gtkmenuitem.c

gtk是linux一款强大的夸平台的图形化开发工具

/* 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
 * 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 1997-1999.  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 <string.h>
#include "gtkaccellabel.h"
#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmenubar.h"
#include "gtkmenuitem.h"
#include "gtksignal.h"


#define BORDER_SPACING  3
#define SELECT_TIMEOUT  75

#define MENU_ITEM_CLASS(w)  GTK_MENU_ITEM_CLASS (GTK_OBJECT (w)->klass)


enum {
  ACTIVATE,
  ACTIVATE_ITEM,
  LAST_SIGNAL
};


static void gtk_menu_item_class_init     (GtkMenuItemClass *klass);
static void gtk_menu_item_init           (GtkMenuItem      *menu_item);
static void gtk_menu_item_destroy        (GtkObject        *object);
static void gtk_menu_item_size_request   (GtkWidget        *widget,
					  GtkRequisition   *requisition);
static void gtk_menu_item_size_allocate  (GtkWidget        *widget,
					  GtkAllocation    *allocation);
static void gtk_menu_item_paint          (GtkWidget        *widget,
					  GdkRectangle     *area);
static void gtk_menu_item_draw           (GtkWidget        *widget,
					  GdkRectangle     *area);
static gint gtk_menu_item_expose         (GtkWidget        *widget,
					  GdkEventExpose   *event);
static void gtk_real_menu_item_select    (GtkItem          *item);
static void gtk_real_menu_item_deselect  (GtkItem          *item);
static void gtk_real_menu_item_activate_item  (GtkMenuItem      *item);
static gint gtk_menu_item_select_timeout (gpointer          data);
static void gtk_menu_item_select_timeout_unlocked (gpointer     data);
static void gtk_menu_item_position_menu  (GtkMenu          *menu,
					  gint             *x,
					  gint             *y,
					  gpointer          user_data);
static void gtk_menu_item_show_all       (GtkWidget        *widget);
static void gtk_menu_item_hide_all       (GtkWidget        *widget);
static void gtk_menu_item_forall         (GtkContainer    *container,
					  gboolean         include_internals,
					  GtkCallback      callback,
					  gpointer         callback_data);

static GtkItemClass *parent_class;
static guint menu_item_signals[LAST_SIGNAL] = { 0 };
static guint32	last_submenu_deselect_time = 0;



GtkType
gtk_menu_item_get_type (void)
{
  static GtkType menu_item_type = 0;

  if (!menu_item_type)
    {
      static const GtkTypeInfo menu_item_info =
      {
	"GtkMenuItem",
	sizeof (GtkMenuItem),
	sizeof (GtkMenuItemClass),
	(GtkClassInitFunc) gtk_menu_item_class_init,
	(GtkObjectInitFunc) gtk_menu_item_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      menu_item_type = gtk_type_unique (gtk_item_get_type (), &menu_item_info);
      gtk_type_set_chunk_alloc (menu_item_type, 16);
    }

  return menu_item_type;
}

static void
gtk_menu_item_class_init (GtkMenuItemClass *klass)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;
  GtkItemClass *item_class;

  object_class = (GtkObjectClass*) klass;
  widget_class = (GtkWidgetClass*) klass;
  container_class = (GtkContainerClass*) klass;
  item_class = (GtkItemClass*) klass;

  parent_class = gtk_type_class (gtk_item_get_type ());

  menu_item_signals[ACTIVATE] =
    gtk_signal_new ("activate",
                    GTK_RUN_FIRST | GTK_RUN_ACTION,
                    object_class->type,
                    GTK_SIGNAL_OFFSET (GtkMenuItemClass, activate),
                    gtk_marshal_NONE__NONE,
		    GTK_TYPE_NONE, 0);

  menu_item_signals[ACTIVATE_ITEM] =
    gtk_signal_new ("activate_item",
                    GTK_RUN_FIRST,
                    object_class->type,
                    GTK_SIGNAL_OFFSET (GtkMenuItemClass, activate_item),
                    gtk_signal_default_marshaller,
		    GTK_TYPE_NONE, 0);

  gtk_object_class_add_signals (object_class, menu_item_signals, LAST_SIGNAL);

  object_class->destroy = gtk_menu_item_destroy;

  widget_class->activate_signal = menu_item_signals[ACTIVATE];
  widget_class->size_request = gtk_menu_item_size_request;
  widget_class->size_allocate = gtk_menu_item_size_allocate;
  widget_class->draw = gtk_menu_item_draw;
  widget_class->expose_event = gtk_menu_item_expose;
  widget_class->show_all = gtk_menu_item_show_all;
  widget_class->hide_all = gtk_menu_item_hide_all;

  container_class->forall = gtk_menu_item_forall;

  item_class->select = gtk_real_menu_item_select;
  item_class->deselect = gtk_real_menu_item_deselect;

  klass->activate = NULL;
  klass->activate_item = gtk_real_menu_item_activate_item;

  klass->toggle_size = 0;
  klass->hide_on_activate = TRUE;
}

static void
gtk_menu_item_init (GtkMenuItem *menu_item)
{
  menu_item->submenu = NULL;
  menu_item->accelerator_signal = menu_item_signals[ACTIVATE];
  menu_item->toggle_size = 0;
  menu_item->accelerator_width = 0;
  menu_item->show_toggle_indicator = FALSE;
  menu_item->show_submenu_indicator = FALSE;
  menu_item->submenu_direction = GTK_DIRECTION_RIGHT;
  menu_item->submenu_placement = GTK_TOP_BOTTOM;
  menu_item->right_justify = FALSE;

  menu_item->timer = 0;
}

GtkWidget*
gtk_menu_item_new (void)
{
  return GTK_WIDGET (gtk_type_new (gtk_menu_item_get_type ()));
}

GtkWidget*
gtk_menu_item_new_with_label (const gchar *label)
{
  GtkWidget *menu_item;
  GtkWidget *accel_label;

  menu_item = gtk_menu_item_new ();
  accel_label = gtk_accel_label_new (label);
  gtk_misc_set_alignment (GTK_MISC (accel_label), 0.0, 0.5);

  gtk_container_add (GTK_CONTAINER (menu_item), accel_label);
  gtk_accel_label_set_accel_widget (GTK_ACCEL_LABEL (accel_label), menu_item);
  gtk_widget_show (accel_label);

  return menu_item;
}

static void
gtk_menu_item_destroy (GtkObject *object)
{
  GtkMenuItem *menu_item;

  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (object));

  menu_item = GTK_MENU_ITEM (object);

  if (menu_item->submenu)
    gtk_widget_destroy (menu_item->submenu);

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

static void
gtk_menu_item_detacher (GtkWidget     *widget,
			GtkMenu       *menu)
{
  GtkMenuItem *menu_item;

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

  menu_item = GTK_MENU_ITEM (widget);
  g_return_if_fail (menu_item->submenu == (GtkWidget*) menu);

  menu_item->submenu = NULL;
}

void
gtk_menu_item_set_submenu (GtkMenuItem *menu_item,
			   GtkWidget   *submenu)
{
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));
  
  if (menu_item->submenu != submenu)
    {
      gtk_menu_item_remove_submenu (menu_item);
      
      menu_item->submenu = submenu;
      gtk_menu_attach_to_widget (GTK_MENU (submenu),
				 GTK_WIDGET (menu_item),
				 gtk_menu_item_detacher);
      
      if (GTK_WIDGET (menu_item)->parent)
	gtk_widget_queue_resize (GTK_WIDGET (menu_item));
    }
}

void
gtk_menu_item_remove_submenu (GtkMenuItem         *menu_item)
{
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));
      
  if (menu_item->submenu)
    gtk_menu_detach (GTK_MENU (menu_item->submenu));
}

void
gtk_menu_item_set_placement (GtkMenuItem         *menu_item,
			     GtkSubmenuPlacement  placement)
{
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));

  menu_item->submenu_placement = placement;
}

void
gtk_menu_item_configure (GtkMenuItem *menu_item,
			 gint         show_toggle_indicator,
			 gint         show_submenu_indicator)
{
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));

  menu_item->show_toggle_indicator = (show_toggle_indicator == TRUE);
  menu_item->show_submenu_indicator = (show_submenu_indicator == TRUE);
}

void
gtk_menu_item_select (GtkMenuItem *menu_item)
{
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));
  
  gtk_item_select (GTK_ITEM (menu_item));
}

void
gtk_menu_item_deselect (GtkMenuItem *menu_item)
{
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));
  
  gtk_item_deselect (GTK_ITEM (menu_item));
}

void
gtk_menu_item_activate (GtkMenuItem *menu_item)
{
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));
  
  gtk_signal_emit (GTK_OBJECT (menu_item), menu_item_signals[ACTIVATE]);
}

static void
gtk_menu_item_accel_width_foreach (GtkWidget *widget,
				   gpointer data)
{
  guint *width = data;

  if (GTK_IS_ACCEL_LABEL (widget))
    {
      guint w;

      w = gtk_accel_label_get_accel_width (GTK_ACCEL_LABEL (widget));
      *width = MAX (*width, w);
    }
  else if (GTK_IS_CONTAINER (widget))
    gtk_container_foreach (GTK_CONTAINER (widget),
			   gtk_menu_item_accel_width_foreach,
			   data);
}

static void
gtk_menu_item_size_request (GtkWidget      *widget,
			    GtkRequisition *requisition)
{
  GtkMenuItem *menu_item;
  GtkBin *bin;
  guint accel_width;

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

  bin = GTK_BIN (widget);
  menu_item = GTK_MENU_ITEM (widget);

  requisition->width = (GTK_CONTAINER (widget)->border_width +
			widget->style->klass->xthickness +
			BORDER_SPACING) * 2;
  requisition->height = (GTK_CONTAINER (widget)->border_width +
			 widget->style->klass->ythickness) * 2;

  if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
    {
      GtkRequisition child_requisition;
      
      gtk_widget_size_request (bin->child, &child_requisition);

      requisition->width += child_requisition.width;
      requisition->height += child_requisition.height;
    }

  if (menu_item->submenu && menu_item->show_submenu_indicator)
    requisition->width += 21;

  accel_width = 0;
  gtk_container_foreach (GTK_CONTAINER (menu_item),
			 gtk_menu_item_accel_width_foreach,
			 &accel_width);
  menu_item->accelerator_width = accel_width;
}

static void
gtk_menu_item_size_allocate (GtkWidget     *widget,
			     GtkAllocation *allocation)
{
  GtkMenuItem *menu_item;
  GtkBin *bin;
  GtkAllocation child_allocation;

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

  menu_item = GTK_MENU_ITEM (widget);
  bin = GTK_BIN (widget);
  
  widget->allocation = *allocation;

  if (bin->child)
    {
      child_allocation.x = (GTK_CONTAINER (widget)->border_width +
                            widget->style->klass->xthickness +
			    BORDER_SPACING);
      child_allocation.y = (GTK_CONTAINER (widget)->border_width +
			    widget->style->klass->ythickness);
      child_allocation.width = MAX (1, (gint)allocation->width - child_allocation.x * 2);
      child_allocation.height = MAX (1, (gint)allocation->height - child_allocation.y * 2);
      child_allocation.x += GTK_MENU_ITEM (widget)->toggle_size;
      child_allocation.width -= GTK_MENU_ITEM (widget)->toggle_size;
      if (menu_item->submenu && menu_item->show_submenu_indicator)
	child_allocation.width -= 21;
      
      gtk_widget_size_allocate (bin->child, &child_allocation);
    }

  if (GTK_WIDGET_REALIZED (widget))
    gdk_window_move_resize (widget->window,