/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2008 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 ==
 *
 * FCKShowBlockCommand Class: the "Show Blocks" command.
 */

var FCKShowBlockCommand = function( name, defaultState )
{
    this.Name = name ;
    if ( defaultState != undefined )
        this._SavedState = defaultState ;
    else
        this._SavedState = null ;
}

FCKShowBlockCommand.prototype.Execute = function()
{
    var state = this.GetState() ;

    if ( state == FCK_TRISTATE_DISABLED )
        return ;

    var body = FCK.EditorDocument.body ;

    if ( state == FCK_TRISTATE_ON )
        body.className = body.className.replace( /(^| )FCK__ShowBlocks/g, '' ) ;
    else
        body.className += ' FCK__ShowBlocks' ;

    if ( FCKBrowserInfo.IsIE )
    {
        try
        {
            FCK.EditorDocument.selection.createRange().select() ;
        }
        catch ( e )
        {}
    }
    else
    {
        var focus = FCK.EditorWindow.getSelection().focusNode ;
        if ( focus.nodeType != 1 )
            focus = focus.parentNode ;
        FCKDomTools.ScrollIntoView( focus, false ) ;
    }

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

FCKShowBlockCommand.prototype.GetState = function()
{
    if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
        return FCK_TRISTATE_DISABLED ;

    // On some cases FCK.EditorDocument.body is not yet available
    if ( !FCK.EditorDocument )
        return FCK_TRISTATE_OFF ;

    if ( /FCK__ShowBlocks(?:\s|$)/.test( FCK.EditorDocument.body.className ) )
        return FCK_TRISTATE_ON ;

    return FCK_TRISTATE_OFF ;
}

FCKShowBlockCommand.prototype.SaveState = function()
{
    this._SavedState = this.GetState() ;
}

FCKShowBlockCommand.prototype.RestoreState = function()
{
    if ( this._SavedState != null && this.GetState() != this._SavedState )
        this.Execute() ;
}
