74 lines
2.7 KiB
TypeScript
74 lines
2.7 KiB
TypeScript
import {UIElement} from "./UIElement";
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import {UIEventSource} from "./UIEventSource";
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export class SlideShow extends UIElement {
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private readonly _embeddedElements: UIEventSource<UIElement[]>
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private readonly _currentSlide: UIEventSource<number> = new UIEventSource<number>(0);
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private readonly _title: UIElement;
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private readonly _noimages: UIElement;
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constructor(
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title: UIElement,
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embeddedElements: UIEventSource<UIElement[]>,
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noImages: UIElement) {
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super(embeddedElements);
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this._title = title;
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this._embeddedElements = embeddedElements;
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this.ListenTo(this._currentSlide);
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this._noimages = noImages;
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}
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protected InnerRender(): string {
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if (this._embeddedElements.data.length == 0) {
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return this._noimages.Render();
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}
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const prevBtn = "<input class='prev-button' type='button' onclick='console.log(\"prev\")' value='<' />"
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const nextBtn = "<input class='next-button' type='button' onclick='console.log(\"nxt\")' value='>' />"
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let header = this._title.Render();
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if (this._embeddedElements.data.length > 1) {
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header = header + prevBtn + (this._currentSlide.data + 1) + "/" + this._embeddedElements.data.length + nextBtn;
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}
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let body = ""
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for (let i = 0; i < this._embeddedElements.data.length; i++) {
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let embeddedElement = this._embeddedElements.data[i];
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let state = "hidden"
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if (this._currentSlide.data === i) {
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state = "active-slide";
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}
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body += " <div class=\"slide " + state + "\">" + embeddedElement.Render() + "</div>\n";
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}
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return "<span class='image-slideshow'>" + header + body + "</span>";
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}
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InnerUpdate(htmlElement) {
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const nextButton = htmlElement.getElementsByClassName('next-button')[0];
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if(nextButton === undefined){
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return;
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}
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const prevButton = htmlElement.getElementsByClassName('prev-button')[0];
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const self = this;
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nextButton.onclick = () => {
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const current = self._currentSlide.data;
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const next = (current + 1) % self._embeddedElements.data.length;
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self._currentSlide.setData(next);
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}
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prevButton.onclick = () => {
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const current = self._currentSlide.data;
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let prev = (current - 1);
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if (prev < 0) {
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prev = self._embeddedElements.data.length - 1;
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}
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self._currentSlide.setData(prev);
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}
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}
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Activate() {
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for (const embeddedElement of this._embeddedElements.data) {
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embeddedElement.Activate();
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}
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}
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} |