Tooltip.js

define([
	"dojo/_base/array", // array.forEach array.indexOf array.map
	"dojo/_base/declare", // declare
	"dojo/_base/fx", // fx.fadeIn fx.fadeOut
	"dojo/dom", // dom.byId
	"dojo/dom-class", // domClass.add
	"dojo/dom-geometry", // domGeometry.position
	"dojo/dom-style", // domStyle.set, domStyle.get
	"dojo/_base/lang", // lang.hitch lang.isArrayLike
	"dojo/mouse",
	"dojo/on",
	"dojo/sniff", // has("ie")
	"./_base/manager",	// manager.defaultDuration
	"./place",
	"./_WidgetBase",
	"./_TemplatedMixin",
	"./BackgroundIframe",
	"dojo/text!./templates/Tooltip.html",
	"./main"		// sets dijit.showTooltip etc. for back-compat
], function(array, declare, fx, dom, domClass, domGeometry, domStyle, lang, mouse, on, has,
			manager, place, _WidgetBase, _TemplatedMixin, BackgroundIframe, template, dijit){

	// module:
	//		dijit/Tooltip


	// TODO: Tooltip should really share more positioning code with TooltipDialog, like:
	//		- the orient() method
	//		- the connector positioning code in show()
	//		- the dijitTooltip[Dialog] class
	//
	// The problem is that Tooltip's implementation supplies it's own <iframe> and interacts directly
	// with dijit/place, rather than going through dijit/popup like TooltipDialog and other popups (ex: Menu).

	var MasterTooltip = declare("dijit._MasterTooltip", [_WidgetBase, _TemplatedMixin], {
		// summary:
		//		Internal widget that holds the actual tooltip markup,
		//		which occurs once per page.
		//		Called by Tooltip widgets which are just containers to hold
		//		the markup
		// tags:
		//		protected

		// duration: Integer
		//		Milliseconds to fade in/fade out
		duration: manager.defaultDuration,

		templateString: template,

		postCreate: function(){
			this.ownerDocumentBody.appendChild(this.domNode);

			this.bgIframe = new BackgroundIframe(this.domNode);

			// Setup fade-in and fade-out functions.
			this.fadeIn = fx.fadeIn({ node: this.domNode, duration: this.duration, onEnd: lang.hitch(this, "_onShow") });
			this.fadeOut = fx.fadeOut({ node: this.domNode, duration: this.duration, onEnd: lang.hitch(this, "_onHide") });
		},

		show: function(innerHTML, aroundNode, position, rtl, textDir){
			// summary:
			//		Display tooltip w/specified contents to right of specified node
			//		(To left if there's no space on the right, or if rtl == true)
			// innerHTML: String
			//		Contents of the tooltip
			// aroundNode: DomNode|dijit/place.__Rectangle
			//		Specifies that tooltip should be next to this node / area
			// position: String[]?
			//		List of positions to try to position tooltip (ex: ["right", "above"])
			// rtl: Boolean?
			//		Corresponds to `WidgetBase.dir` attribute, where false means "ltr" and true
			//		means "rtl"; specifies GUI direction, not text direction.
			// textDir: String?
			//		Corresponds to `WidgetBase.textdir` attribute; specifies direction of text.


			if(this.aroundNode && this.aroundNode === aroundNode && this.containerNode.innerHTML == innerHTML){
				return;
			}

			if(this.fadeOut.status() == "playing"){
				// previous tooltip is being hidden; wait until the hide completes then show new one
				this._onDeck=arguments;
				return;
			}
			this.containerNode.innerHTML=innerHTML;

			if(textDir){
				this.set("textDir", textDir);
			}

			this.containerNode.align = rtl? "right" : "left"; //fix the text alignment

			var pos = place.around(this.domNode, aroundNode,
				position && position.length ? position : Tooltip.defaultPosition, !rtl, lang.hitch(this, "orient"));

			// Position the tooltip connector for middle alignment.
			// This could not have been done in orient() since the tooltip wasn't positioned at that time.
			var aroundNodeCoords = pos.aroundNodePos;
			if(pos.corner.charAt(0) == 'M' && pos.aroundCorner.charAt(0) == 'M'){
				this.connectorNode.style.top = aroundNodeCoords.y + ((aroundNodeCoords.h - this.connectorNode.offsetHeight) >> 1) - pos.y + "px";
				this.connectorNode.style.left = "";
			}else if(pos.corner.charAt(1) == 'M' && pos.aroundCorner.charAt(1) == 'M'){
				this.connectorNode.style.left = aroundNodeCoords.x + ((aroundNodeCoords.w - this.connectorNode.offsetWidth) >> 1) - pos.x + "px";
			}else{
				// Not *-centered, but just above/below/after/before
				this.connectorNode.style.left = "";
				this.connectorNode.style.top = "";
			}

			// show it
			domStyle.set(this.domNode, "opacity", 0);
			this.fadeIn.play();
			this.isShowingNow = true;
			this.aroundNode = aroundNode;
		},

		orient: function(/*DomNode*/ node, /*String*/ aroundCorner, /*String*/ tooltipCorner, /*Object*/ spaceAvailable, /*Object*/ aroundNodeCoords){
			// summary:
			//		Private function to set CSS for tooltip node based on which position it's in.
			//		This is called by the dijit popup code.   It will also reduce the tooltip's
			//		width to whatever width is available
			// tags:
			//		protected

			this.connectorNode.style.top = ""; //reset to default

			var heightAvailable = spaceAvailable.h,
				widthAvailable = spaceAvailable.w;

			node.className = "dijitTooltip " +
				{
					"MR-ML": "dijitTooltipRight",
					"ML-MR": "dijitTooltipLeft",
					"TM-BM": "dijitTooltipAbove",
					"BM-TM": "dijitTooltipBelow",
					"BL-TL": "dijitTooltipBelow dijitTooltipABLeft",
					"TL-BL": "dijitTooltipAbove dijitTooltipABLeft",
					"BR-TR": "dijitTooltipBelow dijitTooltipABRight",
					"TR-BR": "dijitTooltipAbove dijitTooltipABRight",
					"BR-BL": "dijitTooltipRight",
					"BL-BR": "dijitTooltipLeft"
				}[aroundCorner + "-" + tooltipCorner];

			// reset width; it may have been set by orient() on a previous tooltip show()
			this.domNode.style.width = "auto";

			// Reduce tooltip's width to the amount of width available, so that it doesn't overflow screen.
			// Note that sometimes widthAvailable is negative, but we guard against setting style.width to a
			// negative number since that causes an exception on IE.
			var size = domGeometry.position(this.domNode);
			if(has("ie") == 9){
				// workaround strange IE9 bug where setting width to offsetWidth causes words to wrap
				size.w += 2;
			}

			var width = Math.min((Math.max(widthAvailable,1)), size.w);

			domGeometry.setMarginBox(this.domNode, {w: width});

			// Reposition the tooltip connector.
			if(tooltipCorner.charAt(0) == 'B' && aroundCorner.charAt(0) == 'B'){
				var bb = domGeometry.position(node);
				var tooltipConnectorHeight = this.connectorNode.offsetHeight;
				if(bb.h > heightAvailable){
					// The tooltip starts at the top of the page and will extend past the aroundNode
					var aroundNodePlacement = heightAvailable - ((aroundNodeCoords.h + tooltipConnectorHeight) >> 1);
					this.connectorNode.style.top = aroundNodePlacement + "px";
					this.connectorNode.style.bottom = "";
				}else{
					// Align center of connector with center of aroundNode, except don't let bottom
					// of connector extend below bottom of tooltip content, or top of connector
					// extend past top of tooltip content
					this.connectorNode.style.bottom = Math.min(
						Math.max(aroundNodeCoords.h/2 - tooltipConnectorHeight/2, 0),
						bb.h - tooltipConnectorHeight) + "px";
					this.connectorNode.style.top = "";
				}
			}else{
				// reset the tooltip back to the defaults
				this.connectorNode.style.top = "";
				this.connectorNode.style.bottom = "";
			}

			return Math.max(0, size.w - widthAvailable);
		},

		_onShow: function(){
			// summary:
			//		Called at end of fade-in operation
			// tags:
			//		protected
			if(has("ie")){
				// the arrow won't show up on a node w/an opacity filter
				this.domNode.style.filter="";
			}
		},

		hide: function(aroundNode){
			// summary:
			//		Hide the tooltip

			if(this._onDeck && this._onDeck[1] == aroundNode){
				// this hide request is for a show() that hasn't even started yet;
				// just cancel the pending show()
				this._onDeck=null;
			}else if(this.aroundNode === aroundNode){
				// this hide request is for the currently displayed tooltip
				this.fadeIn.stop();
				this.isShowingNow = false;
				this.aroundNode = null;
				this.fadeOut.play();
			}else{
				// just ignore the call, it's for a tooltip that has already been erased
			}
		},

		_onHide: function(){
			// summary:
			//		Called at end of fade-out operation
			// tags:
			//		protected

			this.domNode.style.cssText="";	// to position offscreen again
			this.containerNode.innerHTML="";
			if(this._onDeck){
				// a show request has been queued up; do it now
				this.show.apply(this, this._onDeck);
				this._onDeck=null;
			}
		}
	});

	if(has("dojo-bidi")){
		MasterTooltip.extend({
			_setAutoTextDir: function(/*Object*/node){
				// summary:
				//		Resolve "auto" text direction for children nodes
				// tags:
				//		private

				this.applyTextDir(node);
				array.forEach(node.children, function(child){ this._setAutoTextDir(child); }, this);
			},

			_setTextDirAttr: function(/*String*/ textDir){
				// summary:
				//		Setter for textDir.
				// description:
				//		Users shouldn't call this function; they should be calling
				//		set('textDir', value)
				// tags:
				//		private

				this._set("textDir", textDir);

				if (textDir == "auto"){
					this._setAutoTextDir(this.containerNode);
				}else{
					this.containerNode.dir = this.textDir;
				}
			}
		});
	}

	dijit.showTooltip = function(innerHTML, aroundNode, position, rtl, textDir){
		// summary:
		//		Static method to display tooltip w/specified contents in specified position.
		//		See description of dijit/Tooltip.defaultPosition for details on position parameter.
		//		If position is not specified then dijit/Tooltip.defaultPosition is used.
		// innerHTML: String
		//		Contents of the tooltip
		// aroundNode: place.__Rectangle
		//		Specifies that tooltip should be next to this node / area
		// position: String[]?
		//		List of positions to try to position tooltip (ex: ["right", "above"])
		// rtl: Boolean?
		//		Corresponds to `WidgetBase.dir` attribute, where false means "ltr" and true
		//		means "rtl"; specifies GUI direction, not text direction.
		// textDir: String?
		//		Corresponds to `WidgetBase.textdir` attribute; specifies direction of text.

		// After/before don't work, but for back-compat convert them to the working after-centered, before-centered.
		// Possibly remove this in 2.0.   Alternately, get before/after to work.
		if(position){
			position = array.map(position, function(val){
				return {after: "after-centered", before: "before-centered"}[val] || val;
			});
		}

		if(!Tooltip._masterTT){ dijit._masterTT = Tooltip._masterTT = new MasterTooltip(); }
		return Tooltip._masterTT.show(innerHTML, aroundNode, position, rtl, textDir);
	};

	dijit.hideTooltip = function(aroundNode){
		// summary:
		//		Static method to hide the tooltip displayed via showTooltip()
		return Tooltip._masterTT && Tooltip._masterTT.hide(aroundNode);
	};

	var Tooltip = declare("dijit.Tooltip", _WidgetBase, {
		// summary:
		//		Pops up a tooltip (a help message) when you hover over a node.
		//		Also provides static show() and hide() methods that can be used without instantiating a dijit/Tooltip.

		// label: String
		//		Text to display in the tooltip.
		//		Specified as innerHTML when creating the widget from markup.
		label: "",

		// showDelay: Integer
		//		Number of milliseconds to wait after hovering over/focusing on the object, before
		//		the tooltip is displayed.
		showDelay: 400,

		// connectId: String|String[]|DomNode|DomNode[]
		//		Id of domNode(s) to attach the tooltip to.
		//		When user hovers over specified dom node(s), the tooltip will appear.
		connectId: [],

		// position: String[]
		//		See description of `dijit/Tooltip.defaultPosition` for details on position parameter.
		position: [],

		// selector: String?
		//		CSS expression to apply this Tooltip to descendants of connectIds, rather than to
		//		the nodes specified by connectIds themselves.    Useful for applying a Tooltip to
		//		a range of rows in a table, tree, etc.   Use in conjunction with getContent() parameter.
		//		Ex: connectId: myTable, selector: "tr", getContent: function(node){ return ...; }
		//
		//		The application must require() an appropriate level of dojo/query to handle the selector.
		selector: "",

		// TODO: in 2.0 remove support for multiple connectIds.   selector gives the same effect.
		// So, change connectId to a "", remove addTarget()/removeTarget(), etc.

		_setConnectIdAttr: function(/*String|String[]}DomNode|DomNode[]*/ newId){
			// summary:
			//		Connect to specified node(s)

			// Remove connections to old nodes (if there are any)
			array.forEach(this._connections || [], function(nested){
				array.forEach(nested, function(handle){ handle.remove(); });
			}, this);

			// Make array of id's to connect to, excluding entries for nodes that don't exist yet, see startup()
			this._connectIds = array.filter(lang.isArrayLike(newId) ? newId : (newId ? [newId] : []),
					function(id){ return dom.byId(id, this.ownerDocument); }, this);

			// Make connections
			this._connections = array.map(this._connectIds, function(id){
				var node = dom.byId(id, this.ownerDocument),
					selector = this.selector,
					delegatedEvent = selector ?
						function(eventType){ return on.selector(selector, eventType); } :
						function(eventType){ return eventType; },
					self = this;
				return [
					on(node, delegatedEvent(mouse.enter), function(){
						self._onHover(this);
					}),
					on(node, delegatedEvent("focusin"), function(){
						self._onHover(this);
					}),
					on(node, delegatedEvent(mouse.leave), lang.hitch(self, "_onUnHover")),
					on(node, delegatedEvent("focusout"), lang.hitch(self, "_onUnHover"))
				];
			}, this);

			this._set("connectId", newId);
		},

		addTarget: function(/*OomNode|String*/ node){
			// summary:
			//		Attach tooltip to specified node if it's not already connected

			// TODO: remove in 2.0 and just use set("connectId", ...) interface

			var id = node.id || node;
			if(array.indexOf(this._connectIds, id) == -1){
				this.set("connectId", this._connectIds.concat(id));
			}
		},

		removeTarget: function(/*DomNode|String*/ node){
			// summary:
			//		Detach tooltip from specified node

			// TODO: remove in 2.0 and just use set("connectId", ...) interface

			var id = node.id || node,	// map from DOMNode back to plain id string
				idx = array.indexOf(this._connectIds, id);
			if(idx >= 0){
				// remove id (modifies original this._connectIds but that's OK in this case)
				this._connectIds.splice(idx, 1);
				this.set("connectId", this._connectIds);
			}
		},

		buildRendering: function(){
			this.inherited(arguments);
			domClass.add(this.domNode,"dijitTooltipData");
		},

		startup: function(){
			this.inherited(arguments);

			// If this tooltip was created in a template, or for some other reason the specified connectId[s]
			// didn't exist during the widget's initialization, then connect now.
			var ids = this.connectId;
			array.forEach(lang.isArrayLike(ids) ? ids : [ids], this.addTarget, this);
		},

		getContent: function(/*DomNode*/ node){
			// summary:
			//		User overridable function that return the text to display in the tooltip.
			// tags:
			//		extension
			return this.label || this.domNode.innerHTML;
		},

		_onHover: function(/*DomNode*/ target){
			// summary:
			//		Despite the name of this method, it actually handles both hover and focus
			//		events on the target node, setting a timer to show the tooltip.
			// tags:
			//		private
			if(!this._showTimer){
				this._showTimer = this.defer(function(){ this.open(target); }, this.showDelay);
			}
		},

		_onUnHover: function(){
			// summary:
			//		Despite the name of this method, it actually handles both mouseleave and blur
			//		events on the target node, hiding the tooltip.
			// tags:
			//		private

			if(this._showTimer){
				this._showTimer.remove();
				delete this._showTimer;
			}
			this.close();
		},

		open: function(/*DomNode*/ target){
			// summary:
			//		Display the tooltip; usually not called directly.
			// tags:
			//		private

			if(this._showTimer){
				this._showTimer.remove();
				delete this._showTimer;
			}

			var content = this.getContent(target);
			if(!content){
				return;
			}
			Tooltip.show(content, target, this.position, !this.isLeftToRight(), this.textDir);

			this._connectNode = target;		// _connectNode means "tooltip currently displayed for this node"
			this.onShow(target, this.position);
		},

		close: function(){
			// summary:
			//		Hide the tooltip or cancel timer for show of tooltip
			// tags:
			//		private

			if(this._connectNode){
				// if tooltip is currently shown
				Tooltip.hide(this._connectNode);
				delete this._connectNode;
				this.onHide();
			}
			if(this._showTimer){
				// if tooltip is scheduled to be shown (after a brief delay)
				this._showTimer.remove();
				delete this._showTimer;
			}
		},

		onShow: function(/*===== target, position =====*/){
			// summary:
			//		Called when the tooltip is shown
			// tags:
			//		callback
		},

		onHide: function(){
			// summary:
			//		Called when the tooltip is hidden
			// tags:
			//		callback
		},

		destroy: function(){
			this.close();

			// Remove connections manually since they aren't registered to be removed by _WidgetBase
			array.forEach(this._connections || [], function(nested){
				array.forEach(nested, function(handle){ handle.remove(); });
			}, this);

			this.inherited(arguments);
		}
	});

	Tooltip._MasterTooltip = MasterTooltip;		// for monkey patching
	Tooltip.show = dijit.showTooltip;		// export function through module return value
	Tooltip.hide = dijit.hideTooltip;		// export function through module return value

	Tooltip.defaultPosition = ["after-centered", "before-centered"];

	/*=====
	lang.mixin(Tooltip, {
		 // defaultPosition: String[]
		 //		This variable controls the position of tooltips, if the position is not specified to
		 //		the Tooltip widget or *TextBox widget itself.  It's an array of strings with the values
		 //		possible for `dijit/place.around()`.   The recommended values are:
		 //
		 //		- before-centered: centers tooltip to the left of the anchor node/widget, or to the right
		 //		  in the case of RTL scripts like Hebrew and Arabic
		 //		- after-centered: centers tooltip to the right of the anchor node/widget, or to the left
		 //		  in the case of RTL scripts like Hebrew and Arabic
		 //		- above-centered: tooltip is centered above anchor node
		 //		- below-centered: tooltip is centered above anchor node
		 //
		 //		The list is positions is tried, in order, until a position is found where the tooltip fits
		 //		within the viewport.
		 //
		 //		Be careful setting this parameter.  A value of "above-centered" may work fine until the user scrolls
		 //		the screen so that there's no room above the target node.   Nodes with drop downs, like
		 //		DropDownButton or FilteringSelect, are especially problematic, in that you need to be sure
		 //		that the drop down and tooltip don't overlap, even when the viewport is scrolled so that there
		 //		is only room below (or above) the target node, but not both.
	 });
	=====*/
	return Tooltip;
});