[gnome-calendar] application: Move CSS providers to GcalWindow

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8f715c19b58d3e87a205689ec274dfbaa21c5d5e
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sun Sep 5 18:34:32 2021 -0300

    application: Move CSS providers to GcalWindow

 src/gui/gcal-application.c | 89 --------------------------------------------
 src/gui/gcal-window.c      | 92 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+), 89 deletions(-)
---
diff --git a/src/gui/gcal-application.c b/src/gui/gcal-application.c
index a6f33389..a541bb4b 100644
--- a/src/gui/gcal-application.c
+++ b/src/gui/gcal-application.c
@@ -21,7 +21,6 @@
 
 #include "config.h"
 
-#include "css-code.h"
 #include "gcal-application.h"
 #include "gcal-context.h"
 #include "gcal-debug.h"
@@ -41,9 +40,6 @@ struct _GcalApplication
 
   GtkWidget          *window;
 
-  GtkCssProvider     *provider;
-  GtkCssProvider     *colors_provider;
-
   gchar              *uuid;
   GDateTime          *initial_date;
 
@@ -95,73 +91,6 @@ enum
 
 static GParamSpec* properties[N_PROPS] = { NULL, };
 
-static void
-process_sources (GcalApplication *self)
-{
-  g_autoptr (GError) error = NULL;
-  g_autofree gchar *new_css_data = NULL;
-  g_auto (GStrv) new_css_snippets = NULL;
-  GcalManager *manager;
-  GList *calendars, *l;
-  GQuark color_id;
-  gint arr_length;
-  gint i = 0;
-
-  manager = gcal_context_get_manager (self->context);
-  calendars = gcal_manager_get_calendars (manager);
-  arr_length = g_list_length (calendars);
-  new_css_snippets = g_new0 (gchar*, arr_length + 2);
-  for (l = calendars; l; l = l->next, i++)
-    {
-      g_autofree gchar* color_str = NULL;
-      const GdkRGBA *color;
-      GcalCalendar *calendar;
-
-      calendar = GCAL_CALENDAR (l->data);
-
-      color = gcal_calendar_get_color (calendar);
-      color_str = gdk_rgba_to_string (color);
-      color_id = g_quark_from_string (color_str);
-
-      new_css_snippets[i] = g_strdup_printf (CSS_TEMPLATE, color_id, color_str);
-    }
-
-  g_list_free (calendars);
-
-  new_css_data = g_strjoinv ("\n", new_css_snippets);
-
-  gtk_css_provider_load_from_data (self->colors_provider, new_css_data, -1, &error);
-
-  if (error)
-    g_warning ("Error creating custom stylesheet. %s", error->message);
-}
-
-static void
-load_css_provider (GcalApplication *self)
-{
-  g_autoptr (GFile) css_file = NULL;
-  g_autofree gchar *theme_name = NULL;
-  g_autofree gchar *theme_uri = NULL;
-
-  /* Apply the CSS provider */
-  self->provider = gtk_css_provider_new ();
-  gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
-                                             GTK_STYLE_PROVIDER (self->provider),
-                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION + 1);
-
-  /* Retrieve the theme name */
-  g_object_get (gtk_settings_get_default (), "gtk-theme-name", &theme_name, NULL);
-  theme_uri = g_strconcat ("resource:///org/gnome/calendar/theme/", theme_name, ".css", NULL);
-
-  /* Try and load the CSS file */
-  css_file = g_file_new_for_uri (theme_uri);
-
-  if (g_file_query_exists (css_file, NULL))
-    gtk_css_provider_load_from_file (self->provider, css_file, NULL);
-  else
-    gtk_css_provider_load_from_resource (self->provider, "/org/gnome/calendar/theme/Adwaita.css");
-}
-
 /*
  * Callbacks
  */
@@ -324,8 +253,6 @@ gcal_application_finalize (GObject *object)
   gcal_clear_date_time (&self->initial_date);
   g_clear_pointer (&self->uuid, g_free);
   g_clear_object (&self->context);
-  g_clear_object (&self->colors_provider);
-  g_clear_object (&self->provider);
   g_clear_object (&self->search_provider);
 
   G_OBJECT_CLASS (gcal_application_parent_class)->finalize (object);
@@ -435,14 +362,6 @@ gcal_application_startup (GApplication *app)
   /*  initialize libhandy */
   hdy_init();
 
-  /* CSS */
-  load_css_provider (self);
-
-  self->colors_provider = gtk_css_provider_new ();
-  gtk_style_context_add_provider_for_screen (gdk_screen_get_default (),
-                                             GTK_STYLE_PROVIDER (self->colors_provider),
-                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION + 2);
-
   /* Startup the manager */
   gcal_context_startup (self->context);
 
@@ -660,17 +579,9 @@ gcal_application_class_init (GcalApplicationClass *klass)
 static void
 gcal_application_init (GcalApplication *self)
 {
-  GcalManager *manager;
-
   g_application_add_main_option_entries (G_APPLICATION (self), gcal_application_goptions);
 
   self->context = gcal_context_new ();
-
-  manager = gcal_context_get_manager (self->context);
-  g_signal_connect_swapped (manager, "calendar-added", G_CALLBACK (process_sources), self);
-  g_signal_connect_swapped (manager, "calendar-changed", G_CALLBACK (process_sources), self);
-  g_signal_connect_swapped (manager, "calendar-removed", G_CALLBACK (process_sources), self);
-
   self->search_provider = gcal_shell_search_provider_new (self->context);
 }
 
diff --git a/src/gui/gcal-window.c b/src/gui/gcal-window.c
index 5b233530..75e937ab 100644
--- a/src/gui/gcal-window.c
+++ b/src/gui/gcal-window.c
@@ -19,6 +19,7 @@
 
 #define G_LOG_DOMAIN "GcalWindow"
 
+#include "css-code.h"
 #include "gcal-calendar-management-dialog.h"
 #include "gcal-calendar-popover.h"
 #include "config.h"
@@ -159,6 +160,10 @@ struct _GcalWindow
   /* handler for the searh_view */
   gint                click_outside_handler_id;
 
+  /* CSS */
+  GtkCssProvider     *provider;
+  GtkCssProvider     *colors_provider;
+
   /* Window states */
   gint                width;
   gint                height;
@@ -316,6 +321,80 @@ save_geometry (GcalWindow *self)
   GCAL_EXIT;
 }
 
+static void
+recalculate_calendar_colors_css (GcalWindow *self)
+{
+  g_autoptr (GError) error = NULL;
+  g_autoptr (GList) calendars = NULL;
+  g_autofree gchar *new_css_data = NULL;
+  g_auto (GStrv) new_css_snippets = NULL;
+  GcalManager *manager;
+  GQuark color_id;
+  GList *l;
+  gint arr_length;
+  gint i = 0;
+
+  manager = gcal_context_get_manager (self->context);
+  calendars = gcal_manager_get_calendars (manager);
+  arr_length = g_list_length (calendars);
+  new_css_snippets = g_new0 (gchar*, arr_length + 2);
+  for (l = calendars; l; l = l->next, i++)
+    {
+      g_autofree gchar* color_str = NULL;
+      const GdkRGBA *color;
+      GcalCalendar *calendar;
+
+      calendar = GCAL_CALENDAR (l->data);
+
+      color = gcal_calendar_get_color (calendar);
+      color_str = gdk_rgba_to_string (color);
+      color_id = g_quark_from_string (color_str);
+
+      new_css_snippets[i] = g_strdup_printf (CSS_TEMPLATE, color_id, color_str);
+    }
+
+  new_css_data = g_strjoinv ("\n", new_css_snippets);
+  gtk_css_provider_load_from_data (self->colors_provider, new_css_data, -1, &error);
+
+  if (error)
+    g_warning ("Error creating custom stylesheet. %s", error->message);
+}
+
+static void
+load_css_providers (GcalWindow *self)
+{
+  g_autoptr (GFile) css_file = NULL;
+  g_autofree gchar *theme_name = NULL;
+  g_autofree gchar *theme_uri = NULL;
+  GdkScreen *screen;
+
+  screen = gtk_widget_get_screen (GTK_WIDGET (self));
+
+  /* Theme */
+  self->provider = gtk_css_provider_new ();
+  gtk_style_context_add_provider_for_screen (screen,
+                                             GTK_STYLE_PROVIDER (self->provider),
+                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION + 1);
+
+  /* Retrieve the theme name */
+  g_object_get (gtk_settings_get_default (), "gtk-theme-name", &theme_name, NULL);
+  theme_uri = g_strconcat ("resource:///org/gnome/calendar/theme/", theme_name, ".css", NULL);
+
+  /* Try and load the CSS file */
+  css_file = g_file_new_for_uri (theme_uri);
+
+  if (g_file_query_exists (css_file, NULL))
+    gtk_css_provider_load_from_file (self->provider, css_file, NULL);
+  else
+    gtk_css_provider_load_from_resource (self->provider, "/org/gnome/calendar/theme/Adwaita.css");
+
+  /* Calendar olors */
+  self->colors_provider = gtk_css_provider_new ();
+  gtk_style_context_add_provider_for_screen (screen,
+                                             GTK_STYLE_PROVIDER (self->colors_provider),
+                                             GTK_STYLE_PROVIDER_PRIORITY_APPLICATION + 2);
+}
+
 
 /*
  * Callbacks
@@ -817,6 +896,9 @@ gcal_window_finalize (GObject *object)
 
   gcal_clear_date_time (&window->active_date);
 
+  g_clear_object (&window->colors_provider);
+  g_clear_object (&window->provider);
+
   G_OBJECT_CLASS (gcal_window_parent_class)->finalize (object);
 
   GCAL_EXIT;
@@ -850,6 +932,16 @@ gcal_window_constructed (GObject *object)
   g_object_bind_property (self, "context", self->quick_add_popover, "context", G_BINDING_DEFAULT | 
G_BINDING_SYNC_CREATE);
   g_object_bind_property (self, "context", self->search_button, "context", G_BINDING_DEFAULT | 
G_BINDING_SYNC_CREATE);
 
+  /* CSS */
+  load_css_providers (self);
+
+  g_object_connect (gcal_context_get_manager (self->context),
+                    "swapped-object-signal::calendar-added", recalculate_calendar_colors_css, self,
+                    "swapped-object-signal::calendar-changed", recalculate_calendar_colors_css, self,
+                    "swapped-object-signal::calendar-removed", recalculate_calendar_colors_css, self,
+                    NULL);
+  recalculate_calendar_colors_css (self);
+
   GCAL_EXIT;
 }