gtkmenu.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 <ctype.h>
#include "gdk/gdkkeysyms.h"
#include "gtkbindings.h"
#include "gtklabel.h"
#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtksignal.h"
#include "gtkwindow.h"


#define MENU_ITEM_CLASS(w)   GTK_MENU_ITEM_CLASS (GTK_OBJECT (w)->klass)
#define	MENU_NEEDS_RESIZE(m) GTK_MENU_SHELL (m)->menu_flag

typedef struct _GtkMenuAttachData	GtkMenuAttachData;

struct _GtkMenuAttachData
{
  GtkWidget *attach_widget;
  GtkMenuDetachFunc detacher;
};


static void gtk_menu_class_init	    (GtkMenuClass      *klass);
static void gtk_menu_init	    (GtkMenu	       *menu);
static void gtk_menu_destroy	    (GtkObject	       *object);
static void gtk_menu_realize	    (GtkWidget	       *widget);
static void gtk_menu_size_request   (GtkWidget	       *widget,
				     GtkRequisition    *requisition);
static void gtk_menu_size_allocate  (GtkWidget	       *widget,
				     GtkAllocation     *allocation);
static void gtk_menu_paint	    (GtkWidget	       *widget);
static void gtk_menu_draw	    (GtkWidget	       *widget,
				     GdkRectangle      *area);
static gint gtk_menu_expose	    (GtkWidget	       *widget,
				     GdkEventExpose    *event);
static gint gtk_menu_key_press	    (GtkWidget	       *widget,
				     GdkEventKey       *event);
static gint gtk_menu_motion_notify  (GtkWidget	       *widget,
				     GdkEventMotion    *event);
static void gtk_menu_deactivate	    (GtkMenuShell      *menu_shell);
static void gtk_menu_show_all       (GtkWidget         *widget);
static void gtk_menu_hide_all       (GtkWidget         *widget);
static void gtk_menu_position       (GtkMenu           *menu);
static void gtk_menu_reparent       (GtkMenu           *menu, 
				     GtkWidget         *new_parent, 
				     gboolean           unrealize);

static GtkMenuShellClass *parent_class = NULL;
static const gchar	 *attach_data_key = "gtk-menu-attach-data";
static GQuark             quark_uline_accel_group = 0;


GtkType
gtk_menu_get_type (void)
{
  static GtkType menu_type = 0;
  
  if (!menu_type)
    {
      static const GtkTypeInfo menu_info =
      {
	"GtkMenu",
	sizeof (GtkMenu),
	sizeof (GtkMenuClass),
	(GtkClassInitFunc) gtk_menu_class_init,
	(GtkObjectInitFunc) gtk_menu_init,
	/* reserved_1 */ NULL,
	/* reserved_2 */ NULL,
        (GtkClassInitFunc) NULL,
      };
      
      menu_type = gtk_type_unique (gtk_menu_shell_get_type (), &menu_info);
    }
  
  return menu_type;
}

static void
gtk_menu_class_init (GtkMenuClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;
  GtkMenuShellClass *menu_shell_class;

  GtkBindingSet *binding_set;
  
  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  container_class = (GtkContainerClass*) class;
  menu_shell_class = (GtkMenuShellClass*) class;
  parent_class = gtk_type_class (gtk_menu_shell_get_type ());
  
  object_class->destroy = gtk_menu_destroy;
  
  widget_class->realize = gtk_menu_realize;
  widget_class->draw = gtk_menu_draw;
  widget_class->size_request = gtk_menu_size_request;
  widget_class->size_allocate = gtk_menu_size_allocate;
  widget_class->expose_event = gtk_menu_expose;
  widget_class->key_press_event = gtk_menu_key_press;
  widget_class->motion_notify_event = gtk_menu_motion_notify;
  widget_class->show_all = gtk_menu_show_all;
  widget_class->hide_all = gtk_menu_hide_all;
  
  menu_shell_class->submenu_placement = GTK_LEFT_RIGHT;
  menu_shell_class->deactivate = gtk_menu_deactivate;

  binding_set = gtk_binding_set_by_class (class);
  gtk_binding_entry_add_signal (binding_set,
				GDK_Up, 0,
				"move_current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_PREV);
  gtk_binding_entry_add_signal (binding_set,
				GDK_Down, 0,
				"move_current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_NEXT);
  gtk_binding_entry_add_signal (binding_set,
				GDK_Left, 0,
				"move_current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_PARENT);
  gtk_binding_entry_add_signal (binding_set,
				GDK_Right, 0,
				"move_current", 1,
				GTK_TYPE_MENU_DIRECTION_TYPE,
				GTK_MENU_DIR_CHILD);
}

static gint
gtk_menu_window_event (GtkWidget *window,
		       GdkEvent  *event,
		       GtkWidget *menu)
{
  gboolean handled = FALSE;

  gtk_widget_ref (window);
  gtk_widget_ref (menu);

  switch (event->type)
    {
    case GDK_KEY_PRESS:
    case GDK_KEY_RELEASE:
      gtk_widget_event (menu, event);
      handled = TRUE;
      break;
    default:
      break;
    }

  gtk_widget_unref (window);
  gtk_widget_unref (menu);

  return handled;
}

static void
gtk_menu_init (GtkMenu *menu)
{
  menu->parent_menu_item = NULL;
  menu->old_active_menu_item = NULL;
  menu->accel_group = NULL;
  menu->position_func = NULL;
  menu->position_func_data = NULL;

  menu->toplevel = gtk_window_new (GTK_WINDOW_POPUP);
  gtk_signal_connect (GTK_OBJECT (menu->toplevel),
		      "event",
		      GTK_SIGNAL_FUNC (gtk_menu_window_event), 
		      GTK_OBJECT (menu));
  gtk_window_set_policy (GTK_WINDOW (menu->toplevel),
			 FALSE, FALSE, TRUE);

  gtk_container_add (GTK_CONTAINER (menu->toplevel), GTK_WIDGET (menu));

  /* Refloat the menu, so that reference counting for the menu isn't
   * affected by it being a child of the toplevel
   */
  GTK_WIDGET_SET_FLAGS (menu, GTK_FLOATING);

  menu->tearoff_window = NULL;
  menu->torn_off = FALSE;

  MENU_NEEDS_RESIZE (menu) = TRUE;
}

static void
gtk_menu_destroy (GtkObject	    *object)
{
  GtkMenu *menu;
  GtkMenuAttachData *data;
  
  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_MENU (object));

  menu = GTK_MENU (object);
  
  gtk_object_ref (object);
  
  data = gtk_object_get_data (object, attach_data_key);
  if (data)
    gtk_menu_detach (menu);
  
  gtk_menu_set_accel_group (menu, NULL);

  if (menu->old_active_menu_item)
    {
      gtk_widget_unref (menu->old_active_menu_item);
      menu->old_active_menu_item = NULL;
    }

  /* Add back the reference count for being a child */
  gtk_object_ref (object);
  
  gtk_widget_destroy (menu->toplevel);
  if (menu->tearoff_window)
    gtk_widget_destroy (menu->tearoff_window);

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


void
gtk_menu_attach_to_widget (GtkMenu	       *menu,
			   GtkWidget	       *attach_widget,
			   GtkMenuDetachFunc	detacher)
{
  GtkMenuAttachData *data;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  g_return_if_fail (attach_widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (attach_widget));
  g_return_if_fail (detacher != NULL);
  
  /* keep this function in sync with gtk_widget_set_parent()
   */
  
  data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
  if (data)
    {
      g_warning ("gtk_menu_attach_to_widget(): menu already attached to %s",
		 gtk_type_name (GTK_OBJECT_TYPE (data->attach_widget)));
      return;
    }
  
  gtk_object_ref (GTK_OBJECT (menu));
  gtk_object_sink (GTK_OBJECT (menu));
  
  data = g_new (GtkMenuAttachData, 1);
  data->attach_widget = attach_widget;
  data->detacher = detacher;
  gtk_object_set_data (GTK_OBJECT (menu), attach_data_key, data);
  
  if (GTK_WIDGET_STATE (menu) != GTK_STATE_NORMAL)
    gtk_widget_set_state (GTK_WIDGET (menu), GTK_STATE_NORMAL);
  
  /* we don't need to set the style here, since
   * we are a toplevel widget.
   */
}

GtkWidget*
gtk_menu_get_attach_widget (GtkMenu		*menu)
{
  GtkMenuAttachData *data;
  
  g_return_val_if_fail (menu != NULL, NULL);
  g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
  
  data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
  if (data)
    return data->attach_widget;
  return NULL;
}

void
gtk_menu_detach (GtkMenu	     *menu)
{
  GtkMenuAttachData *data;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  
  /* keep this function in sync with gtk_widget_unparent()
   */
  data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
  if (!data)
    {
      g_warning ("gtk_menu_detach(): menu is not attached");
      return;
    }
  gtk_object_remove_data (GTK_OBJECT (menu), attach_data_key);
  
  data->detacher (data->attach_widget, menu);
  
  if (GTK_WIDGET_REALIZED (menu))
    gtk_widget_unrealize (GTK_WIDGET (menu));
  
  g_free (data);
  
  gtk_widget_unref (GTK_WIDGET (menu));
}

GtkWidget*
gtk_menu_new (void)
{
  return GTK_WIDGET (gtk_type_new (gtk_menu_get_type ()));
}

void
gtk_menu_append (GtkMenu   *menu,
		 GtkWidget *child)
{
  gtk_menu_shell_append (GTK_MENU_SHELL (menu), child);
}

void
gtk_menu_prepend (GtkMenu   *menu,
		  GtkWidget *child)
{
  gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), child);
}

void
gtk_menu_insert (GtkMenu   *menu,
		 GtkWidget *child,
		 gint	    position)
{
  gtk_menu_shell_insert (GTK_MENU_SHELL (menu), child, position);
}

static void
gtk_menu_tearoff_bg_copy (GtkMenu *menu)
{
  GtkWidget *widget;

  widget = GTK_WIDGET (menu);

  if (menu->torn_off)
    {
      GdkPixmap *pixmap;
      GdkGC *gc;
      GdkGCValues gc_values;
      
      gc_values.subwindow_mode = GDK_INCLUDE_INFERIORS;
      gc = gdk_gc_new_with_values (widget->window,
				   &gc_values, GDK_GC_SUBWINDOW);
      
      pixmap = gdk_pixmap_new (widget->window,
			       widget->requisition.width,
			       widget->requisition.height,
			       -1);

      gdk_draw_pixmap (pixmap, gc,
		       widget->window,
		       0, 0, 0, 0, -1, -1);
      gdk_gc_unref (gc);
      
      gtk_widget_set_usize (menu->tearoff_window,
			    widget->requisition.width,
			    widget->requisition.height);
      
      gdk_window_set_back_pixmap (menu->tearoff_window->window, pixmap, FALSE);
      gdk_pixmap_unref (pixmap);
    }
}

void
gtk_menu_popup (GtkMenu		    *menu,
		GtkWidget	    *parent_menu_shell,
		GtkWidget	    *parent_menu_item,
		GtkMenuPositionFunc  func,
		gpointer	     data,
		guint		     button,
		guint32		     activate_time)
{
  GtkWidget *widget;
  GtkWidget *xgrab_shell;
  GtkWidget *parent;
  GdkEvent *current_event;
  GtkMenuShell *menu_shell;
  
  g_return_if_fail (menu != NULL);