jquery-ui/ui/source/ui.draggable.js

/*
 * jQuery UI Draggable
 *
 * Copyright (c) 2008 Paul Bakaus
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * http://docs.jquery.com/UI/Draggables
 *
 * Depends:
 *	ui.core.js
 *
 * Revision: $Id: ui.draggable.js 5672 2008-05-23 04:11:30Z braeker $
 */

;(function($) {
	
	$.widget("ui.draggable", $.extend($.ui.mouse, {
		init: function() {
			
			//Initialize needed constants
			var o = this.options;
			
			this.mouseInit();
			
			//Position the node
			if(o.helper == 'original' && !(/(relative|absolute|fixed)/).test(this.element.css('position')))
				this.element.css('position', 'relative');
			
		},
		mouseStart: function(e) {
			var o = this.options;
			
			if (o.disabled || $(e.target).is('.ui-resizable-handle')) return false;
			
			var handle = !this.options.handle || !$(this.options.handle, this.element).length ? true : false;
			if(!handle) $(this.options.handle, this.element).each(function() {
				if(this == e.target) handle = true;
			});
			if (!handle) return false;
			
			if($.ui.ddmanager) $.ui.ddmanager.current = this;
			
			//Create and append the visible helper
			this.helper = $.isFunction(o.helper) ? $(o.helper.apply(this.element[0], [e])) : (o.helper == 'clone' ? this.element.clone() : this.element);
			if(!this.helper.parents('body').length) this.helper.appendTo((o.appendTo == 'parent' ? this.element[0].parentNode : o.appendTo));
			if(this.helper[0] != this.element[0] && !(/(fixed|absolute)/).test(this.helper.css("position"))) this.helper.css("position", "absolute");
			
			/*
			 * - Position generation -
			 * This block generates everything position related - it's the core of draggables.
			 */
			
			this.margins = {																				//Cache the margins
				left: (parseInt(this.element.css("marginLeft"),10) || 0),
				top: (parseInt(this.element.css("marginTop"),10) || 0)
			};		
			
			this.cssPosition = this.helper.css("position");													//Store the helper's css position
			this.offset = this.element.offset();															//The element's absolute position on the page
			this.offset = {																					//Substract the margins from the element's absolute offset
				top: this.offset.top - this.margins.top,
				left: this.offset.left - this.margins.left
			};
			
			this.offset.click = {																			//Where the click happened, relative to the element
				left: e.pageX - this.offset.left,
				top: e.pageY - this.offset.top
			};
			
			this.offsetParent = this.helper.offsetParent(); var po = this.offsetParent.offset();			//Get the offsetParent and cache its position
			this.offset.parent = {																			//Store its position plus border
				top: po.top + (parseInt(this.offsetParent.css("borderTopWidth"),10) || 0),
				left: po.left + (parseInt(this.offsetParent.css("borderLeftWidth"),10) || 0)
			};
			
			var p = this.element.position();																//This is a relative to absolute position minus the actual position calculation - only used for relative positioned helpers
			this.offset.relative = this.cssPosition == "relative" ? {
				top: p.top - (parseInt(this.helper.css("top"),10) || 0) + this.offsetParent[0].scrollTop,
				left: p.left - (parseInt(this.helper.css("left"),10) || 0) + this.offsetParent[0].scrollLeft
			} : { top: 0, left: 0 };
			
			this.originalPosition = this.generatePosition(e);												//Generate the original position
			this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };//Cache the helper size
			
			if(o.cursorAt) {
				if(o.cursorAt.left != undefined) this.offset.click.left = o.cursorAt.left;
				if(o.cursorAt.right != undefined) this.offset.click.left = this.helperProportions.width - o.cursorAt.right;
				if(o.cursorAt.top != undefined) this.offset.click.top = o.cursorAt.top;
				if(o.cursorAt.bottom != undefined) this.offset.click.top = this.helperProportions.height - o.cursorAt.bottom;
			}
			
			
			/*
			 * - Position constraining -
			 * Here we prepare position constraining like grid and containment.
			 */	
			
			if(o.containment) {
				if(o.containment == 'parent') o.containment = this.helper[0].parentNode;
				if(o.containment == 'document') this.containment = [0,0,$(document).width(), ($(document).height() || document.body.parentNode.scrollHeight)];
				if(!(/^(document|window|parent)$/).test(o.containment)) {
					var ce = $(o.containment)[0];
					var co = $(o.containment).offset();
					
					this.containment = [
						co.left + (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left,
						co.top + (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top,
						co.left+Math.max(ce.scrollWidth,ce.offsetWidth) - (parseInt($(ce).css("borderLeftWidth"),10) || 0) - this.offset.relative.left - this.offset.parent.left - this.helperProportions.width - this.margins.left - (parseInt(this.element.css("marginRight"),10) || 0),
						co.top+Math.max(ce.scrollHeight,ce.offsetHeight) - (parseInt($(ce).css("borderTopWidth"),10) || 0) - this.offset.relative.top - this.offset.parent.top - this.helperProportions.height - this.margins.top - (parseInt(this.element.css("marginBottom"),10) || 0)
					];
				}
			}
			
			//Call plugins and callbacks
			this.propagate("start", e);
			
			this.helperProportions = { width: this.helper.outerWidth(), height: this.helper.outerHeight() };//Recache the helper size
			if ($.ui.ddmanager && !o.dropBehaviour) $.ui.ddmanager.prepareOffsets(this, e);
			
			return true;
		},
		convertPositionTo: function(d, pos) {
			if(!pos) pos = this.position;
			var mod = d == "absolute" ? 1 : -1;
			return {
				top: (
					pos.top																	// the calculated relative position
					+ this.offset.relative.top	* mod										// Only for relative positioned nodes: Relative offset from element to offset parent
					+ this.offset.parent.top * mod											// The offsetParent's offset without borders (offset + border)
					- (this.cssPosition == "fixed" ? 0 : this.offsetParent[0].scrollTop) * mod	// The offsetParent's scroll position, not if the element is fixed
					+ this.margins.top * mod												//Add the margin (you don't want the margin counting in intersection methods)
				),
				left: (
					pos.left																// the calculated relative position
					+ this.offset.relative.left	* mod										// Only for relative positioned nodes: Relative offset from element to offset parent
					+ this.offset.parent.left * mod											// The offsetParent's offset without borders (offset + border)
					- (this.cssPosition == "fixed" ? 0 : this.offsetParent[0].scrollLeft) * mod	// The offsetParent's scroll position, not if the element is fixed
					+ this.margins.left * mod												//Add the margin (you don't want the margin counting in intersection methods)
				)
			};
		},
		generatePosition: function(e) {
			
			var o = this.options;
			var position = {
				top: (
					e.pageY																	// The absolute mouse position
					- this.offset.click.top													// Click offset (relative to the element)
					- this.offset.relative.top												// Only for relative positioned nodes: Relative offset from element to offset parent
					- this.offset.parent.top												// The offsetParent's offset without borders (offset + border)
					+ (this.cssPosition == "fixed" ? 0 : this.offsetParent[0].scrollTop)	// The offsetParent's scroll position, not if the element is fixed
				),
				left: (
					e.pageX																	// The absolute mouse position
					- this.offset.click.left												// Click offset (relative to the element)
					- this.offset.relative.left												// Only for relative positioned nodes: Relative offset from element to offset parent
					- this.offset.parent.left												// The offsetParent's offset without borders (offset + border)
					+ (this.cssPosition == "fixed" ? 0 : this.offsetParent[0].scrollLeft)	// The offsetParent's scroll position, not if the element is fixed
				)
			};
			
			if(!this.originalPosition) return position;										//If we are not dragging yet, we won't check for options
			
			/*
			 * - Position constraining -
			 * Constrain the position to a mix of grid, containment.
			 */
			if(this.containment) {
				if(position.left < this.containment[0]) position.left = this.containment[0];
				if(position.top < this.containment[1]) position.top = this.containment[1];
				if(position.left > this.containment[2]) position.left = this.containment[2];
				if(position.top > this.containment[3]) position.top = this.containment[3];
			}
			
			if(o.grid) {
				var top = this.originalPosition.top + Math.round((position.top - this.originalPosition.top) / o.grid[1]) * o.grid[1];
				position.top = this.containment ? (!(top < this.containment[1] || top > this.containment[3]) ? top : (!(top < this.containment[1]) ? top - o.grid[1] : top + o.grid[1])) : top;
				
				var left = this.originalPosition.left + Math.round((position.left - this.originalPosition.left) / o.grid[0]) * o.grid[0];
				position.left = this.containment ? (!(left < this.containment[0] || left > this.containment[2]) ? left : (!(left < this.containment[0]) ? left - o.grid[0] : left + o.grid[0])) : left;
			}
			
			return position;
		},
		mouseDrag: function(e) {
			
			//Compute the helpers position
			this.position = this.generatePosition(e);
			this.positionAbs = this.convertPositionTo("absolute");
			
			//Call plugins and callbacks and use the resulting position if something is returned		
			this.position = this.propagate("drag", e) || this.position;
			
			if(!this.options.axis || this.options.axis == "x") this.helper[0].style.left = this.position.left+'px';
			if(!this.options.axis || this.options.axis == "y") this.helper[0].style.top = this.position.top+'px';
			if($.ui.ddmanager) $.ui.ddmanager.drag(this, e);
			
			return false;
		},
		mouseStop: function(e) {
			
			//If we are using droppables, inform the manager about the drop
			if ($.ui.ddmanager && !this.options.dropBehaviour)
				$.ui.ddmanager.drop(this, e);
				
			if(this.options.revert) {
				var self = this;
				$(this.helper).animate(this.originalPosition, parseInt(this.options.revert, 10) || 500, function() {
					self.propagate("stop", e);
					self.clear();
				});
			} else {
				this.propagate("stop", e);
				this.clear();
			}
			
			return false;
		},
		clear: function() {
			if(this.options.helper != 'original' && !this.cancelHelperRemoval) this.helper.remove();
			if($.ui.ddmanager) $.ui.ddmanager.current = null;
			this.helper = null;
			this.cancelHelperRemoval = false;
		},
		
		// From now on bulk stuff - mainly helpers
		plugins: {},
		uiHash: function(e) {
			return {
				helper: this.helper,
				position: this.position,
				absolutePosition: this.positionAbs,
				options: this.options			
			};
		},
		propagate: function(n,e) {
			$.ui.plugin.call(this, n, [e, this.uiHash()]);
			return this.element.triggerHandler(n == "drag" ? n : "drag"+n, [e, this.uiHash()], this.options[n]);
		},
		destroy: function() {
			if(!this.element.data('draggable')) return;
			this.element.removeData("draggable").unbind(".draggable");
			this.mouseDestroy();
		}
	}));

	$.extend($.ui.draggable, {
		defaults: {
			distance: 0,
			delay: 0,
			cancel: ":input,button",
			helper: "original",
			appendTo: "parent"
		}
	});

	$.ui.plugin.add("draggable", "cursor", {
		start: function(e, ui) {
			var t = $('body');
			if (t.css("cursor")) ui.options._cursor = t.css("cursor");
			t.css("cursor", ui.options.cursor);
		},
		stop: function(e, ui) {
			if (ui.options._cursor) $('body').css("cursor", ui.options._cursor);
		}
	});
	
	$.ui.plugin.add("draggable", "zIndex", {
		start: function(e, ui) {
			var t = $(ui.helper);
			if(t.css("zIndex")) ui.options._zIndex = t.css("zIndex");
			t.css('zIndex', ui.options.zIndex);
		},
		stop: function(e, ui) {
			if(ui.options._zIndex) $(ui.helper).css('zIndex', ui.options._zIndex);
		}
	});
	
	$.ui.plugin.add("draggable", "opacity", {
		start: function(e, ui) {
			var t = $(ui.helper);
			if(t.css("opacity")) ui.options._opacity = t.css("opacity");
			t.css('opacity', ui.options.opacity);
		},
		stop: function(e, ui) {
			if(ui.options._opacity) $(ui.helper).css('opacity', ui.options._opacity);
		}
	});
	
	$.ui.plugin.add("draggable", "iframeFix", {
		start: function(e, ui) {
			$(ui.options.iframeFix === true ? "iframe" : ui.options.iframeFix).each(function() {					
				$('<div class="ui-draggable-iframeFix" style="background: #fff;"></div>')
				.css({
					width: this.offsetWidth+"px", height: this.offsetHeight+"px",
					position: "absolute", opacity: "0.001", zIndex: 1000
				})
				.css($(this).offset())
				.appendTo("body");
			});
		},
		stop: function(e, ui) {
			$("div.DragDropIframeFix").each(function() { this.parentNode.removeChild(this); }); //Remove frame helpers	
		}
	});
	
	$.ui.plugin.add("draggable", "scroll", {
		start: function(e, ui) {
			var o = ui.options;
			var i = $(this).data("draggable");
			o.scrollSensitivity	= o.scrollSensitivity || 20;
			o.scrollSpeed		= o.scrollSpeed || 20;
			
			i.overflowY = function(el) {
				do { if(/auto|scroll/.test(el.css('overflow')) || (/auto|scroll/).test(el.css('overflow-y'))) return el; el = el.parent(); } while (el[0].parentNode);
				return $(document);
			}(this);
			i.overflowX = function(el) {
				do { if(/auto|scroll/.test(el.css('overflow')) || (/auto|scroll/).test(el.css('overflow-x'))) return el; el = el.parent(); } while (el[0].parentNode);
				return $(document);
			}(this);
			
			if(i.overflowY[0] != document && i.overflowY[0].tagName != 'HTML') i.overflowYOffset = i.overflowY.offset();
			if(i.overflowX[0] != document && i.overflowX[0].tagName != 'HTML') i.overflowXOffset = i.overflowX.offset();
			
		},
		drag: function(e, ui) {
			
			var o = ui.options;
			var i = $(this).data("draggable");
			
			if(i.overflowY[0] != document && i.overflowY[0].tagName != 'HTML') {
				if((i.overflowYOffset.top + i.overflowY[0].offsetHeight) - e.pageY < o.scrollSensitivity)
					i.overflowY[0].scrollTop = i.overflowY[0].scrollTop + o.scrollSpeed;
				if(e.pageY - i.overflowYOffset.top < o.scrollSensitivity)
					i.overflowY[0].scrollTop = i.overflowY[0].scrollTop - o.scrollSpeed;
								
			} else {
				if(e.pageY - $(document).scrollTop() < o.scrollSensitivity)
					$(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
				if($(window).height() - (e.pageY - $(document).scrollTop()) < o.scrollSensitivity)
					$(document).scrollTop($(document).scrollTop() + o.scrollSpeed);
			}
			
			if(i.overflowX[0] != document && i.overflowX[0].tagName != 'HTML') {
				if((i.overflowXOffset.left + i.overflowX[0].offsetWidth) - e.pageX < o.scrollSensitivity)
					i.overflowX[0].scrollLeft = i.overflowX[0].scrollLeft + o.scrollSpeed;
				if(e.pageX - i.overflowXOffset.left < o.scrollSensitivity)
					i.overflowX[0].scrollLeft = i.overflowX[0].scrollLeft - o.scrollSpeed;
			} else {
				if(e.pageX - $(document).scrollLeft() < o.scrollSensitivity)
					$(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
				if($(window).width() - (e.pageX - $(document).scrollLeft()) < o.scrollSensitivity)
					$(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);
			}
			
		}
	});
	
	$.ui.plugin.add("draggable", "snap", {
		start: function(e, ui) {
			
			var inst = $(this).data("draggable");
			inst.snapElements = [];
			$(ui.options.snap === true ? '.ui-draggable' : ui.options.snap).each(function() {
				var $t = $(this); var $o = $t.offset();
				if(this != inst.element[0]) inst.snapElements.push({
					item: this,
					width: $t.outerWidth(), height: $t.outerHeight(),
					top: $o.top, left: $o.left
				});
			});
			
		},
		drag: function(e, ui) {
			
			var inst = $(this).data("draggable");
			var d = ui.options.snapTolerance || 20;
			var x1 = ui.absolutePosition.left, x2 = x1 + inst.helperProportions.width,
				y1 = ui.absolutePosition.top, y2 = y1 + inst.helperProportions.height;
			
			for (var i = inst.snapElements.length - 1; i >= 0; i--){
				
				var l = inst.snapElements[i].left, r = l + inst.snapElements[i].width, 
					t = inst.snapElements[i].top, b = t + inst.snapElements[i].height;
				
				//Yes, I know, this is insane ;)
				if(!((l-d < x1 && x1 < r+d && t-d < y1 && y1 < b+d) || (l-d < x1 && x1 < r+d && t-d < y2 && y2 < b+d) || (l-d < x2 && x2 < r+d && t-d < y1 && y1 < b+d) || (l-d < x2 && x2 < r+d && t-d < y2 && y2 < b+d))) continue;
				
				if(ui.options.snapMode != 'inner') {
					var ts = Math.abs(t - y2) <= 20;
					var bs = Math.abs(b - y1) <= 20;
					var ls = Math.abs(l - x2) <= 20;
					var rs = Math.abs(r - x1) <= 20;
					if(ts) ui.position.top = inst.convertPositionTo("relative", { top: t - inst.helperProportions.height, left: 0 }).top;
					if(bs) ui.position.top = inst.convertPositionTo("relative", { top: b, left: 0 }).top;
					if(ls) ui.position.left = inst.convertPositionTo("relative", { top: 0, left: l - inst.helperProportions.width }).left;
					if(rs) ui.position.left = inst.convertPositionTo("relative", { top: 0, left: r }).left;
				}
				
				if(ui.options.snapMode != 'outer') {
					var ts = Math.abs(t - y1) <= 20;
					var bs = Math.abs(b - y2) <= 20;
					var ls = Math.abs(l - x1) <= 20;
					var rs = Math.abs(r - x2) <= 20;
					if(ts) ui.position.top = inst.convertPositionTo("relative", { top: t, left: 0 }).top;
					if(bs) ui.position.top = inst.convertPositionTo("relative", { top: b - inst.helperProportions.height, left: 0 }).top;
					if(ls) ui.position.left = inst.convertPositionTo("relative", { top: 0, left: l }).left;
					if(rs) ui.position.left = inst.convertPositionTo("relative", { top: 0, left: r - inst.helperProportions.width }).left;
				}
				
			};
		}
	});
	
	$.ui.plugin.add("draggable", "connectToSortable", {
		start: function(e,ui) {
			var inst = $(this).data("draggable");
			inst.sortable = $.data($(ui.options.connectToSortable)[0], 'sortable');
			inst.sortableOffset = inst.sortable.element.offset();
			inst.sortableOuterWidth = inst.sortable.element.outerWidth();
			inst.sortableOuterHeight = inst.sortable.element.outerHeight();
			if(inst.sortable.options.revert) inst.sortable.shouldRevert = true;
		},
		stop: function(e,ui) {
			//If we are still over the sortable, we fake the stop event of the sortable, but also remove helper
			var instDraggable = $(this).data("draggable");
			var inst = instDraggable.sortable;
			
			if(inst.isOver) {
				inst.isOver = 0;
				instDraggable.cancelHelperRemoval = true; //Don't remove the helper in the draggable instance
				inst.cancelHelperRemoval = false; //Remove it in the sortable instance (so sortable plugins like revert still work)
				if(inst.shouldRevert) inst.options.revert = true; //revert here
				inst.stop(e);
				inst.options.helper = "original";
			}
		},
		drag: function(e,ui) {
			//This is handy: We reuse the intersectsWith method for checking if the current draggable helper
			//intersects with the sortable container
			var instDraggable = $(this).data("draggable");
			var inst = instDraggable.sortable;
			instDraggable.position.absolute = ui.absolutePosition; //Sorry, this is an ugly API fix
			
			if(inst.intersectsWith.call(instDraggable, {
				left: instDraggable.sortableOffset.left, top: instDraggable.sortableOffset.top,
				width: instDraggable.sortableOuterWidth, height: instDraggable.sortableOuterHeight
			})) {
				//If it intersects, we use a little isOver variable and set it once, so our move-in stuff gets fired only once
				if(!inst.isOver) {
					inst.isOver = 1;
					
					//Cache the width/height of the new helper
					var height = inst.options.placeholderElement ? $(inst.options.placeholderElement, $(inst.options.items, inst.element)).innerHeight() : $(inst.options.items, inst.element).innerHeight();
					var width = inst.options.placeholderElement ? $(inst.options.placeholderElement, $(inst.options.items, inst.element)).innerWidth() : $(inst.options.items, inst.element).innerWidth();
					
					//Now we fake the start of dragging for the sortable instance,
					//by cloning the list group item, appending it to the sortable and using it as inst.currentItem
					//We can then fire the start event of the sortable with our passed browser event, and our own helper (so it doesn't create a new one)
					inst.currentItem = $(this).clone().appendTo(inst.element);
					inst.options.helper = function() { return ui.helper[0]; };
					inst.start(e);
					
					//Because the browser event is way off the new appended portlet, we modify a couple of variables to reflect the changes
					inst.clickOffset.top = instDraggable.offset.click.top;
					inst.clickOffset.left = instDraggable.offset.click.left;
					inst.offset.left -= ui.absolutePosition.left - inst.position.absolute.left;
					inst.offset.top -= ui.absolutePosition.top - inst.position.absolute.top;
					
					//Do a nifty little helper animation: Animate it to the portlet's size (just takes the first 'li' element in the sortable now)
					inst.helperProportions = {width: width, height: height}; //We have to reset the helper proportions, because we are doing our animation there
					ui.helper.animate({height: height, width: width}, 500);
					instDraggable.propagate("toSortable", e);
				
				}
				
				//Provided we did all the previous steps, we can fire the drag event of the sortable on every draggable drag, when it intersects with the sortable
				if(inst.currentItem) inst.drag(e);
				
			} else {
				
				//If it doesn't intersect with the sortable, and it intersected before,
				//we fake the drag stop of the sortable, but make sure it doesn't remove the helper by using cancelHelperRemoval
				if(inst.isOver) {
					inst.isOver = 0;
					inst.cancelHelperRemoval = true;
					inst.options.revert = false; //No revert here
					inst.stop(e);
					inst.options.helper = "original";
					
					//Now we remove our currentItem, the list group clone again, and the placeholder, and animate the helper back to it's original size
					inst.currentItem.remove();
					inst.placeholder.remove();
					
					ui.helper.animate({ height: this.innerHeight(), width: this.innerWidth() }, 500);
					instDraggable.propagate("fromSortable", e);
				}
				
			};
		}
	});
	
	$.ui.plugin.add("draggable", "stack", {
		start: function(e,ui) {
			var group = $.makeArray($(ui.options.stack.group)).sort(function(a,b) {
				return (parseInt($(a).css("zIndex"),10) || ui.options.stack.min) - (parseInt($(b).css("zIndex"),10) || ui.options.stack.min);
			});
			
			$(group).each(function(i) {
				this.style.zIndex = ui.options.stack.min + i;
			});
			
			this[0].style.zIndex = ui.options.stack.min + group.length;
		}
	});
	
})(jQuery);