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From 42a526581d1216d835dbbbeab5a7bdb75b349179 Mon Sep 17 00:00:00 2001
From: Jason Gerecke <killertofu@gmail.com>
Date: Tue, 10 Oct 2017 09:18:25 -0700
Subject: [PATCH 1/2] clutter/evdev: Add support for BTN_STYLUS3

BTN_STYLUS3 is defined by the Linux 4.15 kernel and is sent when the
third button on a stylus is pressed. At the moment, only Wacom's "Pro
Pen 3D" has three stylus buttons. Pressing this button triggers a button
8 event to be sent under X11, so we use the same mapping here.

https://bugzilla.gnome.org/show_bug.cgi?id=790033
---
 clutter/clutter/evdev/clutter-seat-evdev.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/clutter/clutter/evdev/clutter-seat-evdev.c b/clutter/clutter/evdev/clutter-seat-evdev.c
index e8524da..f98f85a 100644
--- a/clutter/clutter/evdev/clutter-seat-evdev.c
+++ b/clutter/clutter/evdev/clutter-seat-evdev.c
@@ -45,6 +45,10 @@
 
 #define DISCRETE_SCROLL_STEP 10.0
 
+#ifndef BTN_STYLUS3
+#define BTN_STYLUS3 0x149 /* Linux 4.15 */
+#endif
+
 void
 clutter_seat_evdev_set_libinput_seat (ClutterSeatEvdev     *seat,
                                       struct libinput_seat *libinput_seat)
@@ -492,6 +496,10 @@ clutter_seat_evdev_notify_button (ClutterSeatEvdev   *seat,
       button_nr = CLUTTER_BUTTON_MIDDLE;
       break;
 
+    case 0x149: /* BTN_STYLUS3 */
+      button_nr = 8;
+      break;
+
     default:
       /* For compatibility reasons, all additional buttons go after the old 4-7 scroll ones */
       if (clutter_input_device_get_device_type (input_device) == CLUTTER_TABLET_DEVICE)
-- 
2.17.0


From c42c5294d0ca3d27001f217974cad72a40ffae60 Mon Sep 17 00:00:00 2001
From: Jason Gerecke <killertofu@gmail.com>
Date: Tue, 10 Oct 2017 08:55:41 -0700
Subject: [PATCH 2/2] backends: Add support for Wacom stylus
 tertiary-button-action

The tertiary-button-action (see bug 790028) is a place for g-c-c to store
the action which should be performed when a stylus' third button is pressed.
Pressing this button is signaled as a BTN_STYLUS3 event from the kernel or
X11 button 8.

https://bugzilla.gnome.org/show_bug.cgi?id=790033
---
 src/backends/meta-input-settings-private.h       |  3 ++-
 src/backends/meta-input-settings.c               |  5 +++--
 src/backends/native/meta-input-settings-native.c |  5 ++++-
 src/backends/x11/meta-input-settings-x11.c       | 10 ++++++++--
 4 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/backends/meta-input-settings-private.h b/src/backends/meta-input-settings-private.h
index 605690e..893d4ec 100644
--- a/src/backends/meta-input-settings-private.h
+++ b/src/backends/meta-input-settings-private.h
@@ -111,7 +111,8 @@ struct _MetaInputSettingsClass
                                   ClutterInputDevice         *device,
                                   ClutterInputDeviceTool     *tool,
                                   GDesktopStylusButtonAction  primary,
-                                  GDesktopStylusButtonAction  secondary);
+                                  GDesktopStylusButtonAction  secondary,
+                                  GDesktopStylusButtonAction  tertiary);
   gboolean (* has_two_finger_scroll) (MetaInputSettings  *settings,
                                       ClutterInputDevice *device);
 };
diff --git a/src/backends/meta-input-settings.c b/src/backends/meta-input-settings.c
index ec0fc9f..989f9e3 100644
--- a/src/backends/meta-input-settings.c
+++ b/src/backends/meta-input-settings.c
@@ -1453,7 +1453,7 @@ update_stylus_buttonmap (MetaInputSettings      *input_settings,
                          ClutterInputDeviceTool *tool)
 {
   MetaInputSettingsClass *input_settings_class;
-  GDesktopStylusButtonAction primary, secondary;
+  GDesktopStylusButtonAction primary, secondary, tertiary;
   GSettings *tool_settings;
 
   if (clutter_input_device_get_device_type (device) != CLUTTER_TABLET_DEVICE &&
@@ -1468,10 +1468,11 @@ update_stylus_buttonmap (MetaInputSettings      *input_settings,
 
   primary = g_settings_get_enum (tool_settings, "button-action");
   secondary = g_settings_get_enum (tool_settings, "secondary-button-action");
+  tertiary = g_settings_get_enum (tool_settings, "tertiary-button-action");
 
   input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
   input_settings_class->set_stylus_button_map (input_settings, device, tool,
-                                               primary, secondary);
+                                               primary, secondary, tertiary);
 }
 
 static void
diff --git a/src/backends/native/meta-input-settings-native.c b/src/backends/native/meta-input-settings-native.c
index beb7217..7450725 100644
--- a/src/backends/native/meta-input-settings-native.c
+++ b/src/backends/native/meta-input-settings-native.c
@@ -547,12 +547,15 @@ meta_input_settings_native_set_stylus_button_map (MetaInputSettings          *se
                                                   ClutterInputDevice         *device,
                                                   ClutterInputDeviceTool     *tool,
                                                   GDesktopStylusButtonAction  primary,
-                                                  GDesktopStylusButtonAction  secondary)
+                                                  GDesktopStylusButtonAction  secondary,
+                                                  GDesktopStylusButtonAction  tertiary)
 {
   clutter_evdev_input_device_tool_set_button_code (tool, CLUTTER_BUTTON_MIDDLE,
                                                    action_to_evcode (primary));
   clutter_evdev_input_device_tool_set_button_code (tool, CLUTTER_BUTTON_SECONDARY,
                                                    action_to_evcode (secondary));
+  clutter_evdev_input_device_tool_set_button_code (tool, 8, /* Back */
+                                                   action_to_evcode (tertiary));
 }
 
 static void
diff --git a/src/backends/x11/meta-input-settings-x11.c b/src/backends/x11/meta-input-settings-x11.c
index 4867b6b..7d5239f 100644
--- a/src/backends/x11/meta-input-settings-x11.c
+++ b/src/backends/x11/meta-input-settings-x11.c
@@ -1031,7 +1031,8 @@ meta_input_settings_x11_set_stylus_button_map (MetaInputSettings          *setti
                                                ClutterInputDevice         *device,
                                                ClutterInputDeviceTool     *tool,
                                                GDesktopStylusButtonAction  primary,
-                                               GDesktopStylusButtonAction  secondary)
+                                               GDesktopStylusButtonAction  secondary,
+                                               GDesktopStylusButtonAction  tertiary)
 {
   MetaDisplay *display = meta_get_display ();
   MetaBackend *backend = meta_get_backend ();
@@ -1046,10 +1047,15 @@ meta_input_settings_x11_set_stylus_button_map (MetaInputSettings          *setti
   xdev = device_ensure_xdevice (device);
   if (xdev)
     {
-      guchar map[3] = {
+      guchar map[8] = {
         CLUTTER_BUTTON_PRIMARY,
         action_to_button (primary, CLUTTER_BUTTON_MIDDLE),
         action_to_button (secondary, CLUTTER_BUTTON_SECONDARY),
+        4,
+        5,
+        6,
+        7,
+        action_to_button (tertiary, 8), /* "Back" */
       };
 
       XSetDeviceButtonMapping (xdisplay, xdev, map, G_N_ELEMENTS (map));
-- 
2.17.0