82 lines
2 KiB
TypeScript
82 lines
2 KiB
TypeScript
export class UIEventSource<T>{
|
|
|
|
public data: T;
|
|
private _callbacks = [];
|
|
|
|
constructor(data: T) {
|
|
this.data = data;
|
|
}
|
|
|
|
|
|
public addCallback(callback: ((latestData : T) => void)) {
|
|
this._callbacks.push(callback);
|
|
return this;
|
|
}
|
|
|
|
public setData(t: T): void {
|
|
if (this.data === t) {
|
|
return;
|
|
}
|
|
this.data = t;
|
|
this.ping();
|
|
}
|
|
|
|
public ping(): void {
|
|
for (const callback of this._callbacks) {
|
|
callback(this.data);
|
|
}
|
|
}
|
|
|
|
public static flatten<X>(source: UIEventSource<UIEventSource<X>>, possibleSources: UIEventSource<any>[]): UIEventSource<X> {
|
|
const sink = new UIEventSource<X>(source.data?.data);
|
|
|
|
source.addCallback((latestData) => {
|
|
sink.setData(latestData?.data);
|
|
});
|
|
|
|
for (const possibleSource of possibleSources) {
|
|
possibleSource.addCallback(() => {
|
|
sink.setData(source.data?.data);
|
|
|
|
})
|
|
}
|
|
|
|
return sink;
|
|
}
|
|
|
|
public map<J>(f: ((T) => J),
|
|
extraSources: UIEventSource<any>[] = []): UIEventSource<J> {
|
|
const self = this;
|
|
|
|
const update = function () {
|
|
newSource.setData(f(self.data));
|
|
newSource.ping();
|
|
}
|
|
|
|
this.addCallback(update);
|
|
for (const extraSource of extraSources) {
|
|
extraSource.addCallback(update);
|
|
}
|
|
const newSource = new UIEventSource<J>(
|
|
f(this.data)
|
|
);
|
|
|
|
|
|
return newSource;
|
|
|
|
}
|
|
|
|
|
|
public syncWith(otherSource: UIEventSource<T>) : UIEventSource<T>{
|
|
this.addCallback((latest) => otherSource.setData(latest));
|
|
const self = this;
|
|
otherSource.addCallback((latest) => self.setData(latest));
|
|
if(this.data === undefined){
|
|
this.setData(otherSource.data);
|
|
}else{
|
|
otherSource.setData(this.data);
|
|
}
|
|
return this;
|
|
}
|
|
|
|
} |