From d6fc41b73e80fe7b8320254650a3bc058fa955be Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Wed, 28 Dec 2016 11:44:27 +0100
Subject: [PATCH] clutter: Add function to find out the number of modes for a
 pad group

This is obtained in backend-dependent ways in the upper layers, seems
better to let ClutterInputDevice provide this information.

https://bugzilla.gnome.org/show_bug.cgi?id=771098
---
 .../clutter/clutter-device-manager-private.h  |  2 ++
 clutter/clutter/clutter-input-device.c        | 19 +++++++++++++++++++
 clutter/clutter/clutter-input-device.h        |  4 ++++
 .../evdev/clutter-input-device-evdev.c        | 14 ++++++++++++++
 4 files changed, 39 insertions(+)

diff --git a/clutter/clutter/clutter-device-manager-private.h b/clutter/clutter/clutter-device-manager-private.h
index a5544675f..37b2eec6c 100644
--- a/clutter/clutter/clutter-device-manager-private.h
+++ b/clutter/clutter/clutter-device-manager-private.h
@@ -158,6 +158,8 @@ struct _ClutterInputDeviceClass
   gboolean (* is_mode_switch_button) (ClutterInputDevice *device,
                                       guint               group,
                                       guint               button);
+  gint (* get_group_n_modes) (ClutterInputDevice *device,
+                              gint                group);
 };
 
 /* Platform-dependent interface */
diff --git a/clutter/clutter/clutter-input-device.c b/clutter/clutter/clutter-input-device.c
index 89aa09ef6..686e5a804 100644
--- a/clutter/clutter/clutter-input-device.c
+++ b/clutter/clutter/clutter-input-device.c
@@ -2175,6 +2175,25 @@ clutter_input_device_get_n_mode_groups (ClutterInputDevice *device)
   return device->n_mode_groups;
 }
 
+gint
+clutter_input_device_get_group_n_modes (ClutterInputDevice *device,
+                                        gint                group)
+{
+  ClutterInputDeviceClass *device_class;
+
+  g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), 0);
+  g_return_val_if_fail (clutter_input_device_get_device_type (device) ==
+                        CLUTTER_PAD_DEVICE, 0);
+  g_return_val_if_fail (group >= 0, 0);
+
+  device_class = CLUTTER_INPUT_DEVICE_GET_CLASS (device);
+
+  if (device_class->get_group_n_modes)
+    return device_class->get_group_n_modes (device, group);
+
+  return 0;
+}
+
 gboolean
 clutter_input_device_is_mode_switch_button (ClutterInputDevice *device,
                                             guint               group,
diff --git a/clutter/clutter/clutter-input-device.h b/clutter/clutter/clutter-input-device.h
index f9b3edcfe..f80a48ce1 100644
--- a/clutter/clutter/clutter-input-device.h
+++ b/clutter/clutter/clutter-input-device.h
@@ -147,6 +147,10 @@ gint                    clutter_input_device_get_n_strips       (ClutterInputDev
 CLUTTER_AVAILABLE_IN_ALL
 gint                    clutter_input_device_get_n_mode_groups  (ClutterInputDevice *device);
 
+CLUTTER_AVAILABLE_IN_ALL
+gint                    clutter_input_device_get_group_n_modes  (ClutterInputDevice *device,
+                                                                 gint                group);
+
 CLUTTER_AVAILABLE_IN_ALL
 gboolean                clutter_input_device_is_mode_switch_button (ClutterInputDevice *device,
                                                                     guint               group,
diff --git a/clutter/clutter/evdev/clutter-input-device-evdev.c b/clutter/clutter/evdev/clutter-input-device-evdev.c
index 9ad89357b..0dc578dde 100644
--- a/clutter/clutter/evdev/clutter-input-device-evdev.c
+++ b/clutter/clutter/evdev/clutter-input-device-evdev.c
@@ -180,6 +180,19 @@ clutter_input_device_evdev_is_mode_switch_button (ClutterInputDevice *device,
   return libinput_tablet_pad_mode_group_button_is_toggle (mode_group, button) != 0;
 }
 
+static gint
+clutter_input_device_evdev_get_group_n_modes (ClutterInputDevice *device,
+                                              gint                group)
+{
+  struct libinput_device *libinput_device;
+  struct libinput_tablet_pad_mode_group *mode_group;
+
+  libinput_device = clutter_evdev_input_device_get_libinput_device (device);
+  mode_group = libinput_device_tablet_pad_get_mode_group (libinput_device, group);
+
+  return libinput_tablet_pad_mode_group_get_num_modes (mode_group);
+}
+
 static void
 clutter_input_device_evdev_class_init (ClutterInputDeviceEvdevClass *klass)
 {
@@ -192,6 +205,7 @@ clutter_input_device_evdev_class_init (ClutterInputDeviceEvdevClass *klass)
   klass->keycode_to_evdev = clutter_input_device_evdev_keycode_to_evdev;
   klass->update_from_tool = clutter_input_device_evdev_update_from_tool;
   klass->is_mode_switch_button = clutter_input_device_evdev_is_mode_switch_button;
+  klass->get_group_n_modes = clutter_input_device_evdev_get_group_n_modes;
 
   obj_props[PROP_DEVICE_MATRIX] =
     g_param_spec_boxed ("device-matrix",