Ticket #2255: fckplugin.js

/*
 * 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 ==
 *
 * Plugin: automatically resizes the editor until a configurable maximun
 * height (FCKConfig.AutoGrowMax), based on its contents.
 */

var FCKAutoGrow_Min = window.frameElement.offsetHeight ;

function FCKAutoGrow_Check()
{
        var oInnerDoc = FCK.EditorDocument ;

        var iFrameHeight, iInnerHeight ;

        if ( FCKBrowserInfo.IsIE )
        {
                iFrameHeight = FCK.EditorWindow.frameElement.offsetHeight ;
                iInnerHeight = oInnerDoc.body.scrollHeight ;
        }
        else
        {
                iFrameHeight = FCK.EditorWindow.innerHeight ;
                iInnerHeight = oInnerDoc.body.offsetHeight ;
        }

        var iDiff = iInnerHeight - iFrameHeight ;

        if ( iDiff != 0 )
        {
                var iMainFrameSize = window.frameElement.offsetHeight ;
                var FrameMax = FCKAutoGrow_GetFrameMax() ;

                if ( iDiff > 0 && iMainFrameSize < FrameMax )
                {
                        iMainFrameSize += iDiff ;
                        if ( iMainFrameSize > FrameMax )
                                iMainFrameSize = FrameMax ;
                }
                // resizing buggyness of the inner frame sometimes returns a possitive iDiff when it should be negative, handle it
                else if ( iDiff > 0 && iMainFrameSize > FrameMax ){
                        iMainFrameSize = FrameMax ;
                }
                else if ( iDiff < 0 && iMainFrameSize > FCKAutoGrow_Min )
                {
                        iMainFrameSize += iDiff ;
                        if ( iMainFrameSize < FCKAutoGrow_Min )
                                iMainFrameSize = FCKAutoGrow_Min ;
                        else if ( iMainFrameSize > FrameMax )
                                iMainFrameSize = FrameMax ;
                }
                else
                        return ;

                window.frameElement.height = iMainFrameSize ;

                // Gecko browsers use an onresize handler to update the innermost
                // IFRAME's height. If the document is modified before the onresize
                // is triggered, the plugin will miscalculate the new height. Thus,
                // forcibly trigger onresize. #1336
                if ( typeof window.onresize == 'function' )
                        window.onresize() ;
        }
}

function FCKAutoGrow_GetFrameMax(){
        if ( typeof( FCKConfig.AutoGrowMax ) == "number" ){
                return FCKConfig.AutoGrowMax;
        }else{
                return FCKTools.GetViewPaneSize( window.parent ).Height;
        }
}

FCK.AttachToOnSelectionChange( FCKAutoGrow_Check ) ;

function FCKAutoGrow_SetListeners()
{
        if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
                return ;

        FCK.EditorWindow.attachEvent( 'onscroll', FCKAutoGrow_Check ) ;
        FCK.EditorDocument.attachEvent( 'onkeyup', FCKAutoGrow_Check ) ;
}

if ( FCKBrowserInfo.IsIE )
{
//      FCKAutoGrow_SetListeners() ;
        FCK.Events.AttachEvent( 'OnAfterSetHTML', FCKAutoGrow_SetListeners ) ;
}

function FCKAutoGrow_CheckEditorStatus( sender, status )
{
        if ( status == FCK_STATUS_COMPLETE )
                FCKAutoGrow_Check() ;
}

FCK.Events.AttachEvent( 'OnStatusChange', FCKAutoGrow_CheckEditorStatus ) ;