[mutter] clutter/evdev: Implement togglekeys notification

[Olivier Fourdan <ofourdan src gnome org>]

commit 02fc0b453374c21c76c3b2a83eb9edf5e18b110f
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Wed Jun 12 11:59:41 2019 +0200

    clutter/evdev: Implement togglekeys notification
    
    Notify with a system sound when the modifiers lock state is changed.
    
    Closes: https://gitlab.gnome.org/GNOME/mutter/issues/637

 clutter/clutter/evdev/clutter-input-device-evdev.c | 7 +++++++
 clutter/clutter/evdev/clutter-input-device-evdev.h | 1 +
 clutter/clutter/evdev/clutter-seat-evdev.c         | 1 +
 3 files changed, 9 insertions(+)
---
diff --git a/clutter/clutter/evdev/clutter-input-device-evdev.c 
b/clutter/clutter/evdev/clutter-input-device-evdev.c
index 105d769fa..f315bfb60 100644
--- a/clutter/clutter/evdev/clutter-input-device-evdev.c
+++ b/clutter/clutter/evdev/clutter-input-device-evdev.c
@@ -1246,6 +1246,13 @@ clutter_input_device_evdev_apply_kbd_a11y_settings (ClutterInputDeviceEvdev *dev
   device->a11y_flags = settings->controls;
 }
 
+void
+clutter_evdev_a11y_maybe_notify_toggle_keys (ClutterInputDeviceEvdev *device)
+{
+  if (device->a11y_flags & CLUTTER_A11Y_TOGGLE_KEYS_ENABLED)
+    clutter_input_device_evdev_bell_notify ();
+}
+
 static void
 release_device_touch_slot (gpointer value)
 {
diff --git a/clutter/clutter/evdev/clutter-input-device-evdev.h 
b/clutter/clutter/evdev/clutter-input-device-evdev.h
index d3cd45a44..f4515a7d3 100644
--- a/clutter/clutter/evdev/clutter-input-device-evdev.h
+++ b/clutter/clutter/evdev/clutter-input-device-evdev.h
@@ -150,6 +150,7 @@ void                      clutter_input_device_evdev_release_touch_state (Clutte
 void                      clutter_input_device_evdev_release_touch_slots (ClutterInputDeviceEvdev 
*device_evdev,
                                                                           uint64_t                 time_us);
 
+void                      clutter_evdev_a11y_maybe_notify_toggle_keys  (ClutterInputDeviceEvdev *);
 
 G_END_DECLS
 
diff --git a/clutter/clutter/evdev/clutter-seat-evdev.c b/clutter/clutter/evdev/clutter-seat-evdev.c
index 9e8e3ffb1..888db6e4f 100644
--- a/clutter/clutter/evdev/clutter-seat-evdev.c
+++ b/clutter/clutter/evdev/clutter-seat-evdev.c
@@ -326,6 +326,7 @@ clutter_seat_evdev_notify_key (ClutterSeatEvdev   *seat,
       backend = clutter_get_default_backend ();
       g_signal_emit_by_name (clutter_backend_get_keymap (backend), "state-changed");
       clutter_seat_evdev_sync_leds (seat);
+      clutter_evdev_a11y_maybe_notify_toggle_keys (CLUTTER_INPUT_DEVICE_EVDEV (seat->core_keyboard));
     }
 
   if (state == 0 ||             /* key release */