[PATCH weston v2 1/2] libinput: Only forward first and last press and release for a button

[Jonas Ådahl]

Pointer button events will be received from a device where a button has
been pressed, even though an equivalent button has been pressed (same
button code) on a device connected to the same seat. notify_button()
expects to only be called as if there was only one pointer device
associated with the given seat, so to achieve this, ignore every event
where forwarding it would result in multiple 'pressed' or 'released'
notifications.

Signed-off-by: Jonas Ådahl <jadahl at gmail.com>
Reviewed-by: Peter Hutterer <peter.hutterer at who-t.net>
Reviewed-by: Daniel Stone <daniels at collabora.com>
---

Changed since v1:

New commit message subject


 src/libinput-device.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/libinput-device.c b/src/libinput-device.c
index 3ce74b8..5c5b9b9 100644
--- a/src/libinput-device.c
+++ b/src/libinput-device.c
@@ -119,6 +119,17 @@ handle_pointer_button(struct libinput_device *libinput_device,
 {
 	struct evdev_device *device =
 		libinput_device_get_user_data(libinput_device);
+	int button_state =
+		libinput_event_pointer_get_button_state(pointer_event);
+	int seat_button_count =
+		libinput_event_pointer_get_seat_button_count(pointer_event);
+
+	/* Ignore button events that are not seat wide state changes. */
+	if ((button_state == LIBINPUT_BUTTON_STATE_PRESSED &&
+	     seat_button_count != 1) ||
+	    (button_state == LIBINPUT_BUTTON_STATE_RELEASED &&
+	     seat_button_count != 0))
+		return;
 
 	notify_button(device->seat,
 		      libinput_event_pointer_get_time(pointer_event),
-- 
2.1.0