virtual-input/evdev: Translate from button internal codes to evdev

Sending button events to a ClutterVirtualInputDevice, the API expects
button codes to be of the internal clutter type. The evdev
implementation incorrectly assumed it was already prepared evdev event
codes, which was not the case. Fix the evdev implementation to translate
from the internal representation to evdev before passing it along to
ClutterSeatEvdev.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/190

1 files changed, 29 insertions, 6 deletions

diff --git a/clutter/clutter/evdev/clutter-virtual-input-device-evdev.c b/clutter/clutter/evdev/clutter-virtual-input-device-evdev.c
index fe628da85..ab4ddaa14 100644
--- a/clutter/clutter/evdev/clutter-virtual-input-device-evdev.c
+++ b/clutter/clutter/evdev/clutter-virtual-input-device-evdev.c
@@ -185,6 +185,26 @@ clutter_virtual_input_device_evdev_notify_absolute_motion (ClutterVirtualInputDe
                                              NULL);
 }
 
+static int
+translate_to_evdev_button (int clutter_button)
+{
+  switch (clutter_button)
+    {
+    case CLUTTER_BUTTON_PRIMARY:
+      return BTN_LEFT;
+    case CLUTTER_BUTTON_SECONDARY:
+      return BTN_RIGHT;
+    case CLUTTER_BUTTON_MIDDLE:
+      return BTN_MIDDLE;
+    default:
+      /*
+       * For compatibility reasons, all additional buttons go after the old
+       * 4-7 scroll ones.
+       */
+      return clutter_button + (BTN_LEFT - 1) - 4;
+    }
+}
+
 static void
 clutter_virtual_input_device_evdev_notify_button (ClutterVirtualInputDevice *virtual_device,
                                                   uint64_t                   time_us,
@@ -194,30 +214,33 @@ clutter_virtual_input_device_evdev_notify_button (ClutterVirtualInputDevice *vir
   ClutterVirtualInputDeviceEvdev *virtual_evdev =
     CLUTTER_VIRTUAL_INPUT_DEVICE_EVDEV (virtual_device);
   int button_count;
+  int evdev_button;
 
   if (time_us == CLUTTER_CURRENT_TIME)
     time_us = g_get_monotonic_time ();
 
-  if (get_button_type (button) != EVDEV_BUTTON_TYPE_BUTTON)
+  evdev_button = translate_to_evdev_button (button);
+
+  if (get_button_type (evdev_button) != EVDEV_BUTTON_TYPE_BUTTON)
     {
       g_warning ("Unknown/invalid virtual device button 0x%x pressed",
-                 button);
+                 evdev_button);
       return;
     }
 
-  button_count = update_button_count (virtual_evdev, button, button_state);
+  button_count = update_button_count (virtual_evdev, evdev_button, button_state);
   if (button_count < 0 || button_count > 1)
     {
-      g_warning ("Received multiple virtual 0x%x button %s (ignoring)", button,
+      g_warning ("Received multiple virtual 0x%x button %s (ignoring)", evdev_button,
                  button_state == CLUTTER_BUTTON_STATE_PRESSED ? "presses" : "releases");
-      update_button_count (virtual_evdev, button, 1 - button_state);
+      update_button_count (virtual_evdev, evdev_button, 1 - button_state);
       return;
     }
 
   clutter_seat_evdev_notify_button (virtual_evdev->seat,
                                     virtual_evdev->device,
                                     time_us,
-                                    button,
+                                    evdev_button,
                                     button_state);
 }