[gtk/wip/ebassi/a11y-2: 426/442] a11y: Simplify GtkProgressBarAccessible

[Emmanuele Bassi <ebassi src gnome org>]

commit ac3f0df0834da27e4448a0b0e14c375736dcd384
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed May 27 16:04:29 2020 +0100

    a11y: Simplify GtkProgressBarAccessible
    
    Drop the GtkWidgetAccessibleClass.notify_gtk and the
    AtkObjectClass.initialize overrides: they don't do anything relevant.
    
    Instead, have GtkProgressBar update the accessible state when the
    fraction changes.

 gtk/a11y/gtkprogressbaraccessible.c        | 36 +++++-------------------------
 gtk/a11y/gtkprogressbaraccessibleprivate.h | 29 ++++++++++++++++++++++++
 gtk/gtkprogressbar.c                       | 10 ++++++++-
 3 files changed, 44 insertions(+), 31 deletions(-)
---
diff --git a/gtk/a11y/gtkprogressbaraccessible.c b/gtk/a11y/gtkprogressbaraccessible.c
index 62313f0ccc..99aaf95624 100644
--- a/gtk/a11y/gtkprogressbaraccessible.c
+++ b/gtk/a11y/gtkprogressbaraccessible.c
@@ -21,52 +21,28 @@
 
 #include <gtk/gtk.h>
 
-#include "gtkprogressbaraccessible.h"
-
+#include "gtkprogressbaraccessibleprivate.h"
 
 static void atk_value_interface_init (AtkValueIface  *iface);
 
 G_DEFINE_TYPE_WITH_CODE (GtkProgressBarAccessible, gtk_progress_bar_accessible, GTK_TYPE_WIDGET_ACCESSIBLE,
                          G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, atk_value_interface_init))
 
-static void
-gtk_progress_bar_accessible_initialize (AtkObject *obj,
-                                        gpointer   data)
+void
+gtk_progress_bar_accessible_update_value (GtkProgressBarAccessible *self)
 {
-  ATK_OBJECT_CLASS (gtk_progress_bar_accessible_parent_class)->initialize (obj, data);
-
-  obj->role = ATK_ROLE_PROGRESS_BAR;
-}
-
-static void
-gtk_progress_bar_accessible_notify_gtk (GObject    *obj,
-                                        GParamSpec *pspec)
-{
-  GtkWidget *widget = GTK_WIDGET (obj);
-  AtkObject *accessible;
-
-  accessible = gtk_widget_get_accessible (widget);
-
-  if (strcmp (pspec->name, "fraction") == 0)
-    g_object_notify (G_OBJECT (accessible), "accessible-value");
-  else
-    GTK_WIDGET_ACCESSIBLE_CLASS (gtk_progress_bar_accessible_parent_class)->notify_gtk (obj, pspec);
+  g_object_notify (G_OBJECT (self), "accessible-value");
 }
 
 static void
 gtk_progress_bar_accessible_class_init (GtkProgressBarAccessibleClass *klass)
 {
-  AtkObjectClass *class = ATK_OBJECT_CLASS (klass);
-  GtkWidgetAccessibleClass *widget_class = (GtkWidgetAccessibleClass*)klass;
-
-  widget_class->notify_gtk = gtk_progress_bar_accessible_notify_gtk;
-
-  class->initialize = gtk_progress_bar_accessible_initialize;
 }
 
 static void
-gtk_progress_bar_accessible_init (GtkProgressBarAccessible *bar)
+gtk_progress_bar_accessible_init (GtkProgressBarAccessible *self)
 {
+  ATK_OBJECT (self)->role = ATK_ROLE_PROGRESS_BAR;
 }
 
 static void
diff --git a/gtk/a11y/gtkprogressbaraccessibleprivate.h b/gtk/a11y/gtkprogressbaraccessibleprivate.h
new file mode 100644
index 0000000000..120d21c5b2
--- /dev/null
+++ b/gtk/a11y/gtkprogressbaraccessibleprivate.h
@@ -0,0 +1,29 @@
+/* gtkprogressbaraccessibleprivate.h: Private GtkProgressBarAccessible API
+ *
+ * Copyright 2020  GNOME Foundation
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "gtkprogressbaraccessible.h"
+
+G_BEGIN_DECLS
+
+void    gtk_progress_bar_accessible_update_value        (GtkProgressBarAccessible *self);
+
+G_END_DECLS
diff --git a/gtk/gtkprogressbar.c b/gtk/gtkprogressbar.c
index 53104999aa..8490024f4b 100644
--- a/gtk/gtkprogressbar.c
+++ b/gtk/gtkprogressbar.c
@@ -39,7 +39,7 @@
 #include "gtkstylecontextprivate.h"
 #include "gtkwidgetprivate.h"
 
-#include "a11y/gtkprogressbaraccessible.h"
+#include "a11y/gtkprogressbaraccessibleprivate.h"
 
 #include <string.h>
 
@@ -732,6 +732,14 @@ gtk_progress_bar_set_fraction (GtkProgressBar *pbar,
   gtk_widget_queue_allocate (pbar->trough_widget);
   update_fraction_classes (pbar);
 
+  {
+    AtkObject *accessible =
+      _gtk_widget_peek_accessible (GTK_WIDGET (pbar));
+
+    if (accessible != NULL)
+      gtk_progress_bar_accessible_update_value (GTK_PROGRESS_BAR_ACCESSIBLE (accessible));
+  }
+
   g_object_notify_by_pspec (G_OBJECT (pbar), progress_props[PROP_FRACTION]);
 }