gtkmenuitem.c

gtk是linux一款强大的夸平台的图形化开发工具

                            allocation->x, allocation->y,
                            allocation->width, allocation->height);

  if (menu_item->submenu)
    gtk_menu_reposition (GTK_MENU (menu_item->submenu));
}

static void
gtk_menu_item_paint (GtkWidget    *widget,
		     GdkRectangle *area)
{
  GtkMenuItem *menu_item;
  GtkStateType state_type;
  GtkShadowType shadow_type;
  gint width, height;
  gint x, y;

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

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      menu_item = GTK_MENU_ITEM (widget);

      state_type = widget->state;

      x = GTK_CONTAINER (menu_item)->border_width;
      y = GTK_CONTAINER (menu_item)->border_width;
      width = widget->allocation.width - x * 2;
      height = widget->allocation.height - y * 2;
      
      if ((state_type == GTK_STATE_PRELIGHT) &&
	  (GTK_BIN (menu_item)->child))
	gtk_paint_box (widget->style,
		       widget->window,
		       GTK_STATE_PRELIGHT,
		       GTK_SHADOW_OUT,
		       area, widget, "menuitem",
		       x, y, width, height);
      else
	{
	  gdk_window_set_back_pixmap (widget->window, NULL, TRUE);
	  gdk_window_clear_area (widget->window, area->x, area->y, area->width, area->height);
	}

      if (menu_item->submenu && menu_item->show_submenu_indicator)
	{
	  shadow_type = GTK_SHADOW_OUT;
	  if (state_type == GTK_STATE_PRELIGHT)
	    shadow_type = GTK_SHADOW_IN;

	  gtk_paint_arrow (widget->style, widget->window,
			   state_type, shadow_type, 
			   area, widget, "menuitem", 
			   GTK_ARROW_RIGHT, TRUE,
			   x + width - 15, y + height / 2 - 5, 10, 10);
	}
      else if (!GTK_BIN (menu_item)->child)
	{
	   gtk_paint_hline (widget->style, widget->window, GTK_STATE_NORMAL,
			    area, widget, "menuitem",
			    0, widget->allocation.width, 0);
	}
    }
}

static void
gtk_menu_item_draw (GtkWidget    *widget,
		    GdkRectangle *area)
{
  GtkBin *bin;
  GdkRectangle child_area;

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

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_menu_item_paint (widget, area);

      bin = GTK_BIN (widget);

      if (bin->child)
        {
          if (gtk_widget_intersect (bin->child, area, &child_area))
            gtk_widget_draw (bin->child, &child_area);
        }
    }
}

static gint
gtk_menu_item_expose (GtkWidget      *widget,
		      GdkEventExpose *event)
{
  GtkBin *bin;
  GdkEventExpose child_event;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU_ITEM (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_menu_item_paint (widget, &event->area);

      bin = GTK_BIN (widget);

      if (bin->child)
        {
          child_event = *event;

          if (GTK_WIDGET_NO_WINDOW (bin->child) &&
              gtk_widget_intersect (bin->child, &event->area, &child_event.area))
            gtk_widget_event (bin->child, (GdkEvent*) &child_event);
        }
    }

  return FALSE;
}

static void
gtk_real_menu_item_select (GtkItem *item)
{
  GtkMenuItem *menu_item;

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

  menu_item = GTK_MENU_ITEM (item);

  /*  if (menu_item->submenu && !GTK_WIDGET_VISIBLE (menu_item->submenu))*/
  if (menu_item->submenu)
    {
      guint32 etime;
      GdkEvent *event = gtk_get_current_event ();

      etime = event ? gdk_event_get_time (event) : GDK_CURRENT_TIME;
      if (etime >= last_submenu_deselect_time &&
	  last_submenu_deselect_time + SELECT_TIMEOUT > etime)
	menu_item->timer = gtk_timeout_add (SELECT_TIMEOUT - (etime - last_submenu_deselect_time),
					    gtk_menu_item_select_timeout,
					    menu_item);
      else
	gtk_menu_item_select_timeout_unlocked (menu_item);
      if(event) gdk_event_free(event);
    }
  
  gtk_widget_set_state (GTK_WIDGET (menu_item), GTK_STATE_PRELIGHT);
  gtk_widget_draw (GTK_WIDGET (menu_item), NULL);
}

static void
gtk_real_menu_item_deselect (GtkItem *item)
{
  GtkMenuItem *menu_item;

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

  menu_item = GTK_MENU_ITEM (item);

  if (menu_item->submenu)
    {
      guint32 etime;
      GdkEvent *event = gtk_get_current_event ();

      if (menu_item->timer)
	{
	  gtk_timeout_remove (menu_item->timer);
	  menu_item->timer = 0;
	}
      else
	gtk_menu_popdown (GTK_MENU (menu_item->submenu));

      etime = event ? gdk_event_get_time (event) : GDK_CURRENT_TIME;
      if (etime > last_submenu_deselect_time)
	last_submenu_deselect_time = etime;
      if(event) gdk_event_free(event);
    }

  gtk_widget_set_state (GTK_WIDGET (menu_item), GTK_STATE_NORMAL);
  gtk_widget_draw (GTK_WIDGET (menu_item), NULL);
}

static void
gtk_real_menu_item_activate_item (GtkMenuItem *menu_item)
{
  GtkWidget *widget;

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

  widget = GTK_WIDGET (menu_item);
  
  if (widget->parent &&
      GTK_IS_MENU_SHELL (widget->parent))
    {
      if (menu_item->submenu == NULL)
	gtk_menu_shell_activate_item (GTK_MENU_SHELL (widget->parent),
				      widget, TRUE);
      else
	{
	  GtkMenuShell *menu_shell = GTK_MENU_SHELL (widget->parent);

	  if (!menu_shell->active)
	    {
	      gtk_grab_add (GTK_WIDGET (menu_shell));
	      menu_shell->have_grab = TRUE;
	      menu_shell->active = TRUE;
	    }

	  gtk_menu_shell_select_item (GTK_MENU_SHELL (widget->parent), widget);
	}
    }
}

static gint
gtk_menu_item_select_timeout (gpointer data)
{
  GDK_THREADS_ENTER ();

  gtk_menu_item_select_timeout_unlocked (data);

  GDK_THREADS_LEAVE ();

  return FALSE;  
}

static void
gtk_menu_item_select_timeout_unlocked (gpointer data)
{
  GtkMenuItem *menu_item;

  menu_item = GTK_MENU_ITEM (data);
  menu_item->timer = 0;

  if (GTK_WIDGET_IS_SENSITIVE (menu_item->submenu))
    {
      gtk_menu_popup (GTK_MENU (menu_item->submenu),
		      GTK_WIDGET (menu_item)->parent,
		      GTK_WIDGET (menu_item),
		      gtk_menu_item_position_menu,
		      menu_item,
		      GTK_MENU_SHELL (GTK_WIDGET (menu_item)->parent)->button,
		      0);
      
      /* This is a bit of a hack - we want to select the first item
       * of menus hanging of a menu bar, but not for cascading submenus
       */
      if (GTK_IS_MENU_BAR (GTK_WIDGET (menu_item)->parent))
	{
	  GtkMenuShell *submenu = GTK_MENU_SHELL (menu_item->submenu);
	  if (submenu->children)
	    gtk_menu_shell_select_item (submenu, submenu->children->data);
	}
    }
}

static void
gtk_menu_item_position_menu (GtkMenu  *menu,
			     gint     *x,
			     gint     *y,
			     gpointer  user_data)
{
  GtkMenuItem *menu_item;
  GtkWidget *parent_menu_item;
  gint screen_width;
  gint screen_height;
  gint twidth, theight;
  gint tx, ty;

  g_return_if_fail (menu != NULL);
  g_return_if_fail (x != NULL);
  g_return_if_fail (y != NULL);

  menu_item = GTK_MENU_ITEM (user_data);

  twidth = GTK_WIDGET (menu)->requisition.width;
  theight = GTK_WIDGET (menu)->requisition.height;

  screen_width = gdk_screen_width ();
  screen_height = gdk_screen_height ();

  if (!gdk_window_get_origin (GTK_WIDGET (menu_item)->window, &tx, &ty))
    {
      g_warning ("Menu not on screen");
      return;
    }

  switch (menu_item->submenu_placement)
    {
    case GTK_TOP_BOTTOM:
      if ((ty + GTK_WIDGET (menu_item)->allocation.height + theight) <= screen_height)
	ty += GTK_WIDGET (menu_item)->allocation.height;
      else if ((ty - theight) >= 0)
	ty -= theight;
      else
	ty += GTK_WIDGET (menu_item)->allocation.height;

      break;

    case GTK_LEFT_RIGHT:
      menu_item->submenu_direction = GTK_DIRECTION_RIGHT;
      parent_menu_item = GTK_MENU (GTK_WIDGET (menu_item)->parent)->parent_menu_item;
      if (parent_menu_item)
	menu_item->submenu_direction = GTK_MENU_ITEM (parent_menu_item)->submenu_direction;

      switch (menu_item->submenu_direction)
	{
	case GTK_DIRECTION_LEFT:
	  if ((tx - twidth) >= 0)
	    tx -= twidth;
	  else
	    {
	      menu_item->submenu_direction = GTK_DIRECTION_RIGHT;
	      tx += GTK_WIDGET (menu_item)->allocation.width - 5;
	    }
	  break;

	case GTK_DIRECTION_RIGHT:
	  if ((tx + GTK_WIDGET (menu_item)->allocation.width + twidth - 5) <= screen_width)
	    tx += GTK_WIDGET (menu_item)->allocation.width - 5;
	  else
	    {
	      menu_item->submenu_direction = GTK_DIRECTION_LEFT;
	      tx -= twidth;
	    }
	  break;
	}

      ty += GTK_WIDGET (menu_item)->allocation.height / 4;

      break;
    }

  /* If we have negative, tx, ty here it is because we can't get
   * the menu all the way on screen. Favor the upper-left portion.
   */
  *x = CLAMP (tx, 0, MAX (0, screen_width - twidth));
  *y = CLAMP (ty, 0, MAX (0, screen_height - theight));
}

void
gtk_menu_item_right_justify(GtkMenuItem *menuitem)
{
  g_return_if_fail (menuitem != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menuitem));

  menuitem->right_justify = 1;
}


static void
gtk_menu_item_show_all (GtkWidget *widget)
{
  GtkMenuItem *menu_item;

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

  menu_item = GTK_MENU_ITEM (widget);

  /* show children including submenu */
  if (menu_item->submenu)
    gtk_widget_show_all (menu_item->submenu);
  gtk_container_foreach (GTK_CONTAINER (widget), (GtkCallback) gtk_widget_show_all, NULL);

  gtk_widget_show (widget);
}

static void
gtk_menu_item_hide_all (GtkWidget *widget)
{
  GtkMenuItem *menu_item;

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

  gtk_widget_hide (widget);

  menu_item = GTK_MENU_ITEM (widget);

  /* hide children including submenu */
  gtk_container_foreach (GTK_CONTAINER (widget), (GtkCallback) gtk_widget_hide_all, NULL);
  if (menu_item->submenu)
    gtk_widget_hide_all (menu_item->submenu);
}

static void
gtk_menu_item_forall (GtkContainer *container,
		      gboolean      include_internals,
		      GtkCallback   callback,
		      gpointer      callback_data)
{
  GtkBin *bin;
  GtkMenuItem *menu_item;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (container));
  g_return_if_fail (callback != NULL);

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

  if (bin->child)
    (* callback) (bin->child, callback_data);
  if (include_internals && menu_item->submenu)
    (* callback) (menu_item->submenu, callback_data);
}