[gnome-builder/wip/gtk4-port: 255/343] libide/gui: recolor UI based on selected style scheme

[Christian Hergert <chergert src gnome org>]

commit 50abee21e04e0db0998eacdc9f9b1b9379190a6f
Author: Christian Hergert <chergert redhat com>
Date:   Thu Mar 31 04:14:14 2022 -0700

    libide/gui: recolor UI based on selected style scheme

 src/libide/gui/ide-application-color.c   | 44 ++++++++++++++++++++++++++++++++
 src/libide/gui/ide-application-private.h |  4 +++
 src/libide/gui/ide-application.c         |  4 +++
 3 files changed, 52 insertions(+)
---
diff --git a/src/libide/gui/ide-application-color.c b/src/libide/gui/ide-application-color.c
index 0f42e698a..94161065e 100644
--- a/src/libide/gui/ide-application-color.c
+++ b/src/libide/gui/ide-application-color.c
@@ -26,6 +26,7 @@
 
 #include "ide-application.h"
 #include "ide-application-private.h"
+#include "ide-recoloring-private.h"
 
 static void
 add_style_name (GPtrArray   *ar,
@@ -130,6 +131,8 @@ _ide_application_update_style_scheme (IdeApplication *self)
   g_autofree gchar *old_name = NULL;
   g_autofree gchar *new_name = NULL;
 
+  g_assert (IDE_IS_APPLICATION (self));
+
   manager = adw_style_manager_get_default ();
 
   /*
@@ -150,9 +153,38 @@ _ide_application_update_style_scheme (IdeApplication *self)
     g_settings_set_string (editor_settings, "style-scheme-name", new_name);
 }
 
+static void
+ide_application_color_style_scheme_changed_cb (IdeApplication *self,
+                                               const char     *key,
+                                               GSettings      *editor_settings)
+{
+  GtkSourceStyleSchemeManager *manager;
+  GtkSourceStyleScheme *scheme;
+  g_autofree char *style_scheme_name = NULL;
+  g_autofree char *css = NULL;
+
+  g_assert (IDE_IS_APPLICATION (self));
+  g_assert (g_strcmp0 (key, "style-scheme-name") == 0);
+  g_assert (G_IS_SETTINGS (editor_settings));
+
+  style_scheme_name = g_settings_get_string (editor_settings, key);
+  g_debug ("Style scheme changed to %s", style_scheme_name);
+
+  manager = gtk_source_style_scheme_manager_get_default ();
+  scheme = gtk_source_style_scheme_manager_get_scheme (manager, style_scheme_name);
+
+  if (scheme == NULL)
+    return;
+
+  if ((css = _ide_recoloring_generate_css (scheme)))
+    gtk_css_provider_load_from_data (self->recoloring, css, -1);
+}
+
 void
 _ide_application_init_color (IdeApplication *self)
 {
+  g_autofree char *style_scheme_name = NULL;
+
   g_return_if_fail (IDE_IS_APPLICATION (self));
   g_return_if_fail (G_IS_SETTINGS (self->settings));
 
@@ -176,6 +208,18 @@ _ide_application_init_color (IdeApplication *self)
                                G_CONNECT_SWAPPED);
     }
 
+  style_scheme_name = g_settings_get_string (self->editor_settings, "style-scheme-name");
+  g_debug ("Initialized with style scheme %s", style_scheme_name);
+  g_signal_connect_object (self->editor_settings,
+                           "changed::style-scheme-name",
+                           G_CALLBACK (ide_application_color_style_scheme_changed_cb),
+                           self,
+                           G_CONNECT_SWAPPED);
+  gtk_style_context_add_provider_for_display (gdk_display_get_default (),
+                                              GTK_STYLE_PROVIDER (self->recoloring),
+                                              GTK_STYLE_PROVIDER_PRIORITY_THEME+1);
+
   _ide_application_update_color (self);
   _ide_application_update_style_scheme (self);
+  ide_application_color_style_scheme_changed_cb (self, "style-scheme-name", self->editor_settings);
 }
diff --git a/src/libide/gui/ide-application-private.h b/src/libide/gui/ide-application-private.h
index 94f478254..eca37f886 100644
--- a/src/libide/gui/ide-application-private.h
+++ b/src/libide/gui/ide-application-private.h
@@ -59,6 +59,7 @@ struct _IdeApplication
    * for various keys.
    */
   GSettings *settings;
+  GSettings *editor_settings;
 
   /* We need to track the GResource files that were manually loaded for
    * plugins on disk (generally Python plugins that need resources). That
@@ -71,6 +72,9 @@ struct _IdeApplication
    */
   GHashTable *css_providers;
 
+  /* The CSS provider to recolor all of the widgetry based on style schemes */
+  GtkCssProvider *recoloring;
+
   /* We need to stash the unmodified argv for the application somewhere
    * so that we can pass it to a remote instance. Otherwise we lose
    * the ability by cmdline-addins to determine if any options were
diff --git a/src/libide/gui/ide-application.c b/src/libide/gui/ide-application.c
index 407a5d288..77631e0d3 100644
--- a/src/libide/gui/ide-application.c
+++ b/src/libide/gui/ide-application.c
@@ -339,7 +339,9 @@ ide_application_dispose (GObject *object)
   g_clear_pointer (&self->css_providers, g_hash_table_unref);
   g_clear_pointer (&self->argv, g_strfreev);
   g_clear_pointer (&self->menu_merge_ids, g_hash_table_unref);
+  g_clear_object (&self->recoloring);
   g_clear_object (&self->addins);
+  g_clear_object (&self->editor_settings);
   g_clear_object (&self->settings);
   g_clear_object (&self->network_monitor);
   g_clear_object (&self->menu_manager);
@@ -373,9 +375,11 @@ ide_application_init (IdeApplication *self)
   self->workspace_type = IDE_TYPE_PRIMARY_WORKSPACE;
   self->workbenches = g_ptr_array_new_with_free_func (g_object_unref);
   self->settings = g_settings_new ("org.gnome.builder");
+  self->editor_settings = g_settings_new ("org.gnome.builder.editor");
   self->plugin_gresources = g_hash_table_new_full (g_str_hash, g_str_equal, g_free,
                                                    (GDestroyNotify)g_resource_unref);
   self->css_providers = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref );
+  self->recoloring = gtk_css_provider_new ();
 
   g_application_set_default (G_APPLICATION (self));
   gtk_window_set_default_icon_name (ide_get_application_id ());