ckeditor/_source/plugins/clipboard/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
*/

/**
 * @file Clipboard support
 */

(function()
{
	// Tries to execute any of the paste, cut or copy commands in IE. Returns a
	// boolean indicating that the operation succeeded.
	var execIECommand = function( editor, command )
	{
		var doc = editor.document,
			body = doc.getBody();

		var enabled = 0;
		var onExec = function()
		{
			enabled = 1;
		};

		// The following seems to be the only reliable way to detect that
		// clipboard commands are enabled in IE. It will fire the
		// onpaste/oncut/oncopy events only if the security settings allowed
		// the command to execute.
		body.on( command, onExec );

		// IE6/7: document.execCommand has problem to paste into positioned element.
		( CKEDITOR.env.version > 7 ? doc.$ : doc.$.selection.createRange() ) [ 'execCommand' ]( command );

		body.removeListener( command, onExec );

		return enabled;
	};

	// Attempts to execute the Cut and Copy operations.
	var tryToCutCopy =
		CKEDITOR.env.ie ?
			function( editor, type )
			{
				return execIECommand( editor, type );
			}
		:		// !IE.
			function( editor, type )
			{
				try
				{
					// Other browsers throw an error if the command is disabled.
					return editor.document.$.execCommand( type, false, null );
				}
				catch( e )
				{
					return false;
				}
			};

	// A class that represents one of the cut or copy commands.