mediawiki-extensions-Visual.../modules/ve/ve.Element.js
Ed Sanders dcbea2328c Code style fix: @return -> @returns
Change-Id: I26daca6313bf09055af8f980ba0065782257fd54
2013-06-17 11:50:24 +01:00

187 lines
4 KiB
JavaScript

/*!
* VisualEditor UserInterface Element class.
*
* @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* Creates an ve.Element object.
*
* @class
* @abstract
*
* @constructor
* @param {Object} [config] Config options
* @cfg {Function} [$$] jQuery for the frame the widget is in
*/
ve.Element = function VeElement( config ) {
// Initialize config
config = config || {};
// Properties
this.$$ = config.$$ || ve.Element.static.get$$( document );
this.$ = this.$$( this.$$.context.createElement( this.getTagName() ) );
};
/* Static Properties */
/**
* @static
* @property
* @inheritable
*/
ve.Element.static = {};
/**
* HTML tag name.
*
* This may be ignored if getTagName is overridden.
*
* @static
* @property {string}
* @inheritable
*/
ve.Element.static.tagName = 'div';
/* Static Methods */
/**
* Gets a jQuery function within a specific document.
*
* @method
* @param {jQuery|HTMLElement|HTMLDocument|Window} context Context to bind the function to
* @param {ve.ui.Frame} [frame] Frame of the document context
* @returns {Function} Bound jQuery function
*/
ve.Element.static.get$$ = function ( context, frame ) {
function wrapper( selector ) {
return $( selector, wrapper.context );
}
wrapper.context = this.getDocument( context );
if ( frame ) {
wrapper.frame = frame;
}
return wrapper;
};
/**
* Get the document of an element.
*
* @method
* @param {jQuery|HTMLElement|HTMLDocument|Window} context Context to bind the function to
* @returns {HTMLDocument} Document object
* @throws {Error} If context is invalid
*/
ve.Element.static.getDocument = function ( context ) {
var doc =
// jQuery - selections created "offscreen" won't have a context, so .context isn't reliable
( context[0] && context[0].ownerDocument ) ||
// HTMLElement
context.ownerDocument ||
// Window
context.document ||
// HTMLDocument
( context.nodeType === 9 && context );
if ( doc ) {
return doc;
}
throw new Error( 'Invalid context' );
};
/**
* Get the window of an element or document.
*
* @method
* @param {jQuery|HTMLElement|HTMLDocument|Window} context Context to bind the function to
* @returns {Window} Window object
*/
ve.Element.static.getWindow = function ( context ) {
var doc = this.getDocument( context );
return doc.parentWindow || doc.defaultView;
};
/**
* Get the offset between two frames.
*
* TODO: Make this function not use recursion.
*
* @method
* @param {Window} from Window of the child frame
* @param {Window} [to=window] Window of the parent frame
* @param {Object} [offset] Offset to start with, used internally
* @returns {Object} Offset object, containing left and top properties
*/
ve.Element.static.getFrameOffset = function ( from, to, offset ) {
var i, len, frames, frame, rect;
if ( !to ) {
to = window;
}
if ( !offset ) {
offset = { 'top': 0, 'left': 0 };
}
if ( from.parent === from ) {
return offset;
}
// Get iframe element
frames = from.parent.document.getElementsByTagName( 'iframe' );
for ( i = 0, len = frames.length; i < len; i++) {
if ( frames[i].contentWindow === from ) {
frame = frames[i];
break;
}
}
// Recursively accumulate offset values
if ( frame ) {
rect = frame.getBoundingClientRect();
offset.left += rect.left;
offset.top += rect.top;
if ( from !== to ) {
this.getFrameOffset( from.parent, offset );
}
}
return offset;
};
/* Methods */
/**
* Get the HTML tag name.
*
* Override this method to base the result on instance information.
*
* @method
* @returns {string} HTML tag name
*/
ve.Element.prototype.getTagName = function () {
return this.constructor.static.tagName;
};
/**
* Get the DOM document.
*
* @method
* @returns {HTMLDocument} Document object
*/
ve.Element.prototype.getElementDocument = function () {
return ve.Element.static.getDocument( this.$ );
};
/**
* Get the DOM window.
*
* @method
* @returns {Window} Window object
*/
ve.Element.prototype.getElementWindow = function () {
return ve.Element.static.getWindow( this.$ );
};