mapcomplete/UI/UIElement.ts
2020-10-08 19:03:00 +02:00

214 lines
5.9 KiB
TypeScript

import {UIEventSource} from "../Logic/UIEventSource";
export abstract class UIElement extends UIEventSource<string> {
private static nextId: number = 0;
public readonly id: string;
public readonly _source: UIEventSource<any>;
private clss: string[] = []
private style: string;
private _hideIfEmpty = false;
public dumbMode = false;
private lastInnerRender: string;
/**
* In the 'deploy'-step, some code needs to be run by ts-node.
* However, ts-node crashes when it sees 'document'. When running from console, we flag this and disable all code where document is needed.
* This is a workaround and yet another hack
*/
public static runningFromConsole = false;
protected constructor(source: UIEventSource<any> = undefined) {
super("");
this.id = "ui-element-" + UIElement.nextId;
this._source = source;
UIElement.nextId++;
this.dumbMode = true;
this.ListenTo(source);
}
public ListenTo(source: UIEventSource<any>) {
if (source === undefined) {
return this;
}
this.dumbMode = false;
const self = this;
source.addCallback(() => {
self.lastInnerRender = undefined;
self.Update();
})
return this;
}
private _onClick: () => void;
public onClick(f: (() => void)) {
this.dumbMode = false;
this._onClick = f;
this.SetClass("clickable")
this.Update();
return this;
}
private _onHover: UIEventSource<boolean>;
public IsHovered(): UIEventSource<boolean> {
this.dumbMode = false;
if (this._onHover !== undefined) {
return this._onHover;
}
// Note: we just save it. 'Update' will register that an eventsource exist and install the necessary hooks
this._onHover = new UIEventSource<boolean>(false);
return this._onHover;
}
Update(): void {
if (UIElement.runningFromConsole) {
return;
}
let element = document.getElementById(this.id);
if (element === undefined || element === null) {
// The element is not painted or, in the case of 'dumbmode' this UI-element is not explicitely present
if (this.dumbMode) {
// We update all the children anyway
this.UpdateAllChildren();
}
return;
}
const newRender = this.InnerRender();
if (newRender !== this.lastInnerRender) {
this.lastInnerRender = newRender;
this.setData(this.InnerRender());
element.innerHTML = this.data;
}
if (this._hideIfEmpty) {
if (element.innerHTML === "") {
element.parentElement.style.display = "none";
} else {
element.parentElement.style.display = "block";
}
}
if (this._onClick !== undefined) {
const self = this;
element.onclick = (e) => {
// @ts-ignore
if(e.consumed){
return;
}
self._onClick();
// @ts-ignore
e.consumed = true;
}
element.style.pointerEvents = "all";
element.style.cursor = "pointer";
}
if (this._onHover !== undefined) {
const self = this;
element.addEventListener('mouseover', () => self._onHover.setData(true));
element.addEventListener('mouseout', () => self._onHover.setData(false));
}
this.InnerUpdate(element);
this.UpdateAllChildren();
}
private UpdateAllChildren() {
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();
}
}
}
}
}
HideOnEmpty(hide: boolean) {
this._hideIfEmpty = hide;
this.Update();
return this;
}
// Called after the HTML has been replaced. Can be used for css tricks
protected InnerUpdate(htmlElement: HTMLElement) {
}
Render(): string {
this.lastInnerRender = this.InnerRender();
if (this.dumbMode) {
return this.lastInnerRender;
}
let style = "";
if (this.style !== undefined && this.style !== "") {
style = `style="${this.style}" `;
}
let clss = "";
if (this.clss.length > 0) {
clss = `class='${this.clss.join(" ")}' `;
}
return `<span ${clss}${style}id='${this.id}'>${this.lastInnerRender}</span>`
}
AttachTo(divId: string) {
this.dumbMode = false;
let element = document.getElementById(divId);
if (element === null) {
throw "SEVERE: could not attach UIElement to " + divId;
}
element.innerHTML = this.Render();
this.Update();
return this;
}
public abstract InnerRender(): string;
public IsEmpty(): boolean {
return this.InnerRender() === "";
}
public SetClass(clss: string): UIElement {
this.dumbMode = false;
if (clss === "" && this.clss.length > 0) {
throw "Use RemoveClass instead";
} else if (this.clss.indexOf(clss) < 0) {
this.clss.push(clss);
this.Update();
}
return this;
}
public RemoveClass(clss: string): UIElement {
const i = this.clss.indexOf(clss);
if (i >= 0) {
this.clss.splice(i, 1);
this.Update();
}
return this;
}
public SetStyle(style: string): UIElement {
this.dumbMode = false;
this.style = style;
this.Update();
return this;
}
}