Ticket #4606: plugin.js

(function() 
{
        function check( editor, wrapper ) 
        {
                var desiredHeight = getDesiredHeight(editor),
                        currentHeight = editor.window.getViewPaneSize().height,
                        newHeight = getEffectiveHeight( editor, desiredHeight );

                if ( newHeight != currentHeight )
                {
                        newHeight = editor.fire( 'beforeAutogrow' , {currentHeight : currentHeight, newHeight : newHeight} ).newHeight;
                        
                        wrapper.setStyle('height', newHeight + 'px');
                        editor.fire( 'afterAutogrow' );
                }
        }

        function getEffectiveHeight( editor, height ) 
        {
                var min = editor.config.autogrowMinHeight,
                        max = editor.config.autogrowMaxHeight;
                if ( min && min > height ) 
                        height = min;
                else if ( max && max < height ) 
                        height = max;
                return height;
        }

        function getDesiredHeight( editor ) 
        {
                var doc = editor.document.$,
                        size;

                if ( CKEDITOR.env.ie )
                        size = doc.documentElement.scrollHeight;
                else 
                        size = doc.documentElement.offsetHeight;
                return size;
        }

        CKEDITOR.plugins.add( 'autogrow', {
                
                init : function( editor ) 
                {
                        editor.on( 'mode', function( event )
                        {
                                event.removeListener();
                                var wrapper = CKEDITOR.document.getById('cke_contents_' + editor.name);
                                function listener () 
                                {
                                        check(editor, wrapper);
                                }

                                editor.on('contentDom', listener);
                                editor.on('key', listener);
                                editor.on('selectionChange', listener);
                                editor.on('insertElement', function() 
                                {
                                        setTimeout(listener, 1000);
                                });
                        });
                }
        });

        /**
         * Minimum height of an editor instance that uses the autogrow plugin
         * @type Number
         * @default 200
         * @example
         * config.autogrowMinHeight = 200;
         */
        CKEDITOR.config.autogrowMinHeight = 200;

        /**
         * Maximum height of an editor instance that uses the autogrow plugin
         * @type Number
         * @default 500
         * @example
         * config.autogrowMaxHeight = 500;
         */
        CKEDITOR.config.autogrowMaxHeight = 500;
})();