From 9f1aa3141b8aa4b626c4666bd8ce31a97e7b11eb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Tyrychtr?= <ltyrycht@redhat.com>
Date: Thu, 11 Apr 2024 14:25:42 +0200
Subject: [PATCH] a11y: Implement GtkAccessibleRange for scrollbars

Fixes gnome-control-center#2994
---
 gtk/gtkscrollbar.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/gtk/gtkscrollbar.c b/gtk/gtkscrollbar.c
index ec9702ae9c..1c1778a0b5 100644
--- a/gtk/gtkscrollbar.c
+++ b/gtk/gtkscrollbar.c
@@ -28,6 +28,7 @@
 #include "gtkscrollbar.h"
 #include "gtkrange.h"
 
+#include "gtkaccessiblerange.h"
 #include "gtkadjustment.h"
 #include "gtkorientable.h"
 #include "gtkprivate.h"
@@ -107,13 +108,38 @@ enum {
   LAST_PROP = PROP_ORIENTATION
 };
 
+static void gtk_scrollbar_accessible_range_init (GtkAccessibleRangeInterface *iface);
+
 G_DEFINE_TYPE_WITH_CODE (GtkScrollbar, gtk_scrollbar, GTK_TYPE_WIDGET,
                          G_ADD_PRIVATE (GtkScrollbar)
-                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))
-
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL)
+                         G_IMPLEMENT_INTERFACE (GTK_TYPE_ACCESSIBLE_RANGE, 
+                         gtk_scrollbar_accessible_range_init))
 
 static GParamSpec *props[LAST_PROP] = { NULL, };
 
+static gboolean
+accessible_range_set_current_value (GtkAccessibleRange *range,
+                                    double              value)
+{
+  GtkScrollbar *self = GTK_SCROLLBAR (range);
+  GtkAdjustment *adjustment = gtk_scrollbar_get_adjustment (self);
+
+  if (adjustment)
+    {
+      gtk_adjustment_set_value (adjustment, value);
+      return true;
+    }
+
+  return false;
+}
+
+static void
+gtk_scrollbar_accessible_range_init (GtkAccessibleRangeInterface *iface)
+{
+  iface->set_current_value = accessible_range_set_current_value;
+}
+
 static void
 gtk_scrollbar_get_property (GObject    *object,
                             guint       property_id,