source: branches/1.2/workflow/js/fckeditor/editor/_source/classes/fckdomrange_ie.js @ 1349

/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2007 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * Class for working with a selection range, much like the W3C DOM Range, but
 * it is not intented to be an implementation of the W3C interface.
 * (IE Implementation)
 */

FCKDomRange.prototype.MoveToSelection = function()
{
        this.Release( true ) ;

        this._Range = new FCKW3CRange( this.Window.document ) ;

        var oSel = this.Window.document.selection ;

        if ( oSel.type != 'Control' )
        {
                // Set the start boundary.
                eMarker = this._GetSelectionMarkerTag( true ) ;
                this._Range.setStart( eMarker.parentNode, FCKDomTools.GetIndexOf( eMarker ) ) ;
                eMarker.parentNode.removeChild( eMarker ) ;

                // Set the end boundary.
                var eMarker = this._GetSelectionMarkerTag( false ) ;
                this._Range.setEnd( eMarker.parentNode, FCKDomTools.GetIndexOf( eMarker ) ) ;
                eMarker.parentNode.removeChild( eMarker ) ;

                this._UpdateElementInfo() ;
        }
        else
        {
                var oControl = oSel.createRange().item(0) ;

                if ( oControl )
                {
                        this._Range.setStartBefore( oControl ) ;
                        this._Range.setEndAfter( oControl ) ;
                        this._UpdateElementInfo() ;
                }
        }
}

FCKDomRange.prototype.Select = function()
{
        if ( this._Range )
        {
                var bIsCollapsed = this.CheckIsCollapsed() ;

                // Create marker tags for the start and end boundaries.
                var eStartMarker        = this._GetRangeMarkerTag( true ) ;

                if ( !bIsCollapsed )
                        var eEndMarker  = this._GetRangeMarkerTag( false ) ;

                // Create the main range which will be used for the selection.
                var oIERange = this.Window.document.body.createTextRange() ;

                // Position the range at the start boundary.
                oIERange.moveToElementText( eStartMarker ) ;
                oIERange.moveStart( 'character', 1 ) ;

                if ( !bIsCollapsed )
                {
                        // Create a tool range for the end.
                        var oIERangeEnd = this.Window.document.body.createTextRange() ;

                        // Position the tool range at the end.
                        oIERangeEnd.moveToElementText( eEndMarker ) ;

                        // Move the end boundary of the main range to match the tool range.
                        oIERange.setEndPoint( 'EndToEnd', oIERangeEnd ) ;
                        oIERange.moveEnd( 'character', -1 ) ;
                }

                // Remove the markers (reset the position, because of the changes in the DOM tree).
                this._Range.setStartBefore( eStartMarker ) ;
                eStartMarker.parentNode.removeChild( eStartMarker ) ;

                if ( bIsCollapsed )
                {
                        // The following trick is needed so IE makes collapsed selections
                        // inside empty blocks visible (expands the block).
                        try
                        {
                                oIERange.pasteHTML(' ') ;
                                oIERange.moveStart( 'character', -1 ) ;
                        }
                        catch (e){}
                        oIERange.select() ;
                        oIERange.pasteHTML('') ;
                }
                else
                {
                        this._Range.setEndBefore( eEndMarker ) ;
                        eEndMarker.parentNode.removeChild( eEndMarker ) ;
                        oIERange.select() ;
                }
        }
}

FCKDomRange.prototype._GetSelectionMarkerTag = function( toStart )
{
        // Get a range for the start boundary.
        var oRange = this.Window.document.selection.createRange() ;
        oRange.collapse( toStart === true ) ;

        // Paste a marker element at the collapsed range and get it from the DOM.
        var sMarkerId = 'fck_dom_range_temp_' + (new Date()).valueOf() + '_' + Math.floor(Math.random()*1000) ;
        oRange.pasteHTML( '<span id="' + sMarkerId + '"></span>' ) ;
        return this.Window.document.getElementById( sMarkerId ) ;
}

FCKDomRange.prototype._GetRangeMarkerTag = function( toStart )
{
        // Get a range for the start boundary.
        var oRange = this._Range ;

        // insertNode() will add the node at the beginning of the Range, updating
        // the endOffset if necessary. So, we can work with the current range in this case.
        if ( !toStart )
        {
                oRange = oRange.cloneRange() ;
                oRange.collapse( toStart === true ) ;
        }

        var eSpan = this.Window.document.createElement( 'span' ) ;
        eSpan.innerHTML = '&nbsp;' ;
        oRange.insertNode( eSpan ) ;

        return eSpan ;
}