/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * 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/>.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

/**
 * SECTION:gtkmenubar
 * @Title: GtkMenuBar
 * @Short_description: A subclass of GtkMenuShell which holds GtkMenuItem widgets
 * @See_also: #GtkMenuShell, #GtkMenu, #GtkMenuItem
 *
 * The #GtkMenuBar is a subclass of #GtkMenuShell which contains one or
 * more #GtkMenuItems. The result is a standard menu bar which can hold
 * many menu items.
 *
 * # CSS nodes
 *
 * GtkMenuBar has a single CSS node with name menubar.
 */

#include "config.h"

#include "gtkmenubar.h"

#include "gtkbindings.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkmenuitemprivate.h"
#include "gtkmenuprivate.h"
#include "gtkmenushellprivate.h"
#include "gtksettings.h"
#include "gtksizerequest.h"
#include "gtkwindow.h"
#include "gtkcontainerprivate.h"
#include "gtkcheckmenuitem.h"
#include "gtkintl.h"
#include "gtkprivate.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include "gtkbox.h"

#define MENU_BAR_POPUP_DELAY 0


typedef struct _GtkMenuBarPrivate  GtkMenuBarPrivate;
typedef struct _GtkMenuBarClass    GtkMenuBarClass;

struct _GtkMenuBar
{
  GtkMenuShell menu_shell;

  int toggle_size;
  GtkWidget *box;
};

struct _GtkMenuBarClass
{
  GtkMenuShellClass parent_class;
};

static void gtk_menu_bar_add    (GtkContainer *container,
                                 GtkWidget    *widget);
static void gtk_menu_bar_remove (GtkContainer *container,
                                 GtkWidget    *widget);

static void gtk_menu_bar_measure (GtkWidget     *widget,
                                  GtkOrientation  orientation,
                                  int             for_size,
                                  int            *minimum,
                                  int            *natural,
                                  int            *minimum_baseline,
                                  int            *natural_baseline);
static void gtk_menu_bar_size_allocate     (GtkWidget *widget,
                                            int        width,
                                            int        height,
                                            int        baseline);
static void gtk_menu_bar_root              (GtkWidget *widget);
static void gtk_menu_bar_unroot            (GtkWidget *widget);
static gint gtk_menu_bar_get_popup_delay   (GtkMenuShell    *menu_shell);
static void gtk_menu_bar_move_current      (GtkMenuShell     *menu_shell,
                                            GtkMenuDirectionType direction);
static void gtk_menu_bar_insert            (GtkMenuShell *menu_shell,
                                            GtkWidget    *child,
                                            gint          position);

G_DEFINE_TYPE (GtkMenuBar, gtk_menu_bar, GTK_TYPE_MENU_SHELL)

static GList *
gtk_menu_bar_get_items (GtkMenuShell *menu_shell)
{
  GtkMenuBar *menu_bar = GTK_MENU_BAR (menu_shell);

  return gtk_container_get_children (GTK_CONTAINER (menu_bar->box));
}

static void
gtk_menu_bar_class_init (GtkMenuBarClass *class)
{
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (class);
  GtkMenuShellClass *menu_shell_class = GTK_MENU_SHELL_CLASS (class);

  GtkBindingSet *binding_set;

  widget_class->measure = gtk_menu_bar_measure;
  widget_class->size_allocate = gtk_menu_bar_size_allocate;
  widget_class->root = gtk_menu_bar_root;
  widget_class->unroot = gtk_menu_bar_unroot;

  container_class->add = gtk_menu_bar_add;
  container_class->remove = gtk_menu_bar_remove;

  menu_shell_class->insert = gtk_menu_bar_insert;
  menu_shell_class->submenu_placement = GTK_TOP_BOTTOM;
  menu_shell_class->get_popup_delay = gtk_menu_bar_get_popup_delay;
  menu_shell_class->move_current = gtk_menu_bar_move_current;
  menu_shell_class->get_items = gtk_menu_bar_get_items;

  binding_set = gtk_binding_set_by_class (class);
  gtk_binding_entry_add_signal (binding_set,
				GDK_KEY_Left, 0,
				"move-current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_PREV);
  gtk_binding_entry_add_signal (binding_set,
				GDK_KEY_KP_Left, 0,
				"move-current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_PREV);
  gtk_binding_entry_add_signal (binding_set,
				GDK_KEY_Right, 0,
				"move-current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_NEXT);
  gtk_binding_entry_add_signal (binding_set,
				GDK_KEY_KP_Right, 0,
				"move-current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_NEXT);
  gtk_binding_entry_add_signal (binding_set,
				GDK_KEY_Up, 0,
				"move-current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_PARENT);
  gtk_binding_entry_add_signal (binding_set,
				GDK_KEY_KP_Up, 0,
				"move-current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_PARENT);
  gtk_binding_entry_add_signal (binding_set,
				GDK_KEY_Down, 0,
				"move-current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_CHILD);
  gtk_binding_entry_add_signal (binding_set,
				GDK_KEY_KP_Down, 0,
				"move-current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_CHILD);

  gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_MENU_BAR);
  gtk_widget_class_set_css_name (widget_class, I_("menubar"));
}

static void
gtk_menu_bar_init (GtkMenuBar *menu_bar)
{
  menu_bar->box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
  gtk_widget_set_parent (menu_bar->box, GTK_WIDGET (menu_bar));
}

/**
 * gtk_menu_bar_new:
 *
 * Creates a new #GtkMenuBar
 *
 * Returns: the new menu bar, as a #GtkWidget
 */
GtkWidget*
gtk_menu_bar_new (void)
{
  return g_object_new (GTK_TYPE_MENU_BAR, NULL);
}

static void
gtk_menu_bar_measure (GtkWidget      *widget,
                      GtkOrientation  orientation,
                      int             for_size,
                      int            *minimum,
                      int            *natural,
                      int            *minimum_baseline,
                      int            *natural_baseline)
{
  GtkMenuBar *menu_bar = GTK_MENU_BAR (widget);

  gtk_widget_measure (menu_bar->box,
                      orientation,
                      for_size,
                      minimum, natural,
                      minimum_baseline, natural_baseline);
}

static void
gtk_menu_bar_size_allocate (GtkWidget *widget,
                            int        width,
                            int        height,
                            int        baseline)
{
  GtkMenuBar *menu_bar = GTK_MENU_BAR (widget);

  gtk_widget_size_allocate (menu_bar->box,
                            &(GtkAllocation) { 0, 0, width, height },
                            baseline);
}

static GList *
get_menu_bars (GtkWindow *window)
{
  return g_object_get_data (G_OBJECT (window), "gtk-menu-bar-list");
}

GList *
_gtk_menu_bar_get_viewable_menu_bars (GtkWindow *window)
{
  GList *menu_bars;
  GList *viewable_menu_bars = NULL;

  for (menu_bars = get_menu_bars (window);
       menu_bars;
       menu_bars = menu_bars->next)
    {
      GtkWidget *widget = menu_bars->data;
      gboolean viewable = TRUE;
      
      while (widget)
	{
	  if (!gtk_widget_get_mapped (widget))
	    viewable = FALSE;

          widget = gtk_widget_get_parent (widget);
	}

      if (viewable)
	viewable_menu_bars = g_list_prepend (viewable_menu_bars, menu_bars->data);
    }

  return g_list_reverse (viewable_menu_bars);
}

static void
set_menu_bars (GtkWindow *window,
	       GList     *menubars)
{
  g_object_set_data (G_OBJECT (window), I_("gtk-menu-bar-list"), menubars);
}

static void
add_to_window (GtkWindow  *window,
               GtkMenuBar *menubar)
{
  GList *menubars = get_menu_bars (window);

  set_menu_bars (window, g_list_prepend (menubars, menubar));
}

static void
remove_from_window (GtkWindow  *window,
                    GtkMenuBar *menubar)
{
  GList *menubars = get_menu_bars (window);

  menubars = g_list_remove (menubars, menubar);
  set_menu_bars (window, menubars);
}

static void
gtk_menu_bar_root (GtkWidget *widget)
{
  GtkMenuBar *menubar = GTK_MENU_BAR (widget);
  GtkWidget *toplevel;  

  GTK_WIDGET_CLASS (gtk_menu_bar_parent_class)->root (widget);

  toplevel = GTK_WIDGET (gtk_widget_get_root (widget));
  add_to_window (GTK_WINDOW (toplevel), menubar);
}

static void
gtk_menu_bar_unroot (GtkWidget *widget)
{
  GtkMenuBar *menubar = GTK_MENU_BAR (widget);
  GtkWidget *toplevel;

  toplevel = GTK_WIDGET (gtk_widget_get_root (widget));
  remove_from_window (GTK_WINDOW (toplevel), menubar);

  GTK_WIDGET_CLASS (gtk_menu_bar_parent_class)->unroot (widget);
}

/**
 * _gtk_menu_bar_cycle_focus:
 * @menubar: a #GtkMenuBar
 * @dir: direction in which to cycle the focus
 * 
 * Move the focus between menubars in the toplevel.
 **/
void
_gtk_menu_bar_cycle_focus (GtkMenuBar       *menubar,
			   GtkDirectionType  dir)
{
  GtkWidget *toplevel = GTK_WIDGET (gtk_widget_get_root (GTK_WIDGET (menubar)));
  GtkMenuItem *to_activate = NULL;

  if (GTK_IS_WINDOW (toplevel))
    {
      GList *tmp_menubars = _gtk_menu_bar_get_viewable_menu_bars (GTK_WINDOW (toplevel));
      GList *l;
      GPtrArray *menubars;
      gboolean found;
      guint index;

      menubars = g_ptr_array_sized_new (g_list_length (tmp_menubars));

      for (l = tmp_menubars; l; l = l->next)
        g_ptr_array_add (menubars, l->data);

      gtk_widget_focus_sort (toplevel, dir, menubars);

      found = g_ptr_array_find (menubars, menubar, &index);

      if (found && index < menubars->len - 1)
        {
          GtkWidget *next = g_ptr_array_index (menubars, index + 1);
          GtkMenuShell *new_menushell = GTK_MENU_SHELL (next);
          GList *children = gtk_menu_shell_get_items (new_menushell);

          if (children)
            to_activate = children->data;
          g_list_free (children);
        }

      g_ptr_array_free (menubars, TRUE);
    }

  gtk_menu_shell_cancel (GTK_MENU_SHELL (menubar));

  if (to_activate)
    g_signal_emit_by_name (to_activate, "activate_item");
}

static gint
gtk_menu_bar_get_popup_delay (GtkMenuShell *menu_shell)
{
  return MENU_BAR_POPUP_DELAY;
}

static void
gtk_menu_bar_move_current (GtkMenuShell         *menu_shell,
			   GtkMenuDirectionType  direction)
{
  GtkMenuBar *menubar = GTK_MENU_BAR (menu_shell);

  if (gtk_widget_get_direction (GTK_WIDGET (menubar)) == GTK_TEXT_DIR_RTL)
    {
      switch (direction) 
        {      
        case GTK_MENU_DIR_PREV:
          direction = GTK_MENU_DIR_NEXT;
          break;
        case GTK_MENU_DIR_NEXT:
          direction = GTK_MENU_DIR_PREV;
          break;
        case GTK_MENU_DIR_PARENT:
        case GTK_MENU_DIR_CHILD:
        default:
          break;
        }
    }
  
  GTK_MENU_SHELL_CLASS (gtk_menu_bar_parent_class)->move_current (menu_shell, direction);
}

/**
 * gtk_menu_bar_new_from_model:
 * @model: a #GMenuModel
 *
 * Creates a new #GtkMenuBar and populates it with menu items
 * and submenus according to @model.
 *
 * The created menu items are connected to actions found in the
 * #GtkApplicationWindow to which the menu bar belongs - typically
 * by means of being contained within the #GtkApplicationWindows
 * widget hierarchy.
 *
 * Returns: a new #GtkMenuBar
 */
GtkWidget *
gtk_menu_bar_new_from_model (GMenuModel *model)
{
  GtkWidget *menubar;

  g_return_val_if_fail (G_IS_MENU_MODEL (model), NULL);

  menubar = gtk_menu_bar_new ();
  gtk_menu_shell_bind_model (GTK_MENU_SHELL (menubar), model, NULL, FALSE);

  return menubar;
}

static void
gtk_menu_bar_add (GtkContainer *container,
                  GtkWidget    *widget)
{
  GtkMenuBar *menu_bar = GTK_MENU_BAR (container);

  gtk_container_add (GTK_CONTAINER (menu_bar->box), widget);
}

static void
gtk_menu_bar_remove (GtkContainer *container,
                     GtkWidget    *widget)
{
  GtkMenuBar *menu_bar = GTK_MENU_BAR (container);

  gtk_container_remove (GTK_CONTAINER (menu_bar->box), widget);

  GTK_CONTAINER_CLASS (gtk_menu_bar_parent_class)->remove (container, widget);
}

static void
gtk_menu_bar_reorder_child (GtkMenuBar *menu_bar,
                            GtkWidget  *child,
                            gint        position)
{
  GtkWidget *sibling = NULL;
  int i;

  if (position < 0)
    sibling = gtk_widget_get_last_child (menu_bar->box);

  for (i = 0; i < position; i++)
    {
      if (sibling == NULL)
        sibling = gtk_widget_get_first_child (menu_bar->box);
      else
        sibling = gtk_widget_get_next_sibling (sibling);
    }

  gtk_box_reorder_child_after (GTK_BOX (menu_bar->box), child, sibling);
}

static void
gtk_menu_bar_insert (GtkMenuShell *menu_shell,
                     GtkWidget    *child,
                     gint          position)
{
  GtkMenuBar *menu_bar = GTK_MENU_BAR (menu_shell);

  gtk_container_add (GTK_CONTAINER (menu_bar->box), child);
  gtk_menu_bar_reorder_child (menu_bar, child, position);
}