status-notifier: Fix elements display on GTK < 3.20

On GTK 3.20 onwards, themes are expected to use CSS names rather than
widget class names, and apparently CSS names are not inherited.  So, a
derived widget altering its CSS name won't be styled as its parent
classes.

Thus, SnItem setting the CSS name "sn-item" avoids being styled as a
"button".  But on older GTK versions, the widget class being used makes
this change ineffective.
Fix that by introducing a custom derived button that doesn't draw the
unwanted parts.

1 files changed, 60 insertions, 0 deletions

diff --git a/applets/notification_area/status-notifier/sn-flat-button.h b/applets/notification_area/status-notifier/sn-flat-button.h
new file mode 100644
index 00000000..1a93d30f
--- /dev/null
+++ b/applets/notification_area/status-notifier/sn-flat-button.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2017 Colomban Wendling <[email protected]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef SN_FLAT_BUTTON_H
+#define SN_FLAT_BUTTON_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define SN_TYPE_FLAT_BUTTON            (sn_flat_button_get_type ())
+#define SN_FLAT_BUTTON(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), SN_TYPE_FLAT_BUTTON, SnFlatButton))
+#define SN_FLAT_BUTTON_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), SN_TYPE_FLAT_BUTTON, SnFlatButtonClass))
+#define SN_IS_FLAT_BUTTON(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), SN_TYPE_FLAT_BUTTON))
+#define SN_IS_FLAT_BUTTON_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), SN_TYPE_FLAT_BUTTON))
+#define SN_FLAT_BUTTON_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), SN_TYPE_FLAT_BUTTON, SnFlatButtonClass))
+
+typedef struct _SnFlatButton        SnFlatButton;
+typedef struct _SnFlatButtonPrivate SnFlatButtonPrivate;
+typedef struct _SnFlatButtonClass   SnFlatButtonClass;
+
+struct _SnFlatButton
+{
+  GtkButton parent_instance;
+
+  SnFlatButtonPrivate *priv;
+};
+
+struct _SnFlatButtonClass
+{
+  GtkButtonClass parent_class;
+};
+
+GType sn_flat_button_get_type (void);
+GtkWidget *sn_flat_button_new (void);
+
+#if 0
+#ifndef SN_COMPAT_BUTTON_NODRAW_C
+/* replace GtkButton */
+# define gtk_button_get_type sn_compat_button_nodraw_get_type
+#endif
+#endif
+
+G_END_DECLS
+
+#endif