mediawiki-extensions-Multim.../resources/mmv/ui/mmv.ui.js

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/*
* This file is part of the MediaWiki extension MultimediaViewer.
*
* MultimediaViewer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* MultimediaViewer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MultimediaViewer. If not, see <http://www.gnu.org/licenses/>.
*/
( function ( mw, $ ) {
var EP;
/**
* Represents a UI element.
* @class mw.mmv.ui.Element
* @abstract
* @constructor
* @param {jQuery} $container
*/
function Element( $container ) {
/** @property {jQuery} $container The element that contains the UI element. */
this.$container = $container;
/** @property {Object.<string, string[]>} eventsRegistered Events that this element has registered with the DOM. */
this.eventsRegistered = {};
/**
* @property {Object.<string, jQuery>} $inlineStyles a list of `<style>` elements in the head
* which we use to manipulate pseudo-classes and pseudo-elements.
*/
this.$inlineStyles = [];
}
EP = Element.prototype;
/**
* @abstract
* Sets the data for the element.
*/
EP.set = function () {};
/**
* @abstract
* Empties the element.
*/
EP.empty = function () {};
/**
* @abstract
* Registers listeners.
*/
EP.attach = function() {};
/**
* @abstract
* Clears listeners.
*/
EP.unattach = function() {
this.clearEvents();
};
/**
* Add event handler in a way that will be auto-cleared on lightbox close
* @param {string} name Name of event, like 'keydown'
* @param {Function} handler Callback for the event
*
* TODO: Unit tests
*/
EP.handleEvent = function ( name, handler ) {
if ( this.eventsRegistered[name] === undefined ) {
this.eventsRegistered[name] = [];
}
this.eventsRegistered[name].push( handler );
$( document ).on( name, handler );
};
/**
* Remove all events that have been registered on this element.
*
* TODO: Unit tests
*/
EP.clearEvents = function () {
var i, handlers, thisevent,
events = Object.keys( this.eventsRegistered );
for ( i = 0; i < events.length; i++ ) {
thisevent = events[i];
handlers = this.eventsRegistered[thisevent];
while ( handlers.length > 0 ) {
$( document ).off( thisevent, handlers.pop() );
}
}
};
/**
* Manipulate CSS directly. This is needed to set styles for pseudo-classes and pseudo-elements.
* @param {string} key some name to identify the style
* @param {string|null} style a CSS snippet (set to null to delete the given style)
*/
EP.setInlineStyle = function ( key, style ) {
if ( !this.$inlineStyles ) {
this.$inlineStyles = [];
}
if ( !this.$inlineStyles[key] ) {
if ( !style ) {
return;
}
this.$inlineStyles[key] = $( '<style type="text/css" />' ).appendTo( 'head' );
}
this.$inlineStyles[key].html( style || '' );
};
mw.mmv.ui = {};
mw.mmv.ui.reuse = {};
mw.mmv.ui.Element = Element;
}( mediaWiki, jQuery ) );