mirror of
https://github.com/element-hq/element-web.git
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110 lines
3.8 KiB
JavaScript
110 lines
3.8 KiB
JavaScript
/*
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Copyright 2015, 2016 OpenMarket Ltd
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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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class Skinner {
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constructor() {
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this.components = null;
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}
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getComponent(name) {
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if (this.components === null) {
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throw new Error(
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"Attempted to get a component before a skin has been loaded."+
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" This is probably because either:"+
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" a) Your app has not called sdk.loadSkin(), or"+
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" b) A component has called getComponent at the root level",
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);
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}
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const doLookup = (components) => {
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if (!components) return null;
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let comp = components[name];
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// XXX: Temporarily also try 'views.' as we're currently
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// leaving the 'views.' off views.
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if (!comp) {
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comp = components['views.' + name];
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}
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return comp;
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};
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// Check the skin first
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let comp = doLookup(this.components);
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// If that failed, check against our own components
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if (!comp) {
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// Lazily load our own components because they might end up calling .getComponent()
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comp = doLookup(require("./component-index").components);
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}
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// Just return nothing instead of erroring - the consumer should be smart enough to
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// handle this at this point.
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if (!comp) {
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return null;
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}
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// components have to be functions.
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const validType = typeof comp === 'function';
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if (!validType) {
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throw new Error(`Not a valid component: ${name} (type = ${typeof(comp)}).`);
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}
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return comp;
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}
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load(skinObject) {
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if (this.components !== null) {
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throw new Error(
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"Attempted to load a skin while a skin is already loaded"+
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"If you want to change the active skin, call resetSkin first");
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}
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this.components = {};
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const compKeys = Object.keys(skinObject.components);
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for (let i = 0; i < compKeys.length; ++i) {
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const comp = skinObject.components[compKeys[i]];
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this.addComponent(compKeys[i], comp);
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}
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}
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addComponent(name, comp) {
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let slot = name;
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if (comp.replaces !== undefined) {
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if (comp.replaces.indexOf('.') > -1) {
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slot = comp.replaces;
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} else {
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slot = name.substr(0, name.lastIndexOf('.') + 1) + comp.replaces.split('.').pop();
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}
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}
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this.components[slot] = comp;
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}
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reset() {
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this.components = null;
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}
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}
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// We define one Skinner globally, because the intention is
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// very much that it is a singleton. Relying on there only being one
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// copy of the module can be dicey and not work as browserify's
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// behaviour with multiple copies of files etc. is erratic at best.
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// XXX: We can still end up with the same file twice in the resulting
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// JS bundle which is nonideal.
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// See https://derickbailey.com/2016/03/09/creating-a-true-singleton-in-node-js-with-es6-symbols/
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// or https://nodejs.org/api/modules.html#modules_module_caching_caveats
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// ("Modules are cached based on their resolved filename")
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if (global.mxSkinner === undefined) {
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global.mxSkinner = new Skinner();
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}
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export default global.mxSkinner;
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