gtknotebook.c

/* 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, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * 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/. 
 */

#include "gtknotebook.h"
#include "gtksignal.h"
#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtklabel.h"
#include <gdk/gdkkeysyms.h>
#include <stdio.h>
#include "gtkintl.h"
#include "gtkmarshalers.h"
#include "gtkbindings.h"


#define TAB_OVERLAP    2
#define TAB_CURVATURE  1
#define ARROW_SIZE     12
#define ARROW_SPACING  0
#define NOTEBOOK_INIT_SCROLL_DELAY (200)
#define NOTEBOOK_SCROLL_DELAY      (100)


enum {
  SWITCH_PAGE,
  FOCUS_TAB,
  SELECT_PAGE,
  CHANGE_CURRENT_PAGE,
  MOVE_FOCUS_OUT,
  LAST_SIGNAL
};

enum {
  STEP_PREV,
  STEP_NEXT
};

enum {
  PROP_0,
  PROP_TAB_POS,
  PROP_SHOW_TABS,
  PROP_SHOW_BORDER,
  PROP_SCROLLABLE,
  PROP_TAB_BORDER,
  PROP_TAB_HBORDER,
  PROP_TAB_VBORDER,
  PROP_PAGE,
  PROP_ENABLE_POPUP,
  PROP_HOMOGENEOUS
};

enum {
  CHILD_PROP_0,
  CHILD_PROP_TAB_LABEL,
  CHILD_PROP_MENU_LABEL,
  CHILD_PROP_POSITION,
  CHILD_PROP_TAB_EXPAND,
  CHILD_PROP_TAB_FILL,
  CHILD_PROP_TAB_PACK
};

#define GTK_NOTEBOOK_PAGE(_glist_)         ((GtkNotebookPage *)((GList *)(_glist_))->data)

struct _GtkNotebookPage
{
  GtkWidget *child;
  GtkWidget *tab_label;
  GtkWidget *menu_label;
  GtkWidget *last_focus_child;	/* Last descendant of the page that had focus */

  guint default_menu : 1;	/* If true, we create the menu label ourself */
  guint default_tab  : 1;	/* If true, we create the tab label ourself */
  guint expand       : 1;
  guint fill         : 1;
  guint pack         : 1;

  GtkRequisition requisition;
  GtkAllocation allocation;

  guint mnemonic_activate_signal;
};

#ifdef G_DISABLE_CHECKS
#define CHECK_FIND_CHILD(notebook, child)                           \
 gtk_notebook_find_child (notebook, child, G_STRLOC)
#else
#define CHECK_FIND_CHILD(notebook, child)                           \
 gtk_notebook_find_child (notebook, child, NULL)
#endif
 
/*** GtkNotebook Methods ***/
static void gtk_notebook_class_init          (GtkNotebookClass *klass);
static void gtk_notebook_init                (GtkNotebook      *notebook);

static gboolean gtk_notebook_select_page         (GtkNotebook      *notebook,
						  gboolean          move_focus);
static gboolean gtk_notebook_focus_tab           (GtkNotebook      *notebook,
						  GtkNotebookTab    type);
static void     gtk_notebook_change_current_page (GtkNotebook      *notebook,
						  gint              offset);
static void     gtk_notebook_move_focus_out      (GtkNotebook      *notebook,
						  GtkDirectionType  direction_type);

/*** GtkObject Methods ***/
static void gtk_notebook_destroy             (GtkObject        *object);
static void gtk_notebook_set_property	     (GObject         *object,
					      guint            prop_id,
					      const GValue    *value,
					      GParamSpec      *pspec);
static void gtk_notebook_get_property	     (GObject         *object,
					      guint            prop_id,
					      GValue          *value,
					      GParamSpec      *pspec);

/*** GtkWidget Methods ***/
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_unrealize           (GtkWidget        *widget);
static void gtk_notebook_size_request        (GtkWidget        *widget,
					      GtkRequisition   *requisition);
static void gtk_notebook_size_allocate       (GtkWidget        *widget,
					      GtkAllocation    *allocation);
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_focus_in            (GtkWidget        *widget,
					      GdkEventFocus    *event);
static void gtk_notebook_draw_focus          (GtkWidget        *widget);
static gint gtk_notebook_focus               (GtkWidget        *widget,
					      GtkDirectionType  direction);

/*** GtkContainer Methods ***/
static void gtk_notebook_set_child_property  (GtkContainer     *container,
					      GtkWidget        *child,
					      guint             property_id,
					      const GValue     *value,
					      GParamSpec       *pspec);
static void gtk_notebook_get_child_property  (GtkContainer     *container,
					      GtkWidget        *child,
					      guint             property_id,
					      GValue           *value,
					      GParamSpec       *pspec);
static void gtk_notebook_add                 (GtkContainer     *container,
					      GtkWidget        *widget);
static void gtk_notebook_remove              (GtkContainer     *container,
					      GtkWidget        *widget);
static void gtk_notebook_set_focus_child     (GtkContainer     *container,
					      GtkWidget        *child);
static GtkType gtk_notebook_child_type       (GtkContainer     *container);
static void gtk_notebook_forall              (GtkContainer     *container,
					      gboolean		include_internals,
					      GtkCallback       callback,
					      gpointer          callback_data);

/*** GtkNotebook Private Functions ***/
static void gtk_notebook_redraw_tabs         (GtkNotebook      *notebook);
static void gtk_notebook_redraw_arrows       (GtkNotebook      *notebook);
static void gtk_notebook_focus_changed       (GtkNotebook      *notebook,
					      GtkNotebookPage  *old_page);
static void gtk_notebook_real_remove         (GtkNotebook      *notebook,
					      GList            *list);
static void gtk_notebook_update_labels       (GtkNotebook      *notebook);
static gint gtk_notebook_timer               (GtkNotebook      *notebook);
static gint gtk_notebook_page_compare        (gconstpointer     a,
					      gconstpointer     b);
static GList* gtk_notebook_find_child        (GtkNotebook      *notebook,
					      GtkWidget        *child,
					      const gchar      *function);
static gint  gtk_notebook_real_page_position (GtkNotebook      *notebook,
					      GList            *list);
static GList * gtk_notebook_search_page      (GtkNotebook      *notebook,
					      GList            *list,
					      gint              direction,
					      gboolean          find_visible);

/*** GtkNotebook Drawing Functions ***/
static void gtk_notebook_paint               (GtkWidget        *widget,
					      GdkRectangle     *area);
static void gtk_notebook_draw_tab            (GtkNotebook      *notebook,
					      GtkNotebookPage  *page,
					      GdkRectangle     *area);
static void gtk_notebook_draw_arrow          (GtkNotebook      *notebook,
					      guint             arrow);

/*** GtkNotebook Size Allocate Functions ***/
static void gtk_notebook_pages_allocate      (GtkNotebook      *notebook);
static void gtk_notebook_page_allocate       (GtkNotebook      *notebook,
					      GtkNotebookPage  *page,
					      GtkAllocation    *allocation);
static void gtk_notebook_calc_tabs           (GtkNotebook      *notebook,
			                      GList            *start,
					      GList           **end,
					      gint             *tab_space,
					      guint             direction);

/*** GtkNotebook Page Switch Methods ***/
static void gtk_notebook_real_switch_page    (GtkNotebook      *notebook,
					      GtkNotebookPage  *page,
					      guint             page_num);

/*** GtkNotebook Page Switch Functions ***/
static void gtk_notebook_switch_page         (GtkNotebook      *notebook,
					      GtkNotebookPage  *page,
					      gint              page_num);
static gint gtk_notebook_page_select         (GtkNotebook      *notebook,
					      gboolean          move_focus);
static void gtk_notebook_switch_focus_tab    (GtkNotebook      *notebook,
                                              GList            *new_child);
static void gtk_notebook_menu_switch_page    (GtkWidget        *widget,
					      GtkNotebookPage  *page);

/*** GtkNotebook Menu Functions ***/
static void gtk_notebook_menu_item_create    (GtkNotebook      *notebook,
					      GList            *list);
static void gtk_notebook_menu_label_unparent (GtkWidget        *widget,
					      gpointer          data);
static void gtk_notebook_menu_detacher       (GtkWidget        *widget,
					      GtkMenu          *menu);

static gboolean focus_tabs_in  (GtkNotebook      *notebook);
static gboolean focus_child_in (GtkNotebook      *notebook,
				GtkDirectionType  direction);

static GtkContainerClass *parent_class = NULL;
static guint notebook_signals[LAST_SIGNAL] = { 0 };

GtkType
gtk_notebook_get_type (void)
{
  static GtkType notebook_type = 0;

  if (!notebook_type)
    {
      static const GtkTypeInfo notebook_info =
      {
	"GtkNotebook",
	sizeof (GtkNotebook),
	sizeof (GtkNotebookClass),
	(GtkClassInitFunc) gtk_notebook_class_init,
	(GtkObjectInitFunc) gtk_notebook_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

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

  return notebook_type;
}

static void
add_tab_bindings (GtkBindingSet    *binding_set,
		  GdkModifierType   modifiers,
		  GtkDirectionType  direction)
{
  gtk_binding_entry_add_signal (binding_set, GDK_Tab, modifiers,
                                "move_focus_out", 1,
                                GTK_TYPE_DIRECTION_TYPE, direction);
  gtk_binding_entry_add_signal (binding_set, GDK_KP_Tab, modifiers,
                                "move_focus_out", 1,
                                GTK_TYPE_DIRECTION_TYPE, direction);
}

static void
add_arrow_bindings (GtkBindingSet    *binding_set,
		    guint             keysym,
		    GtkDirectionType  direction)
{
  guint keypad_keysym = keysym - GDK_Left + GDK_KP_Left;
  
  gtk_binding_entry_add_signal (binding_set, keysym, GDK_CONTROL_MASK,
                                "move_focus_out", 1,
                                GTK_TYPE_DIRECTION_TYPE, direction);
  gtk_binding_entry_add_signal (binding_set, keypad_keysym, GDK_CONTROL_MASK,
                                "move_focus_out", 1,
                                GTK_TYPE_DIRECTION_TYPE, direction);
}

static void
gtk_notebook_class_init (GtkNotebookClass *class)
{
  GObjectClass   *gobject_class = G_OBJECT_CLASS (class);
  GtkObjectClass *object_class = GTK_OBJECT_CLASS (class);
  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (class);
  GtkBindingSet *binding_set;
  
  parent_class = g_type_class_peek_parent (class);

  gobject_class->set_property = gtk_notebook_set_property;
  gobject_class->get_property = gtk_notebook_get_property;
  object_class->destroy = gtk_notebook_destroy;

  widget_class->map = gtk_notebook_map;
  widget_class->unmap = gtk_notebook_unmap;
  widget_class->realize = gtk_notebook_realize;
  widget_class->unrealize = gtk_notebook_unrealize;
  widget_class->size_request = gtk_notebook_size_request;
  widget_class->size_allocate = gtk_notebook_size_allocate;
  widget_class->expose_event = gtk_notebook_expose;
  widget_class->button_press_event = gtk_notebook_button_press;
  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->focus_in_event = gtk_notebook_focus_in;
  widget_class->focus = gtk_notebook_focus;
  
  container_class->add = gtk_notebook_add;
  container_class->remove = gtk_notebook_remove;
  container_class->forall = gtk_notebook_forall;
  container_class->set_focus_child = gtk_notebook_set_focus_child;
  container_class->get_child_property = gtk_notebook_get_child_property;
  container_class->set_child_property = gtk_notebook_set_child_property;
  container_class->child_type = gtk_notebook_child_type;

  class->switch_page = gtk_notebook_real_switch_page;

  class->focus_tab = gtk_notebook_focus_tab;
  class->select_page = gtk_notebook_select_page;
  class->change_current_page = gtk_notebook_change_current_page;
  class->move_focus_out = gtk_notebook_move_focus_out;
  
  g_object_class_install_property (gobject_class,
				   PROP_PAGE,
				   g_param_spec_int ("page",
 						     _("Page"),
 						     _("The index of the current page"),
 						     0,
 						     G_MAXINT,
 						     0,
 						     G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
				   PROP_TAB_POS,
				   g_param_spec_enum ("tab_pos",
 						      _("Tab Position"),
 						      _("Which side of the notebook holds the tabs"),
 						      GTK_TYPE_POSITION_TYPE,
 						      GTK_POS_TOP,
 						      G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
				   PROP_TAB_BORDER,
				   g_param_spec_uint ("tab_border",
 						      _("Tab Border"),
 						      _("Width of the border around the tab labels"),
 						      0,
 						      G_MAXUINT,
 						      2,
 						      G_PARAM_WRITABLE));
  g_object_class_install_property (gobject_class,
				   PROP_TAB_HBORDER,
				   g_param_spec_uint ("tab_hborder",
 						      _("Horizontal Tab Border"),
 						      _("Width of the horizontal border of tab labels"),
 						      0,
 						      G_MAXUINT,
 						      2,
 						      G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
				   PROP_TAB_VBORDER,
				   g_param_spec_uint ("tab_vborder",
 						      _("Vertical Tab Border"),
 						      _("Width of the vertical border of tab labels"),
 						      0,
 						      G_MAXUINT,
 						      2,
 						      G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
				   PROP_SHOW_TABS,
				   g_param_spec_boolean ("show_tabs",
 							 _("Show Tabs"),
 							 _("Whether tabs should be shown or not"),
 							 TRUE,
 							 G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
				   PROP_SHOW_BORDER,
				   g_param_spec_boolean ("show_border",
 							 _("Show Border"),
 							 _("Whether the border should be shown or not"),
 							 TRUE,
 							 G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
				   PROP_SCROLLABLE,
				   g_param_spec_boolean ("scrollable",
 							 _("Scrollable"),
 							 _("If TRUE, scroll arrows are added if there are too many tabs to fit"),
 							 FALSE,
 							 G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
				   PROP_ENABLE_POPUP,
				   g_param_spec_boolean ("enable_popup",
 							 _("Enable Popup"),
 							 _("If TRUE, pressing the right mouse button on the notebook pops up a menu that you can use to go to a page"),
 							 FALSE,
 							 G_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
				   PROP_HOMOGENEOUS,
				   g_param_spec_boolean ("homogeneous",
 							 _("Homogeneous"),
 							 _("Whether tabs should have homogeneous sizes"),
 							 FALSE,
							 G_PARAM_READWRITE));

  gtk_container_class_install_child_property (container_class,
					      CHILD_PROP_TAB_LABEL,
					      g_param_spec_string ("tab_label", 
								   _("Tab label"),
								   _("The string displayed on the childs tab label"),
								   NULL,
								   G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
					      CHILD_PROP_MENU_LABEL,
					      g_param_spec_string ("menu_label", 
								   _("Menu label"), 
								   _("The string displayed in the childs menu entry"),
								   NULL,
								   G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
					      CHILD_PROP_POSITION,
					      g_param_spec_int ("position", 
								_("Position"), 
								_("The index of the child in the parent"),
								-1, G_MAXINT, 0,
								G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
					      CHILD_PROP_TAB_EXPAND,
					      g_param_spec_boolean ("tab_expand", 
								    _("Tab expand"), 
								    _("Whether to expand the childs tab or not"),
								    TRUE,
								    G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
					      CHILD_PROP_TAB_FILL,
					      g_param_spec_boolean ("tab_fill", 
								    _("Tab fill"), 
								    _("Wheather the childs tab should fill the allocated area or not"),
								    TRUE,
								    G_PARAM_READWRITE));
  gtk_container_class_install_child_property (container_class,
					      CHILD_PROP_TAB_PACK,
					      g_param_spec_enum ("tab_pack", 
								 _("Tab pack type"),
								 _("A GtkPackType indicating whether the child is packed with reference to the start or end of the parent"),
								 GTK_TYPE_PACK_TYPE, GTK_PACK_START,
								 G_PARAM_READWRITE));
  
  notebook_signals[SWITCH_PAGE] =
    gtk_signal_new ("switch_page",
		    GTK_RUN_LAST,
		    GTK_CLASS_TYPE (object_class),
		    GTK_SIGNAL_OFFSET (GtkNotebookClass, switch_page),
		    _gtk_marshal_VOID__POINTER_UINT,
		    GTK_TYPE_NONE, 2,
		    GTK_TYPE_POINTER,
		    GTK_TYPE_UINT);
  notebook_signals[FOCUS_TAB] = 
    g_signal_new ("focus_tab",
                  G_TYPE_FROM_CLASS (object_class),
                  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (GtkNotebookClass, focus_tab),
                  NULL, NULL,
                  _gtk_marshal_BOOLEAN__ENUM,
                  G_TYPE_BOOLEAN, 1,
                  GTK_TYPE_NOTEBOOK_TAB);
  notebook_signals[SELECT_PAGE] = 
    g_signal_new ("select_page",
                  G_TYPE_FROM_CLASS (object_class),
                  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (GtkNotebookClass, select_page),
                  NULL, NULL,
                  _gtk_marshal_BOOLEAN__BOOLEAN,
                  G_TYPE_BOOLEAN, 1,
                  G_TYPE_BOOLEAN);
  notebook_signals[CHANGE_CURRENT_PAGE] = 
    g_signal_new ("change_current_page",
                  G_TYPE_FROM_CLASS (object_class),
                  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (GtkNotebookClass, change_current_page),
                  NULL, NULL,
                  _gtk_marshal_VOID__INT,
                  G_TYPE_NONE, 1,
                  G_TYPE_INT);
  notebook_signals[MOVE_FOCUS_OUT] =
    g_signal_new ("move_focus_out",
                  G_TYPE_FROM_CLASS (object_class),
                  G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (GtkNotebookClass, move_focus_out),
                  NULL, NULL,
                  _gtk_marshal_VOID__ENUM,
                  G_TYPE_NONE, 1,
                  GTK_TYPE_DIRECTION_TYPE);
  
  
  binding_set = gtk_binding_set_by_class (object_class);
  gtk_binding_entry_add_signal (binding_set,
                                GDK_space, 0,
                                "select_page", 1, 
                                G_TYPE_BOOLEAN, FALSE);
  gtk_binding_entry_add_signal (binding_set,
                                GDK_KP_Space, 0,
                                "select_page", 1, 
                                G_TYPE_BOOLEAN, FALSE);
  
  gtk_binding_entry_add_signal (binding_set,
                                GDK_Home, 0,
                                "focus_tab", 1, 
                                GTK_TYPE_NOTEBOOK_TAB, GTK_NOTEBOOK_TAB_FIRST);
  gtk_binding_entry_add_signal (binding_set,
                                GDK_KP_Home, 0,
                                "focus_tab", 1, 
                                GTK_TYPE_NOTEBOOK_TAB, GTK_NOTEBOOK_TAB_FIRST);
  gtk_binding_entry_add_signal (binding_set,
                                GDK_End, 0,
                                "focus_tab", 1, 
                                GTK_TYPE_NOTEBOOK_TAB, GTK_NOTEBOOK_TAB_LAST);
  gtk_binding_entry_add_signal (binding_set,
                                GDK_KP_End, 0,
                                "focus_tab", 1, 
                                GTK_TYPE_NOTEBOOK_TAB, GTK_NOTEBOOK_TAB_LAST);

  gtk_binding_entry_add_signal (binding_set,
                                GDK_Page_Up, GDK_CONTROL_MASK,
                                "change_current_page", 1,
                                G_TYPE_INT, -1);
  gtk_binding_entry_add_signal (binding_set,
                                GDK_Page_Down, GDK_CONTROL_MASK,
                                "change_current_page", 1,
                                G_TYPE_INT, 1);

  add_arrow_bindings (binding_set, GDK_Up, GTK_DIR_UP);
  add_arrow_bindings (binding_set, GDK_Down, GTK_DIR_DOWN);
  add_arrow_bindings (binding_set, GDK_Left, GTK_DIR_LEFT);
  add_arrow_bindings (binding_set, GDK_Right, GTK_DIR_RIGHT);

  add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD);
  add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD);
}

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

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

  notebook->tab_hborder = 2;
  notebook->tab_vborder = 2;

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

static gboolean
gtk_notebook_select_page (GtkNotebook *notebook,
                          gboolean     move_focus)
{
  if (gtk_widget_is_focus (GTK_WIDGET (notebook)))
    {
      gtk_notebook_page_select (notebook, move_focus);
      return TRUE;
    }
  else
    return FALSE;
}

static gboolean
gtk_notebook_focus_tab (GtkNotebook       *notebook,
                        GtkNotebookTab     type)
{
  GList *list;

  if (gtk_widget_is_focus (GTK_WIDGET (notebook)))
    {
      switch (type)
	{
	case GTK_NOTEBOOK_TAB_FIRST:
	  list = gtk_notebook_search_page (notebook, NULL, STEP_NEXT, TRUE);
	  if (list)
	    gtk_notebook_switch_focus_tab (notebook, list);
	  break;
	case GTK_NOTEBOOK_TAB_LAST:
	  list = gtk_notebook_search_page (notebook, NULL, STEP_PREV, TRUE);
	  if (list)
	    gtk_notebook_switch_focus_tab (notebook, list);
	  break;
	}

      return TRUE;
    }
  else
    return FALSE;
}

static void
gtk_notebook_change_current_page (GtkNotebook *notebook,
				  gint         offset)
{
  GList *current = NULL;
  
  if (notebook->cur_page)
    current = g_list_find (notebook->children, notebook->cur_page);

  while (offset != 0)
    {
      current = gtk_notebook_search_page (notebook, current, offset < 0 ? STEP_PREV : STEP_NEXT, TRUE);
      offset += offset < 0 ? 1 : -1;
    }

  if (current)
    gtk_notebook_switch_page (notebook, current->data, -1);
  else
    gdk_display_beep (gtk_widget_get_display (GTK_WIDGET (notebook)));
}

static GtkDirectionType
get_effective_direction (GtkNotebook      *notebook,
			 GtkDirectionType  direction)
{
  /* Remap the directions into the effective direction it would be for a
   * GTK_POS_TOP notebook
   */
#define D(rest) GTK_DIR_##rest

  static const GtkDirectionType translate_direction[4][6] = {
    /* LEFT */   { D(TAB_FORWARD),  D(TAB_BACKWARD), D(LEFT), D(RIGHT), D(UP),   D(DOWN) },
    /* RIGHT */  { D(TAB_BACKWARD), D(TAB_FORWARD),  D(LEFT), D(RIGHT), D(DOWN), D(UP)   },
    /* TOP */    { D(TAB_FORWARD),  D(TAB_BACKWARD), D(UP),   D(DOWN),  D(LEFT), D(RIGHT) },
    /* BOTTOM */ { D(TAB_BACKWARD), D(TAB_FORWARD),  D(DOWN), D(UP),    D(LEFT), D(RIGHT) },
  };

#undef D

  return translate_direction[notebook->tab_pos][direction];
}

static void
gtk_notebook_move_focus_out (GtkNotebook      *notebook,
			     GtkDirectionType  direction_type)
{
  GtkDirectionType effective_direction = get_effective_direction (notebook, direction_type);
  GtkWidget *toplevel;
  
  if (GTK_CONTAINER (notebook)->focus_child && effective_direction == GTK_DIR_UP)
    if (focus_tabs_in (notebook))
      return;
  
  if (gtk_widget_is_focus (GTK_WIDGET (notebook)) && effective_direction == GTK_DIR_DOWN)
    if (focus_child_in (notebook, GTK_DIR_TAB_FORWARD))
      return;

  /* At this point, we know we should be focusing out of the notebook entirely. We
   * do this by setting a flag, then propagating the focus motion to the notebook.
   */
  toplevel = gtk_widget_get_toplevel (GTK_WIDGET (notebook));
  if (!GTK_WIDGET_TOPLEVEL (toplevel))
    return;

  g_object_ref (notebook);
  
  notebook->focus_out = TRUE;
  g_signal_emit_by_name (G_OBJECT (toplevel), "move_focus", direction_type);
  notebook->focus_out = FALSE;
  
  g_object_unref (notebook);

}

/**
 * gtk_notebook_new:
 * 
 * Creates a new #GtkNotebook widget with no pages.

 * Return value: the newly created #GtkNotebook
 **/
GtkWidget*
gtk_notebook_new (void)
{
  return GTK_WIDGET (gtk_type_new (gtk_notebook_get_type ()));
}

/* Private GtkObject Methods :
 * 
 * gtk_notebook_destroy
 * gtk_notebook_set_arg
 * gtk_notebook_get_arg
 */
static void
gtk_notebook_destroy (GtkObject *object)
{
  GtkNotebook *notebook = GTK_NOTEBOOK (object);
  
  if (notebook->menu)
    gtk_notebook_popup_disable (notebook);

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

static void
gtk_notebook_set_property (GObject         *object,
			   guint            prop_id,
			   const GValue    *value,
			   GParamSpec      *pspec)
{
  GtkNotebook *notebook;

  notebook = GTK_NOTEBOOK (object);

  switch (prop_id)
    {
    case PROP_SHOW_TABS:
      gtk_notebook_set_show_tabs (notebook, g_value_get_boolean (value));
      break;
    case PROP_SHOW_BORDER:
      gtk_notebook_set_show_border (notebook, g_value_get_boolean (value));
      break;
    case PROP_SCROLLABLE:
      gtk_notebook_set_scrollable (notebook, g_value_get_boolean (value));
      break;
    case PROP_ENABLE_POPUP:
      if (g_value_get_boolean (value))
	gtk_notebook_popup_enable (notebook);
      else
	gtk_notebook_popup_disable (notebook);
      break;
    case PROP_HOMOGENEOUS:
      gtk_notebook_set_homogeneous_tabs (notebook, g_value_get_boolean (value));
      break;  
    case PROP_PAGE:
      gtk_notebook_set_current_page (notebook, g_value_get_int (value));
      break;
    case PROP_TAB_POS:
      gtk_notebook_set_tab_pos (notebook, g_value_get_enum (value));
      break;
    case PROP_TAB_BORDER:
      gtk_notebook_set_tab_border (notebook, g_value_get_uint (value));
      break;
    case PROP_TAB_HBORDER:
      gtk_notebook_set_tab_hborder (notebook, g_value_get_uint (value));
      break;
    case PROP_TAB_VBORDER:
      gtk_notebook_set_tab_vborder (notebook, g_value_get_uint (value));
      break;
    default:
      break;
    }
}

static void
gtk_notebook_get_property (GObject         *object,
			   guint            prop_id,
			   GValue          *value,
			   GParamSpec      *pspec)
{
  GtkNotebook *notebook;

  notebook = GTK_NOTEBOOK (object);

  switch (prop_id)
    {
    case PROP_SHOW_TABS:
      g_value_set_boolean (value, notebook->show_tabs);
      break;
    case PROP_SHOW_BORDER:
      g_value_set_boolean (value, notebook->show_border);
      break;
    case PROP_SCROLLABLE:
      g_value_set_boolean (value, notebook->scrollable);
      break;
    case PROP_ENABLE_POPUP:
      g_value_set_boolean (value, notebook->menu != NULL);
      break;
    case PROP_HOMOGENEOUS:
      g_value_set_boolean (value, notebook->homogeneous);
      break;
    case PROP_PAGE:
      g_value_set_int (value, gtk_notebook_get_current_page (notebook));
      break;
    case PROP_TAB_POS:
      g_value_set_enum (value, notebook->tab_pos);
      break;
    case PROP_TAB_HBORDER:
      g_value_set_uint (value, notebook->tab_hborder);
      break;
    case PROP_TAB_VBORDER:
      g_value_set_uint (value, notebook->tab_vborder);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

/* Private GtkWidget Methods :
 * 
 * gtk_notebook_map
 * gtk_notebook_unmap
 * gtk_notebook_realize
 * gtk_notebook_size_request
 * gtk_notebook_size_allocate
 * gtk_notebook_expose
 * gtk_notebook_button_press
 * gtk_notebook_button_release
 * gtk_notebook_enter_notify
 * gtk_notebook_leave_notify
 * gtk_notebook_motion_notify
 * gtk_notebook_focus_in
 * gtk_notebook_focus_out
 * gtk_notebook_draw_focus
 * gtk_notebook_style_set
 */
static gboolean
gtk_notebook_get_event_window_position (GtkNotebook  *notebook,
					GdkRectangle *rectangle)
{
  GtkWidget *widget = GTK_WIDGET (notebook);
  gint border_width = GTK_CONTAINER (notebook)->border_width;
  GtkNotebookPage *visible_page = NULL;
  GList *tmp_list;

  for (tmp_list = notebook->children; tmp_list; tmp_list = tmp_list->next)
    {
      GtkNotebookPage *page = tmp_list->data;
      if (GTK_WIDGET_VISIBLE (page->child))
	{
	  visible_page = page;
	  break;
	}
    }

  if (notebook->show_tabs && visible_page)
    {
      if (rectangle)
	{
	  rectangle->x = widget->allocation.x + border_width;
	  rectangle->y = widget->allocation.y + border_width;
	  
	  switch (notebook->tab_pos)
	    {
	    case GTK_POS_TOP:
	    case GTK_POS_BOTTOM:
	      rectangle->width = widget->allocation.width - 2 * border_width;
	      rectangle->height = visible_page->requisition.height;
	      if (notebook->tab_pos == GTK_POS_BOTTOM)
		rectangle->y += widget->allocation.height - 2 * border_width - rectangle->height;
	      break;
	    case GTK_POS_LEFT:
	    case GTK_POS_RIGHT:
	      rectangle->width = visible_page->requisition.width;
	      rectangle->height = widget->allocation.height - 2 * border_width;
	      if (notebook->tab_pos == GTK_POS_RIGHT)
		rectangle->x += widget->allocation.width - 2 * border_width - rectangle->width;
	      break;
	    }
	}

      return TRUE;
    }
  else
    {
      if (rectangle)
	{
	  rectangle->x = rectangle->y = 0;
	  rectangle->width = rectangle->height = 10;
	}
    }

  return FALSE;
}

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

  g_return_if_fail (GTK_IS_NOTEBOOK (widget));

  GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);

  notebook = GTK_NOTEBOOK (widget);

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

  if (notebook->scrollable)
    gtk_notebook_pages_allocate (notebook);
  else
    {
      children = notebook->children;

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

	  if (page->tab_label &&
	      GTK_WIDGET_VISIBLE (page->tab_label) &&
	      !GTK_WIDGET_MAPPED (page->tab_label))
	    gtk_widget_map (page->tab_label);
	}
    }

  if (gtk_notebook_get_event_window_position (notebook, NULL))
    gdk_window_show_unraised (notebook->event_window);
}

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

  GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);

  gdk_window_hide (GTK_NOTEBOOK (widget)->event_window);

  GTK_WIDGET_CLASS (parent_class)->unmap (widget);
}

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

  g_return_if_fail (GTK_IS_NOTEBOOK (widget));

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

  gtk_notebook_get_event_window_position (notebook, &event_window_pos);
  
  widget->window = gtk_widget_get_parent_window (widget);
  gdk_window_ref (widget->window);
  
  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = event_window_pos.x;
  attributes.y = event_window_pos.y;
  attributes.width = event_window_pos.width;
  attributes.height = event_window_pos.height;
  attributes.wclass = GDK_INPUT_ONLY;
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= (GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK |
			    GDK_BUTTON_RELEASE_MASK | GDK_KEY_PRESS_MASK);

  attributes_mask = GDK_WA_X | GDK_WA_Y;