GTK+-3: Port PlumaStatusComboBox to the new GtkStyleContext

taken from:
https://git.gnome.org/browse/gedit/commit/?h=gnome-3-0&id=054bd40
https://git.gnome.org/browse/gedit/commit/?h=gnome-3-0&id=0b2b59f

1 files changed, 50 insertions, 0 deletions

diff --git a/pluma/pluma-status-combo-box.c b/pluma/pluma-status-combo-box.c
index 20166c59..91973ca6 100644
--- a/pluma/pluma-status-combo-box.c
+++ b/pluma/pluma-status-combo-box.c
@@ -106,6 +106,39 @@ pluma_status_combo_box_set_property (GObject      *object,
 	}
 }
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+static void
+pluma_status_combo_box_constructed (GObject *object)
+{
+	PlumaStatusComboBox *combo = PLUMA_STATUS_COMBO_BOX (object);
+	GtkStyleContext *context;
+	GtkCssProvider *css;
+	GError *error = NULL;
+	const gchar style[] =
+		"* {\n"
+#if !GTK_CHECK_VERSION (3, 20, 0)
+		"	-GtkWidget-focus-line-width: 0;\n"
+		"	-GtkWidget-focus-padding: 0;\n"
+#endif
+		"	padding: 0;\n"
+		"}";
+
+	/* make it as small as possible */
+	css = gtk_css_provider_new ();
+	if (!gtk_css_provider_load_from_data (css, style, -1, &error))
+	{
+		g_warning ("%s", error->message);
+		g_error_free (error);
+		return;
+	}
+
+	context = gtk_widget_get_style_context (GTK_WIDGET (combo));
+	gtk_style_context_add_provider (context, GTK_STYLE_PROVIDER (css),
+	                                GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+	g_object_unref (css);
+}
+#endif
+
 static void
 pluma_status_combo_box_changed (PlumaStatusComboBox *combo,
 				GtkMenuItem         *item)
@@ -129,6 +162,9 @@ pluma_status_combo_box_class_init (PlumaStatusComboBoxClass *klass)
 	object_class->finalize = pluma_status_combo_box_finalize;
 	object_class->get_property = pluma_status_combo_box_get_property;
 	object_class->set_property = pluma_status_combo_box_set_property;
+#if GTK_CHECK_VERSION (3, 0, 0)
+	object_class->constructed = pluma_status_combo_box_constructed;
+#endif
 	
 	klass->changed = pluma_status_combo_box_changed;
 
@@ -148,6 +184,7 @@ pluma_status_combo_box_class_init (PlumaStatusComboBoxClass *klass)
 					 		      NULL,
 					 		      G_PARAM_READWRITE));
 
+#if !GTK_CHECK_VERSION (3, 0, 0)
 	/* Set up a style for the button to decrease spacing. */
 	gtk_rc_parse_string (
 		"style \"pluma-status-combo-button-style\"\n"
@@ -158,6 +195,7 @@ pluma_status_combo_box_class_init (PlumaStatusComboBoxClass *klass)
 		"  ythickness = 0\n"
 		"}\n"
 		"widget \"*.pluma-status-combo-button\" style \"pluma-status-combo-button-style\"");
+#endif
 
 	g_type_class_add_private (object_class, sizeof(PlumaStatusComboBoxPrivate));
 }
@@ -246,6 +284,17 @@ button_press_event (GtkWidget           *widget,
 static void
 set_shadow_type (PlumaStatusComboBox *combo)
 {
+#if GTK_CHECK_VERSION (3, 0, 0)
+	GtkStyleContext *context;
+	GtkShadowType shadow_type;
+	GtkWidget *statusbar;
+
+	/* This is a hack needed to use the shadow type of a statusbar */
+	statusbar = gtk_statusbar_new ();
+	context = gtk_widget_get_style_context (statusbar);
+
+	gtk_style_context_get_style (context, "shadow-type", &shadow_type, NULL);
+#else
 	GtkShadowType shadow_type;
 	GtkWidget *statusbar;
 
@@ -254,6 +303,7 @@ set_shadow_type (PlumaStatusComboBox *combo)
 	gtk_widget_ensure_style (statusbar);
 
 	gtk_widget_style_get (statusbar, "shadow-type", &shadow_type, NULL);
+#endif
 	gtk_frame_set_shadow_type (GTK_FRAME (combo->priv->frame), shadow_type);
 
 	gtk_widget_destroy (statusbar);