Add GtkFlowBox

GtkFlowBox is a container that its children in a reflowing
grid, which can be oriented horizontally or vertically.

It is similar to GtkListBox in that the children can
be sorted and filtered, and by requiring a dedicated child
widget type, GtkFlowBoxChild. It is similar to GtkTreeView
in that is supports a full set of selection modes, including
rubberband selection.

This is the culmination of work that has happened in the
egg-list-box module, and earlier in libegg. The origins of
this code are the EggSpreadTable in libegg, which was written
by Tristan van Berkom. It was moved to egg-list-box and
renamed EggFlowBox by Jon McCann, and I gave it some finishing
touched in the flowbox-improvements branch of that module.

gtk/a11y/gtkflowboxchildaccessible.c

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2013 Red Hat, Inc.
+ *
+ * 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 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/>.
+ */
+
+#include "config.h"
+
+#include "gtkflowboxchildaccessible.h"
+
+#include "gtk/gtkflowbox.h"
+
+
+G_DEFINE_TYPE (GtkFlowBoxChildAccessible, gtk_flow_box_child_accessible, GTK_TYPE_CONTAINER_ACCESSIBLE)
+
+static void
+gtk_flow_box_child_accessible_init (GtkFlowBoxChildAccessible *accessible)
+{
+}
+
+static void
+gtk_flow_box_child_accessible_initialize (AtkObject *obj,
+                                          gpointer   data)
+{
+  ATK_OBJECT_CLASS (gtk_flow_box_child_accessible_parent_class)->initialize (obj, data);
+
+  obj->role = ATK_ROLE_TABLE_CELL;
+}
+
+static AtkStateSet *
+gtk_flow_box_child_accessible_ref_state_set (AtkObject *obj)
+{
+  AtkStateSet *state_set;
+  GtkWidget *widget, *parent;
+
+  state_set = ATK_OBJECT_CLASS (gtk_flow_box_child_accessible_parent_class)->ref_state_set (obj);
+
+  widget = gtk_accessible_get_widget (GTK_ACCESSIBLE (obj));
+  if (widget != NULL)
+    {
+      parent = gtk_widget_get_parent (widget);
+      if (gtk_flow_box_get_selection_mode (GTK_FLOW_BOX (parent)) != GTK_SELECTION_NONE)
+        atk_state_set_add_state (state_set, ATK_STATE_SELECTABLE);
+
+      if (gtk_flow_box_child_is_selected (GTK_FLOW_BOX_CHILD (widget)))
+        atk_state_set_add_state (state_set, ATK_STATE_SELECTED);
+    }
+
+  return state_set;
+}
+
+static void
+gtk_flow_box_child_accessible_class_init (GtkFlowBoxChildAccessibleClass *klass)
+{
+  AtkObjectClass *object_class = ATK_OBJECT_CLASS (klass);
+
+  object_class->initialize = gtk_flow_box_child_accessible_initialize;
+  object_class->ref_state_set = gtk_flow_box_child_accessible_ref_state_set;
+}