forked from mystiq/hydrogen-web
7f50e3d137
so view models that should send updates through their collection can still use the same "emitChange" method on ViewModel
85 lines
2.7 KiB
JavaScript
85 lines
2.7 KiB
JavaScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// ViewModel should just be an eventemitter, not an ObservableValue
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// as in some cases it would really be more convenient to have multiple events (like telling the timeline to scroll down)
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// we do need to return a disposable from EventEmitter.on, or at least have a method here to easily track a subscription to an EventEmitter
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import {EventEmitter} from "../utils/EventEmitter.js";
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import {Disposables} from "../utils/Disposables.js";
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export class ViewModel extends EventEmitter {
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constructor({clock, emitChange} = {}) {
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super();
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this.disposables = null;
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this._options = {clock, emitChange};
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}
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childOptions(explicitOptions) {
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return Object.assign({}, this._options, explicitOptions);
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}
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track(disposable) {
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if (!this.disposables) {
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this.disposables = new Disposables();
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}
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this.disposables.track(disposable);
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return disposable;
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}
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dispose() {
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if (this.disposables) {
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this.disposables.dispose();
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}
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}
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disposeTracked(disposable) {
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if (this.disposables) {
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return this.disposables.disposeTracked(disposable);
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}
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return null;
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}
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// TODO: this will need to support binding
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// if any of the expr is a function, assume the function is a binding, and return a binding function ourselves
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//
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// translated string should probably always be bindings, unless we're fine with a refresh when changing the language?
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// we probably are, if we're using routing with a url, we could just refresh.
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i18n(parts, ...expr) {
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// just concat for now
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let result = "";
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for (let i = 0; i < parts.length; ++i) {
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result = result + parts[i];
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if (i < expr.length) {
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result = result + expr[i];
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}
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}
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return result;
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}
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emitChange(changedProps) {
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if (this._options.emitChange) {
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this._options.emitChange(changedProps);
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} else {
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this.emit("change", changedProps);
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}
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}
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get clock() {
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return this._options.clock;
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}
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}
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