From a3eaffa666f6cefa1449ba73b7c089384e9588dd Mon Sep 17 00:00:00 2001
From: Jeremy Ruston <jeremy@osmosoft.com>
Date: Wed, 16 Oct 2013 16:30:06 +0100
Subject: [PATCH] Add a linkcatcher widget

---
 core/modules/new_widgets/linkcatcher.js | 87 +++++++++++++++++++++++++
 core/modules/new_widgets/tempwidgets.js |  1 -
 2 files changed, 87 insertions(+), 1 deletion(-)
 create mode 100644 core/modules/new_widgets/linkcatcher.js

diff --git a/core/modules/new_widgets/linkcatcher.js b/core/modules/new_widgets/linkcatcher.js
new file mode 100644
index 000000000..f5afb1767
--- /dev/null
+++ b/core/modules/new_widgets/linkcatcher.js
@@ -0,0 +1,87 @@
+/*\
+title: $:/core/modules/new_widgets/linkcatcher.js
+type: application/javascript
+module-type: new_widget
+
+Linkcatcher widget
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var Widget = require("$:/core/modules/new_widgets/widget.js").widget;
+
+var LinkCatcherWidget = function(parseTreeNode,options) {
+	this.initialise(parseTreeNode,options);
+	this.addEventListeners([
+		{type: "tw-navigate", handler: "handleNavigateEvent"}
+	]);
+};
+
+/*
+Inherit from the base widget class
+*/
+LinkCatcherWidget.prototype = new Widget();
+
+/*
+Render this widget into the DOM
+*/
+LinkCatcherWidget.prototype.render = function(parent,nextSibling) {
+	this.parentDomNode = parent;
+	this.computeAttributes();
+	this.execute();
+	this.renderChildren(parent,nextSibling);
+};
+
+/*
+Compute the internal state of the widget
+*/
+LinkCatcherWidget.prototype.execute = function() {
+	// Get our parameters
+	this.catchTo = this.getAttribute("to");
+	this.catchMessage = this.getAttribute("message");
+	this.catchSet = this.getAttribute("set");
+	this.catchSetTo = this.getAttribute("setTo");
+	// 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
+*/
+LinkCatcherWidget.prototype.refresh = function(changedTiddlers) {
+	var changedAttributes = this.computeAttributes();
+	if(changedAttributes.to || changedAttributes.message || changedAttributes.set || changedAttributes.setTo) {
+		this.refreshSelf();
+		return true;
+	} else {
+		return this.refreshChildren(changedTiddlers);		
+	}
+};
+
+/*
+Handle a tw-navigate event
+*/
+LinkCatcherWidget.prototype.handleNavigateEvent = function(event) {
+	if(this.catchTo) {
+		this.wiki.setTextReference(this.catchTo,event.navigateTo,this.getVariable("tiddlerTitle"));
+	}
+	if(this.catchMessage) {
+		this.dispatchEvent({
+			type: this.catchMessage,
+			param: event.navigateTo
+		});
+	}
+	if(this.catchSet) {
+		var tiddler = this.wiki.getTiddler(this.catchSet);
+		this.wiki.addTiddler(new $tw.Tiddler(tiddler,{title: this.catchSet, text: this.catchSetTo}));
+	}
+	return false;
+};
+
+exports.linkcatcher = LinkCatcherWidget;
+
+})();
diff --git a/core/modules/new_widgets/tempwidgets.js b/core/modules/new_widgets/tempwidgets.js
index bdae08a62..34c5c77d9 100755
--- a/core/modules/new_widgets/tempwidgets.js
+++ b/core/modules/new_widgets/tempwidgets.js
@@ -14,7 +14,6 @@ Temporary shim widgets
 
 var Widget = require("$:/core/modules/new_widgets/widget.js").widget;
 
-exports.linkcatcher = Widget;
 exports["import"] = Widget;
 
 })();