Devices that have left and right buttons but no middle button get middle
button emulation (without config). Devices that have a middle button too get
a config option but default to off. Most mice have LMR set as buttons,
regardless whether they have a middle button.
Signed-off-by: Peter Hutterer <peter.hutte...@who-t.net>
Reviewed-by: Hans de Goede <hdego...@redhat.com>
---
Changes to v1:
- use extra variables to make the code clearer, no functional changes
otherwise
src/evdev.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/src/evdev.c b/src/evdev.c
index 6ca874a..da33eae 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -1143,6 +1143,24 @@ fallback_dispatch_create(struct libinput_device *device)
evdev_init_calibration(evdev_device, dispatch);
evdev_init_sendevents(evdev_device, dispatch);
+ /* BTN_MIDDLE is set on mice even when it's not present. So
+ * we can only use the absense of BTN_MIDDLE to mean something, i.e.
+ * we enable it by default on anything that only has L&R.
+ * If we have L&R and no middle, we don't expose it as config
+ * option */
+ if (libevdev_has_event_code(evdev_device->evdev, EV_KEY, BTN_LEFT) &&
+ libevdev_has_event_code(evdev_device->evdev, EV_KEY, BTN_RIGHT)) {
+ bool has_middle = libevdev_has_event_code(evdev_device->evdev,
+ EV_KEY,
+ BTN_MIDDLE);
+ bool want_config = has_middle;
+ bool enable_by_default = !has_middle;
+
+ evdev_init_middlebutton(evdev_device,
+ enable_by_default,
+ want_config);
+ }
+
return dispatch;
}
--
2.3.4
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