[libhandy/wip/exalm/animation] style-manager: Disable light/dark transtion without GtkSettings

[Alexander Mikhaylenko <alexm src gnome org>]

commit c87af19d8463b278e433e1289b5628411a6777ab
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Thu Feb 17 20:01:56 2022 +0500

    style-manager: Disable light/dark transtion without GtkSettings
    
    That approach worked but wasn't exactly great. Hence replace it with
    another approach that's not great either but is cleaner.
    
    Now a spinning spinner will keep spinning when switching between light
    and dark!

 src/hdy-style-manager.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)
---
diff --git a/src/hdy-style-manager.c b/src/hdy-style-manager.c
index 0d5a9555..34f79593 100644
--- a/src/hdy-style-manager.c
+++ b/src/hdy-style-manager.c
@@ -62,6 +62,7 @@ struct _HdyStyleManager
   HdyColorScheme color_scheme;
   gboolean dark;
 
+  GtkCssProvider *animations_provider;
   guint animation_timeout_id;
 };
 
@@ -264,8 +265,8 @@ enable_animations_cb (HdyStyleManager *self)
 {
   GdkScreen *screen = gdk_display_get_default_screen (self->display);
 
-  gtk_settings_reset_property (gtk_settings_get_for_screen (screen),
-                               "gtk-enable-animations");
+  gtk_style_context_remove_provider_for_screen (screen,
+                                                GTK_STYLE_PROVIDER (self->animations_provider));
 
   self->animation_timeout_id = 0;
 
@@ -295,7 +296,6 @@ update_stylesheet (HdyStyleManager *self)
 {
   GdkScreen *screen;
   GtkSettings *gtk_settings;
-  gboolean enable_animations;
 
   if (!self->display)
     return;
@@ -310,17 +310,12 @@ update_stylesheet (HdyStyleManager *self)
                                    G_CALLBACK (update_stylesheet),
                                    self);
 
-  if (self->animation_timeout_id) {
+  if (self->animation_timeout_id)
     g_clear_handle_id (&self->animation_timeout_id, g_source_remove);
-    enable_animations = TRUE;
-  } else {
-    g_object_get (gtk_settings,
-                  "gtk-enable-animations", &enable_animations,
-                  NULL);
-  }
 
-  if (enable_animations)
-    g_object_set (gtk_settings, "gtk-enable-animations", FALSE, NULL);
+  gtk_style_context_add_provider_for_screen (screen,
+                                             GTK_STYLE_PROVIDER (self->animations_provider),
+                                             10000);
 
   g_object_set (gtk_settings,
                 "gtk-application-prefer-dark-theme", self->dark,
@@ -340,12 +335,10 @@ update_stylesheet (HdyStyleManager *self)
                                      G_CALLBACK (warn_prefer_dark_theme),
                                      self);
 
-  if (enable_animations) {
-    self->animation_timeout_id =
-      g_timeout_add (SWITCH_DURATION,
-                     G_SOURCE_FUNC (enable_animations_cb),
-                     self);
-  }
+  self->animation_timeout_id =
+    g_timeout_add (SWITCH_DURATION,
+                   G_SOURCE_FUNC (enable_animations_cb),
+                   self);
 
   g_idle_add (G_SOURCE_FUNC (unblock_theme_name_changed_cb), self);
 }
@@ -425,6 +418,12 @@ hdy_style_manager_constructed (GObject *object)
                              G_CALLBACK (update_stylesheet),
                              self,
                              G_CONNECT_SWAPPED);
+
+    self->animations_provider = gtk_css_provider_new ();
+    gtk_css_provider_load_from_data (self->animations_provider,
+                                     "* { transition: none; }",
+                                     -1,
+                                     NULL);
   }
 
   self->settings = hdy_settings_get_default ();
@@ -450,6 +449,7 @@ hdy_style_manager_dispose (GObject *object)
   HdyStyleManager *self = HDY_STYLE_MANAGER (object);
 
   g_clear_handle_id (&self->animation_timeout_id, g_source_remove);
+  g_clear_object (&self->animations_provider);
 
   G_OBJECT_CLASS (hdy_style_manager_parent_class)->dispose (object);
 }