diff --git a/src/backends/x11/meta-input-settings-x11.c b/src/backends/x11/meta-input-settings-x11.c index 332997b47..eccc68aa7 100644 --- a/src/backends/x11/meta-input-settings-x11.c +++ b/src/backends/x11/meta-input-settings-x11.c @@ -222,19 +222,27 @@ meta_input_settings_x11_set_edge_scroll (MetaInputSettings *settings, gboolean edge_scroll_enabled) { guchar values[SCROLL_METHOD_NUM_FIELDS] = { 0 }; /* 2fg, edge, button. The last value is unused */ - guchar *current; + guchar *current = NULL; + guchar *available = NULL; + + available = get_property (device, "libinput Scroll Methods Available", + XA_INTEGER, 8, SCROLL_METHOD_NUM_FIELDS); + if (!available || !available[SCROLL_METHOD_FIELD_EDGE]) + goto out; current = get_property (device, "libinput Scroll Method Enabled", XA_INTEGER, 8, SCROLL_METHOD_NUM_FIELDS); if (!current) - return; + goto out; memcpy (values, current, SCROLL_METHOD_NUM_FIELDS); values[SCROLL_METHOD_FIELD_EDGE] = !!edge_scroll_enabled; change_property (device, "libinput Scroll Method Enabled", XA_INTEGER, 8, &values, SCROLL_METHOD_NUM_FIELDS); + out: meta_XFree (current); + meta_XFree (available); } static void @@ -243,19 +251,27 @@ meta_input_settings_x11_set_two_finger_scroll (MetaInputSettings *set gboolean two_finger_scroll_enabled) { guchar values[SCROLL_METHOD_NUM_FIELDS] = { 0 }; /* 2fg, edge, button. The last value is unused */ - guchar *current; + guchar *current = NULL; + guchar *available = NULL; + + available = get_property (device, "libinput Scroll Methods Available", + XA_INTEGER, 8, SCROLL_METHOD_NUM_FIELDS); + if (!available || !available[SCROLL_METHOD_FIELD_2FG]) + goto out; current = get_property (device, "libinput Scroll Method Enabled", XA_INTEGER, 8, SCROLL_METHOD_NUM_FIELDS); if (!current) - return; + goto out; memcpy (values, current, SCROLL_METHOD_NUM_FIELDS); values[SCROLL_METHOD_FIELD_2FG] = !!two_finger_scroll_enabled; change_property (device, "libinput Scroll Method Enabled", XA_INTEGER, 8, &values, SCROLL_METHOD_NUM_FIELDS); + out: meta_XFree (current); + meta_XFree (available); } static void