/* $Id: box.hg,v 1.10 2006/01/28 18:49:13 jjongsma Exp $ */

/* 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 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, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

_DEFS(gtkmm,gtk)
_PINCLUDE(gtkmm/private/container_p.h)

#include <gtkmm/container.h>
#include <glibmm/helperlist.h>
#include <gtk/gtkbox.h>  /* For _GtkBoxChild */


namespace Gtk
{

/** Packing options for adding child widgets to a Box with pack_start() and pack_end(). 
 * @ingroup gtkmmEnums
 */
enum PackOptions
{
  PACK_SHRINK, /**< Space is contracted to the child widget size. */
  PACK_EXPAND_PADDING, /**< Space is expanded, with extra space filled with padding. */
  PACK_EXPAND_WIDGET /**< Space is expanded, with extra space filled by increasing the child widget size. */
};

class Box;

namespace Box_Helpers
{

//This may not have any data or virtual functions. See below.
class Child : protected _GtkBoxChild
{
private:
  Child& operator=(const Child&); //Not implemented.
  Child(const Child&); //Not implemented.

public:
  /// Provides access to the underlying C GObject.
  inline _GtkBoxChild* gobj() { return this; }
  /// Provides access to the underlying C GObject.
  inline const _GtkBoxChild* gobj() const { return this; }

  Widget* get_widget() const;

  inline guint16 get_padding() const   { return (gobj()->padding); }
  inline bool get_expand() const       { return (gobj()->expand); }
  inline bool get_fill() const         { return (gobj()->fill); }
  inline bool get_pack() const         { return (gobj()->pack); }

  void set_options(PackOptions options, guint padding = 0);
  void set_options(bool expand, bool fill, guint padding = 0);

  void set_pack(PackType pack);

protected:
  inline GtkBox* parent()
    { return (GtkBox*) (gobj()->widget->parent); }

  void redraw();

#ifndef DOXYGEN_SHOULD_SKIP_THIS
  friend class Dummy_; // silence the compiler (Child has only private ctors)
#endif
};

class Element
{
public:
 Element(Widget& widget,
          PackOptions options = PACK_EXPAND_WIDGET,
          guint padding = 0,
          PackType pack = PACK_START)
      : widget_(&widget), options_(options),
        padding_(padding), pack_(pack)
    {}

  Widget* widget_;
  PackOptions options_;
  guint padding_;
  PackType pack_;
};

typedef Element StartElem;

struct EndElem : public Element
{
  EndElem(Widget& widget,
          PackOptions options = PACK_EXPAND_WIDGET,
          guint padding = 0)
      : Element (widget, options, padding, PACK_END)
    {}
};

#m4 include(list.m4)
  GP_LIST(BoxList,Box,GtkBox,Child,children)
  //The standard iterator, instead of List_Cpp_Iterator,
  //only works because Child is derived from _GtkBoxChild.
  
  GP_LIST_FIND(get_widget)
  GP_LIST_CONTAINER_REMOVE(get_widget)
        // Non-standard
        void reorder(iterator loc,iterator pos);
  GP_LIST_END()

} /* namespace Box_Helpers */


/** A base class for box containers
 *
 * Abstract base class for horizontal and vertical boxes, which organize a
 * variable number of widgets into a rectangular area.  This is an abstract
 * class and it defers choice of which way the widgets are packed to the screen
 * to the derived classes.  It provides a common interface for inserting
 * widgets to a box indepenently of how it is shown in the screen.
 *
 * Gtk::Box uses a notion of packing. Packing refers to adding widgets with
 * reference to a particular position in a Gtk::Container. There are two
 * reference positions: the start and the end of the box. For a VBox, the start
 * is defined as the top of the box and the end is defined as the bottom.  For
 * a HBox the start is defined as the left side and the end is defined as the
 * right side.  Use repeated calls to pack_start() to pack widgets into a
 * Gtk::Box from start to end. Use pack_end() to add widgets from end to start.
 * You may intersperse these calls and add widgets from both ends of the same
 * Gtk::Box. The last widget added with pack_start() will be placed just before
 * the last widget added with pack_end()
 *
 * Because Gtk::Box is a Gtk::Container, you may also use Gtk::Container::add()
 * to insert widgets, and they will be packed as if with pack_start(). Use
 * Gtk::Container::remove() to remove widgets.
 *
 * Use set_homogeneous() to specify whether or not all children of the Gtk::Box
 * occupy the same amount of space.  Use set_spacing() to determine the minimum
 * space placed between all children in the Gtk::Box.  Use reorder_child() to
 * move a child widget to a different place in the box.  Use
 * set_child_packing() to reset the pack options and padding attributes of any
 * Gtk::Box child. Use query_child_packing() to query these fields.
 */
class Box : public Container
{
  _CLASS_GTKOBJECT(Box,GtkBox,GTK_BOX,Gtk::Container,GtkContainer)
  _IGNORE(gtk_box_pack_end_defaults, gtk_box_set_child_packing, gtk_box_pack_start_defaults, gtk_box_query_child_packing)
public:
  typedef Box_Helpers::BoxList BoxList;

protected:
  _CTOR_DEFAULT
public:

  _WRAP_METHOD(void pack_start(Widget& child, bool expand, bool fill, guint padding = 0), gtk_box_pack_start)

  /** Left side insert a widget to a box.
   * @param child A Widget to be added to box.
   * @param options Controls how the widget expands to fill space, and how the space around them is used.
   * @param padding Padding that is added on either side of the widget. This is different to spacing set when the box is created (or with set_spacing()) - spacing is added between objects, and padding is added on either side of an object.
   */
  void pack_start(Widget& child, PackOptions options = PACK_EXPAND_WIDGET, guint padding = 0);

  _WRAP_METHOD(void pack_end(Widget& child, bool expand, bool fill, guint padding = 0), gtk_box_pack_end)

  /** Right side insert a widget to a box.
   * @param child A Widget to be added to box.
   * @param options Controls how the widget expands to fill space, and how the space around them is used.
   * @param padding Padding that is added on either side of the widget. This is different to spacing set when the box is created (or with set_spacing()) - spacing is added between objects, and padding is added on either side of an object.
   */
  void pack_end(Widget& child, PackOptions options = PACK_EXPAND_WIDGET, guint padding = 0);

  _WRAP_METHOD(void set_homogeneous(bool homogeneous = true), gtk_box_set_homogeneous)
  _WRAP_METHOD(bool get_homogeneous() const, gtk_box_get_homogeneous)

  _WRAP_METHOD(void set_spacing(int spacing), gtk_box_set_spacing)
  _WRAP_METHOD(int get_spacing() const, gtk_box_get_spacing)

  _WRAP_METHOD(void reorder_child(Widget& child, int pos), gtk_box_reorder_child)

  /* Get the child widgets.
   * @result An STL-style container of pointers to the box's child widgets.
   */
  BoxList& children();

  /* Get the child widgets.
   * @result An STL-style container of pointers to the box's child widgets.
   */
  const BoxList& children() const;

  _WRAP_PROPERTY("spacing", int)
  _WRAP_PROPERTY("homogeneous", bool)

protected:
#ifndef DOXYGEN_SHOULD_SKIP_THIS
  mutable BoxList children_proxy_;
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
};


/** Vertical Box for laying widgets in a vertical row.
 *
 * You should create these objects, but it is more confortable to pass
 * around pointers of Gtk::Box. All the methods that do anything are in
 * class Gtk::Box and this allows you to later change the direction of the
 * box, when there's no dependencies to HBox and VBox classes.
 *
 * @ingroup Widgets
 * @ingroup Containers
 */
class VBox : public Box
{
  _CLASS_GTKOBJECT(VBox,GtkVBox,GTK_VBOX,Gtk::Box,GtkBox)
public:

  /** Creates a new vertical box.
   * @param homogeneous Whether each widget in the VBox should have the same
   * height.  If set, a PACK_SHRINK argument to pack_start() or pack_end() is
   * ignored.
   * @param spacing Determines the space in pixels between child widgets.
   */
  _WRAP_CTOR(VBox(bool homogeneous = false, int spacing = 0), gtk_vbox_new)
  
};

/** Horizontal Box for laying widgets in a horizontal row.
 *
 * You should create these objects, but it is more confortable to pass
 * around pointers of Gtk::Box. All the methods that do anything are in
 * class Gtk::Box and this allows you to later change the direction of the
 * box, when there's no dependencies to HBox and VBox classes.
 *
 * Use the Gtk::Box packing interface to determine the arrangement, spacing,
 * width, and alignment of Gtk::HBox children.
 *
 * All children are allocated the same height.
 *
 * @ingroup Widgets
 * @ingroup Containers
 */
class HBox : public Box
{
  _CLASS_GTKOBJECT(HBox,GtkHBox,GTK_HBOX,Gtk::Box,GtkBox)
public:

  /** Creates a new horizontal box.
   * @param homogeneous Whether each widget in the HBox should have the same
   * width.  If set, a PACK_SHRINK argument to pack_start() or pack_end() is
   * ignored.
   * @param spacing Determines the space in pixels between child widgets.
   */
  _WRAP_CTOR(HBox(bool homogeneous = false, int spacing = 0), gtk_hbox_new)

};

} // namespace Gtk