[gnome-shell] altTab: Only create one settings instance per window switcher popup

[Jasper St. Pierre <jstpierre src gnome org>]

commit 1edb9f7525a4bb1dd0f183267be2ba5c6bc29479
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Sep 9 16:53:44 2013 -0400

    altTab: Only create one settings instance per window switcher popup
    
    Every settings instance we create is a round-trip to the dconf
    daemon, so we need to be careful of not creating them too haphazardly.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=707806

 js/ui/altTab.js |   21 ++++++++++++---------
 1 files changed, 12 insertions(+), 9 deletions(-)
---
diff --git a/js/ui/altTab.js b/js/ui/altTab.js
index 9d47d1e..779ae7b 100644
--- a/js/ui/altTab.js
+++ b/js/ui/altTab.js
@@ -355,10 +355,13 @@ const WindowSwitcherPopup = new Lang.Class({
     Name: 'WindowSwitcherPopup',
     Extends: SwitcherPopup.SwitcherPopup,
 
+    _init: function(items) {
+        this.parent(items);
+        this._settings = new Gio.Settings({ schema: 'org.gnome.shell.window-switcher' });
+    },
+
     _getWindowList: function() {
-        let settings = new Gio.Settings({ schema: 'org.gnome.shell.window-switcher' });
-        let workspace = settings.get_boolean('current-workspace-only') ? global.screen.get_active_workspace()
-                                                                       : null;
+        let workspace = this._settings.get_boolean('current-workspace-only') ? 
global.screen.get_active_workspace() : null;
         return global.display.get_tab_list(Meta.TabList.NORMAL, global.screen, workspace);
     },
 
@@ -368,7 +371,8 @@ const WindowSwitcherPopup = new Lang.Class({
         if (windows.length == 0)
             return false;
 
-        this._switcherList = new WindowList(windows);
+        let mode = this._settings.get_enum('app-icon-mode');
+        this._switcherList = new WindowList(windows, mode);
         this._items = this._switcherList.icons;
 
         return true;
@@ -663,7 +667,7 @@ const ThumbnailList = new Lang.Class({
 const WindowIcon = new Lang.Class({
     Name: 'WindowIcon',
 
-    _init: function(window) {
+    _init: function(window, mode) {
         this.window = window;
 
         this.actor = new St.BoxLayout({ style_class: 'alt-tab-app',
@@ -681,8 +685,7 @@ const WindowIcon = new Lang.Class({
 
         this._icon.destroy_all_children();
 
-        let settings = new Gio.Settings({ schema: 'org.gnome.shell.window-switcher' });
-        switch (settings.get_enum('app-icon-mode')) {
+        switch (mode) {
             case AppIconMode.THUMBNAIL_ONLY:
                 size = WINDOW_PREVIEW_SIZE;
                 this._icon.add_actor(_createWindowClone(mutterWindow, WINDOW_PREVIEW_SIZE));
@@ -720,7 +723,7 @@ const WindowList = new Lang.Class({
     Name: 'WindowList',
     Extends: SwitcherPopup.SwitcherList,
 
-    _init : function(windows) {
+    _init : function(windows, mode) {
         this.parent(true);
 
         this._label = new St.Label({ x_align: Clutter.ActorAlign.CENTER,
@@ -732,7 +735,7 @@ const WindowList = new Lang.Class({
 
         for (let i = 0; i < windows.length; i++) {
             let win = windows[i];
-            let icon = new WindowIcon(win);
+            let icon = new WindowIcon(win, mode);
 
             this.addItem(icon.actor, icon.label);
             this.icons.push(icon);