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Code Issues Releases Wiki Activity

Refactored stylesheet implementation

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This way we reuse the refresh mechanism properly so that theme tweaks
can be applied interactively.
This commit is contained in:
Jermolene 2013-12-20 15:31:16 +00:00
parent 1491c261f5
commit 1c529ddcd4
3 changed files with 19 additions and 77 deletions
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16
core/modules/startup.js
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@ -59,8 +59,6 @@ exports.startup = function() {
});
// Install the animator
$tw.anim = new $tw.utils.Animator();
// Kick off the stylesheet manager
$tw.stylesheetManager = new $tw.utils.StylesheetManager($tw.wiki);
// Create a root widget for attaching event handlers. By using it as the parentWidget for another widget tree, one can reuse the event handlers
$tw.rootWidget = new widget.widget({
type: "widget",
@ -114,6 +112,20 @@ exports.startup = function() {
$tw.rootWidget.addEventListener("tw-clear-password",function(event) {
$tw.crypto.setPassword(null);
});
// Set up the styles
var styleTemplateTitle = "$:/core/ui/PageStylesheet",
styleParser = $tw.wiki.parseTiddler(styleTemplateTitle);
$tw.styleWidgetNode = $tw.wiki.makeWidget(styleParser,{document: $tw.document});
$tw.styleContainer = $tw.document.createElement("style");
$tw.styleWidgetNode.render($tw.styleContainer,null);
$tw.styleElement = document.createElement("style");
$tw.styleElement.innerHTML = $tw.styleContainer.textContent;
document.head.insertBefore($tw.styleElement,document.head.firstChild);
$tw.wiki.addEventListener("change",function(changes) {
if($tw.styleWidgetNode.refresh(changes,$tw.styleContainer,null)) {
$tw.styleElement.innerHTML = $tw.styleContainer.textContent;
}
});
// Display the PageMacros, which includes the PageTemplate
var templateTitle = "$:/core/ui/PageMacros",
parser = $tw.wiki.parseTiddler(templateTitle);

75
core/modules/utils/dom/styles.js
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@ -1,75 +0,0 @@
/*\
title: $:/core/modules/utils/styles.js
type: application/javascript
module-type: utils
The stylesheet manager automatically renders any tiddlers tagged "$:/tags/stylesheet" as HTML style elements.
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var STYLESHEET_ID_PREFIX = "tw-tiddler-stylesheet-",
STYLESHEET_TAG = "$:/tags/stylesheet";
function StylesheetManager(wiki) {
this.wiki = wiki;
this.stylesheets = {}; // Hashmap of currently rendered stylesheets
// Apply initial stylesheets
var self = this,
stylesheetTiddlers = this.wiki.filterTiddlers("[is[shadow]!has[draft.of]tag[" + STYLESHEET_TAG + "]] [!is[shadow]!has[draft.of]tag[" + STYLESHEET_TAG + "]]");
$tw.utils.each(stylesheetTiddlers,function(title,index) {
self.addStylesheet(title);
});
// Listen out for changes
this.wiki.addEventListener("change",function(changes) {
self.handleTiddlerChanges(changes);
});
}
StylesheetManager.prototype.addStylesheet = function(title) {
// Record the stylesheet in the hashmap
this.stylesheets[title] = true;
// Parse the tiddler and render as plain text
var text = this.wiki.renderTiddler("text/plain",title);
// Create a style element and put it in the document
var styleNode = document.createElement("style");
styleNode.setAttribute("type","text/css");
styleNode.setAttribute("id",STYLESHEET_ID_PREFIX + title);
styleNode.appendChild(document.createTextNode(text));
document.getElementsByTagName("head")[0].appendChild(styleNode);
};
StylesheetManager.prototype.removeStylesheet = function(title) {
// Remove the stylesheet from the hashmap
if($tw.utils.hop(this.stylesheets,title)) {
delete this.stylesheets[title];
}
// Remove the stylesheet from the document
var styleNode = document.getElementById(STYLESHEET_ID_PREFIX + title);
if(styleNode) {
styleNode.parentNode.removeChild(styleNode);
}
};
StylesheetManager.prototype.handleTiddlerChanges = function(changes) {
var self = this;
$tw.utils.each(changes,function(change,title) {
// Remove any existing stylesheet for the changed tiddler
if($tw.utils.hop(self.stylesheets,title)) {
self.removeStylesheet(title);
}
// Add the stylesheet if it is tagged and not a draft
var tiddler = self.wiki.getTiddler(title);
if(tiddler && tiddler.hasTag(STYLESHEET_TAG) && !tiddler.hasField("draft.of")) {
self.addStylesheet(title);
}
});
};
exports.StylesheetManager = StylesheetManager;
})();

5
core/ui/PageStylesheet.tid Normal file
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@ -0,0 +1,5 @@
title: $:/core/ui/PageStylesheet
<$list filter="[is[shadow]tag[$:/tags/stylesheet]] [!is[shadow]tag[$:/tags/stylesheet]]">
<$transclude/>
</$list>