mirror of
https://github.com/Jermolene/TiddlyWiki5
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152fb798eb
This mechanism will only be triggered by changes to the stylesheet tiddlers themselves, and not to any dependencies that they might have. It'll stay that way for a while. The next thing is making the theme manager actually switch themes, forcing the right wiki change events to make the stylesheet manager update itself
79 lines
2.5 KiB
JavaScript
79 lines
2.5 KiB
JavaScript
/*\
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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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