88 lines
2.8 KiB
JavaScript
88 lines
2.8 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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updateOptions(options) {
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this._options = Object.assign(this._options, options);
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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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