css: Add support for Adwaita

xed/resources/css/xed.adwaita.css

@@ -0,0 +1,17 @@
+.xed-window .primary-toolbar {
+    border: 0px solid @borders;
+    border-bottom-width: 1px;
+}
+
+.xed-statusbar {
+    border: 0px solid @borders;
+    border-top-width: 1px;
+}
+
+.xed-searchbar {
+    box-shadow: inset 0 1px @borders;
+}
+
+.xed-statusbar button {
+    padding: 0 4px;
+}

xed/resources/xed.gresource.xml

@@ -9,5 +9,6 @@
     <file preprocess="xml-stripblanks">ui/xed-shortcuts.ui</file>
     <file preprocess="xml-stripblanks">ui/xed-view-frame.ui</file>
     <file>css/xed-style.css</file>
+    <file>css/xed.adwaita.css</file>
   </gresource>
 </gresources>

xed/xed-app.c

@@ -223,6 +223,54 @@ set_initial_theme_style (XedApp *app)
     }
 }
 
+static void
+theme_changed (GtkSettings *settings,
+               GParamSpec  *pspec,
+               gpointer     data)
+{
+    static GtkCssProvider *provider;
+    gchar *theme;
+    GdkScreen *screen;
+
+    g_object_get (settings, "gtk-theme-name", &theme, NULL);
+    screen = gdk_screen_get_default ();
+
+    if (g_str_equal (theme, "Adwaita"))
+    {
+        if (provider == NULL)
+        {
+            GFile *file;
+
+            provider = gtk_css_provider_new ();
+            file = g_file_new_for_uri ("resource:///org/x/editor/css/xed.adwaita.css");
+            gtk_css_provider_load_from_file (provider, file, NULL);
+            g_object_unref (file);
+        }
+
+        gtk_style_context_add_provider_for_screen (screen,
+                                                   GTK_STYLE_PROVIDER (provider),
+                                                   GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+    }
+    else if (provider != NULL)
+    {
+        gtk_style_context_remove_provider_for_screen (screen, GTK_STYLE_PROVIDER (provider));
+        g_clear_object (&provider);
+    }
+
+    g_free (theme);
+}
+
+static void
+setup_theme_extensions (void)
+{
+    GtkSettings *settings;
+
+    settings = gtk_settings_get_default ();
+    g_signal_connect (settings, "notify::gtk-theme-name",
+                      G_CALLBACK (theme_changed), NULL);
+    theme_changed (settings, NULL, NULL);
+}
+
 static void
 xed_app_startup (GApplication *application)
 {
@@ -251,6 +299,8 @@ xed_app_startup (GApplication *application)
     gtk_icon_theme_append_search_path (gtk_icon_theme_get_default (), icon_dir);
     g_free (icon_dir);
 
+    setup_theme_extensions ();
+
 #ifndef ENABLE_GVFS_METADATA
     /* Setup metadata-manager */
     cache_dir = xed_dirs_get_user_cache_dir ();