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input-settings: detect trackball using udev ID_INPUT_TRACKBALL

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Previously, trackballs were detected based on the presence of the
substring "trackball" in the device name. This had the downside of
missing devices, such as the Kensington Expert Mouse, which don't have
"trackball" in their names.

Rather than depending on the device name, use the ID_INPUT_TRACKBALL
property from udev to determine whether or not to treat a device as a
trackball.

This adds a new function, `is_trackball_device`, to MetaInputEvents, and
eliminates the `meta_input_device_is_trackball` function.

Fixes: https://gitlab.gnome.org/GNOME/mutter/issues/258
This commit is contained in:
Tony Novak
2018-09-17 15:31:16 -04:00
committed by Jonas Ådahl
parent a8a3c1017f
commit 8685de9607
4 changed files with 17 additions and 29 deletions
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25
src/backends/meta-input-settings.c
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@ -709,22 +709,6 @@ update_touchpad_send_events (MetaInputSettings *input_settings,
}
}
gboolean
meta_input_device_is_trackball (ClutterInputDevice *device)
{
gboolean is_trackball;
char *name;
if (clutter_input_device_get_device_mode (device) == CLUTTER_INPUT_MODE_MASTER)
return FALSE;
name = g_ascii_strdown (clutter_input_device_get_device_name (device), -1);
is_trackball = strstr (name, "trackball") != NULL;
g_free (name);
return is_trackball;
}
static void
update_trackball_scroll_button (MetaInputSettings *input_settings,
ClutterInputDevice *device)
@ -733,11 +717,12 @@ update_trackball_scroll_button (MetaInputSettings *input_settings,
MetaInputSettingsPrivate *priv;
guint button;
if (device && !meta_input_device_is_trackball (device))
return;
priv = meta_input_settings_get_instance_private (input_settings);
input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
if (device && !input_settings_class->is_trackball_device (input_settings, device))
return;
/* This key is 'i' in the schema but it also specifies a minimum
* range of 0 so the cast here is safe. */
button = (guint) g_settings_get_int (priv->trackball_settings, "scroll-wheel-emulation-button");
@ -756,7 +741,7 @@ update_trackball_scroll_button (MetaInputSettings *input_settings,
{
device = devices->data;
if (meta_input_device_is_trackball (device))
if (input_settings_class->is_trackball_device (input_settings, device))
input_settings_class->set_scroll_button (input_settings, device, button);
devices = devices->next;