mapcomplete/UI/Image/SlideShow.ts
Pieter Vander Vennet a721d3137a Optimize rendering
2020-10-14 12:15:09 +02:00

88 lines
No EOL
2.9 KiB
TypeScript

import {UIEventSource} from "../../Logic/UIEventSource";
import {UIElement} from "../UIElement";
import {FixedUiElement} from "../Base/FixedUiElement";
export class SlideShow extends UIElement {
private readonly _embeddedElements: UIEventSource<UIElement[]>
public readonly _currentSlide: UIEventSource<number> = new UIEventSource<number>(0);
private _prev: UIElement;
private _next: UIElement;
constructor(
embeddedElements: UIEventSource<UIElement[]>) {
super(embeddedElements);
this._embeddedElements = embeddedElements;
this.ListenTo(this._currentSlide);
this._embeddedElements
.stabilized(1000)
.addCallback(embedded => {
// Always move to the last image - but at most once per second
this._currentSlide.setData(this._embeddedElements.data.length - 1);
});
const self = this;
this._prev = new FixedUiElement("<div class='prev-button'>" +
"<div class='vspan'></div>" +
"<img src='assets/arrow-left-smooth.svg' alt='Prev'/>" +
"</div>")
.onClick(() => {
const current = self._currentSlide.data;
self.MoveTo(current - 1);
});
this._next = new FixedUiElement("<div class='next-button'>" +
"<div class='vspan'></div>" +
"<img src='assets/arrow-right-smooth.svg' alt='Next'/>" +
"</div>")
.onClick(() => {
const current = self._currentSlide.data;
self.MoveTo(current + 1);
});
}
InnerRender(): string {
if (this._embeddedElements.data.length == 0) {
return "";
}
if (this._embeddedElements.data.length == 1) {
return "<div class='image-slideshow'><div class='slides'><div class='slide'>" +
this._embeddedElements.data[0].Render() +
"</div></div></div>";
}
let slides = ""
for (let i = 0; i < this._embeddedElements.data.length; i++) {
let embeddedElement = this._embeddedElements.data[i];
let state = "hidden"
if (this._currentSlide.data === i) {
state = "active-slide";
}
slides += " <div class=\"slide " + state + "\">" + embeddedElement.Render() + "</div>\n";
}
return "<div class='image-slideshow'>"
+ this._prev.Render()
+ "<div class='slides'>" + slides + "</div>"
+ this._next.Render()
+ "</div>";
}
public MoveTo(index: number) {
if (index < 0) {
index = this._embeddedElements.data.length - 1;
}
index = index % this._embeddedElements.data.length;
this._currentSlide.setData(index);
}
Update() {
super.Update();
for (const uiElement of this._embeddedElements.data) {
uiElement.Update();
}
}
}