mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-09-27 04:06:51 +00:00
bb232a0ee7
Don't call initialize inside the try-catch, it ends up sending exceptions thrown inside that method to /dev/null. Change-Id: I8e0945f35c639ec156ee9a163b86fddfaed0ea7b
138 lines
3.5 KiB
JavaScript
138 lines
3.5 KiB
JavaScript
/*!
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* VisualEditor UserInterface Frame class.
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*
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* @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
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* @license The MIT License (MIT); see LICENSE.txt
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*/
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/**
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* UserInterface iframe abstraction.
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*
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* @class
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* @extends ve.EventEmitter
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*
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* @constructor
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* @param {Object} [config] Config options
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* @cfg {string[]} [stylesheets] List of stylesheet file names, each relative to ve/ui/styles
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*/
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ve.ui.Frame = function VeUiFrame( config ) {
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// Inheritance
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ve.EventEmitter.call( this );
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// Properties
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this.initialized = false;
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this.config = config;
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this.$ = $( '<iframe>' );
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// Events
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this.$.load( ve.bind( this.onLoad, this ) );
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// Initialize
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this.$
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.addClass( 've-ui-frame' )
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.attr( { 'frameborder': 0, 'scrolling': 'no' } );
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};
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/* Inheritance */
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ve.inheritClass( ve.ui.Frame, ve.EventEmitter );
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/* Events */
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/**
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* @event initialize
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*/
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/* Methods */
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/**
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* Handle frame load events.
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*
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* Once the iframe's stylesheets are loaded, the `initialize` event will be emitted.
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*
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* Sounds simple right? Read on...
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*
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* When you create a dynamic iframe using open/write/close, the window.load event for the
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* iframe is triggered when you call close, and there's no further load event to indicate that
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* everything is actually loaded.
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*
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* By dynamically adding stylesheet links, we can detect when each link is loaded by testing if we
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* have access to each of their `sheet.cssRules` properties. Every 10ms we poll to see if we have
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* access to the style's `sheet.cssRules` property yet.
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*
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* However, because of security issues, we never have such access if the stylesheet came from a
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* different site. Thus, we are left with linking to the stylesheets through a style element with
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* multiple `@import` statements - which ends up being simpler anyway. Since we created that style,
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* we always have access, and its contents are only available when everything is done loading.
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*
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* @emits initialize
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*/
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ve.ui.Frame.prototype.onLoad = function () {
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var interval, rules,
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win = this.$.prop( 'contentWindow' ),
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doc = win.document,
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style = doc.createElement( 'style' ),
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initialize = ve.bind( function () {
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this.initialized = true;
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this.emit( 'initialize' );
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}, this );
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// Initialize contents
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doc.open();
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doc.write(
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'<body style="padding:0;margin:0;">' +
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'<div class="ve-ui-frame-content"></div>' +
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'</body>'
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);
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doc.close();
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// Import all stylesheets
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style.textContent = '@import "' + this.config.stylesheets.join( '";\n@import "' ) + '";';
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doc.body.appendChild( style );
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// Poll for access to stylesheet content
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interval = setInterval( ve.bind( function () {
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try {
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// MAGIC: only accessible when the stylesheet is loaded
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rules = style.sheet.cssRules;
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} catch ( e ) {
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// Try again in 10ms
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return;
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}
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// If that didn't throw an exception, we're done loading
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clearInterval( interval );
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// Protect against IE running interval one extra time after clearing
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if ( !this.initialized ) {
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initialize();
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}
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}, this ), 10 );
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// Properties
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this.$$ = ve.ui.get$$( doc, this );
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this.$content = this.$$( '.ve-ui-frame-content' );
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};
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/**
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* @param {Function} callback
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*/
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ve.ui.Frame.prototype.run = function ( callback ) {
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if ( this.initialized ) {
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callback();
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} else {
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this.once( 'initialize', callback );
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}
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};
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/**
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* Sets the size of the frame.
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*
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* @method
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* @param {number} width Frame width in pixels
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* @param {number} height Frame height in pixels
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* @chainable
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*/
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ve.ui.Frame.prototype.setSize = function ( width, height ) {
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this.$.css( { 'width': width, 'height': height } );
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return this;
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};
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