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/usr/include/gtkmm-3.0/gtkmm/drawingarea.h is in libgtkmm-3.0-dev 3.22.0-1.

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The actual contents of the file can be viewed below.

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// Generated by gmmproc 2.50.0 -- DO NOT MODIFY!
#ifndef _GTKMM_DRAWINGAREA_H
#define _GTKMM_DRAWINGAREA_H


#include <glibmm/ustring.h>
#include <sigc++/sigc++.h>

/*
 * Copyright (C) 1998-2002 The gtkmm Development Team
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <gtkmm/widget.h>


#ifndef DOXYGEN_SHOULD_SKIP_THIS
using GtkDrawingArea = struct _GtkDrawingArea;
using GtkDrawingAreaClass = struct _GtkDrawingAreaClass;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */


#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Gtk
{ class DrawingArea_Class; } // namespace Gtk
#endif //DOXYGEN_SHOULD_SKIP_THIS

namespace Gtk
{

/** A widget for custom user interface elements.
 *
 * @ingroup Widgets
 */

class DrawingArea : public Widget
{
  public:
#ifndef DOXYGEN_SHOULD_SKIP_THIS
  typedef DrawingArea CppObjectType;
  typedef DrawingArea_Class CppClassType;
  typedef GtkDrawingArea BaseObjectType;
  typedef GtkDrawingAreaClass BaseClassType;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */

  DrawingArea(DrawingArea&& src) noexcept;
  DrawingArea& operator=(DrawingArea&& src) noexcept;

  // noncopyable
  DrawingArea(const DrawingArea&) = delete;
  DrawingArea& operator=(const DrawingArea&) = delete;

  ~DrawingArea() noexcept override;

#ifndef DOXYGEN_SHOULD_SKIP_THIS

private:
  friend class DrawingArea_Class;
  static CppClassType drawingarea_class_;

protected:
  explicit DrawingArea(const Glib::ConstructParams& construct_params);
  explicit DrawingArea(GtkDrawingArea* castitem);

#endif /* DOXYGEN_SHOULD_SKIP_THIS */

public:

  /** Get the GType for this class, for use with the underlying GObject type system.
   */
  static GType get_type()      G_GNUC_CONST;

#ifndef DOXYGEN_SHOULD_SKIP_THIS


  static GType get_base_type() G_GNUC_CONST;
#endif

  ///Provides access to the underlying C GtkObject.
  GtkDrawingArea*       gobj()       { return reinterpret_cast<GtkDrawingArea*>(gobject_); }

  ///Provides access to the underlying C GtkObject.
  const GtkDrawingArea* gobj() const { return reinterpret_cast<GtkDrawingArea*>(gobject_); }


public:
  //C++ methods used to invoke GTK+ virtual functions:

protected:
  //GTK+ Virtual Functions (override these to change behaviour):

  //Default Signal Handlers::


private:

public:

  DrawingArea();


};

} //namespace Gtk


namespace Glib
{
  /** A Glib::wrap() method for this object.
   *
   * @param object The C instance.
   * @param take_copy False if the result should take ownership of the C instance. True if it should take a new copy or ref.
   * @result A C++ instance that wraps this C instance.
   *
   * @relates Gtk::DrawingArea
   */
  Gtk::DrawingArea* wrap(GtkDrawingArea* object, bool take_copy = false);
} //namespace Glib


#endif /* _GTKMM_DRAWINGAREA_H */