/usr/include/gtk-3.0/gtk/gtkcelllayout.h is in libgtk-3-dev 3.4.2-0ubuntu0.9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135  | /* gtkcelllayout.h
 * Copyright (C) 2003  Kristian Rietveld  <kris@gtk.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 */
#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
#error "Only <gtk/gtk.h> can be included directly."
#endif
#ifndef __GTK_CELL_LAYOUT_H__
#define __GTK_CELL_LAYOUT_H__
#include <gtk/gtkcellrenderer.h>
#include <gtk/gtkcellarea.h>
#include <gtk/gtkbuildable.h>
#include <gtk/gtkbuilder.h>
G_BEGIN_DECLS
#define GTK_TYPE_CELL_LAYOUT            (gtk_cell_layout_get_type ())
#define GTK_CELL_LAYOUT(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_CELL_LAYOUT, GtkCellLayout))
#define GTK_IS_CELL_LAYOUT(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_CELL_LAYOUT))
#define GTK_CELL_LAYOUT_GET_IFACE(obj)  (G_TYPE_INSTANCE_GET_INTERFACE ((obj), GTK_TYPE_CELL_LAYOUT, GtkCellLayoutIface))
typedef struct _GtkCellLayout           GtkCellLayout; /* dummy typedef */
typedef struct _GtkCellLayoutIface      GtkCellLayoutIface;
/* keep in sync with GtkTreeCellDataFunc */
/**
 * GtkCellLayoutDataFunc:
 * @cell_layout: a #GtkCellLayout
 * @cell: the cell renderer whose value is to be set
 * @tree_model: the model
 * @iter: a #GtkTreeIter indicating the row to set the value for
 * @data: user data passed to gtk_cell_layout_set_cell_data_func()
 *
 * A function which should set the value of @cell_layout's cell renderer(s)
 * as appropriate. 
 */
typedef void (* GtkCellLayoutDataFunc) (GtkCellLayout   *cell_layout,
                                        GtkCellRenderer *cell,
                                        GtkTreeModel    *tree_model,
                                        GtkTreeIter     *iter,
                                        gpointer         data);
struct _GtkCellLayoutIface
{
  GTypeInterface g_iface;
  /* Virtual Table */
  void (* pack_start)         (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               gboolean               expand);
  void (* pack_end)           (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               gboolean               expand);
  void (* clear)              (GtkCellLayout         *cell_layout);
  void (* add_attribute)      (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               const gchar           *attribute,
                               gint                   column);
  void (* set_cell_data_func) (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               GtkCellLayoutDataFunc  func,
                               gpointer               func_data,
                               GDestroyNotify         destroy);
  void (* clear_attributes)   (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell);
  void (* reorder)            (GtkCellLayout         *cell_layout,
                               GtkCellRenderer       *cell,
                               gint                   position);
  GList* (* get_cells)        (GtkCellLayout         *cell_layout);
  GtkCellArea *(* get_area)   (GtkCellLayout         *cell_layout);
};
GType gtk_cell_layout_get_type           (void) G_GNUC_CONST;
void  gtk_cell_layout_pack_start         (GtkCellLayout         *cell_layout,
                                          GtkCellRenderer       *cell,
                                          gboolean               expand);
void  gtk_cell_layout_pack_end           (GtkCellLayout         *cell_layout,
                                          GtkCellRenderer       *cell,
                                          gboolean               expand);
GList *gtk_cell_layout_get_cells         (GtkCellLayout         *cell_layout);
void  gtk_cell_layout_clear              (GtkCellLayout         *cell_layout);
void  gtk_cell_layout_set_attributes     (GtkCellLayout         *cell_layout,
                                          GtkCellRenderer       *cell,
                                          ...) G_GNUC_NULL_TERMINATED;
void  gtk_cell_layout_add_attribute      (GtkCellLayout         *cell_layout,
                                          GtkCellRenderer       *cell,
                                          const gchar           *attribute,
                                          gint                   column);
void  gtk_cell_layout_set_cell_data_func (GtkCellLayout         *cell_layout,
                                          GtkCellRenderer       *cell,
                                          GtkCellLayoutDataFunc  func,
                                          gpointer               func_data,
                                          GDestroyNotify         destroy);
void  gtk_cell_layout_clear_attributes   (GtkCellLayout         *cell_layout,
                                          GtkCellRenderer       *cell);
void  gtk_cell_layout_reorder            (GtkCellLayout         *cell_layout,
                                          GtkCellRenderer       *cell,
                                          gint                   position);
GtkCellArea *gtk_cell_layout_get_area    (GtkCellLayout         *cell_layout);
gboolean _gtk_cell_layout_buildable_custom_tag_start (GtkBuildable  *buildable,
						      GtkBuilder    *builder,
						      GObject       *child,
						      const gchar   *tagname,
						      GMarkupParser *parser,
						      gpointer      *data);
gboolean _gtk_cell_layout_buildable_custom_tag_end   (GtkBuildable  *buildable,
						      GtkBuilder    *builder,
						      GObject       *child,
						      const gchar   *tagname,
						      gpointer      *data);
void _gtk_cell_layout_buildable_add_child            (GtkBuildable  *buildable,
						      GtkBuilder    *builder,
						      GObject       *child,
						      const gchar   *type);
G_END_DECLS
#endif /* __GTK_CELL_LAYOUT_H__ */
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