/*!
* VisualEditor UserInterface Frame class.
*
* @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* UserInterface iframe abstraction.
*
* @class
* @extends ve.Element
* @mixins ve.EventEmitter
*
* @constructor
* @param {Object} [config] Config options
*/
ve.ui.Frame = function VeUiFrame( config ) {
// Parent constructor
ve.Element.call( this, config );
// Mixin constructors
ve.EventEmitter.call( this );
// Properties
this.initialized = false;
this.config = config;
// Initialize
this.$
.addClass( 've-ui-frame' )
.attr( { 'frameborder': 0, 'scrolling': 'no' } );
};
/* Inheritance */
ve.inheritClass( ve.ui.Frame, ve.Element );
ve.mixinClass( ve.ui.Frame, ve.EventEmitter );
/* Static Properties */
ve.ui.Frame.static.tagName = 'iframe';
/* Events */
/**
* @event initialize
*/
/* Methods */
/**
* Load the frame contents.
*
* Once the iframe's stylesheets are loaded, the `initialize` event will be emitted.
*
* Sounds simple right? Read on...
*
* When you create a dynamic iframe using open/write/close, the window.load event for the
* iframe is triggered when you call close, and there's no further load event to indicate that
* everything is actually loaded.
*
* By dynamically adding stylesheet links, we can detect when each link is loaded by testing if we
* have access to each of their `sheet.cssRules` properties. Every 10ms we poll to see if we have
* access to the style's `sheet.cssRules` property yet.
*
* However, because of security issues, we never have such access if the stylesheet came from a
* different site. Thus, we are left with linking to the stylesheets through a style element with
* multiple `@import` statements - which ends up being simpler anyway. Since we created that style,
* we always have access, and its contents are only available when everything is done loading.
*
* @emits initialize
*/
ve.ui.Frame.prototype.load = function () {
var win = this.$.prop( 'contentWindow' ),
doc = win.document;
// Figure out directionality:
this.dir = this.$.closest( '[dir]' ).prop( 'dir' ) || 'ltr';
// Initialize contents
doc.open();
doc.write(
'' +
'' +
'' +
'' +
'' +
''
);
doc.close();
// Properties
this.$$ = ve.Element.get$$( doc, this );
this.$content = this.$$( '.ve-ui-frame-content' );
this.$document = this.$$( doc );
this.transplantStyles();
this.initialized = true;
this.emit( 'initialize' );
};
/**
* Transplant the CSS styles from the frame's parent document to the frame's document.
*
* This loops over the style sheets in the parent document, and copies their tags to the
* frame's document. `` tags pointing to same-origin style sheets are inlined as `