/* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include "gtkcheckmenuitem.h"
#include "gtklabel.h"
#include "gtksignal.h"


#define CHECK_MENU_ITEM_CLASS(w)  GTK_CHECK_MENU_ITEM_CLASS (GTK_OBJECT (w)->klass)


enum {
  TOGGLED,
  LAST_SIGNAL
};


static void gtk_check_menu_item_class_init          (GtkCheckMenuItemClass *klass);
static void gtk_check_menu_item_init                (GtkCheckMenuItem      *check_menu_item);
static void gtk_check_menu_item_draw                (GtkWidget             *widget,
						     GdkRectangle          *area);
static gint gtk_check_menu_item_expose              (GtkWidget             *widget,
						     GdkEventExpose        *event);
static void gtk_check_menu_item_activate            (GtkMenuItem           *menu_item);
static void gtk_check_menu_item_draw_indicator      (GtkCheckMenuItem      *check_menu_item,
						     GdkRectangle          *area);
static void gtk_real_check_menu_item_draw_indicator (GtkCheckMenuItem      *check_menu_item,
						     GdkRectangle          *area);


static GtkMenuItemClass *parent_class = NULL;
static guint check_menu_item_signals[LAST_SIGNAL] = { 0 };


guint
gtk_check_menu_item_get_type ()
{
  static guint check_menu_item_type = 0;

  if (!check_menu_item_type)
    {
      GtkTypeInfo check_menu_item_info =
      {
        "GtkCheckMenuItem",
        sizeof (GtkCheckMenuItem),
        sizeof (GtkCheckMenuItemClass),
        (GtkClassInitFunc) gtk_check_menu_item_class_init,
        (GtkObjectInitFunc) gtk_check_menu_item_init,
        (GtkArgSetFunc) NULL,
        (GtkArgGetFunc) NULL,
      };

      check_menu_item_type = gtk_type_unique (gtk_menu_item_get_type (), &check_menu_item_info);
    }

  return check_menu_item_type;
}

GtkWidget*
gtk_check_menu_item_new ()
{
  return GTK_WIDGET (gtk_type_new (gtk_check_menu_item_get_type ()));
}

GtkWidget*
gtk_check_menu_item_new_with_label (const gchar *label)
{
  GtkWidget *check_menu_item;
  GtkWidget *label_widget;

  check_menu_item = gtk_check_menu_item_new ();
  label_widget = gtk_label_new (label);
  gtk_misc_set_alignment (GTK_MISC (label_widget), 0.0, 0.5);

  gtk_container_add (GTK_CONTAINER (check_menu_item), label_widget);
  gtk_widget_show (label_widget);

  return check_menu_item;
}

void
gtk_check_menu_item_set_state (GtkCheckMenuItem *check_menu_item,
			       gint              state)
{
  g_return_if_fail (check_menu_item != NULL);
  g_return_if_fail (GTK_IS_CHECK_MENU_ITEM (check_menu_item));

  if (check_menu_item->active != state)
    gtk_menu_item_activate (GTK_MENU_ITEM (check_menu_item));
}

void
gtk_check_menu_item_set_show_toggle (GtkCheckMenuItem *menu_item,
				     gboolean          always)
{
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_CHECK_MENU_ITEM (menu_item));
  
  menu_item->always_show_toggle = always != FALSE;
}

void
gtk_check_menu_item_toggled (GtkCheckMenuItem *check_menu_item)
{
  gtk_signal_emit (GTK_OBJECT (check_menu_item), check_menu_item_signals[TOGGLED]);
}

static void
gtk_check_menu_item_class_init (GtkCheckMenuItemClass *klass)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkMenuItemClass *menu_item_class;

  object_class = (GtkObjectClass*) klass;
  widget_class = (GtkWidgetClass*) klass;
  menu_item_class = (GtkMenuItemClass*) klass;

  parent_class = gtk_type_class (gtk_menu_item_get_type ());

  check_menu_item_signals[TOGGLED] =
    gtk_signal_new ("toggled",
                    GTK_RUN_FIRST,
                    object_class->type,
                    GTK_SIGNAL_OFFSET (GtkCheckMenuItemClass, toggled),
                    gtk_signal_default_marshaller,
		    GTK_TYPE_NONE, 0);

  gtk_object_class_add_signals (object_class, check_menu_item_signals, LAST_SIGNAL);

  widget_class->draw = gtk_check_menu_item_draw;
  widget_class->expose_event = gtk_check_menu_item_expose;

  menu_item_class->activate = gtk_check_menu_item_activate;
  menu_item_class->toggle_size = 12;

  klass->toggled = NULL;
  klass->draw_indicator = gtk_real_check_menu_item_draw_indicator;
}

static void
gtk_check_menu_item_init (GtkCheckMenuItem *check_menu_item)
{
  check_menu_item->active = FALSE;
  check_menu_item->always_show_toggle = FALSE;
}

static void
gtk_check_menu_item_draw (GtkWidget    *widget,
			  GdkRectangle *area)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_CHECK_MENU_ITEM (widget));
  g_return_if_fail (area != NULL);

  if (GTK_WIDGET_CLASS (parent_class)->draw)
    (* GTK_WIDGET_CLASS (parent_class)->draw) (widget, area);

  gtk_check_menu_item_draw_indicator (GTK_CHECK_MENU_ITEM (widget), area);
}

static gint
gtk_check_menu_item_expose (GtkWidget      *widget,
			    GdkEventExpose *event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_CHECK_MENU_ITEM (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (GTK_WIDGET_CLASS (parent_class)->expose_event)
    (* GTK_WIDGET_CLASS (parent_class)->expose_event) (widget, event);

  gtk_check_menu_item_draw_indicator (GTK_CHECK_MENU_ITEM (widget), &event->area);

  return FALSE;
}

static void
gtk_check_menu_item_activate (GtkMenuItem *menu_item)
{
  GtkCheckMenuItem *check_menu_item;

  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_CHECK_MENU_ITEM (menu_item));

  check_menu_item = GTK_CHECK_MENU_ITEM (menu_item);
  check_menu_item->active = !check_menu_item->active;

  gtk_check_menu_item_toggled (check_menu_item);
  gtk_widget_queue_draw (GTK_WIDGET (check_menu_item));
}

static void
gtk_check_menu_item_draw_indicator (GtkCheckMenuItem *check_menu_item,
				    GdkRectangle     *area)
{
  g_return_if_fail (check_menu_item != NULL);
  g_return_if_fail (GTK_IS_CHECK_MENU_ITEM (check_menu_item));
  g_return_if_fail (CHECK_MENU_ITEM_CLASS (check_menu_item) != NULL);

  if (CHECK_MENU_ITEM_CLASS (check_menu_item)->draw_indicator)
    (* CHECK_MENU_ITEM_CLASS (check_menu_item)->draw_indicator) (check_menu_item, area);
}

static void
gtk_real_check_menu_item_draw_indicator (GtkCheckMenuItem *check_menu_item,
					 GdkRectangle     *area)
{
  GtkWidget *widget;
  GtkStateType state_type;
  GtkShadowType shadow_type;
  gint width, height;
  gint x, y;

  g_return_if_fail (check_menu_item != NULL);
  g_return_if_fail (GTK_IS_CHECK_MENU_ITEM (check_menu_item));

  if (GTK_WIDGET_DRAWABLE (check_menu_item))
    {
      widget = GTK_WIDGET (check_menu_item);

      width = 8;
      height = 8;
      x = (GTK_CONTAINER (check_menu_item)->border_width +
	   widget->style->klass->xthickness + 2);
      y = (widget->allocation.height - height) / 2;

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

      if (check_menu_item->active ||
	  check_menu_item->always_show_toggle ||
	  (GTK_WIDGET_STATE (check_menu_item) == GTK_STATE_PRELIGHT))
	{
	  state_type = GTK_WIDGET_STATE (widget);
	  
	  if (check_menu_item->always_show_toggle)
	    {
	      shadow_type = GTK_SHADOW_OUT;
	      if (check_menu_item->active)
		shadow_type = GTK_SHADOW_IN;
	    }
	  else
	    {
	      shadow_type = GTK_SHADOW_IN;
	      if (check_menu_item->active &&
		  (state_type == GTK_STATE_PRELIGHT))
		shadow_type = GTK_SHADOW_OUT;
	    }
	  
	  gdk_draw_rectangle (widget->window,
			      widget->style->bg_gc[state_type],
			      TRUE, x, y, width, height);
	  gtk_draw_shadow (widget->style, widget->window,
			   state_type, shadow_type,
			   x, y, width, height);
	}
    }
}