gtknotebook.c 82.1 KB
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/* 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 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
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 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
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 */
#include "gtknotebook.h"
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#include "gtksignal.h"
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#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtklabel.h"
#include <gdk/gdkkeysyms.h>
#include <stdio.h>
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#define TAB_OVERLAP    2
#define TAB_CURVATURE  1
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#define ARROW_SIZE     11
#define ARROW_SPACING  3
#define NOTEBOOK_INIT_SCROLL_DELAY (200)
#define NOTEBOOK_SCROLL_DELAY      (100)
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enum {
  SWITCH_PAGE,
  LAST_SIGNAL
};

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enum {
  STEP_PREV,
  STEP_NEXT
};

typedef void (*GtkNotebookSignal) (GtkObject       *object,
				   GtkNotebookPage *arg1,
				   gint             arg2,
				   gpointer         data);

static void gtk_notebook_class_init          (GtkNotebookClass *klass);
static void gtk_notebook_init                (GtkNotebook      *notebook);
static void gtk_notebook_destroy             (GtkObject        *object);
static void gtk_notebook_map                 (GtkWidget        *widget);
static void gtk_notebook_unmap               (GtkWidget        *widget);
static void gtk_notebook_realize             (GtkWidget        *widget);
static void gtk_notebook_panel_realize       (GtkNotebook      *notebook);
static void gtk_notebook_size_request        (GtkWidget        *widget,
					      GtkRequisition   *requisition);
static void gtk_notebook_size_allocate       (GtkWidget        *widget,
					      GtkAllocation    *allocation);
static void gtk_notebook_paint               (GtkWidget        *widget,
					      GdkRectangle     *area);
static void gtk_notebook_draw                (GtkWidget        *widget,
					      GdkRectangle     *area);
static gint gtk_notebook_expose              (GtkWidget        *widget,
					      GdkEventExpose   *event);
static gint gtk_notebook_button_press        (GtkWidget        *widget,
					      GdkEventButton   *event);
static gint gtk_notebook_button_release      (GtkWidget        *widget,
					      GdkEventButton   *event);
static gint gtk_notebook_enter_notify        (GtkWidget        *widget,
					      GdkEventCrossing *event);
static gint gtk_notebook_leave_notify        (GtkWidget        *widget,
					      GdkEventCrossing *event);
static gint gtk_notebook_motion_notify       (GtkWidget        *widget,
					      GdkEventMotion   *event);
static gint gtk_notebook_key_press           (GtkWidget        *widget,
					      GdkEventKey      *event);
static void gtk_notebook_add                 (GtkContainer     *container,
					      GtkWidget        *widget);
static void gtk_notebook_remove              (GtkContainer     *container,
					      GtkWidget        *widget);
static void gtk_notebook_real_remove         (GtkNotebook      *notebook,
					      GList            *list,
					      gint              page_num);
static void gtk_notebook_foreach             (GtkContainer     *container,
					      GtkCallback       callback,
					      gpointer          callback_data);
static void gtk_notebook_switch_page         (GtkNotebook      *notebook,
					      GtkNotebookPage  *page,
					      gint              page_num);
static void gtk_notebook_draw_tab            (GtkNotebook      *notebook,
					      GtkNotebookPage  *page,
					      GdkRectangle     *area);
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static void gtk_notebook_set_focus_child     (GtkContainer     *container,
					      GtkWidget        *child);
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static gint gtk_notebook_focus_in            (GtkWidget        *widget,
					      GdkEventFocus    *event);
static gint gtk_notebook_focus_out           (GtkWidget        *widget,
					      GdkEventFocus    *event);
static void gtk_notebook_draw_focus          (GtkWidget        *widget);
static void gtk_notebook_focus_changed       (GtkNotebook      *notebook, 
					      GtkNotebookPage  *old_page);
static void gtk_notebook_pages_allocate      (GtkNotebook      *notebook,
					      GtkAllocation    *allocation);
static void gtk_notebook_page_allocate       (GtkNotebook      *notebook,
					      GtkNotebookPage  *page,
					      GtkAllocation    *allocation);
static void gtk_notebook_draw_arrow          (GtkNotebook      *notebook, 
					      guint             arrow);
static gint gtk_notebook_timer               (GtkNotebook      *notebook);
static gint gtk_notebook_focus               (GtkContainer     *container,
					      GtkDirectionType  direction);
static gint gtk_notebook_page_select         (GtkNotebook      *notebook);
static void gtk_notebook_calc_tabs           (GtkNotebook      *notebook, 
			                      GList            *start, 
					      GList           **end,
					      gint             *tab_space,
					      guint             direction);
static void gtk_notebook_expose_tabs         (GtkNotebook      *notebook);
static void gtk_notebook_switch_focus_tab    (GtkNotebook      *notebook, 
                                              GList            *new_child);
static void gtk_real_notebook_switch_page    (GtkNotebook      *notebook,
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					      GtkNotebookPage  *page,
					      gint              page_num);
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static void gtk_notebook_marshal_signal      (GtkObject        *object,
					      GtkSignalFunc     func,
					      gpointer          func_data,
					      GtkArg           *args);
static void gtk_notebook_menu_switch_page    (GtkWidget        *widget,
					      GtkNotebookPage  *page);
static void gtk_notebook_update_labels       (GtkNotebook      *notebook,
					      GList            *list,
					      gint              page_num);
static void gtk_notebook_menu_detacher       (GtkWidget        *widget,
					      GtkMenu          *menu);
static void gtk_notebook_menu_label_unparent (GtkWidget        *widget, 
					      gpointer          data);
static void gtk_notebook_menu_item_create    (GtkNotebook      *notebook, 
					      GtkNotebookPage  *page,
					      gint              position);

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static GtkContainerClass *parent_class = NULL;
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static guint notebook_signals[LAST_SIGNAL] = { 0 };
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guint
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gtk_notebook_get_type (void)
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{
  static guint notebook_type = 0;

  if (!notebook_type)
    {
      GtkTypeInfo notebook_info =
      {
	"GtkNotebook",
	sizeof (GtkNotebook),
	sizeof (GtkNotebookClass),
	(GtkClassInitFunc) gtk_notebook_class_init,
	(GtkObjectInitFunc) gtk_notebook_init,
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	(GtkArgSetFunc) NULL,
        (GtkArgGetFunc) NULL,
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      };

      notebook_type = gtk_type_unique (gtk_container_get_type (), &notebook_info);
    }

  return notebook_type;
}

static void
gtk_notebook_class_init (GtkNotebookClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;

  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  container_class = (GtkContainerClass*) class;

  parent_class = gtk_type_class (gtk_container_get_type ());

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  notebook_signals[SWITCH_PAGE] =
    gtk_signal_new ("switch_page",
                    GTK_RUN_LAST,
                    object_class->type,
                    GTK_SIGNAL_OFFSET (GtkNotebookClass, switch_page),
                    gtk_notebook_marshal_signal,
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                    GTK_TYPE_NONE, 2,
		    GTK_TYPE_POINTER,
		    GTK_TYPE_INT);
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  gtk_object_class_add_signals (object_class, notebook_signals, LAST_SIGNAL);

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  object_class->destroy = gtk_notebook_destroy;

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  widget_class->map = gtk_notebook_map;
  widget_class->unmap = gtk_notebook_unmap;
  widget_class->realize = gtk_notebook_realize;
  widget_class->size_request = gtk_notebook_size_request;
  widget_class->size_allocate = gtk_notebook_size_allocate;
  widget_class->draw = gtk_notebook_draw;
  widget_class->expose_event = gtk_notebook_expose;
  widget_class->button_press_event = gtk_notebook_button_press;
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  widget_class->button_release_event = gtk_notebook_button_release;
  widget_class->enter_notify_event = gtk_notebook_enter_notify;
  widget_class->leave_notify_event = gtk_notebook_leave_notify;
  widget_class->motion_notify_event = gtk_notebook_motion_notify;
  widget_class->key_press_event = gtk_notebook_key_press;
  widget_class->focus_in_event = gtk_notebook_focus_in;
  widget_class->focus_out_event = gtk_notebook_focus_out;
  widget_class->draw_focus = gtk_notebook_draw_focus;
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  container_class->add = gtk_notebook_add;
  container_class->remove = gtk_notebook_remove;
  container_class->foreach = gtk_notebook_foreach;
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  container_class->focus = gtk_notebook_focus;
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  container_class->set_focus_child = gtk_notebook_set_focus_child;
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  class->switch_page = gtk_real_notebook_switch_page;
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}

static void
gtk_notebook_init (GtkNotebook *notebook)
{
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  GTK_WIDGET_SET_FLAGS (notebook, GTK_CAN_FOCUS);

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  notebook->cur_page = NULL;
  notebook->children = NULL;
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  notebook->first_tab = NULL;
  notebook->focus_tab = NULL;
  notebook->panel = NULL;
  notebook->menu = NULL;

  notebook->tab_border = 3;
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  notebook->show_tabs = TRUE;
  notebook->show_border = TRUE;
  notebook->tab_pos = GTK_POS_TOP;
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  notebook->scrollable = FALSE;
  notebook->in_child = 0;
  notebook->click_child = 0;
  notebook->button = 0;
  notebook->need_timer = 0;
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  notebook->child_has_focus = FALSE;
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}

GtkWidget*
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gtk_notebook_new (void)
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{
  return GTK_WIDGET (gtk_type_new (gtk_notebook_get_type ()));
}

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static void
gtk_notebook_destroy (GtkObject *object)
{
  GtkNotebook *notebook;
  
  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (object));

  notebook = GTK_NOTEBOOK (object);

  if (notebook->menu)
    gtk_notebook_popup_disable (notebook);

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  GTK_OBJECT_CLASS (parent_class)->destroy (object);
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}

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void
gtk_notebook_append_page (GtkNotebook *notebook,
			  GtkWidget   *child,
			  GtkWidget   *tab_label)
{
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));
  g_return_if_fail (child != NULL);

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  gtk_notebook_insert_page_menu (notebook, child, tab_label, NULL, -1);
}

void
gtk_notebook_append_page_menu (GtkNotebook *notebook,
			       GtkWidget   *child,
			       GtkWidget   *tab_label,
			       GtkWidget   *menu_label)
{
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));
  g_return_if_fail (child != NULL);

  gtk_notebook_insert_page_menu (notebook, child, tab_label, menu_label, -1);
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}

void
gtk_notebook_prepend_page (GtkNotebook *notebook,
			   GtkWidget   *child,
			   GtkWidget   *tab_label)
{
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));
  g_return_if_fail (child != NULL);

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  gtk_notebook_insert_page_menu (notebook, child, tab_label, NULL, 0);
}

void
gtk_notebook_prepend_page_menu (GtkNotebook *notebook,
				GtkWidget   *child,
				GtkWidget   *tab_label,
				GtkWidget   *menu_label)
{
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));
  g_return_if_fail (child != NULL);

  gtk_notebook_insert_page_menu (notebook, child, tab_label, menu_label, 0);
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}

void
gtk_notebook_insert_page (GtkNotebook *notebook,
			  GtkWidget   *child,
			  GtkWidget   *tab_label,
			  gint         position)
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{
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));
  g_return_if_fail (child != NULL);

  gtk_notebook_insert_page_menu (notebook, child, tab_label, NULL, position);
}

void
gtk_notebook_insert_page_menu (GtkNotebook *notebook,
			       GtkWidget   *child,
			       GtkWidget   *tab_label,
			       GtkWidget   *menu_label,
			       gint         position)
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{
  GtkNotebookPage *page;
  gint nchildren;

  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));
  g_return_if_fail (child != NULL);

  page = g_new (GtkNotebookPage, 1);
  page->child = child;
  page->requisition.width = 0;
  page->requisition.height = 0;
  page->allocation.x = 0;
  page->allocation.y = 0;
  page->allocation.width = 0;
  page->allocation.height = 0;
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  page->default_menu = FALSE;
  page->default_tab = FALSE;
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  nchildren = g_list_length (notebook->children);
  if ((position < 0) || (position > nchildren))
    position = nchildren;

  notebook->children = g_list_insert (notebook->children, page, position);

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  if (!tab_label)
    {
      page->default_tab = TRUE;
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      if (notebook->show_tabs)
	tab_label = gtk_label_new ("");
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    }
  page->tab_label = tab_label;
  page->menu_label = menu_label;

  if (!menu_label)
    page->default_menu = TRUE;
  else  
    {
      gtk_widget_ref (page->menu_label);
      gtk_object_sink (GTK_OBJECT(page->menu_label));
    }

  if (notebook->menu)
    gtk_notebook_menu_item_create (notebook, page, position);

  gtk_notebook_update_labels 
    (notebook, g_list_nth (notebook->children, position), position + 1);

  if (!notebook->first_tab)
    notebook->first_tab = notebook->children;

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  gtk_widget_set_parent (child, GTK_WIDGET (notebook));
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  if (tab_label)
    {
      gtk_widget_set_parent (tab_label, GTK_WIDGET (notebook));
      gtk_widget_show (tab_label);
    }
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  if (!notebook->cur_page)
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    {
      gtk_notebook_switch_page (notebook, page, 0);
      notebook->focus_tab = NULL;
    }
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  if (GTK_WIDGET_VISIBLE (notebook))
    {
      if (GTK_WIDGET_REALIZED (notebook) &&
	  !GTK_WIDGET_REALIZED (child))
	gtk_widget_realize (child);
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      if (GTK_WIDGET_MAPPED (notebook) &&
	  !GTK_WIDGET_MAPPED (child) && notebook->cur_page == page)
	gtk_widget_map (child);

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      if (tab_label)
	{
	  if (GTK_WIDGET_REALIZED (notebook) &&
	      !GTK_WIDGET_REALIZED (tab_label))
	    gtk_widget_realize (tab_label);
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	  if (GTK_WIDGET_MAPPED (notebook) &&
	      !GTK_WIDGET_MAPPED (tab_label))
	    gtk_widget_map (tab_label);
	}
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    }

  if (GTK_WIDGET_VISIBLE (child) && GTK_WIDGET_VISIBLE (notebook))
    gtk_widget_queue_resize (child);
}

void
gtk_notebook_remove_page (GtkNotebook *notebook,
			  gint         page_num)
{
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  GList *list;
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  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));

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  if ((list = g_list_nth (notebook->children, page_num)))
    gtk_notebook_real_remove (notebook, list, page_num);
}

static void
gtk_notebook_add (GtkContainer *container,
		  GtkWidget    *widget)
{
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (container));
  g_return_if_fail (widget != NULL);

  gtk_notebook_insert_page_menu (GTK_NOTEBOOK (container), widget, 
				 NULL, NULL, -1);
}

static void
gtk_notebook_remove (GtkContainer *container,
		     GtkWidget    *widget)
{
  GtkNotebook *notebook;
  GtkNotebookPage *page;
  GList *children;
  gint page_num;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (container));
  g_return_if_fail (widget != NULL);

  notebook = GTK_NOTEBOOK (container);

  children = notebook->children;
  page_num = 0;
  while (children)
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    {
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      page = children->data;
      if (page->child == widget)
	{
	  gtk_notebook_real_remove (notebook, children, page_num);
	  break;
	}
      page_num++;
      children = children->next;
    }
}
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static void
gtk_notebook_real_remove (GtkNotebook *notebook,
			  GList        *list,
			  gint          page_num)
{
  GtkNotebookPage *page;
  GList * next_list;
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  gint need_resize = FALSE;
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  if (list->prev)
    {
      next_list = list->prev;
      page_num--;
    }
  else if (list->next)
    {
      next_list = list->next;
      page_num++;
    }
  else 
    next_list = NULL;
  
  if (notebook->cur_page == list->data)
    { 
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      notebook->cur_page = NULL;
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      if (next_list)
	{
	  page = next_list->data;
	  gtk_notebook_switch_page (notebook, page, page_num);
	}
    }
  
  if (list == notebook->first_tab)
    notebook->first_tab = next_list;
  if (list == notebook->focus_tab)
    notebook->focus_tab = next_list;
  
  page = list->data;
  
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  if ((GTK_WIDGET_VISIBLE (page->child) || 
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       (page->tab_label && GTK_WIDGET_VISIBLE (page->tab_label))) 
       && GTK_WIDGET_VISIBLE (notebook))
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    need_resize = TRUE;

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  gtk_widget_unparent (page->child);
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  if (page->tab_label)
    gtk_widget_unparent (page->tab_label);
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  if (notebook->menu)
    {
      gtk_container_remove (GTK_CONTAINER (notebook->menu), 
			    page->menu_label->parent);
      gtk_widget_queue_resize (notebook->menu);
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    }
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  if (!page->default_menu)
    gtk_widget_unref (page->menu_label);
  
  gtk_notebook_update_labels (notebook, list->next, page_num + 1);
  
  notebook->children = g_list_remove_link (notebook->children, list);
  g_list_free (list);
  g_free (page);
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  if (need_resize)
    gtk_widget_queue_resize (GTK_WIDGET (notebook));

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}

gint
gtk_notebook_current_page (GtkNotebook *notebook)
{
  GList *children;
  gint cur_page;

  g_return_val_if_fail (notebook != NULL, -1);
  g_return_val_if_fail (GTK_IS_NOTEBOOK (notebook), -1);

  if (notebook->cur_page)
    {
      cur_page = 0;
      children = notebook->children;

      while (children)
	{
	  if (children->data == notebook->cur_page)
	    break;
	  children = children->next;
	  cur_page += 1;
	}

      if (!children)
	cur_page = -1;
    }
  else
    {
      cur_page = -1;
    }

  return cur_page;
}

void
gtk_notebook_set_page (GtkNotebook *notebook,
		       gint         page_num)
{
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  GList *list;
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  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));

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  if ((list = g_list_nth (notebook->children, page_num)))
      gtk_notebook_switch_page (notebook, 
				((GtkNotebookPage *)(list->data)), page_num);
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}

void
gtk_notebook_next_page (GtkNotebook *notebook)
{
  GtkNotebookPage *page;
  GList *children;
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  gint num;
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  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));

  children = notebook->children;
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  num = 0;
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  while (children)
    {
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      if (notebook->cur_page == children->data)
	break;
      children = children->next;
      num++;
    }
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  if (!children)
    return;
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  if (children->next)
    {
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      children = children->next;
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      num++;
    }
  else
    {
      children = notebook->children;
      num = 0;
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    }
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  page = children->data;
  gtk_notebook_switch_page (notebook, page, num);
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}

void
gtk_notebook_prev_page (GtkNotebook *notebook)
{
  GtkNotebookPage *page;
  GList *children;
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  gint num;
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  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));

  children = notebook->children;
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  num = 0;
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  while (children)
    {
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      if (notebook->cur_page == children->data)
	break;
      children = children->next;
      num++;
    }
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  if (!children)
    return;
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  if (children->prev)
    {
      children = children->prev;
      num--;
    }
  else
    {
      while (children->next)
	{
	  children = children->next;
	  num++;
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	}
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    }

  page = children->data;
  gtk_notebook_switch_page (notebook, page, num);
}
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static void
gtk_notebook_foreach (GtkContainer *container,
		      GtkCallback   callback,
		      gpointer      callback_data)
{
  GtkNotebook *notebook;
  GtkNotebookPage *page;
  GList *children;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (container));
  g_return_if_fail (callback != NULL);

  notebook = GTK_NOTEBOOK (container);

  children = notebook->children;
  while (children)
    {
      page = children->data;
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      children = children->next;
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      (* callback) (page->child, callback_data);
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    }
}

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static void
gtk_notebook_expose_tabs (GtkNotebook *notebook)
{
  GtkWidget *widget;
  GtkNotebookPage *page;
  GdkEventExpose event;
  gint border;

  widget = GTK_WIDGET (notebook);
  border = GTK_CONTAINER (notebook)->border_width;

  page = notebook->first_tab->data;

  event.type = GDK_EXPOSE;
  event.window = widget->window;
  event.count = 0;
  event.area.x = border;
  event.area.y = border;

  switch (notebook->tab_pos)
    {
    case GTK_POS_BOTTOM:
      event.area.y = widget->allocation.height - border 
	- page->allocation.height - widget->style->klass->ythickness;
      if (notebook->first_tab->data != notebook->cur_page)
	event.area.y -= widget->style->klass->ythickness;
    case GTK_POS_TOP:
      event.area.width = widget->allocation.width - 2 * border;
      event.area.height = page->allocation.height 
	+ widget->style->klass->ythickness;
      if (notebook->first_tab->data != notebook->cur_page)
	event.area.height += widget->style->klass->ythickness;
      break;
    case GTK_POS_RIGHT:
      event.area.x = widget->allocation.width - border 
	- page->allocation.width - widget->style->klass->xthickness;
      if (notebook->first_tab->data != notebook->cur_page)
	event.area.x -= widget->style->klass->xthickness;
    case GTK_POS_LEFT:
      event.area.width = page->allocation.width 
	+ widget->style->klass->xthickness;
      event.area.height = widget->allocation.height - 2 * border;
      if (notebook->first_tab->data != notebook->cur_page)
	event.area.width += widget->style->klass->xthickness;
      break;
    }	     
  gtk_widget_event (widget, (GdkEvent *) &event);
}

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void
gtk_notebook_set_tab_pos (GtkNotebook     *notebook,
			  GtkPositionType  pos)
{
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));

  if (notebook->tab_pos != pos)
    {
      notebook->tab_pos = pos;

      if (GTK_WIDGET_VISIBLE (notebook))
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	{
	  gtk_widget_queue_resize (GTK_WIDGET (notebook));
	  if (notebook->panel)
	    gdk_window_clear (notebook->panel);
	}
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    }
}

void
gtk_notebook_set_show_tabs (GtkNotebook *notebook,
			    gint         show_tabs)
{
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  GtkNotebookPage *page;
  GList *children;

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  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));

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  if (notebook->show_tabs == show_tabs)
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    return;

  notebook->show_tabs = show_tabs;
  children = notebook->children;

  if (!show_tabs)
    {
      GTK_WIDGET_UNSET_FLAGS (notebook, GTK_CAN_FOCUS);
      
      while (children)
	{
	  page = children->data;
	  children = children->next;
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	  if (page->default_tab)
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	    {
	      gtk_widget_destroy (page->tab_label);
	      page->tab_label = NULL;
	    }
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	  else
	    gtk_widget_hide (page->tab_label);
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	}
      
      if (notebook->panel)
	gdk_window_hide (notebook->panel);
    }
  else
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    {
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      gchar string[32];
      gint i = 1;
      
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      GTK_WIDGET_SET_FLAGS (notebook, GTK_CAN_FOCUS);
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      while (children)
	{
	  page = children->data;
	  children = children->next;
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	  if (page->default_tab)
	    {
	      sprintf (string, "Page %d", i);
	      page->tab_label = gtk_label_new (string);
	      gtk_widget_set_parent (page->tab_label, GTK_WIDGET (notebook));
	    }
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	  gtk_widget_show (page->tab_label);
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	  i++;
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	}
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    }
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  gtk_widget_queue_resize (GTK_WIDGET (notebook));
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}

void
gtk_notebook_set_show_border (GtkNotebook *notebook,
			      gint         show_border)
{
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));

  if (notebook->show_border != show_border)
    {
      notebook->show_border = show_border;

      if (GTK_WIDGET_VISIBLE (notebook))
	gtk_widget_queue_resize (GTK_WIDGET (notebook));
    }
}

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void
gtk_notebook_set_scrollable (GtkNotebook     *notebook,
			     gint             scrollable)
{
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));

  if (scrollable != notebook->scrollable)
    {
      if ( (notebook->scrollable = (scrollable != 0)) ) 
	gtk_notebook_panel_realize (notebook);
      else if (notebook->panel)
	{
	  gdk_window_destroy (notebook->panel);
	  notebook->panel = NULL;
	}
      gtk_widget_queue_resize (GTK_WIDGET(notebook));
    }	  
}

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static void
gtk_notebook_map (GtkWidget *widget)
{
  GtkNotebook *notebook;
  GtkNotebookPage *page;
  GList *children;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (widget));

  GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
  gdk_window_show (widget->window);

  notebook = GTK_NOTEBOOK (widget);

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  if (notebook->cur_page && 
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      GTK_WIDGET_VISIBLE (notebook->cur_page->child) &&
      !GTK_WIDGET_MAPPED (notebook->cur_page->child))
    gtk_widget_map (notebook->cur_page->child);

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  if (notebook->scrollable)
      gtk_notebook_pages_allocate (notebook, &(widget->allocation));
  else
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    {
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      children = notebook->children;

      while (children)
	{
	  page = children->data;
	  children = children->next;
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	  if (page->tab_label && 
	      GTK_WIDGET_VISIBLE (page->child) && 
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	      !GTK_WIDGET_MAPPED (page->tab_label))
	    gtk_widget_map (page->tab_label);
	}
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    }
}

static void
gtk_notebook_unmap (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (widget));

  GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
  gdk_window_hide (widget->window);
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  if (GTK_NOTEBOOK (widget)->panel)
    gdk_window_hide (GTK_NOTEBOOK (widget)->panel);
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}

static void
gtk_notebook_realize (GtkWidget *widget)
{
  GtkNotebook *notebook;
  GdkWindowAttr attributes;
  gint attributes_mask;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (widget));

  notebook = GTK_NOTEBOOK (widget);
  GTK_WIDGET_SET_FLAGS (notebook, GTK_REALIZED);

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = gtk_widget_get_events (widget);
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  attributes.event_mask |= GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK
    | GDK_BUTTON_RELEASE_MASK | GDK_KEY_PRESS_MASK;
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  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

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  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
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  gdk_window_set_user_data (widget->window, notebook);

  widget->style = gtk_style_attach (widget->style, widget->window);
  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
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  if (notebook->scrollable)
    gtk_notebook_panel_realize (notebook);
}

static void
gtk_notebook_panel_realize (GtkNotebook *notebook)
{
  GtkWidget *widget;
  GdkWindowAttr attributes;
  gint attributes_mask;
  
  g_return_if_fail (notebook != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (notebook));
  
  widget = GTK_WIDGET (notebook);
  
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK 
    | GDK_BUTTON_RELEASE_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_ENTER_NOTIFY_MASK
    | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK;
  
  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
  
  attributes.width = 2 * ARROW_SIZE + ARROW_SPACING;
  attributes.height = ARROW_SIZE;

  attributes.x = widget->allocation.width - attributes.width - 
    GTK_CONTAINER (notebook)->border_width;
  attributes.y = widget->allocation.height - ARROW_SIZE -
    GTK_CONTAINER (notebook)->border_width;
  if (notebook->tab_pos == GTK_POS_TOP)
    attributes.y = GTK_CONTAINER (notebook)->border_width;
  else if (notebook->tab_pos == GTK_POS_LEFT)
    attributes.x = widget->allocation.x 
      + GTK_CONTAINER (notebook)->border_width;

  
  notebook->panel = gdk_window_new (widget->window, &attributes, 
				    attributes_mask);
  gtk_style_set_background (widget->style, notebook->panel, 
			    GTK_STATE_NORMAL);
  gdk_window_set_user_data (notebook->panel, widget);
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}

static void
gtk_notebook_size_request (GtkWidget      *widget,
			   GtkRequisition *requisition)
{
  GtkNotebook *notebook;
  GtkNotebookPage *page;
  GList *children;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (widget));
  g_return_if_fail (requisition != NULL);

  notebook = GTK_NOTEBOOK (widget);
  widget->requisition.width = 0;
  widget->requisition.height = 0;

  children = notebook->children;
  while (children)
    {
      page = children->data;
      children = children->next;

      if (GTK_WIDGET_VISIBLE (page->child))
	{
	  gtk_widget_size_request (page->child, &page->child->requisition);
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	  widget->requisition.width = MAX (widget->requisition.width,
					   page->child->requisition.width);
	  widget->requisition.height = MAX (widget->requisition.height,
					    page->child->requisition.height);
	}
    }

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  if (notebook->show_border || notebook->show_tabs)
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    {
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      widget->requisition.width += widget->style->klass->xthickness * 2;
      widget->requisition.height += widget->style->klass->ythickness * 2;
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      if (notebook->show_tabs)
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	{
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	  gint tab_width = 0;
	  gint tab_height = 0;
	  gint tab_max = 0;
	  
	  children = notebook->children;
	  while (children)
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	    {
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	      page = children->data;
	      children = children->next;
	      
	      if (GTK_WIDGET_VISIBLE (page->child))
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		{
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		  gtk_widget_size_request (page->tab_label, 
					   &page->tab_label->requisition);
		  
		  page->requisition.width = 
		    (page->tab_label->requisition.width +
		     (widget->style->klass->xthickness + notebook->tab_border)
		     * 2);
		  page->requisition.height = 
		    (page->tab_label->requisition.height +
		     (widget->style->klass->ythickness + notebook->tab_border)
		     * 2);
		  
		  switch (notebook->tab_pos)
		    {
		    case GTK_POS_TOP:
		    case GTK_POS_BOTTOM:
		      page->requisition.width -= TAB_OVERLAP;

		      tab_width += page->requisition.width;
		      tab_height = MAX (tab_height, page->requisition.height);
		      tab_max = MAX (tab_max, page->requisition.width);
		      break;
		    case GTK_POS_LEFT:
		    case GTK_POS_RIGHT:
		      page->requisition.height -= TAB_OVERLAP;

		      tab_width = MAX (tab_width, page->requisition.width);
		      tab_height += page->requisition.height;
		      tab_max = MAX (tab_max, page->requisition.height);
		      break;
		    }
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		}
	    }

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	  children = notebook->children;
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	  if (children && children->next && notebook->scrollable) 
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	    {
	      if ((notebook->tab_pos == GTK_POS_TOP) ||
		  (notebook->tab_pos == GTK_POS_BOTTOM))
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		{
		  if (widget->requisition.width < tab_width)
		    {
		      tab_width = tab_max + 2 * (ARROW_SIZE + ARROW_SPACING);
		      tab_height = MAX (tab_height, ARROW_SIZE);
		    }
		}
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	      else
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		{
		  if (widget->requisition.height < tab_height)
		    {
		      tab_height = tab_max + ARROW_SIZE + ARROW_SPACING;
		      tab_width = MAX (tab_width, 
				       ARROW_SPACING + 2 * ARROW_SIZE);
		    }
		}
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	    }

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	  while (children)
	    {
	      page = children->data;
	      children = children->next;
	      
	      if (GTK_WIDGET_VISIBLE (page->child))
		{
		  if ((notebook->tab_pos == GTK_POS_TOP) ||
		      (notebook->tab_pos == GTK_POS_BOTTOM))
		    page->requisition.height = tab_height;
		  else
		    page->requisition.width = tab_width;
		}
	    }
	  
	  switch (notebook->tab_pos)
	    {
	    case GTK_POS_TOP:
	    case GTK_POS_BOTTOM:
	      tab_width += widget->style->klass->xthickness;
	      widget->requisition.width = MAX (widget->requisition.width, 
					       tab_width);
	      widget->requisition.height += tab_height;
	      break;
	    case GTK_POS_LEFT:
	    case GTK_POS_RIGHT:
	      tab_height += widget->style->klass->ythickness;
	      widget->requisition.width += tab_width;
	      widget->requisition.height = MAX (widget->requisition.height, 
						tab_height);
	      break;
	    }
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	}
    }
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  widget->requisition.width += GTK_CONTAINER (widget)->border_width * 2;
  widget->requisition.height += GTK_CONTAINER (widget)->border_width * 2;
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}

static void
gtk_notebook_size_allocate (GtkWidget     *widget,
			    GtkAllocation *allocation)
{
  GtkNotebook *notebook;
  GtkNotebookPage *page;
  GtkAllocation child_allocation;
  GList *children;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (widget));
  g_return_if_fail (allocation != NULL);

  widget->allocation = *allocation;
  if (GTK_WIDGET_REALIZED (widget))
    gdk_window_move_resize (widget->window,
			    allocation->x, allocation->y,
			    allocation->width, allocation->height);

  notebook = GTK_NOTEBOOK (widget);
  if (notebook->children)
    {
      child_allocation.x = GTK_CONTAINER (widget)->border_width;
      child_allocation.y = GTK_CONTAINER (widget)->border_width;
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      child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2);
      child_allocation.height = MAX (1, allocation->height - child_allocation.y * 2);
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      if (notebook->show_tabs || notebook->show_border)
	{
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	  child_allocation.x += widget->style->klass->xthickness;
	  child_allocation.y += widget->style->klass->ythickness;
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	  child_allocation.width = MAX (1, 
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	      child_allocation.width - widget->style->klass->xthickness * 2);
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	  child_allocation.height = MAX (1, 
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              child_allocation.height - widget->style->klass->ythickness * 2);
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	  if (notebook->show_tabs && notebook->children)
	    {
	      switch (notebook->tab_pos)
		{
		case GTK_POS_TOP:
		  child_allocation.y += notebook->cur_page->requisition.height;
		case GTK_POS_BOTTOM:
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		  child_allocation.height = MAX (1, 
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		    child_allocation.height - notebook->cur_page->requisition.height);
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		  break;
		case GTK_POS_LEFT:
		  child_allocation.x += notebook->cur_page->requisition.width;
		case GTK_POS_RIGHT:
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		  child_allocation.width = MAX (1, 
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		    child_allocation.width - notebook->cur_page->requisition.width);
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		  break;
		}
	    }
	}

      children = notebook->children;
      while (children)
	{
	  page = children->data;
	  children = children->next;
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	  if (GTK_WIDGET_VISIBLE (page->child))
	    gtk_widget_size_allocate (page->child, &child_allocation);
	}

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      gtk_notebook_pages_allocate (notebook, allocation);
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    }
}

static void
gtk_notebook_paint (GtkWidget    *widget,
		    GdkRectangle *area)
{
  GtkNotebook *notebook;
  GtkNotebookPage *page;
  GList *children;
  GdkPoint points[6];
  gint width, height;
  gint x, y;
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  gint showarrow;
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  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (widget));
  g_return_if_fail (area != NULL);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      notebook = GTK_NOTEBOOK (widget);

      gdk_window_clear_area (widget->window,
			     area->x, area->y,
			     area->width, area->height);

      if (notebook->show_tabs || notebook->show_border)
	{
	  x = GTK_CONTAINER (widget)->border_width;
	  y = GTK_CONTAINER (widget)->border_width;
	  width = widget->allocation.width - x * 2;
	  height = widget->allocation.height - y * 2;

	  if (notebook->show_tabs && notebook->children)
	    {
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	      if (!GTK_WIDGET_MAPPED (notebook->cur_page->tab_label))
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		{
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		  GtkNotebookPage *page;

		  page = notebook->first_tab->data;

		  switch (notebook->tab_pos)
		    {
		    case GTK_POS_TOP:
		      y += page->allocation.height +
			widget->style->klass->ythickness;
		    case GTK_POS_BOTTOM:
		      height -= page->allocation.height +
			widget->style->klass->ythickness;
		      break;
		    case GTK_POS_LEFT:
		      x += page->allocation.width +
			widget->style->klass->xthickness;
		    case GTK_POS_RIGHT:
		      width -= page->allocation.width +
			widget->style->klass->xthickness;
		    break;
		    }
		  gtk_draw_shadow (widget->style, widget->window,
				   GTK_STATE_NORMAL, GTK_SHADOW_OUT,
				   x, y, width, height);
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		}
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	      else
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		{
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		  switch (notebook->tab_pos)
		    {
		    case GTK_POS_TOP:
		      y += notebook->cur_page->allocation.height;
		    case GTK_POS_BOTTOM:
		      height -= notebook->cur_page->allocation.height;
		      break;
		    case GTK_POS_LEFT:
		      x += notebook->cur_page->allocation.width;
		    case GTK_POS_RIGHT:
		      width -= notebook->cur_page->allocation.width;
		      break;
		    }

		  switch (notebook->tab_pos)
		    {
		    case GTK_POS_TOP:
		      points[0].x = notebook->cur_page->allocation.x;
		      points[0].y = y;
		      points[1].x = x;
		      points[1].y = y;
		      points[2].x = x;
		      points[2].y = y + height - 1;
		      points[3].x = x + width - 1;
		      points[3].y = y + height - 1;
		      points[4].x = x + width - 1;
		      points[4].y = y;
		      points[5].x = (notebook->cur_page->allocation.x +
				     notebook->cur_page->allocation.width -
				     widget->style->klass->xthickness);
		      points[5].y = y;

		      if (points[5].x == (x + width))
			points[5].x -= 1;
		      break;
		    case GTK_POS_BOTTOM:
		      points[0].x = (notebook->cur_page->allocation.x +
				     notebook->cur_page->allocation.width -
				     widget->style->klass->xthickness);
		      points[0].y = y + height - 1;
		      points[1].x = x + width - 1;
		      points[1].y = y + height - 1;
		      points[2].x = x + width - 1;
		      points[2].y = y;
		      points[3].x = x;
		      points[3].y = y;
		      points[4].x = x;
		      points[4].y = y + height - 1;
		      points[5].x = notebook->cur_page->allocation.x;
		      points[5].y = y + height - 1;

		      if (points[0].x == (x + width))
			points[0].x -= 1;
		      break;
		    case GTK_POS_LEFT:
		      points[0].x = x;
		      points[0].y = (notebook->cur_page->allocation.y +
				     notebook->cur_page->allocation.height -
				     widget->style->klass->ythickness);
		      points[1].x = x;
		      points[1].y = y + height - 1;
		      points[2].x = x + width - 1;
		      points[2].y = y + height - 1;
		      points[3].x = x + width - 1;
		      points[3].y = y;
		      points[4].x = x;
		      points[4].y = y;
		      points[5].x = x;
		      points[5].y = notebook->cur_page->allocation.y;
		      
		      if (points[0].y == (y + height))
			points[0].y -= 1;
		      break;
		    case GTK_POS_RIGHT:
		      points[0].x = x + width - 1;
		      points[0].y = notebook->cur_page->allocation.y;
		      points[1].x = x + width - 1;
		      points[1].y = y;
		      points[2].x = x;
		      points[2].y = y;
		      points[3].x = x;
		      points[3].y = y + height - 1;
		      points[4].x = x + width - 1;
		      points[4].y = y + height - 1;
		      points[5].x = x + width - 1;
		      points[5].y = (notebook->cur_page->allocation.y +
				     notebook->cur_page->allocation.height -
				     widget->style->klass->ythickness);

		      if (points[5].y == (y + height))
			points[5].y -= 1;
		      break;
		    }
		  
		  gtk_draw_polygon (widget->style, widget->window,
				    GTK_STATE_NORMAL, GTK_SHADOW_OUT,
				    points, 6, FALSE);
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		}
	      children = g_list_last (notebook->children);
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	      showarrow = FALSE;

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	      while (children)
		{
		  page = children->data;
		  children = children->prev;

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		  if (!GTK_WIDGET_MAPPED (page->tab_label))
		    showarrow = TRUE;
		  else if (notebook->cur_page != page)
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		    gtk_notebook_draw_tab (notebook, page, area);
		}

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	      if (showarrow && notebook->scrollable && notebook->show_tabs) 
		{
		  gtk_notebook_draw_arrow (notebook, GTK_ARROW_LEFT);
		  gtk_notebook_draw_arrow (notebook, GTK_ARROW_RIGHT);
		}
	      if (notebook->cur_page && 
		  GTK_WIDGET_MAPPED(((GtkNotebookPage *)
				     (notebook->cur_page))->tab_label))
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		gtk_notebook_draw_tab (notebook, notebook->cur_page, area);
	    }
	  else if (notebook->show_border)
	    {
	      gtk_draw_shadow (widget->style, widget->window,
			       GTK_STATE_NORMAL, GTK_SHADOW_OUT,
			       x, y, width, height);
	    }
	}
    }
}

static void
gtk_notebook_draw (GtkWidget    *widget,
		   GdkRectangle *area)
{
  GtkNotebook *notebook;
  GdkRectangle child_area;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_NOTEBOOK (widget));
  g_return_if_fail (area != NULL);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      notebook = GTK_NOTEBOOK (widget);

      gtk_notebook_paint (widget, area);
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      gtk_widget_draw_focus (widget);
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      if (notebook->cur_page &&
	  gtk_widget_intersect (notebook->cur_page->child, area, &child_area))
	gtk_widget_draw (notebook->cur_page->child, &child_area);
    }
}

static gint
gtk_notebook_expose (GtkWidget      *widget,
		     GdkEventExpose *event)
{
  GtkNotebook *notebook;
  GdkEventExpose child_event;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_NOTEBOOK (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      notebook = GTK_NOTEBOOK (widget);

      gtk_notebook_paint (widget, &event->area);
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      gtk_widget_draw_focus (widget);
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      child_event = *event;
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      if (notebook->cur_page && 
	  GTK_WIDGET_NO_WINDOW (notebook->cur_page->child) &&
	  gtk_widget_intersect (notebook->cur_page->child