mediawiki-extensions-Visual.../modules/ve/ce/ve.ce.BranchNode.js
2012-10-03 15:40:44 -07:00

252 lines
7.6 KiB
JavaScript

/**
* VisualEditor content editable BranchNode class.
*
* @copyright 2011-2012 VisualEditor Team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* ContentEditable node that can have branch or leaf children.
*
* @class
* @abstract
* @constructor
* @extends {ve.ce.Node}
* @param {String} type Symbolic name of node type
* @param {ve.dm.BranchNode} model Model to observe
* @param {jQuery} [$element] Element to use as a container
*/
ve.ce.BranchNode = function VeCeBranchNode( type, model, $element ) {
// Mixin constructor
ve.BranchNode.call( this );
// Parent constructor
ve.ce.Node.call( this, type, model, $element );
// Properties
this.domWrapperElementType = this.$.get( 0 ).nodeName.toLowerCase();
this.slugs = { };
// Events
this.model.addListenerMethod( this, 'splice', 'onSplice' );
// DOM Changes
this.$.addClass( 've-ce-branchNode' );
// Initialization
this.onSplice.apply( this, [0, 0].concat( model.getChildren() ) );
};
/* Inheritance */
ve.inheritClass( ve.ce.BranchNode, ve.ce.Node );
ve.mixinClass( ve.ce.BranchNode, ve.BranchNode );
/* Static Members */
// TODO: Consider using different (or additional) CSS classes for inline and block aliens
if ( $.browser.msie ) {
ve.ce.BranchNode.$inlineSlugTemplate = $( '<span class="ve-ce-slug">&nbsp;</span>' );
} else {
ve.ce.BranchNode.$inlineSlugTemplate = $( '<span class="ve-ce-slug">&#xFEFF;</span>' );
}
ve.ce.BranchNode.$blockSlugTemplate =
ve.ce.BranchNode.$inlineSlugTemplate.clone().css( 'display', 'block' );
/* Static Methods */
/**
* Gets the appropriate element type for the DOM wrapper of a node.
*
* This method reads the {key} attribute from a {model} and looks up a type in the node's statically
* defined {domWrapperElementTypes} member, which is a mapping of possible values of that attribute
* and DOM element types.
*
* @method
* @param {ve.dm.BranchNode} model Model node is based on
* @param {String} key Attribute name to read type value from
* @returns {String} DOM element type for wrapper
* @throws 'Undefined attribute' if attribute is not defined in the model
* @throws 'Invalid attribute value' if attribute value is not a key in {domWrapperElementTypes}
*/
ve.ce.BranchNode.getDomWrapperType = function ( model, key ) {
var types,
value = model.getAttribute( key );
if ( value === undefined ) {
throw new Error( 'Undefined attribute: ' + key );
}
types = ve.ce.nodeFactory.lookup( model.getType() ).domWrapperElementTypes;
if ( types[value] === undefined ) {
throw new Error( 'Invalid attribute value: ' + value );
}
return types[value];
};
/**
* Gets a jQuery selection of a new DOM wrapper for a node.
*
* This method uses {getDomWrapperType} to determine the proper element type to use.
*
* @method
* @param {ve.dm.BranchNode} model Model node is based on
* @param {String} key Attribute name to read type value from
* @returns {jQuery} Selection of DOM wrapper
*/
ve.ce.BranchNode.getDomWrapper = function ( model, key ) {
var type = ve.ce.BranchNode.getDomWrapperType( model, key );
return $( document.createElement( type ) );
};
/* Methods */
/**
* Updates the DOM wrapper of this node if needed.
*
* This method uses {getDomWrapperType} to determine the proper element type to use.
*
* WARNING: The contents, .data( 'node' ) and any classes the wrapper already has will be moved to
* the new wrapper, but other attributes and any other information added using $.data() will be
* lost upon updating the wrapper. To retain information added to the wrapper, subscribe to the
* 'rewrap' event and copy information from the {$old} wrapper the {$new} wrapper.
*
* @method
* @param {String} key Attribute name to read type value from
* @emits rewrap ($old, $new)
*/
ve.ce.BranchNode.prototype.updateDomWrapper = function ( key ) {
var $element,
type = ve.ce.BranchNode.getDomWrapperType( this.model, key );
if ( type !== this.domWrapperElementType ) {
$element = $( document.createElement( type ) );
// Copy classes
$element.attr( 'class', this.$.attr( 'class' ) );
// Copy .data( 'node' )
$element.data( 'node', this.$.data( 'node' ) );
// Move contents
$element.append( this.$.contents() );
// Emit an event that can be handled to copy other things over if needed
this.emit( 'rewrap', this.$, $element );
// Swap elements
this.$.replaceWith( $element );
// Use new element from now on
this.$ = $element;
// Remember which type we are using now
this.domWrapperElementType = type;
}
};
/**
* Responds to splice events on a ve.dm.BranchNode.
*
* ve.ce.Node objects are generated from the inserted ve.dm.Node objects, producing a view that's a
* mirror of its model.
*
* @method
* @param {Number} index Index to remove and or insert nodes at
* @param {Number} howmany Number of nodes to remove
* @param {ve.dm.BranchNode} [...] Variadic list of nodes to insert
*/
ve.ce.BranchNode.prototype.onSplice = function ( index ) {
var i,
length,
args = Array.prototype.slice.call( arguments ),
$anchor,
removals;
// Convert models to views and attach them to this node
if ( args.length >= 3 ) {
for ( i = 2, length = args.length; i < length; i++ ) {
args[i] = ve.ce.nodeFactory.create( args[i].getType(), args[i] );
}
}
removals = this.children.splice.apply( this.children, args );
for ( i = 0, length = removals.length; i < length; i++ ) {
removals[i].detach();
// Update DOM
removals[i].$.detach();
}
if ( args.length >= 3 ) {
if ( index ) {
// Get the element before the insertion point
$anchor = this.children[ index - 1 ].$.last();
}
for ( i = args.length - 1; i >= 2; i-- ) {
args[i].attach( this );
if ( index ) {
$anchor.after( args[i].$ );
} else {
this.$.prepend( args[i].$ );
}
}
}
this.setupSlugs();
};
ve.ce.BranchNode.prototype.setupSlugs = function () {
var key, $slug, i;
// Remove all slugs in this branch
for( key in this.slugs ) {
this.slugs[key].remove();
}
if ( this.canHaveGrandchildren() ) {
$slug = ve.ce.BranchNode.$blockSlugTemplate.clone();
} else {
$slug = ve.ce.BranchNode.$inlineSlugTemplate.clone();
}
if ( this.getLength() === 0 ) {
this.slugs[0] = $slug.clone().appendTo( this.$ )
} else {
// Iterate over all children of this branch and add slugs in appropriate places
for ( i = 0; i < this.children.length; i++ ) {
// First sluggable child (left side)
if ( i === 0 && this.children[i].canHaveSlugBefore() ) {
this.slugs[i] = $slug.clone().insertBefore( this.children[i].$ );
}
if ( this.children[i].canHaveSlugAfter() ) {
if (
// Last sluggable child (right side)
i === this.children.length - 1 ||
// Sluggable child followed by another sluggable child (in between)
( this.children[i + 1] && this.children[i + 1].canHaveSlugBefore() )
) {
this.slugs[i + 1] = $slug.clone().insertAfter( this.children[i].$ );
}
}
}
}
};
ve.ce.BranchNode.prototype.getSlugAtOffset = function( offset ) {
var startOffset = this.model.getOffset() + ( this.isWrapped() ? 1 : 0 );
if ( offset === startOffset ) {
return this.slugs[0] || null;
}
for ( i = 0; i < this.children.length; i++ ) {
startOffset += this.children[i].model.getOuterLength();
if ( offset === startOffset ) {
return this.slugs[i + 1] || null;
}
}
};
ve.ce.BranchNode.prototype.clean = function () {
// Detach all child nodes from this.$
// We can't use this.$.empty() because that destroys .data() and event handlers
this.$.contents().each( function () {
$(this).detach();
} );
// Reattach the child nodes we're supposed to have
for ( var i = 0; i < this.children.length; i++ ) {
this.$.append( this.children[i].$ );
}
this.setupSlugs();
};