From 45f6bed7809dadb40df98308b9041fe08b453871 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Tyrychtr?= <ltyrycht@redhat.com>
Date: Wed, 5 Feb 2025 19:03:50 +0100
Subject: [PATCH] backends/native: Propagate a11y modifiers from
 MetaA11yManager

Listen to changes in MetaA11yManager configured modifiers, and propagate
these along to the MetaSeatNative. This lets the backend keep track of
configuration changes in a11y modifiers.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4217>
---
 src/backends/native/meta-backend-native.c | 25 +++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/backends/native/meta-backend-native.c b/src/backends/native/meta-backend-native.c
index 812811f6d..cc87801e8 100644
--- a/src/backends/native/meta-backend-native.c
+++ b/src/backends/native/meta-backend-native.c
@@ -39,6 +39,7 @@
 #include <drm_fourcc.h>
 #include <stdlib.h>
 
+#include "backends/meta-a11y-manager.h"
 #include "backends/meta-color-manager.h"
 #include "backends/meta-cursor-tracker-private.h"
 #include "backends/meta-idle-manager.h"
@@ -176,6 +177,23 @@ update_viewports (MetaBackend *backend)
   g_object_unref (viewports);
 }
 
+static void
+on_a11y_modifiers_changed (MetaA11yManager *a11y_manager,
+                           MetaBackend     *backend)
+{
+  MetaSeatNative *seat;
+  ClutterBackend *clutter_backend;
+  g_autofree uint32_t *modifiers;
+  int n_modifiers;
+
+  clutter_backend = meta_backend_get_clutter_backend (backend);
+  seat = META_SEAT_NATIVE (clutter_backend_get_default_seat (clutter_backend));
+  modifiers = meta_a11y_manager_get_modifier_keysyms (a11y_manager,
+                                                      &n_modifiers);
+
+  meta_seat_native_set_a11y_modifiers (seat, modifiers, n_modifiers);
+}
+
 static gboolean
 meta_backend_native_init_post (MetaBackend  *backend,
                                GError      **error)
@@ -185,6 +203,7 @@ meta_backend_native_init_post (MetaBackend  *backend,
     meta_backend_native_get_instance_private (backend_native);
   MetaMonitorManager *monitor_manager =
     meta_backend_get_monitor_manager (backend);
+  MetaA11yManager *a11y_manager = meta_backend_get_a11y_manager (backend);
 
   g_clear_pointer (&priv->startup_render_devices,
                    g_hash_table_unref);
@@ -193,6 +212,12 @@ meta_backend_native_init_post (MetaBackend  *backend,
                             G_CALLBACK (update_viewports), backend);
   update_viewports (backend);
 
+  g_signal_connect_object (a11y_manager,
+                           "a11y-modifiers-changed",
+                           G_CALLBACK (on_a11y_modifiers_changed),
+                           backend,
+                           G_CONNECT_DEFAULT);
+
   return TRUE;
 }