ckeditor/_source/plugins/bidi/plugin.js

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/*
Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

(function()
{
	var guardElements = { table:1, ul:1, ol:1, blockquote:1, div:1 },
		directSelectionGuardElements = {},
		// All guard elements which can have a direction applied on them.
		allGuardElements = {};
	CKEDITOR.tools.extend( directSelectionGuardElements, guardElements, { tr:1, p:1, div:1, li:1 } );
	CKEDITOR.tools.extend( allGuardElements, directSelectionGuardElements, { td:1 } );

	function onSelectionChange( e )
	{
		setToolbarStates( e );
		handleMixedDirContent( e );
	}

	function setToolbarStates( evt )
	{
		var editor = evt.editor,
			path = evt.data.path;

		if ( editor.readOnly )
			return;

		var useComputedState = editor.config.useComputedState,
			selectedElement;

		useComputedState = useComputedState === undefined || useComputedState;

		// We can use computedState provided by the browser or traverse parents manually.
		if ( !useComputedState )
			selectedElement = getElementForDirection( path.lastElement );

		selectedElement = selectedElement || path.block || path.blockLimit;

		// If we're having BODY here, user probably done CTRL+A, let's try to get the enclosed node, if any.
		if ( selectedElement.is( 'body' ) )
		{
			var enclosedNode = editor.getSelection().getRanges()[ 0 ].getEnclosedNode();
			enclosedNode && enclosedNode.type == CKEDITOR.NODE_ELEMENT && ( selectedElement = enclosedNode );
		}

		if ( !selectedElement  )
			return;

		var selectionDir = useComputedState ?
			selectedElement.getComputedStyle( 'direction' ) :
			selectedElement.getStyle( 'direction' ) || selectedElement.getAttribute( 'dir' );

		editor.getCommand( 'bidirtl' ).setState( selectionDir == 'rtl' ? CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF );
		editor.getCommand( 'bidiltr' ).setState( selectionDir == 'ltr' ? CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF );
	}

	function handleMixedDirContent( evt )
	{
		var editor = evt.editor,