// -*- c++ -*-
/* $Id: menushell.ccg,v 1.5 2006/05/11 11:40:24 murrayc Exp $ */

/* Copyright 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <gtk/gtk.h>


namespace Gtk
{

// All ctors are manually implemented just to initialize accel_window_.

MenuShell::MenuShell()
:
  _CONSTRUCT_SPECIFIC(Gtk::Container, MenuShell),
  items_proxy_  (gobj()),
  accel_window_ (0)
{}

MenuShell::MenuShell(const Glib::ConstructParams& construct_params)
:
  Glib::ObjectBase(0),
  Gtk::Container  (construct_params),
  items_proxy_    (gobj()),
  accel_window_   (0)
{}

MenuShell::MenuShell(GtkMenuShell* castitem)
:
  Gtk::Container((GtkContainer*) castitem),
  items_proxy_  (gobj()),
  accel_window_ (0)
{}

// TODO: Why do we need a custom dtor?
MenuShell::~MenuShell()
{}

void MenuShell::accelerate(Window& window)
{
  // accel_window_ is used by menuitems that are added to the menushell
  // after it has been accelerated.
  accel_window_ = &window;

  const MenuList::iterator items_end = items().end();

  for(MenuList::iterator iter = items().begin(); iter != items_end; ++iter)
    iter->accelerate(window);
}

void MenuShell::accelerate(Widget& parent)
{
  Gtk::Window* toplevel_window 
      = dynamic_cast<Gtk::Window*>(parent.get_toplevel());
  if(toplevel_window)
    accelerate(*toplevel_window);
}

MenuShell::MenuList& MenuShell::items()
{
  return items_proxy_;
}

const MenuShell::MenuList& MenuShell::items() const
{
  return items_proxy_;
}

void MenuShell_Class::insert_vfunc_callback(GtkMenuShell* self, GtkWidget* child, int position)
{
  #ifdef GLIBMM_EXCEPTIONS_ENABLED
  try
  {
  #endif //GLIBMM_EXCEPTIONS_ENABLED
    MenuShell *const obj = dynamic_cast<MenuShell*>(
        Glib::ObjectBase::_get_current_wrapper((GObject*) self));

    // If MenuShell is accelerated initialize accelerators of new MenuItem.
    if(obj && obj->accel_window_ && GTK_IS_MENU_ITEM(child))
    {
      Glib::wrap((GtkMenuItem*) child)->accelerate(*obj->accel_window_);
    }
  #ifdef GLIBMM_EXCEPTIONS_ENABLED
  }
  catch(...)
  {
    Glib::exception_handlers_invoke();
  }
  #endif //GLIBMM_EXCEPTIONS_ENABLED

  GtkMenuShellClass *const base = static_cast<GtkMenuShellClass*>(
      g_type_class_peek_parent(G_OBJECT_GET_CLASS(self)));

  if(base && base->insert)
    (*base->insert)(self, child, position);
}


namespace Menu_Helpers
{

// List implementation:


MenuList::iterator MenuList::insert(MenuList::iterator position, const Element& element)
{
  const Glib::RefPtr<Gtk::MenuItem> item = element.get_child();

  g_return_val_if_fail(item != 0, position);
  g_return_val_if_fail(gparent() != 0, position);

  int pos = -1;

  if(position.node_)
    pos = g_list_position(glist(), position.node_);

  gtk_menu_shell_insert(gparent(), item->Widget::gobj(), pos);

  return --position;
}

void MenuList::remove(const_reference child)
{
  const Widget& widget = child;
  remove(const_cast<Widget&>(widget));
}

void MenuList::remove(Widget& widget)
{
  //This is the same as the standard implementation,
  //but we also unset the accel_label to avoid leaking its reference.

  //If it is a Bin, (actually we're looking for a MenuItem):
  if(GTK_IS_BIN(widget.gobj()))
  {
    //TODO: There is duplication here, with erase().
    //If the child's child is an AccelLabel then unset its accel widget:
    //This can't catch every possible AccelLabel in the hierarchy, but it
    //will catch the ones that we create in MenuItem::MenuItem() without
    //people being aware of it. People can take care of their own ones themselves.
    Gtk::AccelLabel* pAccelLabel = dynamic_cast<Gtk::AccelLabel*>(dynamic_cast<Gtk::Bin&>(widget).get_child());
    if(pAccelLabel) //If the child is an AccelLabel.
    {
      //The unset_accel_widget() method is not implemented in gtkmm until 2.4:
      gtk_accel_label_set_accel_widget(pAccelLabel->gobj(), 0);
    }
  }

  gtk_container_remove(GTK_CONTAINER(gparent_),
                       (GtkWidget*)(widget.gobj()));
}

MenuList::iterator MenuList::erase(iterator position)
{
  //Check that it is a valid iterator, to a real item:
  if ( !position.node_|| (position == end()) )
    return end();

  //Get an iterator the the next item, to return:
  iterator next = position;
  next++;

  GtkWidget* pChild = (GtkWidget*)(position->gobj());
  if(GTK_IS_BIN(pChild)) //A MenuItem is a Bin.
  {  
    //If the child's child is an AccelLabel then unset it's accel widget:
    //This can't catch every possible AccelLabel in the hierarchy, but it
    //will catch the ones that we create in MenuItem::MenuItem() without
    //people being aware of it. People can take care of their own ones themselves.
    GtkWidget* pChildOfChild = (GtkWidget*)gtk_bin_get_child(GTK_BIN(pChild));
    if(GTK_IS_ACCEL_LABEL(pChildOfChild))
       gtk_accel_label_set_accel_widget(GTK_ACCEL_LABEL(pChildOfChild), 0);
  }
  
  //Use GTK+ C function to remove it, by providing the GtkWidget*:
  gtk_container_remove( GTK_CONTAINER(gparent_), pChild );
  
  return next;
}

} // namespace Menu_Helpers

} // namespace Gtk

