From: Jasper St. Pierre <jstpierre@mecheye.net>
Date: Mon, 4 Jun 2012 21:14:18 +0000 (-0400)
Subject: extensionUtils: Use signals rather than callbacks for finding extensions
X-Git-Tag: archive/raspbian/50.5-1+rpi1~1^2~1013^2^2~6483
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=498b023989000f277529ad5f4e3193844be87dd6;p=gnome-shell.git

extensionUtils: Use signals rather than callbacks for finding extensions

This allows us to move to a file-monitor based approach in the future.

Since we need signals, we convert the current set of functions to an
object we attach signals too, leading to the new ExtensionFinder object.

https://bugzilla.gnome.org/show_bug.cgi?id=677586
---

diff --git a/js/extensionPrefs/main.js b/js/extensionPrefs/main.js
index a403cdb7f..90fd9abc6 100644
--- a/js/extensionPrefs/main.js
+++ b/js/extensionPrefs/main.js
@@ -202,24 +202,29 @@ const Application = new Lang.Class({
     },
 
     _scanExtensions: function() {
-        ExtensionUtils.scanExtensions(Lang.bind(this, function(uuid, dir, type) {
-            if (ExtensionUtils.extensions[uuid] !== undefined)
-                return;
-
-            let extension;
-            try {
-                extension = ExtensionUtils.createExtensionObject(uuid, dir, type);
-            } catch(e) {
-                logError(e, 'Could not create extensions object');
-                return;
-            }
-
-            let iter = this._model.append();
-            this._model.set(iter, [0, 1], [uuid, extension.metadata.name]);
-            this._extensionIters[uuid] = iter;
-        }));
+        let finder = new ExtensionUtils.ExtensionFinder();
+        finder.connect('extension-found', Lang.bind(this, this._extensionFound));
+        finder.scanExtensions();
     },
 
+    _extensionFound: function(signals, uuid, dir, type) {
+        if (ExtensionUtils.extensions[uuid] !== undefined)
+            return;
+
+        let extension;
+        try {
+            extension = ExtensionUtils.createExtensionObject(uuid, dir, type);
+        } catch(e) {
+            logError(e, 'Could not create extensions object');
+            return;
+        }
+
+        let iter = this._model.append();
+        this._model.set(iter, [0, 1], [uuid, extension.metadata.name]);
+        this._extensionIters[uuid] = iter;
+    },
+
+
     _onActivate: function() {
         this._window.present();
     },
diff --git a/js/misc/extensionUtils.js b/js/misc/extensionUtils.js
index d08648413..3eaa1b9e4 100644
--- a/js/misc/extensionUtils.js
+++ b/js/misc/extensionUtils.js
@@ -3,6 +3,9 @@
 // Common utils for the extension system and the extension
 // preferences tool
 
+const Lang = imports.lang;
+const Signals = imports.signals;
+
 const GLib = imports.gi.GLib;
 const Gio = imports.gi.Gio;
 const ShellJS = imports.gi.ShellJS;
@@ -149,36 +152,41 @@ function installImporter(extension) {
     _extension = null;
 }
 
-function scanExtensionsInDirectory(callback, dir, type) {
-    let fileEnum;
-    let file, info;
-    try {
-        fileEnum = dir.enumerate_children('standard::*', Gio.FileQueryInfoFlags.NONE, null);
-    } catch(e) {
-        logError(e, 'Could not enumerate extensions directory');
-        return;
-    }
-
-    while ((info = fileEnum.next_file(null)) != null) {
-        let fileType = info.get_file_type();
-        if (fileType != Gio.FileType.DIRECTORY)
-            continue;
-        let uuid = info.get_name();
-        let extensionDir = dir.get_child(uuid);
-        callback(uuid, extensionDir, type);
-    }
-    fileEnum.close(null);
-}
-
-function scanExtensions(callback) {
-    let userExtensionsDir = Gio.File.new_for_path(GLib.build_filenamev([global.userdatadir, 'extensions']));
-    scanExtensionsInDirectory(callback, userExtensionsDir, ExtensionType.PER_USER);
+const ExtensionFinder = new Lang.Class({
+    Name: 'ExtensionFinder',
+
+    _scanExtensionsInDirectory: function(dir, type) {
+        let fileEnum;
+        let file, info;
+        try {
+            fileEnum = dir.enumerate_children('standard::*', Gio.FileQueryInfoFlags.NONE, null);
+        } catch(e) {
+            logError(e, 'Could not enumerate extensions directory');
+            return;
+        }
 
-    let systemDataDirs = GLib.get_system_data_dirs();
-    for (let i = 0; i < systemDataDirs.length; i++) {
-        let dirPath = GLib.build_filenamev([systemDataDirs[i], 'gnome-shell', 'extensions']);
-        let dir = Gio.file_new_for_path(dirPath);
-        if (dir.query_exists(null))
-            scanExtensionsInDirectory(callback, dir, ExtensionType.SYSTEM);
+        while ((info = fileEnum.next_file(null)) != null) {
+            let fileType = info.get_file_type();
+            if (fileType != Gio.FileType.DIRECTORY)
+                continue;
+            let uuid = info.get_name();
+            let extensionDir = dir.get_child(uuid);
+            this.emit('extension-found', uuid, extensionDir, type);
+        }
+        fileEnum.close(null);
+    },
+
+    scanExtensions: function() {
+        let userExtensionsDir = Gio.File.new_for_path(GLib.build_filenamev([global.userdatadir, 'extensions']));
+        this._scanExtensionsInDirectory(userExtensionsDir, ExtensionType.PER_USER);
+
+        let systemDataDirs = GLib.get_system_data_dirs();
+        for (let i = 0; i < systemDataDirs.length; i++) {
+            let dirPath = GLib.build_filenamev([systemDataDirs[i], 'gnome-shell', 'extensions']);
+            let dir = Gio.file_new_for_path(dirPath);
+            if (dir.query_exists(null))
+                this._scanExtensionsInDirectory(dir, ExtensionType.SYSTEM);
+        }
     }
-}
+});
+Signals.addSignalMethods(ExtensionFinder.prototype);
diff --git a/js/ui/extensionSystem.js b/js/ui/extensionSystem.js
index efb9144ea..902ecb691 100644
--- a/js/ui/extensionSystem.js
+++ b/js/ui/extensionSystem.js
@@ -262,8 +262,10 @@ function init() {
 }
 
 function loadExtensions() {
-    ExtensionUtils.scanExtensions(function(uuid, dir, type) {
+    let finder = new ExtensionUtils.ExtensionFinder();
+    finder.connect('extension-found', function(signals, uuid, dir, type) {
         let enabled = enabledExtensions.indexOf(uuid) != -1;
         loadExtension(dir, type, enabled);
     });
+    finder.scanExtensions();
 }