define([
	"dojo/_base/declare", // declare
	"dojo/dom", // dom.setSelectable
	"dojo/has",
	"../registry"        // registry.byNode
], function(declare, dom, has, registry){

	// module:
	//		dijit/form/_ButtonMixin

	var ButtonMixin = declare("dijit.form._ButtonMixin" + (has("dojo-bidi") ? "_NoBidi" : ""), null, {
		// summary:
		//		A mixin to add a thin standard API wrapper to a normal HTML button
		// description:
		//		A label should always be specified (through innerHTML) or the label attribute.
		//
		//		Attach points:
		//
		//		- focusNode (required): this node receives focus
		//		- valueNode (optional): this node's value gets submitted with FORM elements
		//		- containerNode (optional): this node gets the innerHTML assignment for label
		// example:
		// |	<button data-dojo-type="dijit/form/Button" onClick="...">Hello world</button>
		// example:
		// |	var button1 = new Button({label: "hello world", onClick: foo});
		// |	dojo.body().appendChild(button1.domNode);

		// label: HTML String
		//		Content to display in button.
		label: "",

		// type: [const] String
		//		Type of button (submit, reset, button, checkbox, radio)
		type: "button",

		__onClick: function(/*Event*/ e){
			// summary:
			//		Internal function to divert the real click onto the hidden INPUT that has a native default action associated with it
			// type:
			//		private
			e.stopPropagation();
			e.preventDefault();
			if(!this.disabled){
				// cannot use on.emit since button default actions won't occur
				this.valueNode.click(e);
			}
			return false;
		},

		_onClick: function(/*Event*/ e){
			// summary:
			//		Internal function to handle click actions
			if(this.disabled){
				e.stopPropagation();
				e.preventDefault();
				return false;
			}
			if(this.onClick(e) === false){
				e.preventDefault();
			}
			var cancelled = e.defaultPrevented;

			// Signal Form/Dialog to submit/close.  For 2.0, consider removing this code and instead making the Form/Dialog
			// listen for bubbled click events where evt.target.type == "submit" && !evt.defaultPrevented.
			if(!cancelled && this.type == "submit" && !(this.valueNode || this.focusNode).form){
				for(var node = this.domNode; node.parentNode; node = node.parentNode){
					var widget = registry.byNode(node);
					if(widget && typeof widget._onSubmit == "function"){
						widget._onSubmit(e);
						e.preventDefault(); // action has already occurred
						cancelled = true;
						break;
					}
				}
			}

			return !cancelled;
		},

		postCreate: function(){
			this.inherited(arguments);
			dom.setSelectable(this.focusNode, false);
		},

		onClick: function(/*Event*/ /*===== e =====*/){
			// summary:
			//		Callback for when button is clicked.
			//		If type="submit", return true to perform submit, or false to cancel it.
			// type:
			//		callback
			return true;		// Boolean
		},

		_setLabelAttr: function(/*String*/ content){
			// summary:
			//		Hook for set('label', ...) to work.
			// description:
			//		Set the label (text) of the button; takes an HTML string.
			this._set("label", content);
			var labelNode = this.containerNode || this.focusNode;
			labelNode.innerHTML = content;
		}
	});

	if(has("dojo-bidi")){
		ButtonMixin = declare("dijit.form._ButtonMixin", ButtonMixin, {
			_setLabelAttr: function(){
				this.inherited(arguments);
				var labelNode = this.containerNode || this.focusNode;
				this.applyTextDir(labelNode);
			}
		});
	}

	return ButtonMixin;
});
