mapcomplete/UI/UIElement.ts

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import {UIEventSource} from "./UIEventSource";
export abstract class UIElement {
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private static nextId: number = 0;
public readonly id: string;
public readonly _source: UIEventSource<any>;
private _hideIfEmpty = false;
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protected constructor(source: UIEventSource<any>) {
this.id = "ui-element-" + UIElement.nextId;
this._source = source;
UIElement.nextId++;
this.ListenTo(source);
}
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public ListenTo(source: UIEventSource<any>) {
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if (source === undefined) {
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return;
}
const self = this;
source.addCallback(() => {
self.Update();
})
}
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private _onClick: () => void;
public onClick(f: (() => void)) {
this._onClick = f;
this.Update();
return this;
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}
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Update(): void {
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let element = document.getElementById(this.id);
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if (element === undefined || element === null) {
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// The element is not painted
return;
}
element.innerHTML = this.InnerRender();
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if (this._hideIfEmpty) {
if (element.innerHTML === "") {
element.parentElement.style.display = "none";
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} else {
element.parentElement.style.display = undefined;
}
}
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if (this._onClick !== undefined) {
const self = this;
element.onclick = () => {
self._onClick();
}
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element.style.pointerEvents = "all";
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element.style.cursor = "pointer";
}
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this.InnerUpdate(element);
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for (const i in this) {
const child = this[i];
if (child instanceof UIElement) {
child.Update();
} else if (child instanceof Array) {
for (const ch of child) {
if (ch instanceof UIElement) {
ch.Update();
}
}
}
}
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}
HideOnEmpty(hide : boolean){
this._hideIfEmpty = hide;
this.Update();
return this;
}
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// Called after the HTML has been replaced. Can be used for css tricks
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protected InnerUpdate(htmlElement: HTMLElement) {
}
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Render(): string {
return "<span class='uielement' id='" + this.id + "'>" + this.InnerRender() + "</span>"
}
AttachTo(divId: string) {
let element = document.getElementById(divId);
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if (element === null) {
console.log("SEVERE: could not attach UIElement to ", divId);
return;
}
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element.innerHTML = this.Render();
this.Update();
return this;
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}
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public abstract InnerRender(): string;
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public Activate(): void {
for (const i in this) {
const child = this[i];
if (child instanceof UIElement) {
child.Activate();
} else if (child instanceof Array) {
for (const ch of child) {
if (ch instanceof UIElement) {
ch.Activate();
}
}
}
}
};
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public IsEmpty(): boolean {
return this.InnerRender() === "";
}
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}
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