drag : function()

in optaplanner-docs/src/modules/ROOT/images/website/jstree/jstree.js [7126:7226]

• 77 lines of code
• 39 McCabe index (conditional complexity)

			drag : function (e) {
				if(e.type === "touchmove" && e.originalEvent && e.originalEvent.changedTouches && e.originalEvent.changedTouches[0]) {
					e.pageX = e.originalEvent.changedTouches[0].pageX;
					e.pageY = e.originalEvent.changedTouches[0].pageY;
					e.target = document.elementFromPoint(e.originalEvent.changedTouches[0].pageX - window.pageXOffset, e.originalEvent.changedTouches[0].pageY - window.pageYOffset);
				}
				if(!vakata_dnd.is_down) { return; }
				if(!vakata_dnd.is_drag) {
					if(
						Math.abs(e.pageX - vakata_dnd.init_x) > (vakata_dnd.is_touch ? $.vakata.dnd.settings.threshold_touch : $.vakata.dnd.settings.threshold) ||
						Math.abs(e.pageY - vakata_dnd.init_y) > (vakata_dnd.is_touch ? $.vakata.dnd.settings.threshold_touch : $.vakata.dnd.settings.threshold)
					) {
						if(vakata_dnd.helper) {
							vakata_dnd.helper.appendTo("body");
							vakata_dnd.helper_w = vakata_dnd.helper.outerWidth();
						}
						vakata_dnd.is_drag = true;
						$(vakata_dnd.target).one('click.vakata', false);
						/**
						 * triggered on the document when a drag starts
						 * @event
						 * @plugin dnd
						 * @name dnd_start.vakata
						 * @param {Mixed} data any data supplied with the call to $.vakata.dnd.start
						 * @param {DOM} element the DOM element being dragged
						 * @param {jQuery} helper the helper shown next to the mouse
						 * @param {Object} event the event that caused the start (probably mousemove)
						 */
						$.vakata.dnd._trigger("start", e);
					}
					else { return; }
				}

				var d  = false, w  = false,
					dh = false, wh = false,
					dw = false, ww = false,
					dt = false, dl = false,
					ht = false, hl = false;

				vakata_dnd.scroll_t = 0;
				vakata_dnd.scroll_l = 0;
				vakata_dnd.scroll_e = false;
				$($(e.target).parentsUntil("body").addBack().get().reverse())
					.filter(function () {
						return	(/^auto|scroll$/).test($(this).css("overflow")) &&
								(this.scrollHeight > this.offsetHeight || this.scrollWidth > this.offsetWidth);
					})
					.each(function () {
						var t = $(this), o = t.offset();
						if(this.scrollHeight > this.offsetHeight) {
							if(o.top + t.height() - e.pageY < $.vakata.dnd.settings.scroll_proximity)	{ vakata_dnd.scroll_t = 1; }
							if(e.pageY - o.top < $.vakata.dnd.settings.scroll_proximity)				{ vakata_dnd.scroll_t = -1; }
						}
						if(this.scrollWidth > this.offsetWidth) {
							if(o.left + t.width() - e.pageX < $.vakata.dnd.settings.scroll_proximity)	{ vakata_dnd.scroll_l = 1; }
							if(e.pageX - o.left < $.vakata.dnd.settings.scroll_proximity)				{ vakata_dnd.scroll_l = -1; }
						}
						if(vakata_dnd.scroll_t || vakata_dnd.scroll_l) {
							vakata_dnd.scroll_e = $(this);
							return false;
						}
					});

				if(!vakata_dnd.scroll_e) {
					d  = $(document); w = $(window);
					dh = d.height(); wh = w.height();
					dw = d.width(); ww = w.width();
					dt = d.scrollTop(); dl = d.scrollLeft();
					if(dh > wh && e.pageY - dt < $.vakata.dnd.settings.scroll_proximity)		{ vakata_dnd.scroll_t = -1;  }
					if(dh > wh && wh - (e.pageY - dt) < $.vakata.dnd.settings.scroll_proximity)	{ vakata_dnd.scroll_t = 1; }
					if(dw > ww && e.pageX - dl < $.vakata.dnd.settings.scroll_proximity)		{ vakata_dnd.scroll_l = -1; }
					if(dw > ww && ww - (e.pageX - dl) < $.vakata.dnd.settings.scroll_proximity)	{ vakata_dnd.scroll_l = 1; }
					if(vakata_dnd.scroll_t || vakata_dnd.scroll_l) {
						vakata_dnd.scroll_e = d;
					}
				}
				if(vakata_dnd.scroll_e) { $.vakata.dnd._scroll(true); }

				if(vakata_dnd.helper) {
					ht = parseInt(e.pageY + $.vakata.dnd.settings.helper_top, 10);
					hl = parseInt(e.pageX + $.vakata.dnd.settings.helper_left, 10);
					if(dh && ht + 25 > dh) { ht = dh - 50; }
					if(dw && hl + vakata_dnd.helper_w > dw) { hl = dw - (vakata_dnd.helper_w + 2); }
					vakata_dnd.helper.css({
						left	: hl + "px",
						top		: ht + "px"
					});
				}
				/**
				 * triggered on the document when a drag is in progress
				 * @event
				 * @plugin dnd
				 * @name dnd_move.vakata
				 * @param {Mixed} data any data supplied with the call to $.vakata.dnd.start
				 * @param {DOM} element the DOM element being dragged
				 * @param {jQuery} helper the helper shown next to the mouse
				 * @param {Object} event the event that caused this to trigger (most likely mousemove)
				 */
				$.vakata.dnd._trigger("move", e);
				return false;
			},