[gtk/matthiasc/a11y-logging] a11y: Update GtkCheckButton

[Matthias Clasen <matthiasc src gnome org>]

commit 71fbf35f059bdbf5a10feda63de16164c065a93b
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jul 17 15:51:28 2020 -0400

    a11y: Update GtkCheckButton
    
    This is a bit unfortunate, since the aria modelling
    doesn't quite agree with ours, so we have to listen
    for the togglebutton property change, and we inherit
    the pressed state from the togglebutton accessible.

 gtk/gtkcheckbutton.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
---
diff --git a/gtk/gtkcheckbutton.c b/gtk/gtkcheckbutton.c
index 9761dabebe..530db1237e 100644
--- a/gtk/gtkcheckbutton.c
+++ b/gtk/gtkcheckbutton.c
@@ -171,12 +171,43 @@ gtk_check_button_get_property (GObject      *object,
     }
 }
 
+static void
+update_accessible_state (GtkCheckButton *check_button)
+{
+  GtkCheckButtonPrivate *priv = gtk_check_button_get_instance_private (check_button);
+
+  GtkAccessibleTristate checked_state;
+
+  if (priv->inconsistent)
+    checked_state = GTK_ACCESSIBLE_TRISTATE_MIXED;
+  else if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (check_button)))
+    checked_state = GTK_ACCESSIBLE_TRISTATE_TRUE;
+  else
+    checked_state = GTK_ACCESSIBLE_TRISTATE_FALSE;
+
+  gtk_accessible_update_state (GTK_ACCESSIBLE (check_button),
+                               GTK_ACCESSIBLE_STATE_CHECKED, checked_state,
+                               -1);
+}
+
+static void
+gtk_check_button_notify (GObject    *object,
+                         GParamSpec *pspec)
+{
+  if (pspec->name == I_("active"))
+    update_accessible_state (GTK_CHECK_BUTTON (object));
+
+  if (G_OBJECT_CLASS (gtk_check_button_parent_class)->notify)
+    G_OBJECT_CLASS (gtk_check_button_parent_class)->notify (object, pspec);
+}
+
 static void
 gtk_check_button_class_init (GtkCheckButtonClass *class)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (class);
   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 
+  object_class->notify = gtk_check_button_notify;
   object_class->finalize = gtk_check_button_finalize;
   object_class->set_property = gtk_check_button_set_property;
   object_class->get_property = gtk_check_button_get_property;
@@ -394,6 +425,8 @@ gtk_check_button_set_inconsistent (GtkCheckButton *check_button,
       else
         gtk_widget_unset_state_flags (GTK_WIDGET (check_button), GTK_STATE_FLAG_INCONSISTENT);
 
+      update_accessible_state (check_button);
+
       g_object_notify_by_pspec (G_OBJECT (check_button), props[PROP_INCONSISTENT]);
     }
 }