Introduce testcase widget so that we can reuse testcases as documentation examples

There's still a bit to do: adding tabs to the source panel of the testcase display, and tweaking the CSS.

plugins/tiddlywiki/innerwiki/anchor.js

@@ -0,0 +1,17 @@
+/*\
+title: $:/plugins/tiddlywiki/innerwiki/anchor.js
+type: application/javascript
+module-type: widget
+
+Anchor widget to represent an innerwiki graphical anchor. Clone of the data widget
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+exports.anchor = require("$:/core/modules/widgets/data.js").data;
+
+})();

plugins/tiddlywiki/innerwiki/data.js

@@ -1,58 +0,0 @@
-/*\
-title: $:/plugins/tiddlywiki/innerwiki/data.js
-type: application/javascript
-module-type: widget
-
-Widget to represent a single item of data
-
-\*/
-(function(){
-
-/*jslint node: true, browser: true */
-/*global $tw: false */
-"use strict";
-
-var Widget = require("$:/core/modules/widgets/widget.js").widget;
-
-var DataWidget = function(parseTreeNode,options) {
-	this.dataWidgetTag = parseTreeNode.type;
-	this.initialise(parseTreeNode,options);
-};
-
-/*
-Inherit from the base widget class
-*/
-DataWidget.prototype = new Widget();
-
-/*
-Render this widget into the DOM
-*/
-DataWidget.prototype.render = function(parent,nextSibling) {
-	this.parentDomNode = parent;
-	this.computeAttributes();
-	this.execute();
-	this.renderChildren(parent,nextSibling);
-};
-
-/*
-Compute the internal state of the widget
-*/
-DataWidget.prototype.execute = function() {
-	// Construct the child widgets
-	this.makeChildWidgets();
-};
-
-/*
-Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
-*/
-DataWidget.prototype.refresh = function(changedTiddlers) {
-	// Refresh our attributes
-	var changedAttributes = this.computeAttributes();
-	// Refresh our children
-	return this.refreshChildren(changedTiddlers);
-};
-
-exports.data = DataWidget;
-exports.anchor = DataWidget;
-
-})();

plugins/tiddlywiki/innerwiki/innerwiki.js

@@ -15,7 +15,7 @@ Widget to display an innerwiki in an iframe
 var DEFAULT_INNERWIKI_TEMPLATE = "$:/plugins/tiddlywiki/innerwiki/template";
 
 var Widget = require("$:/core/modules/widgets/widget.js").widget,
-	DataWidget = require("$:/plugins/tiddlywiki/innerwiki/data.js").data,
+	DataWidget = require("$:/core/modules/widgets/data.js").data,
 	dm = $tw.utils.domMaker;
 
 var InnerWikiWidget = function(parseTreeNode,options) {