106 lines
3.1 KiB
JavaScript
Executable File
106 lines
3.1 KiB
JavaScript
Executable File
/*\
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title: $:/core/modules/widgets/element.js
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type: application/javascript
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module-type: widget
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Element 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/widgets/widget.js").widget;
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var ElementWidget = 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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ElementWidget.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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ElementWidget.prototype.render = function(parent,nextSibling) {
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this.parentDomNode = parent;
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this.computeAttributes();
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// Neuter blacklisted elements
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this.tag = this.parseTreeNode.tag;
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if($tw.config.htmlUnsafeElements.indexOf(this.tag) !== -1) {
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this.tag = "safe-" + this.tag;
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}
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// Restrict tag name to digits, letts and dashes
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this.tag = this.tag.replace(/[^0-9a-zA-Z\-]/mg,"");
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// Default to a span
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this.tag = this.tag || "span";
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// Adjust headings by the current base level
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var headingLevel = ["h1","h2","h3","h4","h5","h6"].indexOf(this.tag);
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if(headingLevel !== -1) {
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var baseLevel = parseInt(this.getVariable("tv-adjust-heading-level","0"),10) || 0;
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headingLevel = Math.min(Math.max(headingLevel + 1 + baseLevel,1),6);
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this.tag = "h" + headingLevel;
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}
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// Select the namespace for the tag
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var XHTML_NAMESPACE = "http://www.w3.org/1999/xhtml",
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tagNamespaces = {
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svg: "http://www.w3.org/2000/svg",
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math: "http://www.w3.org/1998/Math/MathML",
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body: XHTML_NAMESPACE
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};
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this.namespace = tagNamespaces[this.tag];
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if(this.namespace) {
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this.setVariable("namespace",this.namespace);
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} else {
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if(this.hasAttribute("xmlns")) {
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this.namespace = this.getAttribute("xmlns");
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this.setVariable("namespace",this.namespace);
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} else {
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this.namespace = this.getVariable("namespace",{defaultValue: XHTML_NAMESPACE});
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}
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}
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// Invoke the th-rendering-element hook
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var parseTreeNodes = $tw.hooks.invokeHook("th-rendering-element",null,this);
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this.isReplaced = !!parseTreeNodes;
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if(parseTreeNodes) {
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// Use the parse tree nodes provided by the hook
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this.makeChildWidgets(parseTreeNodes);
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this.renderChildren(this.parentDomNode,null);
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return;
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}
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// Make the child widgets
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this.makeChildWidgets();
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// Create the DOM node and render children
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var domNode = this.document.createElementNS(this.namespace,this.tag);
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this.assignAttributes(domNode,{excludeEventAttributes: true});
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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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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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ElementWidget.prototype.refresh = function(changedTiddlers) {
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var changedAttributes = this.computeAttributes(),
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hasChangedAttributes = $tw.utils.count(changedAttributes) > 0;
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if(hasChangedAttributes) {
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if(!this.isReplaced) {
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// Update our attributes
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this.assignAttributes(this.domNodes[0],{excludeEventAttributes: true});
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} else {
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// If we were replaced then completely refresh ourselves
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return this.refreshSelf();
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}
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}
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return this.refreshChildren(changedTiddlers) || hasChangedAttributes;
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};
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exports.element = ElementWidget;
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})();
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