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Code Issues Releases Wiki Activity

Extend the element widget with a hook to intercept DOM node creation

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The element widget is used to render HTML elements in wikitext.
This commit is contained in:
jeremy@jermolene.com
2020-07-02 13:13:55 +01:00
parent 35a842ade6
commit bd2cf5c464
2 changed files with 63 additions and 21 deletions
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49
core/modules/widgets/element.js
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@@ -29,45 +29,47 @@ Render this widget into the DOM
ElementWidget.prototype.render = function(parent,nextSibling) {
this.parentDomNode = parent;
this.computeAttributes();
this.execute();
// Neuter blacklisted elements
var tag = this.parseTreeNode.tag;
if($tw.config.htmlUnsafeElements.indexOf(tag) !== -1) {
tag = "safe-" + tag;
this.tag = this.parseTreeNode.tag;
if($tw.config.htmlUnsafeElements.indexOf(this.tag) !== -1) {
this.tag = "safe-" + this.tag;
}
// Adjust headings by the current base level
var headingLevel = ["h1","h2","h3","h4","h5","h6"].indexOf(tag);
var headingLevel = ["h1","h2","h3","h4","h5","h6"].indexOf(this.tag);
if(headingLevel !== -1) {
var baseLevel = parseInt(this.getVariable("tv-adjust-heading-level","0"),10) || 0;
headingLevel = Math.min(Math.max(headingLevel + 1 + baseLevel,1),6);
tag = "h" + headingLevel;
this.tag = "h" + headingLevel;
}
// Create the DOM node
var domNode = this.document.createElementNS(this.namespace,tag);
this.assignAttributes(domNode,{excludeEventAttributes: true});
parent.insertBefore(domNode,nextSibling);
this.renderChildren(domNode,null);
this.domNodes.push(domNode);
};
/*
Compute the internal state of the widget
*/
ElementWidget.prototype.execute = function() {
// Select the namespace for the tag
var tagNamespaces = {
svg: "http://www.w3.org/2000/svg",
math: "http://www.w3.org/1998/Math/MathML",
body: "http://www.w3.org/1999/xhtml"
};
this.namespace = tagNamespaces[this.parseTreeNode.tag];
this.namespace = tagNamespaces[this.tag];
if(this.namespace) {
this.setVariable("namespace",this.namespace);
} else {
this.namespace = this.getVariable("namespace",{defaultValue: "http://www.w3.org/1999/xhtml"});
}
// Invoke the th-rendering-element hook
var parseTreeNodes = $tw.hooks.invokeHook("th-rendering-element",null,this);
this.isReplaced = !!parseTreeNodes;
if(parseTreeNodes) {
// Use the parse tree nodes provided by the hook
this.makeChildWidgets(parseTreeNodes);
this.renderChildren(this.parentDomNode,null);
return;
}
// Make the child widgets
this.makeChildWidgets();
// Create the DOM node and render children
var domNode = this.document.createElementNS(this.namespace,this.tag);
this.assignAttributes(domNode,{excludeEventAttributes: true});
parent.insertBefore(domNode,nextSibling);
this.renderChildren(domNode,null);
this.domNodes.push(domNode);
};
/*
@@ -77,8 +79,13 @@ ElementWidget.prototype.refresh = function(changedTiddlers) {
var changedAttributes = this.computeAttributes(),
hasChangedAttributes = $tw.utils.count(changedAttributes) > 0;
if(hasChangedAttributes) {
// Update our attributes
this.assignAttributes(this.domNodes[0],{excludeEventAttributes: true});
if(!this.isReplaced) {
// Update our attributes
this.assignAttributes(this.domNodes[0],{excludeEventAttributes: true});
} else {
// If we were replaced then completely refresh ourselves
return this.refreshSelf();
}
}
return this.refreshChildren(changedTiddlers) || hasChangedAttributes;
};