gtkoptionmenu.c

gtk是linux一款强大的夸平台的图形化开发工具

		     OPTION_INDICATOR_WIDTH - OPTION_INDICATOR_SPACING * 4,
		     button_area.y + (button_area.height - OPTION_INDICATOR_HEIGHT) / 2,
		     OPTION_INDICATOR_WIDTH, OPTION_INDICATOR_HEIGHT);
      
      if (GTK_WIDGET_HAS_FOCUS (widget))
	gtk_paint_focus (widget->style, widget->window,
			 area, widget, "button",
			 button_area.x - 1, 
			 button_area.y - 1, 
			 button_area.width + 1,
			 button_area.height + 1);
    }
}

static void
gtk_option_menu_draw (GtkWidget    *widget,
		      GdkRectangle *area)
{
  GtkWidget *child;
  GdkRectangle child_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))
    {
      gtk_option_menu_paint (widget, area);

      child = GTK_BIN (widget)->child;
      if (child && gtk_widget_intersect (child, area, &child_area))
	gtk_widget_draw (child, &child_area);
    }
}

static gint
gtk_option_menu_expose (GtkWidget      *widget,
			GdkEventExpose *event)
{
  GtkWidget *child;
  GdkEventExpose child_event;
  gint remove_child;

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

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


      /* The following code tries to draw the child in two places at
       * once. It fails miserably for several reasons
       *
       * - If the child is not no-window, removing generates
       *   more expose events. Bad, bad, bad.
       * 
       * - Even if the child is no-window, removing it now (properly)
       *   clears the space where it was, so it does no good
       */
      
#if 0
      remove_child = FALSE;
      child = GTK_BUTTON (widget)->child;

      if (!child)
	{
	  if (!GTK_OPTION_MENU (widget)->menu)
	    return FALSE;
	  gtk_option_menu_update_contents (GTK_OPTION_MENU (widget));
	  child = GTK_BUTTON (widget)->child;
	  if (!child)
	    return FALSE;
	  remove_child = TRUE;
	}

      child_event = *event;

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

      if (remove_child)
	gtk_option_menu_remove_contents (GTK_OPTION_MENU (widget));
#else
      remove_child = FALSE;
      child = GTK_BIN (widget)->child;
      child_event = *event;
      if (child && GTK_WIDGET_NO_WINDOW (child) &&
	  gtk_widget_intersect (child, &event->area, &child_event.area))
	gtk_widget_event (child, (GdkEvent*) &child_event);

#endif /* 0 */
    }

  return FALSE;
}

static gint
gtk_option_menu_button_press (GtkWidget      *widget,
			      GdkEventButton *event)
{
  GtkOptionMenu *option_menu;

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

  option_menu = GTK_OPTION_MENU (widget);

  if ((event->type == GDK_BUTTON_PRESS) &&
      (event->button == 1))
    {
      gtk_option_menu_remove_contents (option_menu);
      gtk_menu_popup (GTK_MENU (option_menu->menu), NULL, NULL,
		      gtk_option_menu_position, option_menu,
		      event->button, event->time);
      return TRUE;
    }

  return FALSE;
}

static gint
gtk_option_menu_key_press (GtkWidget   *widget,
			   GdkEventKey *event)
{
  GtkOptionMenu *option_menu;

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

  option_menu = GTK_OPTION_MENU (widget);

  switch (event->keyval)
    {
    case GDK_space:
      gtk_option_menu_remove_contents (option_menu);
      gtk_menu_popup (GTK_MENU (option_menu->menu), NULL, NULL,
		      gtk_option_menu_position, option_menu,
		      0, event->time);
      return TRUE;
    }
  
  return FALSE;
}

static void
gtk_option_menu_deactivate (GtkMenuShell  *menu_shell,
			    GtkOptionMenu *option_menu)
{
  g_return_if_fail (menu_shell != NULL);
  g_return_if_fail (option_menu != NULL);
  g_return_if_fail (GTK_IS_OPTION_MENU (option_menu));

  gtk_option_menu_update_contents (option_menu);
}

static void
gtk_option_menu_update_contents (GtkOptionMenu *option_menu)
{
  GtkWidget *child;
  GtkRequisition child_requisition;

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

  if (option_menu->menu)
    {
      gtk_option_menu_remove_contents (option_menu);

      option_menu->menu_item = gtk_menu_get_active (GTK_MENU (option_menu->menu));
      if (option_menu->menu_item)
	{
	  gtk_widget_ref (option_menu->menu_item);
	  child = GTK_BIN (option_menu->menu_item)->child;
	  if (child)
	    {
	      if (GTK_BIN (option_menu)->child)
		gtk_container_remove (GTK_CONTAINER (option_menu),
				      GTK_BIN (option_menu)->child);
	      if (GTK_WIDGET (option_menu)->state != child->state)
		gtk_widget_set_state (child, GTK_WIDGET (option_menu)->state);
	      gtk_widget_reparent (child, GTK_WIDGET (option_menu));
	    }

	  gtk_widget_size_request (child, &child_requisition);
	  gtk_widget_size_allocate (GTK_WIDGET (option_menu),
				    &(GTK_WIDGET (option_menu)->allocation));

	  if (GTK_WIDGET_DRAWABLE (option_menu))
	    gtk_widget_queue_draw (GTK_WIDGET (option_menu));
	}
    }
}

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

  if (GTK_BIN (option_menu)->child)
    {
      if (GTK_WIDGET (option_menu->menu_item)->state != GTK_BIN (option_menu)->child->state)
	gtk_widget_set_state (GTK_BIN (option_menu)->child,
			      GTK_WIDGET (option_menu->menu_item)->state);
      gtk_widget_reparent (GTK_BIN (option_menu)->child, option_menu->menu_item);
      gtk_widget_unref (option_menu->menu_item);
      option_menu->menu_item = NULL;
    }
}

static void
gtk_option_menu_calc_size (GtkOptionMenu *option_menu)
{
  GtkWidget *child;
  GList *children;
  GtkRequisition child_requisition;

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

  option_menu->width = 0;
  option_menu->height = 0;

  if (option_menu->menu)
    {
      children = GTK_MENU_SHELL (option_menu->menu)->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;

	  if (GTK_WIDGET_VISIBLE (child))
	    {
	      gtk_widget_size_request (child, &child_requisition);

	      option_menu->width = MAX (option_menu->width, child_requisition.width);
	      option_menu->height = MAX (option_menu->height, child_requisition.height);
	    }
	}
    }
}

static void
gtk_option_menu_position (GtkMenu  *menu,
			  gint     *x,
			  gint     *y,
			  gpointer  user_data)
{
  GtkOptionMenu *option_menu;
  GtkWidget *active;
  GtkWidget *child;
  GList *children;
  gint shift_menu;
  gint screen_width;
  gint screen_height;
  gint menu_xpos;
  gint menu_ypos;
  gint width;
  gint height;

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

  option_menu = GTK_OPTION_MENU (user_data);

  width = GTK_WIDGET (menu)->allocation.width;
  height = GTK_WIDGET (menu)->allocation.height;

  active = gtk_menu_get_active (GTK_MENU (option_menu->menu));
  children = GTK_MENU_SHELL (option_menu->menu)->children;
  gdk_window_get_origin (GTK_WIDGET (option_menu)->window, &menu_xpos, &menu_ypos);

  menu_ypos += GTK_WIDGET (option_menu)->allocation.height / 2 - 2;

  if (active != NULL)
    menu_ypos -= active->requisition.height / 2;

  while (children)
    {
      child = children->data;

      if (active == child)
	break;

      if (GTK_WIDGET_VISIBLE (child))
	menu_ypos -= child->allocation.height;

      children = children->next;
    }

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

  shift_menu = FALSE;
  if (menu_ypos < 0)
    {
      menu_ypos = 0;
      shift_menu = TRUE;
    }
  else if ((menu_ypos + height) > screen_height)
    {
      menu_ypos -= ((menu_ypos + height) - screen_height);
      shift_menu = TRUE;
    }

  if (shift_menu)
    {
      if ((menu_xpos + GTK_WIDGET (option_menu)->allocation.width + width) <= screen_width)
	menu_xpos += GTK_WIDGET (option_menu)->allocation.width;
      else
	menu_xpos -= width;
    }

  if (menu_xpos < 0)
    menu_xpos = 0;
  else if ((menu_xpos + width) > screen_width)
    menu_xpos -= ((menu_xpos + width) - screen_width);

  *x = menu_xpos;
  *y = menu_ypos;
}


static void
gtk_option_menu_show_all (GtkWidget *widget)
{
  GtkContainer *container;
  GtkOptionMenu *option_menu;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_OPTION_MENU (widget));
  container = GTK_CONTAINER (widget);
  option_menu = GTK_OPTION_MENU (widget);

  gtk_widget_show (widget);
  gtk_container_foreach (container, (GtkCallback) gtk_widget_show_all, NULL);
  if (option_menu->menu)
    gtk_widget_show_all (option_menu->menu);
  if (option_menu->menu_item)
    gtk_widget_show_all (option_menu->menu_item);
}


static void
gtk_option_menu_hide_all (GtkWidget *widget)
{
  GtkContainer *container;

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

  gtk_widget_hide (widget);
  gtk_container_foreach (container, (GtkCallback) gtk_widget_hide_all, NULL);
}