gdk: Add GdkDevicePad

This is an interface meant to be implemented by the "pad" devices.
This device-specific interface exposes the mapping of all pad features,
it allows retrieving:
- The number of buttons/rings/strips
- The number of groups
- The number of modes a group has
- Whether a given button/ring/strip belongs to a given group

https://bugzilla.gnome.org/show_bug.cgi?id=770026

1 files changed, 45 insertions, 0 deletions

diff --git a/gdk/gdkdevicepadprivate.h b/gdk/gdkdevicepadprivate.h
new file mode 100644
index 0000000000..a4f190066b
--- /dev/null
+++ b/gdk/gdkdevicepadprivate.h
@@ -0,0 +1,45 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2016 Red Hat
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Carlos Garnacho <carlosg@gnome.org>
+ */
+
+#ifndef __GDK_DEVICE_PAD_PRIVATE_H__
+#define __GDK_DEVICE_PAD_PRIVATE_H__
+
+#include "gdkdevicepad.h"
+
+G_BEGIN_DECLS
+
+#define GDK_DEVICE_PAD_GET_IFACE(obj)  (G_TYPE_INSTANCE_GET_INTERFACE ((obj), GDK_TYPE_DEVICE_PAD, GdkDevicePadInterface))
+
+struct _GdkDevicePadInterface {
+  GTypeInterface parent_interface;
+
+  gint (* get_n_groups)      (GdkDevicePad        *pad);
+
+  gint (* get_group_n_modes) (GdkDevicePad        *pad,
+                              gint                 group);
+  gint (* get_n_features)    (GdkDevicePad        *pad,
+                              GdkDevicePadFeature  feature);
+  gint (* get_feature_group) (GdkDevicePad        *pad,
+                              GdkDevicePadFeature  feature,
+                              gint                 idx);
+};
+
+G_END_DECLS
+
+#endif /* __GDK_DEVICE_PAD_PRIVATE_H__ */