70 lines
3.0 KiB
JavaScript
70 lines
3.0 KiB
JavaScript
/*
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Copyright 2022 Bruno Windels <bruno@windels.cloud>
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Copyright 2022 The Matrix.org Foundation C.I.C.
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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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import {LightboxViewModel} from "./LightboxViewModel.js";
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// Store the `LightboxViewModel` under a symbol so no one else can tamper with
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// it. This acts like a private field on the class since no one else has the
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// symbol to look it up.
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let lightboxViewModelSymbol = Symbol('lightboxViewModel');
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/**
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* Destroys and creates a new the `LightboxViewModel` depending if
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* `lightboxChildOptions.eventEntry` or `lightboxChildOptions.eventId` are
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* provided.
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*/
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function updateLightboxViewModel(vm, fieldName, lightboxChildOptions) {
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// Remove any existing `LightboxViewModel` before we assemble the new one below
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if (vm[lightboxViewModelSymbol]) {
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vm[lightboxViewModelSymbol] = vm.disposeTracked(vm[lightboxViewModelSymbol]);
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// Let the `LightboxView` know that the `LightboxViewModel` has changed
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vm.emitChange(fieldName);
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}
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// Create the new `LightboxViewModel` if the `eventEntry` exists directly or
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// `eventId` which we can load from the store
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if (lightboxChildOptions.eventId || lightboxChildOptions.eventEntry) {
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vm[lightboxViewModelSymbol] = vm.track(new LightboxViewModel(vm.childOptions(lightboxChildOptions)));
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// Let the `LightboxView` know that the `LightboxViewModel` has changed
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vm.emitChange(fieldName);
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}
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}
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/**
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* Handles updating the `LightboxViewModel` whenever the page URL changes and
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* emits changes which the `LightboxView` will use to re-render. This is a
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* composable piece of logic to call in an existing `ViewModel`'s constructor.
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*/
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export function setupLightboxNavigation(vm, fieldName = 'lightboxViewModel', lightboxChildOptionsFunction) {
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// On the given `vm`, create a getter at `fieldName` that the
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// `LightboxViewModel` is exposed at for usage in the view.
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Object.defineProperty(vm, fieldName, {
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get: function() {
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return vm[lightboxViewModelSymbol];
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}
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});
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// Whenever the page navigates somewhere, keep the `lightboxViewModel` up to date
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const lightbox = vm.navigation.observe("lightbox");
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vm.track(lightbox.subscribe(eventId => {
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updateLightboxViewModel(vm, fieldName, lightboxChildOptionsFunction(eventId));
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}));
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// Also handle the case where the URL already includes `/lightbox/$eventId` (like
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// from page-load)
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const initialLightBoxEventId = lightbox.get();
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updateLightboxViewModel(vm, fieldName, lightboxChildOptionsFunction(initialLightBoxEventId));
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}
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