[gtk+/wip/wayland-tablet-v2: 64/66] wayland: Offer wayland-specific method to set pad actions feedback

[Carlos Garnacho <carlosg src gnome org>]

commit 77e70ca7f85610bdbc661ae4cbaa6bb739daf52c
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Aug 4 19:47:13 2016 +0200

    wayland: Offer wayland-specific method to set pad actions feedback
    
    The wayland tablet protocol allows notifying the compositor with
    descriptions of the actions performed by each tablet element. This
    API call allows to hook up in to this wayland-specific feature.

 gdk/wayland/gdkdevice-wayland.c |   62 +++++++++++++++++++++++++++++++++++++++
 gdk/wayland/gdkwaylanddevice.h  |    6 ++++
 2 files changed, 68 insertions(+), 0 deletions(-)
---
diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index 55ab628..0c6ec8f 100644
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -5198,3 +5198,65 @@ gdk_wayland_device_get_node_path (GdkDevice *device)
 
   return NULL;
 }
+
+/**
+ * gdk_wayland_device_pad_set_feedback:
+ * @device: a %GDK_SOURCE_TABLET_PAD device
+ * @feature: Feature to set the feedback label for
+ * @feature_idx: 0-indexed index of the feature to set the feedback label for
+ * @label: Feedback label
+ *
+ * Sets the feedback label for the given feature/index. This may be used by the
+ * compositor to provide user feedback of the actions available/performed.
+ **/
+void
+gdk_wayland_device_pad_set_feedback (GdkDevice           *device,
+                                     GdkDevicePadFeature  feature,
+                                     guint                feature_idx,
+                                     const gchar         *label)
+{
+  GdkWaylandTabletPadData *pad;
+  GdkWaylandTabletPadGroupData *group;
+  GdkSeat *seat;
+
+  seat = gdk_device_get_seat (device);
+  pad = gdk_wayland_device_manager_find_pad (GDK_WAYLAND_SEAT (seat),
+                                             device);
+  if (!pad)
+    return;
+
+  if (feature == GDK_DEVICE_PAD_FEATURE_BUTTON)
+    {
+      group = tablet_pad_lookup_button_group (pad, feature_idx);
+      if (!group)
+        return;
+
+      zwp_tablet_pad_v2_set_feedback (pad->wp_tablet_pad, feature_idx, label,
+                                      group->mode_switch_serial);
+    }
+  else if (feature == GDK_DEVICE_PAD_FEATURE_RING)
+    {
+      struct zwp_tablet_pad_ring_v2 *wp_pad_ring;
+
+      wp_pad_ring = g_list_nth_data (pad->rings, feature_idx);
+      if (!wp_pad_ring)
+        return;
+
+      group = zwp_tablet_pad_ring_v2_get_user_data (wp_pad_ring);
+      zwp_tablet_pad_ring_v2_set_feedback (wp_pad_ring, label,
+                                           group->mode_switch_serial);
+
+    }
+  else if (feature == GDK_DEVICE_PAD_FEATURE_STRIP)
+    {
+      struct zwp_tablet_pad_strip_v2 *wp_pad_strip;
+
+      wp_pad_strip = g_list_nth_data (pad->strips, feature_idx);
+      if (!wp_pad_strip)
+        return;
+
+      group = zwp_tablet_pad_strip_v2_get_user_data (wp_pad_strip);
+      zwp_tablet_pad_strip_v2_set_feedback (wp_pad_strip, label,
+                                            group->mode_switch_serial);
+    }
+}
diff --git a/gdk/wayland/gdkwaylanddevice.h b/gdk/wayland/gdkwaylanddevice.h
index b02ceeb..e7a3b9a 100644
--- a/gdk/wayland/gdkwaylanddevice.h
+++ b/gdk/wayland/gdkwaylanddevice.h
@@ -58,6 +58,12 @@ struct wl_seat      *gdk_wayland_seat_get_wl_seat           (GdkSeat   *seat);
 GDK_AVAILABLE_IN_3_22
 const gchar         *gdk_wayland_device_get_node_path       (GdkDevice *device);
 
+GDK_AVAILABLE_IN_3_22
+void                 gdk_wayland_device_pad_set_feedback (GdkDevice           *device,
+                                                          GdkDevicePadFeature  element,
+                                                          guint                idx,
+                                                          const gchar         *label);
+
 G_END_DECLS
 
 #endif /* __GDK_WAYLAND_DEVICE_H__ */