?/*
 * 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 ==
 *
 * Creation and initialization of the "FCK" object. This is the main
 * object that represents an editor instance.
 * (Gecko specific implementations)
 */

FCK.Description = "FCKeditor for Gecko Browsers" ;

FCK.InitializeBehaviors = function()
{
	// When calling "SetData", the editing area IFRAME gets a fixed height. So we must recalculate it.
	if ( window.onresize )		// Not for Safari/Opera.
		window.onresize() ;

	FCKFocusManager.AddWindow( this.EditorWindow ) ;

	this.ExecOnSelectionChange = function()
	{
		FCK.Events.FireEvent( "OnSelectionChange" ) ;
	}

	this._ExecDrop = function( evt )
	{
		if ( FCK.MouseDownFlag )
		{
			FCK.MouseDownFlag = false ;
			return ;
		}

		if ( FCKConfig.ForcePasteAsPlainText )
		{
			if ( evt.dataTransfer )
			{
				var text = evt.dataTransfer.getData( 'Text' ) ;
				text = FCKTools.HTMLEncode( text ) ;
				text = FCKTools.ProcessLineBreaks( window, FCKConfig, text ) ;
				FCK.InsertHtml( text ) ;
			}
			else if ( FCKConfig.ShowDropDialog )
				FCK.PasteAsPlainText() ;

			evt.preventDefault() ;
			evt.stopPropagation() ;
		}
	}

	this._ExecCheckCaret = function( evt )
	{
		if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
			return ;

		if ( evt.type == 'keypress' )
		{
			var keyCode = evt.keyCode ;
			// ignore if positioning key is not pressed.
			// left or up arrow keys need to be processed as well, since <a> links can be expanded in Gecko's editor
			// when the caret moved left or up from another block element below.
			if ( keyCode < 33 || keyCode > 40 )
				return ;
		}

		var blockEmptyStop = function( node )
		{
			if ( node.nodeType != 1 )
				return false ;
			var tag = node.tagName.toLowerCase() ;
			return ( FCKListsLib.BlockElements[tag] || FCKListsLib.EmptyElements[tag] ) ;
		}

		var moveCursor = function()
		{
			var selection = FCKSelection.GetSelection() ;
			var range = selection.getRangeAt(0) ;
			if ( ! range || ! range.collapsed )
				return ;

			var node = range.endContainer ;

			// only perform the patched behavior if we're at the end of a text node.
			if ( node.nodeType != 3 )
				return ;

			if ( node.nodeValue.length != range.endOffset )
				return ;

			// only perform the patched behavior if we're in an <a> tag, or the End key is pressed.
			var parentTag = node.parentNode.tagName.toLowerCase() ;
			if ( ! (  parentTag == 'a' || ( !FCKBrowserInfo.IsOpera && String(node.parentNode.contentEditable) == 'false' ) ||
					( ! ( FCKListsLib.BlockElements[parentTag] || FCKListsLib.NonEmptyBlockElements[parentTag] )
					  && keyCode == 35 ) ) )
				return ;

			// our caret has moved to just after the last character of a text node under an unknown tag, how to proceed?
			// first, see if there are other text nodes by DFS walking from this text node.
			// 	- if the DFS has scanned all nodes under my parent, then go the next step.
			//	- if there is a text node after me but still under my parent, then do nothing and return.
			var nextTextNode = FCKTools.GetNextTextNode( node, node.parentNode, blockEmptyStop ) ;
			if ( nextTextNode )
				return ;

			// we're pretty sure we need to move the caret forcefully from here.
			range = FCK.EditorDocument.createRange() ;

			nextTextNode = FCKTools.GetNextTextNode( node, node.parentNode.parentNode, blockEmptyStop ) ;
			if ( nextTextNode )
			{
				// Opera thinks the dummy empty text node we append beyond the end of <a> nodes occupies a caret
				// position. So if the user presses the left key and we reset the caret position here, the user
				// wouldn't be able to go back.
				if ( FCKBrowserInfo.IsOpera && keyCode == 37 )
					return ;

				// now we want to get out of our current parent node, adopt the next parent, and move the caret to
				// the appropriate text node under our new parent.
				// our new parent might be our current parent's siblings if we are lucky.
				range.setStart( nextTextNode, 0 ) ;
				range.setEnd( nextTextNode, 0 ) ;
			}
			else
			{
				// no suitable next siblings under our grandparent! what to do next?
				while ( node.parentNode
					&& node.parentNode != FCK.EditorDocument.body
					&& node.parentNode != FCK.EditorDocument.documentElement
					&& node == node.parentNode.lastChild
					&& ( ! FCKListsLib.BlockElements[node.parentNode.tagName.toLowerCase()]
					  && ! FCKListsLib.NonEmptyBlockElements[node.parentNode.tagName.toLowerCase()] ) )
					node = node.parentNode ;


				if ( FCKListsLib.BlockElements[ parentTag ]
						|| FCKListsLib.EmptyElements[ parentTag ]
						|| node == FCK.EditorDocument.body )
				{
					// if our parent is a block node, move to the end of our parent.
					range.setStart( node, node.childNodes.length ) ;
					range.setEnd( node, node.childNodes.length ) ;
				}
				else
				{
					// things are a little bit more interesting if our parent is not a block node
					// due to the weired ways how Gecko's caret acts...
					var stopNode = node.nextSibling ;

					// find out the next block/empty element at our grandparent, we'll
					// move the caret just before it.
					while ( stopNode )
					{
						if ( stopNode.nodeType != 1 )
						{
							stopNode = stopNode.nextSibling ;
							continue ;
						}

						var stopTag = stopNode.tagName.toLowerCase() ;
						if ( FCKListsLib.BlockElements[stopTag] || FCKListsLib.EmptyElements[stopTag]
							|| FCKListsLib.NonEmptyBlockElements[stopTag] )
							break ;
						stopNode = stopNode.nextSibling ;
					}

					// note that the dummy marker below is NEEDED, otherwise the caret's behavior will
					// be broken in Gecko.
					var marker = FCK.EditorDocument.createTextNode( '' ) ;
					if ( stopNode )
						node.parentNode.insertBefore( marker, stopNode ) ;
					else
						node.parentNode.appendChild( marker ) ;
					range.setStart( marker, 0 ) ;
					range.setEnd( marker, 0 ) ;
				}
			}

			selection.removeAllRanges() ;
			selection.addRange( range ) ;
			FCK.Events.FireEvent( "OnSelectionChange" ) ;
		}

		setTimeout( moveCursor, 1 ) ;
	}

	this.ExecOnSelectionChangeTimer = function()
	{
		if ( FCK.LastOnChangeTimer )
			window.clearTimeout( FCK.LastOnChangeTimer ) ;

		FCK.LastOnChangeTimer = window.setTimeout( FCK.ExecOnSelectionChange, 100 ) ;
	}

	this.EditorDocument.addEventListener( 'mouseup', this.ExecOnSelectionChange, false ) ;

	// On Gecko, firing the "OnSelectionChange" event on every key press started to be too much
	// slow. So, a timer has been implemented to solve performance issues when typing to quickly.
	this.EditorDocument.addEventListener( 'keyup', this.ExecOnSelectionChangeTimer, false ) ;

	this._DblClickListener = function( e )
	{
		FCK.OnDoubleClick( e.target ) ;
		e.stopPropagation() ;
	}
	this.EditorDocument.addEventListener( 'dblclick', this._DblClickListener, true ) ;

	// Record changes for the undo system when there are key down events.
	this.EditorDocument.addEventListener( 'keydown', this._KeyDownListener, false ) ;

	// Hooks for data object drops
	if ( FCKBrowserInfo.IsGecko )
	{
		this.EditorWindow.addEventListener( 'dragdrop', this._ExecDrop, true ) ;
	}
	else if ( FCKBrowserInfo.IsSafari )
	{
		var cancelHandler = function( evt ){ if ( ! FCK.MouseDownFlag ) evt.returnValue = false ; }
		this.EditorDocument.addEventListener( 'dragenter', cancelHandler, true ) ;
		this.EditorDocument.addEventListener( 'dragover', cancelHandler, true ) ;
		this.EditorDocument.addEventListener( 'drop', this._ExecDrop, true ) ;
		this.EditorDocument.addEventListener( 'mousedown',
			function( ev )
			{
				var element = ev.srcElement ;

				if ( element.nodeName.IEquals( 'IMG', 'HR', 'INPUT', 'TEXTAREA', 'SELECT' ) )
				{
					FCKSelection.SelectNode( element ) ;
				}
			}, true ) ;

		this.EditorDocument.addEventListener( 'mouseup',