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backends: add support for scroll button locking

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Where enabled, the first click of the scroll button sets the button logically
down, the second click sets the button logically up.

This is an accessibility feature, it doesn't require users to keep holding the
button down while scrolling which is hard or impossible for some users.

gsettings-desktop-schemas merge request:
https://gitlab.gnome.org/GNOME/gsettings-desktop-schemas/-/merge_requests/39

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1432
This commit is contained in:
Peter Hutterer
2020-09-08 11:08:05 +10:00
committed by Georges Basile Stavracas Neto
parent 1c1c8b25ed
commit e078a007d6
5 changed files with 25 additions and 7 deletions
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9
src/backends/meta-input-settings.c
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@ -858,6 +858,7 @@ update_trackball_scroll_button (MetaInputSettings *input_settings,
MetaInputSettingsClass *input_settings_class;
MetaInputSettingsPrivate *priv;
guint button;
gboolean button_lock;
priv = meta_input_settings_get_instance_private (input_settings);
input_settings_class = META_INPUT_SETTINGS_GET_CLASS (input_settings);
@ -868,10 +869,11 @@ update_trackball_scroll_button (MetaInputSettings *input_settings,
/* 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");
button_lock = g_settings_get_boolean (priv->trackball_settings, "scroll-wheel-emulation-button-lock");
if (device)
{
input_settings_class->set_scroll_button (input_settings, device, button);
input_settings_class->set_scroll_button (input_settings, device, button, button_lock);
}
else if (!device)
{
@ -884,7 +886,7 @@ update_trackball_scroll_button (MetaInputSettings *input_settings,
device = l->data;
if (input_settings_class->is_trackball_device (input_settings, device))
input_settings_class->set_scroll_button (input_settings, device, button);
input_settings_class->set_scroll_button (input_settings, device, button, button_lock);
}
g_list_free (devices);
@ -1282,7 +1284,8 @@ meta_input_settings_changed_cb (GSettings *settings,
}
else if (settings == priv->trackball_settings)
{
if (strcmp (key, "scroll-wheel-emulation-button") == 0)
if (strcmp (key, "scroll-wheel-emulation-button") == 0 ||
strcmp (key, "scroll-wheel-emulation-button-lock") == 0)
update_trackball_scroll_button (input_settings, NULL);
else if (strcmp (key, "accel-profile") == 0)
update_pointer_accel_profile (input_settings, settings, NULL);