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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
interface ICSSPluginConfig {
disabled?: boolean;
}
/**
* Invoked by the loader at run-time
*/
export function load(name: string, req: AMDLoader.IRelativeRequire, load: AMDLoader.IPluginLoadCallback, config: AMDLoader.IConfigurationOptions): void {
config = config || {};
const cssConfig = <ICSSPluginConfig>(config['vs/css'] || {});
if (cssConfig.disabled) {
// the plugin is asked to not create any style sheets
load({});
return;
}
const cssUrl = req.toUrl(name + '.css');
loadCSS(name, cssUrl, () => {
load({});
}, (err: any) => {
if (typeof load.error === 'function') {
load.error('Could not find ' + cssUrl + '.');
}
});
}
function loadCSS(name: string, cssUrl: string, callback: () => void, errorback: (err: any) => void): void {
if (linkTagExists(name, cssUrl)) {
callback();
return;
}
createLinkTag(name, cssUrl, callback, errorback);
}
function linkTagExists(name: string, cssUrl: string): boolean {
const links = document.getElementsByTagName('link');
for (let i = 0, len = links.length; i < len; i++) {
const nameAttr = links[i].getAttribute('data-name');
const hrefAttr = links[i].getAttribute('href');
if (nameAttr === name || hrefAttr === cssUrl) {
return true;
}
}
return false;
}
function createLinkTag(name: string, cssUrl: string, callback: () => void, errorback: (err: any) => void): void {
const linkNode = document.createElement('link');
linkNode.setAttribute('rel', 'stylesheet');
linkNode.setAttribute('type', 'text/css');
linkNode.setAttribute('data-name', name);
attachListeners(name, linkNode, callback, errorback);
linkNode.setAttribute('href', cssUrl);
const head = document.head || document.getElementsByTagName('head')[0];
head.appendChild(linkNode);
}
function attachListeners(name: string, linkNode: HTMLLinkElement, callback: () => void, errorback: (err: any) => void): void {
const unbind = () => {
linkNode.removeEventListener('load', loadEventListener);
linkNode.removeEventListener('error', errorEventListener);
};
const loadEventListener = (e: any) => {
unbind();
callback();
};
const errorEventListener = (e: any) => {
unbind();
errorback(e);
};
linkNode.addEventListener('load', loadEventListener);
linkNode.addEventListener('error', errorEventListener);
}
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