From 87af999b5dca473db1509b9f5ed403da4c6e54ee Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Thu, 4 Aug 2016 19:47:13 +0200
Subject: [PATCH] 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.

https://bugzilla.gnome.org/show_bug.cgi?id=770026
---
 gdk/wayland/gdkdevice-wayland.c | 62 +++++++++++++++++++++++++++++++++
 gdk/wayland/gdkwaylanddevice.h  |  6 ++++
 2 files changed, 68 insertions(+)

diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index 70b95d47f4..ee037df59b 100644
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -5202,3 +5202,65 @@ 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 b02ceeb8e8..e7a3b9ab0c 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__ */
-- 
2.30.2