openNG/lib/jquery/draggable.js

'use strict';

var debounce = require("debounce");
var defaultValue = require("default-value");

var selectable = require("./selectable");

module.exports = function ($) {
	selectable($);

	$.fn.draggable = function () {
		var _this = this;

		var options = arguments.length <= 0 || arguments[0] === undefined ? {} : arguments[0];

		var debounceInterval = defaultValue(options.debounce, 10);

		this.on("mousedown", function (event) {
			var startX = event.pageX;
			var startY = event.pageY;

			var moveHandler = debounce(function (event) {
				_this.trigger("draggable:move", [{
					offsetX: event.pageX - startX,
					offsetY: event.pageY - startY
				}]);
			}, debounceInterval);

			$(document).on("mousemove", moveHandler);

			$(document).one("mouseup", function (event) {
				$(document).off("mousemove", moveHandler);
				$(document).enableSelection();

				_this.trigger("draggable:end");
			});

			$(document).disableSelection();

			_this.trigger("draggable:start");
		});
	};
};