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Code Issues Releases Wiki Activity

Allow themes to be switched by changing the tiddler $:/theme

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Jeremy Ruston 2013-04-30 22:57:10 +01:00
parent 6d455d77cd
commit 523d70127b
1 changed files with 62 additions and 2 deletions
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64
core/modules/themes.js
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@ -12,12 +12,72 @@ Manages themes and styling.
/*global $tw: false */
"use strict";
var THEME_PLUGIN_TITLE = "$:/theme", // This tiddler contains the title of the current theme plugin
DEFAULT_THEME_PLUGIN = "$:/themes/tiddlywiki/snowwhite";
function ThemeManager(wiki) {
this.wiki = wiki;
// Unpack the current theme tiddlers
$tw.wiki.unpackPluginTiddlers("theme");
// There's no theme to start with
this.currentThemeTitle = undefined;
// Switch to the current theme
this.switchTheme();
// Listen for changes to the theme
var self = this;
this.wiki.addEventListener("change",function(changes) {
if($tw.utils.hop(changes,THEME_PLUGIN_TITLE)) {
self.switchTheme();
}
});
}
ThemeManager.prototype.switchTheme = function() {
// Get the name of the current theme
var themePluginTitle = this.wiki.getTiddlerText(THEME_PLUGIN_TITLE,DEFAULT_THEME_PLUGIN);
// Get the theme plugin
var themePluginTiddler = this.wiki.getTiddler(themePluginTitle);
// Complain if we don't have a theme
if(!themePluginTiddler || !themePluginTiddler.isPlugin()) {
return $tw.utils.error("Cannot load theme " + themePluginTitle);
}
// Accumulate the titles of the plugins that we need to load
var themePlugins = [],
self = this,
accumulatePlugin = function(title) {
var tiddler = self.wiki.getTiddler(title);
if(tiddler && tiddler.isPlugin() && themePlugins.indexOf(title) === -1) {
themePlugins.push(title);
var pluginInfo = JSON.parse(self.wiki.getTiddlerText(title));
$tw.utils.each(pluginInfo.dependents,function(title) {
accumulatePlugin(title);
});
}
};
accumulatePlugin(themePluginTitle);
// Unregister any existing theme tiddlers
var unregisteredThemeTiddlers = $tw.wiki.unregisterPluginTiddlers("theme");
// Accumulate the titles of shadow tiddlers that have changed as a result of this switch
var changedTiddlers = {};
$tw.utils.each(this.wiki.shadowTiddlers,function(shadowInfo,title) {
if(unregisteredThemeTiddlers.indexOf(shadowInfo.source) !== -1) {
changedTiddlers[title] = true; // isDeleted?
}
});
// Register any new theme tiddlers
var registeredThemeTiddlers = $tw.wiki.registerPluginTiddlers("theme",themePlugins);
// Unpack the current theme tiddlers
$tw.wiki.unpackPluginTiddlers();
// Accumulate the affected shadow tiddlers
$tw.utils.each(this.wiki.shadowTiddlers,function(shadowInfo,title) {
if(registeredThemeTiddlers.indexOf(shadowInfo.source) !== -1) {
changedTiddlers[title] = false; // isDeleted?
}
});
// Issue change events for the modified tiddlers
$tw.utils.each(changedTiddlers,function(status,title) {
self.wiki.enqueueTiddlerEvent(title,status);
});
};
exports.ThemeManager = ThemeManager;
})();