118 lines
2.9 KiB
JavaScript
Executable File
118 lines
2.9 KiB
JavaScript
Executable File
/*\
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title: $:/core/modules/new_widgets/link.js
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type: application/javascript
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module-type: new_widget
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Link widget
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var Widget = require("$:/core/modules/new_widgets/widget.js").widget;
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var LinkWidget = function(parseTreeNode,options) {
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this.initialise(parseTreeNode,options);
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};
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/*
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Inherit from the base widget class
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*/
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LinkWidget.prototype = new Widget();
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/*
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Render this widget into the DOM
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*/
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LinkWidget.prototype.render = function(parent,nextSibling) {
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var self = this;
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// Save the parent dom node
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this.parentDomNode = parent;
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// Compute our attributes
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this.computeAttributes();
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// Execute our logic
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this.execute();
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// Create our element
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var domNode = this.document.createElement("a");
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// Assign classes
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$tw.utils.addClass(domNode,"tw-tiddlylink");
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if(this.isShadow) {
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$tw.utils.addClass(domNode,"tw-tiddlylink-shadow");
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}
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if(this.isMissing && !this.isShadow) {
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$tw.utils.addClass(domNode,"tw-tiddlylink-missing");
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} else {
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if(!this.isMissing) {
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$tw.utils.addClass(domNode,"tw-tiddlylink-resolves");
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}
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}
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// Set an href
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domNode.setAttribute("href",this.to);
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// Add a click event handler
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domNode.addEventListener("click",function (event) {
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// Send the click on it's way as a navigate event
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var bounds = domNode.getBoundingClientRect();
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self.dispatchEvent({
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type: "tw-navigate",
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navigateTo: self.to,
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navigateFromNode: self,
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navigateFromClientRect: {
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top: bounds.top,
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left: bounds.left,
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width: bounds.width,
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right: bounds.right,
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bottom: bounds.bottom,
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height: bounds.height
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}
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});
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event.preventDefault();
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event.stopPropagation();
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return false;
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},false);
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// Insert the link into the DOM and render any children
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parent.insertBefore(domNode,nextSibling);
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this.renderChildren(domNode,null);
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this.domNodes.push(domNode);
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};
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/*
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Compute the internal state of the widget
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*/
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LinkWidget.prototype.execute = function() {
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// Get the target tiddler title
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this.to = this.getAttribute("to",this.getVariable("tiddlerTitle"));
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// Determine the link characteristics
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this.isMissing = !this.wiki.tiddlerExists(this.to);
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this.isShadow = this.wiki.isShadowTiddler(this.to);
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// Make the child widgets
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this.makeChildWidgets();
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};
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/*
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Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
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*/
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LinkWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes();
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if(changedAttributes.to || changedTiddlers[this.to]) {
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this.refreshSelf();
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return true;
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}
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return this.refreshChildren(changedTiddlers);
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};
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/*
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Remove any DOM nodes created by this widget or its children
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*/
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LinkWidget.prototype.removeChildDomNodes = function() {
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$tw.utils.each(this.domNodes,function(domNode) {
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domNode.parentNode.removeChild(domNode);
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});
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this.domNodes = [];
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};
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exports.link = LinkWidget;
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})();
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