gtkoptionmenu.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 "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtkoptionmenu.h"
#include "gtksignal.h"
#include "gdk/gdkkeysyms.h"


#define CHILD_LEFT_SPACING        5
#define CHILD_RIGHT_SPACING       1
#define CHILD_TOP_SPACING         1
#define CHILD_BOTTOM_SPACING      1
#define OPTION_INDICATOR_WIDTH    12
#define OPTION_INDICATOR_HEIGHT   8
#define OPTION_INDICATOR_SPACING  2


static void gtk_option_menu_class_init      (GtkOptionMenuClass *klass);
static void gtk_option_menu_init            (GtkOptionMenu      *option_menu);
static void gtk_option_menu_destroy         (GtkObject          *object);
static void gtk_option_menu_size_request    (GtkWidget          *widget,
					     GtkRequisition     *requisition);
static void gtk_option_menu_size_allocate   (GtkWidget          *widget,
					     GtkAllocation      *allocation);
static void gtk_option_menu_paint           (GtkWidget          *widget,
					     GdkRectangle       *area);
static void gtk_option_menu_draw            (GtkWidget          *widget,
					     GdkRectangle       *area);
static gint gtk_option_menu_expose          (GtkWidget          *widget,
					     GdkEventExpose     *event);
static gint gtk_option_menu_button_press    (GtkWidget          *widget,
					     GdkEventButton     *event);
static gint gtk_option_menu_key_press	    (GtkWidget          *widget,
					     GdkEventKey        *event);
static void gtk_option_menu_deactivate      (GtkMenuShell       *menu_shell,
					     GtkOptionMenu      *option_menu);
static void gtk_option_menu_update_contents (GtkOptionMenu      *option_menu);
static void gtk_option_menu_remove_contents (GtkOptionMenu      *option_menu);
static void gtk_option_menu_calc_size       (GtkOptionMenu      *option_menu);
static void gtk_option_menu_position        (GtkMenu            *menu,
					     gint               *x,
					     gint               *y,
					     gpointer            user_data);
static void gtk_option_menu_show_all        (GtkWidget          *widget);
static void gtk_option_menu_hide_all        (GtkWidget          *widget);
static GtkType gtk_option_menu_child_type   (GtkContainer       *container);

				       

static GtkButtonClass *parent_class = NULL;


GtkType
gtk_option_menu_get_type (void)
{
  static GtkType option_menu_type = 0;

  if (!option_menu_type)
    {
      static const GtkTypeInfo option_menu_info =
      {
	"GtkOptionMenu",
	sizeof (GtkOptionMenu),
	sizeof (GtkOptionMenuClass),
	(GtkClassInitFunc) gtk_option_menu_class_init,
	(GtkObjectInitFunc) gtk_option_menu_init,
	/* reserved_1 */ NULL,
        /* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };

      option_menu_type = gtk_type_unique (gtk_button_get_type (), &option_menu_info);
    }

  return option_menu_type;
}

static void
gtk_option_menu_class_init (GtkOptionMenuClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkButtonClass *button_class;
  GtkContainerClass *container_class;

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

  parent_class = gtk_type_class (gtk_button_get_type ());

  object_class->destroy = gtk_option_menu_destroy;

  widget_class->draw = gtk_option_menu_draw;
  widget_class->size_request = gtk_option_menu_size_request;
  widget_class->size_allocate = gtk_option_menu_size_allocate;
  widget_class->expose_event = gtk_option_menu_expose;
  widget_class->button_press_event = gtk_option_menu_button_press;
  widget_class->key_press_event = gtk_option_menu_key_press;
  widget_class->show_all = gtk_option_menu_show_all;
  widget_class->hide_all = gtk_option_menu_hide_all;

  container_class->child_type = gtk_option_menu_child_type;
}

static GtkType
gtk_option_menu_child_type (GtkContainer       *container)
{
  return GTK_TYPE_NONE;
}

static void
gtk_option_menu_init (GtkOptionMenu *option_menu)
{
  GTK_WIDGET_SET_FLAGS (option_menu, GTK_CAN_FOCUS);
  GTK_WIDGET_UNSET_FLAGS (option_menu, GTK_CAN_DEFAULT | GTK_RECEIVES_DEFAULT);

  option_menu->menu = NULL;
  option_menu->menu_item = NULL;
  option_menu->width = 0;
  option_menu->height = 0;
}

GtkWidget*
gtk_option_menu_new (void)
{
  return GTK_WIDGET (gtk_type_new (gtk_option_menu_get_type ()));
}

GtkWidget*
gtk_option_menu_get_menu (GtkOptionMenu *option_menu)
{
  g_return_val_if_fail (option_menu != NULL, NULL);
  g_return_val_if_fail (GTK_IS_OPTION_MENU (option_menu), NULL);

  return option_menu->menu;
}

static void
gtk_option_menu_detacher (GtkWidget     *widget,
			  GtkMenu	*menu)
{
  GtkOptionMenu *option_menu;

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

  option_menu = GTK_OPTION_MENU (widget);
  g_return_if_fail (option_menu->menu == (GtkWidget*) menu);

  gtk_option_menu_remove_contents (option_menu);
  gtk_signal_disconnect_by_data (GTK_OBJECT (option_menu->menu),
				 option_menu);
  
  option_menu->menu = NULL;
}

void
gtk_option_menu_set_menu (GtkOptionMenu *option_menu,
			  GtkWidget     *menu)
{
  g_return_if_fail (option_menu != NULL);
  g_return_if_fail (GTK_IS_OPTION_MENU (option_menu));
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));

  if (option_menu->menu != menu)
    {
      gtk_option_menu_remove_menu (option_menu);

      option_menu->menu = menu;
      gtk_menu_attach_to_widget (GTK_MENU (menu),
				 GTK_WIDGET (option_menu),
				 gtk_option_menu_detacher);

      gtk_option_menu_calc_size (option_menu);

      gtk_signal_connect (GTK_OBJECT (option_menu->menu), "deactivate",
			  (GtkSignalFunc) gtk_option_menu_deactivate,
			  option_menu);

      if (GTK_WIDGET (option_menu)->parent)
	gtk_widget_queue_resize (GTK_WIDGET (option_menu));

      gtk_option_menu_update_contents (option_menu);
    }
}

void
gtk_option_menu_remove_menu (GtkOptionMenu *option_menu)
{
  g_return_if_fail (option_menu != NULL);
  g_return_if_fail (GTK_IS_OPTION_MENU (option_menu));

  if (option_menu->menu)
    gtk_menu_detach (GTK_MENU (option_menu->menu));
}

void
gtk_option_menu_set_history (GtkOptionMenu *option_menu,
			     guint          index)
{
  GtkWidget *menu_item;

  g_return_if_fail (option_menu != NULL);
  g_return_if_fail (GTK_IS_OPTION_MENU (option_menu));

  if (option_menu->menu)
    {
      gtk_menu_set_active (GTK_MENU (option_menu->menu), index);
      menu_item = gtk_menu_get_active (GTK_MENU (option_menu->menu));

      if (menu_item != option_menu->menu_item)
	{
	  gtk_option_menu_remove_contents (option_menu);
	  gtk_option_menu_update_contents (option_menu);
	}
    }
}


static void
gtk_option_menu_destroy (GtkObject *object)
{
  GtkOptionMenu *option_menu;

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

  option_menu = GTK_OPTION_MENU (object);

  if (option_menu->menu)
    gtk_widget_destroy (option_menu->menu);

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

static void
gtk_option_menu_size_request (GtkWidget      *widget,
			      GtkRequisition *requisition)
{
  GtkOptionMenu *option_menu;
  gint tmp;

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

  option_menu = GTK_OPTION_MENU (widget);

  requisition->width = ((GTK_CONTAINER (widget)->border_width +
			 GTK_WIDGET (widget)->style->klass->xthickness) * 2 +
			option_menu->width +
			OPTION_INDICATOR_WIDTH +
			OPTION_INDICATOR_SPACING * 5 +
			CHILD_LEFT_SPACING + CHILD_RIGHT_SPACING + 2);
  requisition->height = ((GTK_CONTAINER (widget)->border_width +
			  GTK_WIDGET (widget)->style->klass->ythickness) * 2 +
			 option_menu->height +
			 CHILD_TOP_SPACING + CHILD_BOTTOM_SPACING + 2);

  tmp = (requisition->height - option_menu->height +
	 OPTION_INDICATOR_HEIGHT + OPTION_INDICATOR_SPACING * 2);
  requisition->height = MAX (requisition->height, tmp);
}

static void
gtk_option_menu_size_allocate (GtkWidget     *widget,
			       GtkAllocation *allocation)
{
  GtkWidget *child;
  GtkAllocation child_allocation;

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

  child = GTK_BIN (widget)->child;
  if (child && GTK_WIDGET_VISIBLE (child))
    {
      child_allocation.x = (GTK_CONTAINER (widget)->border_width +
			    GTK_WIDGET (widget)->style->klass->xthickness) + 1;
      child_allocation.y = (GTK_CONTAINER (widget)->border_width +
			    GTK_WIDGET (widget)->style->klass->ythickness) + 1;
      child_allocation.width = MAX (1, (gint)allocation->width - child_allocation.x * 2 -
				    OPTION_INDICATOR_WIDTH - OPTION_INDICATOR_SPACING * 5 -
				    CHILD_LEFT_SPACING - CHILD_RIGHT_SPACING - 2);
      child_allocation.height = MAX (1, (gint)allocation->height - child_allocation.y * 2 -
				     CHILD_TOP_SPACING - CHILD_BOTTOM_SPACING - 2);
      child_allocation.x += CHILD_LEFT_SPACING;
      child_allocation.y += CHILD_RIGHT_SPACING;

      gtk_widget_size_allocate (child, &child_allocation);
    }
}

static void
gtk_option_menu_paint (GtkWidget    *widget,
		       GdkRectangle *area)
{
  GdkRectangle button_area;

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

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      button_area.x = GTK_CONTAINER (widget)->border_width + 1;
      button_area.y = GTK_CONTAINER (widget)->border_width + 1;
      button_area.width = widget->allocation.width - button_area.x * 2;
      button_area.height = widget->allocation.height - button_area.y * 2;

      /* This is evil, and should be elimated here and in the button
       * code. The point is to clear the focus, and make it
       * sort of transparent if it isn't there.
       */
      gdk_window_set_back_pixmap (widget->window, NULL, TRUE);
      gdk_window_clear_area (widget->window, area->x, area->y, area->width, area->height);

      gtk_paint_box(widget->style, widget->window,
		    GTK_WIDGET_STATE (widget), GTK_SHADOW_OUT,
		    area, widget, "optionmenu",
		    button_area.x, button_area.y,
		    button_area.width, button_area.height);
      
      gtk_paint_tab (widget->style, widget->window,
		     GTK_WIDGET_STATE (widget), GTK_SHADOW_OUT,
		     area, widget, "optionmenutab",
		     button_area.x + button_area.width - button_area.x -