleDeclaration
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import kotlin.browser.document
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fun HtmlBlockTag.include(component: Komponent) {
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component.render(this.consumer as TagConsumer<HTMLElement>)
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}
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abstract class Komponent {
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var element: Node? = null
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val declaredStyles: MutableMap<String, CSSStyleDeclaration> = HashMap()
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open fun create(): HTMLElement {
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val result = render(document.create)
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return result
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}
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abstract fun render(consumer: TagConsumer<HTMLElement>): HTMLElement
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open fun declareStyle(className: String, block: CSSStyleDeclaration.() -> Unit) {
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val style = (document.createElement("div") as HTMLDivElement).style
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block(style)
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declaredStyles[className] = style
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}
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open fun refresh() {
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element?.let { element ->
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if (logRenderEvent) {
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console.log("Rendering", this)
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}
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val newElement = create()
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element.parentNode?.replaceChild(newElement, element)
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this.element = newElement
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}
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}
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open fun update() {
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refresh()
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}
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companion object {
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var logRenderEvent = false
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var logReplaceEvent = false
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fun removeElement(element: Node) {
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val parent = element.parentElement ?: throw IllegalArgumentException("Element has no parent!?")
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if (logReplaceEvent) {
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console.log("Remove", element)
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}
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parent.removeChild(element)
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}
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fun create(parent: HTMLElement, component: Komponent, insertAsFirst: Boolean = false) {
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val element = component.create()
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if (insertAsFirst && parent.childElementCount > 0) {
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parent.insertBefore(element, parent.firstChild)
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} else {
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parent.appendChild(element)
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}
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component.element = element
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}
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}
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}
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