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bind key for spontaneous updates in MappedMap

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so we just have to pass in the params
This commit is contained in:
Bruno Windels 2020-08-12 17:38:40 +02:00
parent cb10d40c3a
commit fbf72b8825
1 changed files with 14 additions and 11 deletions
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25
src/observable/map/MappedMap.js
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@ -16,7 +16,7 @@ limitations under the License.
import {BaseObservableMap} from "./BaseObservableMap.js";
/*
so a mapped value can emit updates on it's own with this._updater that is passed in the mapping function
so a mapped value can emit updates on it's own with this._emitSpontaneousUpdate that is passed in the mapping function
how should the mapped value be notified of an update though? and can it then decide to not propagate the update?
*/
export class MappedMap extends BaseObservableMap {
@ -25,14 +25,18 @@ export class MappedMap extends BaseObservableMap {
this._source = source;
this._mapper = mapper;
this._mappedValues = new Map();
this._updater = (key, params) => { // this should really be (value, params) but can't make that work for now
const value = this._mappedValues.get(key);
this.onUpdate(key, value, params);
};
}
_emitSpontaneousUpdate(key, params) {
const value = this._mappedValues.get(key);
if (value) {
this.emitUpdate(key, value, params);
}
}
onAdd(key, value) {
const mappedValue = this._mapper(value, this._updater);
const emitSpontaneousUpdate = this._emitSpontaneousUpdate.bind(this, key);
const mappedValue = this._mapper(value, emitSpontaneousUpdate);
this._mappedValues.set(key, mappedValue);
this.emitAdd(key, mappedValue);
}
@ -47,17 +51,16 @@ export class MappedMap extends BaseObservableMap {
onUpdate(key, value, params) {
const mappedValue = this._mappedValues.get(key);
if (mappedValue !== undefined) {
const newParams = this._updater(value, params);
// if (newParams !== undefined) {
this.emitUpdate(key, mappedValue, newParams);
// }
// TODO: map params somehow if needed?
this.emitUpdate(key, mappedValue, params);
}
}
onSubscribeFirst() {
this._subscription = this._source.subscribe(this);
for (let [key, value] of this._source) {
const mappedValue = this._mapper(value, this._updater);
const emitSpontaneousUpdate = this._emitSpontaneousUpdate.bind(this, key);
const mappedValue = this._mapper(value, emitSpontaneousUpdate);
this._mappedValues.set(key, mappedValue);
}
super.onSubscribeFirst();