[gnome-shell/wip/carlosg/cleanup-gtk-usage: 5/7] st-texture-cache: Use GtkIconTheme separate from GTK+

[Carlos Garnacho <carlosg src gnome org>]

commit 036e67049b9a377ba070e37c38a33850b4ca10cb
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Nov 27 22:07:25 2018 +0100

    st-texture-cache: Use GtkIconTheme separate from GTK+
    
    Using the default icon theme just has automatic theme updates as an added
    value. We can do that ourselves, and stop relying on XSettings internally.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/317

 js/ui/main.js             |  2 --
 src/st/st-texture-cache.c | 31 +++++++++++++++++++++----------
 2 files changed, 21 insertions(+), 12 deletions(-)
---
diff --git a/js/ui/main.js b/js/ui/main.js
index e827eb9c5..ccecb49d4 100644
--- a/js/ui/main.js
+++ b/js/ui/main.js
@@ -3,7 +3,6 @@
 const Clutter = imports.gi.Clutter;
 const Gio = imports.gi.Gio;
 const GLib = imports.gi.GLib;
-const Gtk = imports.gi.Gtk;
 const Mainloop = imports.mainloop;
 const Meta = imports.gi.Meta;
 const Shell = imports.gi.Shell;
@@ -129,7 +128,6 @@ function start() {
     sessionMode.connect('updated', _sessionUpdated);
 
     St.Settings.get().connect('notify::gtk-theme', _loadDefaultStylesheet);
-    Gtk.IconTheme.get_default().add_resource_path('/org/gnome/shell/theme/icons');
     _initializeUI();
 
     shellAccessDialogDBusService = new AccessDialog.AccessDialogDBus();
diff --git a/src/st/st-texture-cache.c b/src/st/st-texture-cache.c
index d9c0a9673..1d11ce71c 100644
--- a/src/st/st-texture-cache.c
+++ b/src/st/st-texture-cache.c
@@ -23,6 +23,7 @@
 
 #include "st-texture-cache.h"
 #include "st-private.h"
+#include "st-settings.h"
 #include <gtk/gtk.h>
 #include <string.h>
 #include <glib.h>
@@ -34,6 +35,7 @@
 struct _StTextureCachePrivate
 {
   GtkIconTheme *icon_theme;
+  GSettings *settings;
 
   /* Things that were loaded with a cache policy != NONE */
   GHashTable *keyed_cache; /* char * -> ClutterImage* */
@@ -131,20 +133,33 @@ st_texture_cache_evict_icons (StTextureCache *cache)
 }
 
 static void
-on_icon_theme_changed (GtkIconTheme   *icon_theme,
+on_icon_theme_changed (StSettings     *settings,
+                       GParamSpec     *pspec,
                        StTextureCache *cache)
 {
+  g_autofree gchar *theme;
+
   st_texture_cache_evict_icons (cache);
+
+  g_object_get (settings, "gtk-icon-theme", &theme, NULL);
+  gtk_icon_theme_set_custom_theme (cache->priv->icon_theme, theme);
+
   g_signal_emit (cache, signals[ICON_THEME_CHANGED], 0);
 }
 
 static void
 st_texture_cache_init (StTextureCache *self)
 {
+  StSettings *settings;
+
   self->priv = g_new0 (StTextureCachePrivate, 1);
 
-  self->priv->icon_theme = gtk_icon_theme_get_default ();
-  g_signal_connect (self->priv->icon_theme, "changed",
+  self->priv->icon_theme = gtk_icon_theme_new ();
+  gtk_icon_theme_add_resource_path (self->priv->icon_theme,
+                                    "/org/gnome/shell/theme/icons");
+
+  settings = st_settings_get ();
+  g_signal_connect (settings, "notify::gtk-icon-theme",
                     G_CALLBACK (on_icon_theme_changed), self);
 
   self->priv->keyed_cache = g_hash_table_new_full (g_str_hash, g_str_equal,
@@ -158,6 +173,7 @@ st_texture_cache_init (StTextureCache *self)
   self->priv->file_monitors = g_hash_table_new_full (g_file_hash, (GEqualFunc) g_file_equal,
                                                      g_object_unref, g_object_unref);
 
+  on_icon_theme_changed (settings, NULL, self);
 }
 
 static void
@@ -165,13 +181,8 @@ st_texture_cache_dispose (GObject *object)
 {
   StTextureCache *self = (StTextureCache*)object;
 
-  if (self->priv->icon_theme)
-    {
-      g_signal_handlers_disconnect_by_func (self->priv->icon_theme,
-                                            (gpointer) on_icon_theme_changed,
-                                            self);
-      self->priv->icon_theme = NULL;
-    }
+  g_clear_object (&self->priv->settings);
+  g_clear_object (&self->priv->icon_theme);
 
   g_clear_pointer (&self->priv->keyed_cache, g_hash_table_destroy);
   g_clear_pointer (&self->priv->keyed_surface_cache, g_hash_table_destroy);