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TiddlyWiki5/core/modules/widgets/importvariables.js

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/*\
title: $:/core/modules/widgets/importvariables.js
type: application/javascript
module-type: widget
Import variable definitions from other tiddlers
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var Widget = require("$:/core/modules/widgets/widget.js").widget;
var ImportVariablesWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
ImportVariablesWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
ImportVariablesWidget.prototype.render = function(parent,nextSibling) {
this.parentDomNode = parent;
this.computeAttributes();
this.execute();
this.renderChildren(parent,nextSibling);
};
/*
Compute the internal state of the widget
*/
ImportVariablesWidget.prototype.execute = function(tiddlerList) {
var self = this;
// Get our parameters
this.filter = this.getAttribute("filter");
// Compute the filter
this.tiddlerList = tiddlerList || this.wiki.filterTiddlers(this.filter,this);
// Accumulate the <$set> widgets from each tiddler
var widgetStackStart,widgetStackEnd;
function addWidgetNode(widgetNode) {
if(widgetNode) {
if(!widgetStackStart && !widgetStackEnd) {
widgetStackStart = widgetNode;
widgetStackEnd = widgetNode;
} else {
widgetStackEnd.children = [widgetNode];
widgetStackEnd = widgetNode;
}
}
}
$tw.utils.each(this.tiddlerList,function(title) {
var parser = self.wiki.parseTiddler(title);
if(parser) {
var parseTreeNode = parser.tree[0];
while(parseTreeNode && parseTreeNode.type === "set") {
addWidgetNode({
type: "set",
attributes: parseTreeNode.attributes,
params: parseTreeNode.params
});
parseTreeNode = parseTreeNode.children[0];
}
}
});
// Add our own children to the end of the pile
var parseTreeNodes;
if(widgetStackStart && widgetStackEnd) {
parseTreeNodes = [widgetStackStart];
widgetStackEnd.children = this.parseTreeNode.children;
} else {
parseTreeNodes = this.parseTreeNode.children;
}
// Construct the child widgets
this.makeChildWidgets(parseTreeNodes);
};
/*
Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
*/
ImportVariablesWidget.prototype.refresh = function(changedTiddlers) {
// Recompute our attributes and the filter list
var changedAttributes = this.computeAttributes(),
tiddlerList = this.wiki.filterTiddlers(this.getAttribute("filter"),this);
// Refresh if the filter has changed, or the list of tiddlers has changed, or any of the tiddlers in the list has changed
function haveListedTiddlersChanged() {
var changed = false;
tiddlerList.forEach(function(title) {
if(changedTiddlers[title]) {
changed = true;
}
});
return changed;
}
if(changedAttributes.filter || !$tw.utils.isArrayEqual(this.tiddlerList,tiddlerList) || haveListedTiddlersChanged()) {
// Compute the filter
this.removeChildDomNodes();
this.execute(tiddlerList);
this.renderChildren(this.parentDomNode,this.findNextSiblingDomNode());
return true;
} else {
return this.refreshChildren(changedTiddlers);
}
};
exports.importvariables = ImportVariablesWidget;
})();