dojo.provide("dijit._base.typematic");

dijit.typematic = {
	// summary:
	//		These functions are used to repetitively call a user specified callback
	//		method when a specific key or mouse click over a specific DOM node is
	//		held down for a specific amount of time.
	//		Only 1 such event is allowed to occur on the browser page at 1 time.

	_fireEventAndReload: function(){
		this._timer = null;
		this._callback(++this._count, this._node, this._evt);
		
		// Schedule next event, reducing the timer a little bit each iteration, bottoming-out at 10 to avoid
		// browser overload (particularly avoiding starving DOH robot so it never gets to send a mouseup)
		this._currentTimeout = Math.max(
			this._currentTimeout < 0 ? this._initialDelay :
				(this._subsequentDelay > 1 ? this._subsequentDelay : Math.round(this._currentTimeout * this._subsequentDelay)),
			10);
		this._timer = setTimeout(dojo.hitch(this, "_fireEventAndReload"), this._currentTimeout);
	},

	trigger: function(/*Event*/ evt, /* Object */ _this, /*DOMNode*/ node, /* Function */ callback, /* Object */ obj, /* Number */ subsequentDelay, /* Number */ initialDelay){
		// summary:
		//		Start a timed, repeating callback sequence.
		//		If already started, the function call is ignored.
		//		This method is not normally called by the user but can be
		//		when the normal listener code is insufficient.
		// evt:
		//		key or mouse event object to pass to the user callback
		// _this:
		//		pointer to the user's widget space.
		// node:
		//		the DOM node object to pass the the callback function
		// callback:
		//		function to call until the sequence is stopped called with 3 parameters:
		// count:
		//		integer representing number of repeated calls (0..n) with -1 indicating the iteration has stopped
		// node:
		//		the DOM node object passed in
		// evt:
		//		key or mouse event object
		// obj:
		//		user space object used to uniquely identify each typematic sequence
		// subsequentDelay:
		//		if > 1, the number of milliseconds until the 3->n events occur
		//		or else the fractional time multiplier for the next event's delay, default=0.9
		// initialDelay:
		//		the number of milliseconds until the 2nd event occurs, default=500ms
		if(obj != this._obj){
			this.stop();
			this._initialDelay = initialDelay || 500;
			this._subsequentDelay = subsequentDelay || 0.90;
			this._obj = obj;
			this._evt = evt;
			this._node = node;
			this._currentTimeout = -1;
			this._count = -1;
			this._callback = dojo.hitch(_this, callback);
			this._fireEventAndReload();
		}
	},

	stop: function(){
		// summary:
		//		Stop an ongoing timed, repeating callback sequence.
		if(this._timer){
			clearTimeout(this._timer);
			this._timer = null;
		}
		if(this._obj){
			this._callback(-1, this._node, this._evt);
			this._obj = null;
		}
	},

	addKeyListener: function(/*DOMNode*/ node, /*Object*/ keyObject, /*Object*/ _this, /*Function*/ callback, /*Number*/ subsequentDelay, /*Number*/ initialDelay){
		// summary:
		//		Start listening for a specific typematic key.
		//		See also the trigger method for other parameters.
		// keyObject:
		//		an object defining the key to listen for.
		// charOrCode:
		//		the printable character (string) or keyCode (number) to listen for.
		// keyCode:
		//		(deprecated - use charOrCode) the keyCode (number) to listen for (implies charCode = 0).
		// charCode:
		//		(deprecated - use charOrCode) the charCode (number) to listen for.
		// ctrlKey:
		//		desired ctrl key state to initiate the calback sequence:
		//			- pressed (true)
		//			- released (false)
		//			- either (unspecified)
		// altKey:
		//		same as ctrlKey but for the alt key
		// shiftKey:
		//		same as ctrlKey but for the shift key
		// returns:
		//		an array of dojo.connect handles
		if(keyObject.keyCode){
			keyObject.charOrCode = keyObject.keyCode;
			dojo.deprecated("keyCode attribute parameter for dijit.typematic.addKeyListener is deprecated. Use charOrCode instead.", "", "2.0");
		}else if(keyObject.charCode){
			keyObject.charOrCode = String.fromCharCode(keyObject.charCode);
			dojo.deprecated("charCode attribute parameter for dijit.typematic.addKeyListener is deprecated. Use charOrCode instead.", "", "2.0");
		}
		return [
			dojo.connect(node, "onkeypress", this, function(evt){
				if(evt.charOrCode == keyObject.charOrCode &&
				(keyObject.ctrlKey === undefined || keyObject.ctrlKey == evt.ctrlKey) &&
				(keyObject.altKey === undefined || keyObject.altKey == evt.altKey) &&
				(keyObject.metaKey === undefined || keyObject.metaKey == (evt.metaKey || false)) && // IE doesn't even set metaKey
				(keyObject.shiftKey === undefined || keyObject.shiftKey == evt.shiftKey)){
					dojo.stopEvent(evt);
					dijit.typematic.trigger(keyObject, _this, node, callback, keyObject, subsequentDelay, initialDelay);
				}else if(dijit.typematic._obj == keyObject){
					dijit.typematic.stop();
				}
			}),
			dojo.connect(node, "onkeyup", this, function(evt){
				if(dijit.typematic._obj == keyObject){
					dijit.typematic.stop();
				}
			})
		];
	},

	addMouseListener: function(/*DOMNode*/ node, /*Object*/ _this, /*Function*/ callback, /*Number*/ subsequentDelay, /*Number*/ initialDelay){
		// summary:
		//		Start listening for a typematic mouse click.
		//		See the trigger method for other parameters.
		// returns:
		//		an array of dojo.connect handles
		var dc = dojo.connect;
		return [
			dc(node, "mousedown", this, function(evt){
				dojo.stopEvent(evt);
				dijit.typematic.trigger(evt, _this, node, callback, node, subsequentDelay, initialDelay);
			}),
			dc(node, "mouseup", this, function(evt){
				dojo.stopEvent(evt);
				dijit.typematic.stop();
			}),
			dc(node, "mouseout", this, function(evt){
				dojo.stopEvent(evt);
				dijit.typematic.stop();
			}),
			dc(node, "mousemove", this, function(evt){
				dojo.stopEvent(evt);
			}),
			dc(node, "dblclick", this, function(evt){
				dojo.stopEvent(evt);
				if(dojo.isIE){
					dijit.typematic.trigger(evt, _this, node, callback, node, subsequentDelay, initialDelay);
					setTimeout(dojo.hitch(this, dijit.typematic.stop), 50);
				}
			})
		];
	},

	addListener: function(/*Node*/ mouseNode, /*Node*/ keyNode, /*Object*/ keyObject, /*Object*/ _this, /*Function*/ callback, /*Number*/ subsequentDelay, /*Number*/ initialDelay){
		// summary:
		//		Start listening for a specific typematic key and mouseclick.
		//		This is a thin wrapper to addKeyListener and addMouseListener.
		//		See the addMouseListener and addKeyListener methods for other parameters.
		// mouseNode:
		//		the DOM node object to listen on for mouse events.
		// keyNode:
		//		the DOM node object to listen on for key events.
		// returns:
		//		an array of dojo.connect handles
		return this.addKeyListener(keyNode, keyObject, _this, callback, subsequentDelay, initialDelay).concat(
			this.addMouseListener(mouseNode, _this, callback, subsequentDelay, initialDelay));
	}
};
