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Code Issues Releases Wiki Activity

Refactor the theme switcher to be a generic plugin switcher

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Jermolene
2014-02-08 09:29:37 +00:00
parent b26a32b93a
commit 8ad34e2db9
2 changed files with 42 additions and 32 deletions
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88
core/modules/pluginswitcher.js Normal file
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/*\
title: $:/core/modules/pluginswitcher.js
type: application/javascript
module-type: global
Manages switching plugins for themes and lingo.
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
options:
wiki: wiki store to be used
pluginType: type of plugin to be switched
controllerTitle: title of tiddler used to control switching of this resource
defaultPlugins: array of default plugins to be used if nominated plugin isn't found
*/
function PluginSwitcher(options) {
this.wiki = options.wiki;
this.pluginType = options.pluginType;
this.controllerTitle = options.controllerTitle;
this.defaultPlugins = options.defaultPlugins || [];
// Switch to the current plugin
this.switchPlugins();
// Listen for changes to the selected plugin
var self = this;
this.wiki.addEventListener("change",function(changes) {
if($tw.utils.hop(changes,self.controllerTitle)) {
self.switchPlugins();
}
});
}
PluginSwitcher.prototype.switchPlugins = function() {
// Get the name of the current theme
var selectedPluginTitle = this.wiki.getTiddlerText(this.controllerTitle);
// If it doesn't exist, then fallback to one of the default themes
var index = 0;
while(!this.wiki.getTiddler(selectedPluginTitle) && index < this.defaultPlugins.length) {
selectedPluginTitle = this.defaultPlugins[index++];
}
// Accumulate the titles of the plugins that we need to load
var plugins = [],
self = this,
accumulatePlugin = function(title) {
var tiddler = self.wiki.getTiddler(title);
if(tiddler && tiddler.isPlugin() && plugins.indexOf(title) === -1) {
plugins.push(title);
var pluginInfo = JSON.parse(self.wiki.getTiddlerText(title)),
dependents = $tw.utils.parseStringArray(tiddler.fields.dependents || "");
$tw.utils.each(dependents,function(title) {
accumulatePlugin(title);
});
}
};
accumulatePlugin(selectedPluginTitle);
// Unregister any existing theme tiddlers
var unregisteredTiddlers = $tw.wiki.unregisterPluginTiddlers(this.pluginType);
// 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(unregisteredTiddlers.indexOf(shadowInfo.source) !== -1) {
changedTiddlers[title] = true; // isDeleted?
}
});
// Register any new theme tiddlers
var registeredTiddlers = $tw.wiki.registerPluginTiddlers(this.pluginType,plugins);
// Unpack the current theme tiddlers
$tw.wiki.unpackPluginTiddlers();
// Accumulate the affected shadow tiddlers
$tw.utils.each(this.wiki.shadowTiddlers,function(shadowInfo,title) {
if(registeredTiddlers.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.PluginSwitcher = PluginSwitcher;
})();