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TiddlyWiki5/core/modules/widgets/count.js

73 lines
1.6 KiB
JavaScript

/*\
title: $:/core/modules/widgets/count.js
type: application/javascript
module-type: widget
Count widget
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var Widget = require("$:/core/modules/widgets/widget.js").widget;
var CountWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
CountWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
CountWidget.prototype.render = function(parent,nextSibling) {
this.parentDomNode = parent;
this.computeAttributes();
this.execute();
var textNode = this.document.createTextNode(this.currentCount);
parent.insertBefore(textNode,nextSibling);
this.domNodes.push(textNode);
};
/*
Compute the internal state of the widget
*/
CountWidget.prototype.execute = function() {
// Get parameters from our attributes
this.filter = this.getAttribute("filter");
// Execute the filter
if(this.filter) {
this.currentCount = this.wiki.filterTiddlers(this.filter,this).length;
} else {
this.currentCount = "0";
}
};
/*
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
*/
CountWidget.prototype.refresh = function(changedTiddlers) {
// Re-execute the filter to get the count
this.computeAttributes();
var oldCount = this.currentCount;
this.execute();
if(this.currentCount !== oldCount) {
// Regenerate and rerender the widget and replace the existing DOM node
this.refreshSelf();
return true;
} else {
return false;
}
};
exports.count = CountWidget;
})();