define("dijit/_editor/plugins/ToggleDir", [
	"dojo/_base/declare", // declare
	"dojo/dom-style", // domStyle.getComputedStyle
	"dojo/_base/kernel", // kernel.experimental
	"dojo/_base/lang", // lang.hitch
	"dojo/on",
	"../_Plugin",
	"../../form/ToggleButton"
], function(declare, domStyle, kernel, lang, on, _Plugin, ToggleButton){

	// module:
	//		dijit/_editor/plugins/ToggleDir

	kernel.experimental("dijit._editor.plugins.ToggleDir");

	var ToggleDir = declare("dijit._editor.plugins.ToggleDir", _Plugin, {
		// summary:
		//		This plugin is used to toggle direction of the edited document,
		//		independent of what direction the whole page is.

		// Override _Plugin.useDefaultCommand: processing is done in this plugin
		// rather than by sending commands to the Editor
		useDefaultCommand: false,

		command: "toggleDir",

		// Override _Plugin.buttonClass to use a ToggleButton for this plugin rather than a vanilla Button
		buttonClass: ToggleButton,

		_initButton: function(){
			// Override _Plugin._initButton() to setup handler for button click events.
			this.inherited(arguments);
			this.editor.onLoadDeferred.then(lang.hitch(this, function(){
				var editDoc = this.editor.editorObject.contentWindow.document.documentElement;
				//IE direction has to toggle on the body, not document itself.
				//If you toggle just the document, things get very strange in the
				//view.  But, the nice thing is this works for all supported browsers.
				editDoc = editDoc.getElementsByTagName("body")[0];
				var isLtr = domStyle.getComputedStyle(editDoc).direction == "ltr";
				this.button.set("checked", !isLtr);
				this.own(this.button.on("change", lang.hitch(this, "_setRtl")));
			}));
		},

		updateState: function(){
			// summary:
			//		Over-ride for button state control for disabled to work.
			this.button.set("disabled", this.get("disabled"));
		},

		_setRtl: function(rtl){
			// summary:
			//		Handler for button click events, to switch the text direction of the editor
			var dir = "ltr";
			if(rtl){
				dir = "rtl";
			}
			var editDoc = this.editor.editorObject.contentWindow.document.documentElement;
			editDoc = editDoc.getElementsByTagName("body")[0];
			editDoc.dir/*html node*/ = dir;
		}
	});

	// Register this plugin.
	_Plugin.registry["toggleDir"] = function(){
		return new ToggleDir({command: "toggleDir"});
	};

	return ToggleDir;
});
