mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-06 10:06:19 +00:00
79 lines
2.5 KiB
JavaScript
79 lines
2.5 KiB
JavaScript
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/*\
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title: $:/core/modules/utils/styles.js
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type: application/javascript
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module-type: utils
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The stylesheet manager automatically renders any tiddlers tagged "$:/tags/stylesheet" as HTML style elements.
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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var STYLESHEET_ID_PREFIX = "tw-tiddler-stylesheet-",
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STYLESHEET_TAG = "$:/tags/stylesheet";
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function StylesheetManager(wiki) {
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this.wiki = wiki;
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this.stylesheets = {}; // Hashmap of currently rendered stylesheets
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// Apply initial stylesheets
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var self = this,
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stylesheetTiddlers = this.wiki.filterTiddlers("[is[shadow]!has[draft.of]tag[" + STYLESHEET_TAG + "]]");
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$tw.utils.each(stylesheetTiddlers,function(title,index) {
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self.addStylesheet(title);
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});
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// Listen out for changes
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this.wiki.addEventListener("change",function(changes) {
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self.handleTiddlerChanges(changes);
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});
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}
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StylesheetManager.prototype.addStylesheet = function(title) {
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// Record the stylesheet in the hashmap
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this.stylesheets[title] = true;
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// Parse the tiddler and render as plain text
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var parser = this.wiki.parseTiddler(title),
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renderTree = new $tw.WikiRenderTree(parser,{wiki: this.wiki});
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renderTree.execute({tiddlerTitle: title});
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var text = renderTree.render("text/plain");
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// Create a style element and put it in the document
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var styleNode = document.createElement("style");
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styleNode.setAttribute("type","text/css");
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styleNode.setAttribute("id",STYLESHEET_ID_PREFIX + title);
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styleNode.appendChild(document.createTextNode(text));
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document.getElementsByTagName("head")[0].appendChild(styleNode);
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};
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StylesheetManager.prototype.removeStylesheet = function(title) {
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// Remove the stylesheet from the hashmap
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if($tw.utils.hop(this.stylesheets,title)) {
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delete this.stylesheets[title];
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}
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// Remove the stylesheet from the document
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var styleNode = document.getElementById(STYLESHEET_ID_PREFIX + title);
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if(styleNode) {
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styleNode.parentNode.removeChild(styleNode);
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}
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};
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StylesheetManager.prototype.handleTiddlerChanges = function(changes) {
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var self = this;
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$tw.utils.each(changes,function(change,title) {
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// Remove any existing stylesheet for the changed tiddler
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if($tw.utils.hop(self.stylesheets,title)) {
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self.removeStylesheet(title);
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}
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// Add the stylesheet if it is tagged and not a draft
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var tiddler = self.wiki.getTiddler(title);
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if(tiddler && tiddler.hasTag(STYLESHEET_TAG) && !tiddler.hasField("draft.of")) {
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self.addStylesheet(title);
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}
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});
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};
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exports.StylesheetManager = StylesheetManager;
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})();
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