[gtk+/matthiasc/wayland/slowkeys: 7/9] wayland: implement toggle keys

[Matthias Clasen <matthiasc src gnome org>]

commit 2cdcae847307ccf0b2ab98ce0ea6e5d70cf71c55
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Mar 2 22:53:19 2016 -0500

    wayland: implement toggle keys
    
    A simple client-side implementation of the AccessX toggle keys
    feature.

 gdk/wayland/gdkdevice-wayland.c |   27 +++++++++++++++++++++++++++
 1 files changed, 27 insertions(+), 0 deletions(-)
---
diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index b6fb749..83f841a 100644
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -1810,6 +1810,17 @@ get_bounce_keys_delay (GdkWaylandDeviceData *device)
   return 100;
 }
 
+static gboolean
+get_toggle_keys_enabled (GdkWaylandDeviceData *device)
+{
+  GSettings *a11y_settings = get_a11y_settings (device);
+
+  if (a11y_settings)
+    return g_settings_get_boolean (a11y_settings, "togglekeys-enable");
+
+  return FALSE;
+}
+
 static void start_key_repeat (GdkWaylandDeviceData *device,
                               uint32_t              key);
 
@@ -1898,6 +1909,18 @@ stop_bounce_keys (GdkWaylandDeviceData *device)
 }
 
 static void
+toggle_keys_apply (GdkWaylandDeviceData *device,
+                   GdkModifierType       from,
+                   GdkModifierType       to)
+{
+  if (get_toggle_keys_enabled (device))
+    {
+      if ((from ^ to) & (GDK_LOCK_MASK | GDK_MOD4_MASK))
+        gdk_display_beep (device->display);
+    }
+}
+
+static void
 start_key_repeat (GdkWaylandDeviceData *device,
                   uint32_t              key)
 {
@@ -2134,14 +2157,18 @@ keyboard_handle_modifiers (void               *data,
   GdkKeymap *keymap;
   struct xkb_state *xkb_state;
   PangoDirection direction;
+  GdkModifierType modifiers;
 
   keymap = device->keymap;
   direction = gdk_keymap_get_direction (keymap);
   xkb_state = _gdk_wayland_keymap_get_xkb_state (keymap);
+  modifiers = device->key_modifiers;
   device->key_modifiers = mods_depressed | mods_latched | mods_locked;
 
   xkb_state_update_mask (xkb_state, mods_depressed, mods_latched, mods_locked, group, 0, 0);
 
+  toggle_keys_apply (device, modifiers, device->key_modifiers);
+
   g_signal_emit_by_name (keymap, "state-changed");
   if (direction != gdk_keymap_get_direction (keymap))
     g_signal_emit_by_name (keymap, "direction-changed");