Osmwithspace/MapComplete
1
0
Fork 0
forked from MapComplete/MapComplete
Code Pull requests Activity

Further stabilization of wikipedia box

Browse source
This commit is contained in:
Pieter Vander Vennet 2021-10-03 01:38:57 +02:00
parent 393d5d8932
commit a89d303ecd
15 changed files with 169 additions and 109 deletions
Download patch file Download diff file Expand all files Collapse all files

24
Logic/UIEventSource.ts
View file

@ -1,4 +1,5 @@
import {Utils} from "../Utils";
import * as Events from "events";
export class UIEventSource<T> {
@ -32,14 +33,14 @@ export class UIEventSource<T> {
return [];
}
public static flatten<X>(source: UIEventSource<UIEventSource<X>>, possibleSources: UIEventSource<any>[]): UIEventSource<X> {
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) {
for (const possibleSource of possibleSources ?? []) {
possibleSource?.addCallback(() => {
sink.setData(source.data?.data);
})
@ -186,6 +187,25 @@ export class UIEventSource<T> {
}
}
/**
* Monadic bind function
*/
public bind<X>(f: ((t: T) => UIEventSource<X>)): UIEventSource<X>{
const sink = new UIEventSource<X>( undefined )
const seenEventSources = new Set<UIEventSource<X>>();
this.addCallbackAndRun(data => {
const eventSource = f(data)
if(eventSource === undefined){
sink.setData(undefined)
}else if(!seenEventSources.has(eventSource)){
eventSource.addCallbackAndRun(mappedData => sink.setData(mappedData))
seenEventSources.add(eventSource)
}
})
return sink;
}
/**
* Monoidal map:
* Given a function 'f', will construct a new UIEventSource where the contents will always be "f(this.data)'