source: extensions/FCKEditor/editor/_source/commandclasses/fckjustifycommands.js @ 3295

/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2009 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 ==
 *
 * FCKJustifyCommand Class: controls block justification.
 */

var FCKJustifyCommand = function( alignValue )
{
        this.AlignValue = alignValue ;

        // Detect whether this is the instance for the default alignment.
        var contentDir = FCKConfig.ContentLangDirection.toLowerCase() ;
        this.IsDefaultAlign = ( alignValue == 'left' && contentDir == 'ltr' ) ||
                                                  ( alignValue == 'right' && contentDir == 'rtl' ) ;

        // Get the class name to be used by this instance.
        var cssClassName = this._CssClassName = ( function()
        {
                var classes = FCKConfig.JustifyClasses ;
                if ( classes )
                {
                        switch ( alignValue )
                        {
                                case 'left' :
                                        return classes[0] || null ;
                                case 'center' :
                                        return classes[1] || null ;
                                case 'right' :
                                        return classes[2] || null ;
                                case 'justify' :
                                        return classes[3] || null ;
                        }
                }
                return null ;
        } )() ;

        if ( cssClassName && cssClassName.length > 0 )
                this._CssClassRegex = new RegExp( '(?:^|\\s+)' + cssClassName + '(?=$|\\s)' ) ;
}

FCKJustifyCommand._GetClassNameRegex = function()
{
        var regex = FCKJustifyCommand._ClassRegex ;
        if ( regex != undefined )
                return regex ;

        var names = [] ;

        var classes = FCKConfig.JustifyClasses ;
        if ( classes )
        {
                for ( var i = 0 ; i < 4 ; i++ )
                {
                        var className = classes[i] ;
                        if ( className && className.length > 0 )
                                names.push( className ) ;
                }
        }

        if ( names.length > 0 )
                regex = new RegExp( '(?:^|\\s+)(?:' + names.join( '|' ) + ')(?=$|\\s)' ) ;
        else
                regex = null ;

        return FCKJustifyCommand._ClassRegex = regex ;
}

FCKJustifyCommand.prototype =
{
        Execute : function()
        {
                // Save an undo snapshot before doing anything.
                FCKUndo.SaveUndoStep() ;

                var range = new FCKDomRange( FCK.EditorWindow ) ;
                range.MoveToSelection() ;

                var currentState = this.GetState() ;
                if ( currentState == FCK_TRISTATE_DISABLED )
                        return ;

                // Store a bookmark of the selection since the paragraph iterator might
                // change the DOM tree and break selections.
                var bookmark = range.CreateBookmark() ;

                var cssClassName = this._CssClassName ;

                // Apply alignment setting for each paragraph.
                var iterator = new FCKDomRangeIterator( range ) ;
                var block ;
                while ( ( block = iterator.GetNextParagraph() ) )
                {
                        block.removeAttribute( 'align' ) ;

                        if ( cssClassName )
                        {
                                // Remove the any of the alignment classes from the className.
                                var className = block.className.replace( FCKJustifyCommand._GetClassNameRegex(), '' ) ;

                                // Append the desired class name.
                                if ( currentState == FCK_TRISTATE_OFF )
                                {
                                        if ( className.length > 0 )
                                                className += ' ' ;
                                        block.className = className + cssClassName ;
                                }
                                else if ( className.length == 0 )
                                        FCKDomTools.RemoveAttribute( block, 'class' ) ;
                        }
                        else
                        {
                                var style = block.style ;
                                if ( currentState == FCK_TRISTATE_OFF )
                                        style.textAlign = this.AlignValue ;
                                else
                                {
                                        style.textAlign = '' ;
                                        if ( style.cssText.length == 0 )
                                                block.removeAttribute( 'style' ) ;
                                }
                        }
                }

                // Restore previous selection.
                range.MoveToBookmark( bookmark ) ;
                range.Select() ;

                FCK.Focus() ;
                FCK.Events.FireEvent( 'OnSelectionChange' ) ;
        },

        GetState : function()
        {
                // Disabled if not WYSIWYG.
                if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG || ! FCK.EditorWindow )
                        return FCK_TRISTATE_DISABLED ;

                // Retrieve the first selected block.
                var path = new FCKElementPath( FCKSelection.GetBoundaryParentElement( true ) ) ;
                var firstBlock = path.Block || path.BlockLimit ;

                if ( !firstBlock || firstBlock.nodeName.toLowerCase() == 'body' )
                        return FCK_TRISTATE_OFF ;

                // Check if the desired style is already applied to the block.
                var currentAlign ;
                if ( FCKBrowserInfo.IsIE )
                        currentAlign = firstBlock.currentStyle.textAlign ;
                else
                        currentAlign = FCK.EditorWindow.getComputedStyle( firstBlock, '' ).getPropertyValue( 'text-align' );
                currentAlign = currentAlign.replace( /(-moz-|-webkit-|start|auto)/i, '' );
                if ( ( !currentAlign && this.IsDefaultAlign ) || currentAlign == this.AlignValue )
                        return FCK_TRISTATE_ON ;
                return FCK_TRISTATE_OFF ;
        }
} ;