diff --git a/core/modules/new_widgets/count.js b/core/modules/new_widgets/count.js new file mode 100644 index 000000000..3385a3d9e --- /dev/null +++ b/core/modules/new_widgets/count.js @@ -0,0 +1,81 @@ +/*\ +title: $:/core/modules/new_widgets/count.js +type: application/javascript +module-type: new_widget + +Count widget + +\*/ +(function(){ + +/*jslint node: true, browser: true */ +/*global $tw: false */ +"use strict"; + +var Widget = require("$:/core/modules/new_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.getVariable("tiddlerTitle")).length; + } else { + this.currentCount = undefined; + } +}; + +/* +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 + 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; + } + +}; + +/* +Remove any DOM nodes created by this widget +*/ +CountWidget.prototype.removeChildDomNodes = function() { + $tw.utils.each(this.domNodes,function(domNode) { + domNode.parentNode.removeChild(domNode); + }); + this.domNodes = []; +}; + +exports.count = CountWidget; + +})();