gtkwidget.c

gtk是linux一款强大的夸平台的图形化开发工具

      break;
    case ARG_COMPOSITE_CHILD:
      GTK_VALUE_BOOL (*arg) = (GTK_WIDGET_COMPOSITE_CHILD (widget) != FALSE);
      break;
    case ARG_STYLE:
      GTK_VALUE_BOXED (*arg) = (gpointer) gtk_widget_get_style (widget);
      break;
    case ARG_EVENTS:
      eventp = gtk_object_get_data_by_id (GTK_OBJECT (widget), event_key_id);
      if (!eventp)
	GTK_VALUE_FLAGS (*arg) = 0;
      else
	GTK_VALUE_FLAGS (*arg) = *eventp;
      break;
    case ARG_EXTENSION_EVENTS:
      modep = gtk_object_get_data_by_id (GTK_OBJECT (widget), extension_event_key_id);
      if (!modep)
	GTK_VALUE_FLAGS (*arg) = 0;
      else
	GTK_VALUE_FLAGS (*arg) = *modep;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
    }
}

/*****************************************
 * gtk_widget_init:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

static void
gtk_widget_init (GtkWidget *widget)
{
  GdkColormap *colormap;
  GdkVisual *visual;
  
  GTK_PRIVATE_FLAGS (widget) = 0;
  widget->state = GTK_STATE_NORMAL;
  widget->saved_state = GTK_STATE_NORMAL;
  widget->name = NULL;
  widget->requisition.width = 0;
  widget->requisition.height = 0;
  widget->allocation.x = -1;
  widget->allocation.y = -1;
  widget->allocation.width = 1;
  widget->allocation.height = 1;
  widget->window = NULL;
  widget->parent = NULL;

  GTK_WIDGET_SET_FLAGS (widget,
			GTK_SENSITIVE |
			GTK_PARENT_SENSITIVE |
			(composite_child_stack ? GTK_COMPOSITE_CHILD : 0));

  widget->style = gtk_widget_peek_style ();
  gtk_style_ref (widget->style);
  
  colormap = gtk_widget_peek_colormap ();
  visual = gtk_widget_peek_visual ();
  
  if (colormap != gtk_widget_get_default_colormap ())
    gtk_widget_set_colormap (widget, colormap);

  if (visual != gtk_widget_get_default_visual ())
    gtk_widget_set_visual (widget, visual);
}

/*****************************************
 * gtk_widget_new:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

GtkWidget*
gtk_widget_new (GtkType      widget_type,
		const gchar *first_arg_name,
		...)
{
  GtkObject *object;
  va_list var_args;
  GSList *arg_list = NULL;
  GSList *info_list = NULL;
  gchar *error;
  
  g_return_val_if_fail (gtk_type_is_a (widget_type, GTK_TYPE_WIDGET), NULL);
  
  object = gtk_type_new (widget_type);
  
  va_start (var_args, first_arg_name);
  error = gtk_object_args_collect (GTK_OBJECT_TYPE (object),
				   &arg_list,
				   &info_list,
				   first_arg_name,
				   var_args);
  va_end (var_args);
  
  if (error)
    {
      g_warning ("gtk_widget_new(): %s", error);
      g_free (error);
    }
  else
    {
      GSList *slist_arg;
      GSList *slist_info;
      
      slist_arg = arg_list;
      slist_info = info_list;
      while (slist_arg)
	{
	  gtk_object_arg_set (object, slist_arg->data, slist_info->data);
	  slist_arg = slist_arg->next;
	  slist_info = slist_info->next;
	}
      gtk_args_collect_cleanup (arg_list, info_list);
    }
  
  if (!GTK_OBJECT_CONSTRUCTED (object))
    gtk_object_default_construct (object);

  return GTK_WIDGET (object);
}

/*****************************************
 * gtk_widget_newv:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

GtkWidget*
gtk_widget_newv (GtkType type,
		 guint	 nargs,
		 GtkArg *args)
{
  g_return_val_if_fail (gtk_type_is_a (type, GTK_TYPE_WIDGET), NULL);
  
  return GTK_WIDGET (gtk_object_newv (type, nargs, args));
}

/*****************************************
 * gtk_widget_get:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

void
gtk_widget_get (GtkWidget	*widget,
		GtkArg		*arg)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (widget));
  g_return_if_fail (arg != NULL);
  
  gtk_object_getv (GTK_OBJECT (widget), 1, arg);
}

/*****************************************
 * gtk_widget_getv:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

void
gtk_widget_getv (GtkWidget	*widget,
		 guint           nargs,
		 GtkArg         *args)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (widget));

  gtk_object_getv (GTK_OBJECT (widget), nargs, args);
}

/*****************************************
 * gtk_widget_set:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

void
gtk_widget_set (GtkWidget   *widget,
		const gchar *first_arg_name,
		...)
{
  GtkObject *object;
  va_list var_args;
  GSList *arg_list = NULL;
  GSList *info_list = NULL;
  gchar *error;

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

  object = GTK_OBJECT (widget);

  va_start (var_args, first_arg_name);
  error = gtk_object_args_collect (GTK_OBJECT_TYPE (object),
				   &arg_list,
				   &info_list,
				   first_arg_name,
				   var_args);
  va_end (var_args);

  if (error)
    {
      g_warning ("gtk_widget_set(): %s", error);
      g_free (error);
    }
  else
    {
      GSList *slist_arg;
      GSList *slist_info;

      slist_arg = arg_list;
      slist_info = info_list;
      while (slist_arg)
	{
	  gtk_object_arg_set (object, slist_arg->data, slist_info->data);
	  slist_arg = slist_arg->next;
	  slist_info = slist_info->next;
	}
      gtk_args_collect_cleanup (arg_list, info_list);
    }
}

/*****************************************
 * gtk_widget_setv:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

void
gtk_widget_setv (GtkWidget *widget,
		 guint	    nargs,
		 GtkArg	   *args)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (widget));

  gtk_object_setv (GTK_OBJECT (widget), nargs, args);
}

static inline void	   
gtk_widget_queue_clear_child (GtkWidget *widget)
{
  GtkWidget *parent;

  /* We check for GTK_WIDGET_IS_OFFSCREEN (widget), 
   * and queue_clear_area(parent...) will check the rest of
   * way up the tree with gtk_widget_is_offscreen (parent)
   */
  parent = widget->parent;
  if (parent && GTK_WIDGET_DRAWABLE (parent) &&
      !GTK_WIDGET_IS_OFFSCREEN (widget))
    gtk_widget_queue_clear_area (parent,
				 widget->allocation.x,
				 widget->allocation.y,
				 widget->allocation.width,
				 widget->allocation.height);
}

void
gtk_widget_unparent (GtkWidget *widget)
{
  GtkWidget *toplevel;
  GtkWidget *old_parent;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (widget));
  if (widget->parent == NULL)
    return;
  
  /* keep this function in sync with gtk_menu_detach()
   */

  /* unset focused and default children properly, this code
   * should eventually move into some gtk_window_unparent_branch() or
   * similar function.
   */
  
  toplevel = gtk_widget_get_toplevel (widget);
  if (GTK_CONTAINER (widget->parent)->focus_child == widget)
    {
      gtk_container_set_focus_child (GTK_CONTAINER (widget->parent), NULL);

      if (GTK_IS_WINDOW (toplevel))
	{
	  GtkWidget *child;
      
	  child = GTK_WINDOW (toplevel)->focus_widget;
	  
	  while (child && child != widget)
	    child = child->parent;
	  
	  if (child == widget)
	    gtk_window_set_focus (GTK_WINDOW (toplevel), NULL);
	}
    }
  if (GTK_IS_WINDOW (toplevel))
    {
      GtkWidget *child;
      
      child = GTK_WINDOW (toplevel)->default_widget;
      
      while (child && child != widget)
	child = child->parent;
      
      if (child == widget)
	gtk_window_set_default (GTK_WINDOW (toplevel), NULL);
    }

  if (GTK_WIDGET_REDRAW_PENDING (widget))
    gtk_widget_redraw_queue_remove (widget);

  if (GTK_IS_RESIZE_CONTAINER (widget))
    gtk_container_clear_resize_widgets (GTK_CONTAINER (widget));
  
  /* Remove the widget and all its children from any ->resize_widgets list
   * of all the parents in our branch. This code should move into gtkcontainer.c
   * somwhen, since we mess around with ->resize_widgets, which is
   * actually not of our business.
   *
   * Two ways to make this prettier:
   *   Write a g_slist_conditional_remove (GSList, gboolean (*)(gpointer))
   *   Change resize_widgets to a GList
   */
  toplevel = widget->parent;
  while (toplevel)
    {
      GSList *slist;
      GSList *prev;

      if (!GTK_CONTAINER (toplevel)->resize_widgets)
	{
	  toplevel = toplevel->parent;
	  continue;
	}

      prev = NULL;
      slist = GTK_CONTAINER (toplevel)->resize_widgets;
      while (slist)
	{
	  GtkWidget *child;
	  GtkWidget *parent;
	  GSList *last;

	  last = slist;
	  slist = last->next;
	  child = last->data;
	  
	  parent = child;
	  while (parent && (parent != widget))
	    parent = parent->parent;
	  
	  if (parent == widget)
	    {
	      GTK_PRIVATE_UNSET_FLAG (child, GTK_RESIZE_NEEDED);
	      
	      if (prev)
		prev->next = slist;
	      else
		GTK_CONTAINER (toplevel)->resize_widgets = slist;
	      
	      g_slist_free_1 (last);
	    }
	  else
	    prev = last;
	}

      toplevel = toplevel->parent;
    }

  gtk_widget_queue_clear_child (widget);

  /* Reset the width and height here, to force reallocation if we
   * get added back to a new parent. This won't work if our new
   * allocation is smaller than 1x1 and we actually want a size of 1x1...
   * (would 0x0 be OK here?)
   */
  widget->allocation.width = 1;
  widget->allocation.height = 1;
  
  if (GTK_WIDGET_REALIZED (widget) && !GTK_WIDGET_IN_REPARENT (widget))
    gtk_widget_unrealize (widget);

  old_parent = widget->parent;
  widget->parent = NULL;
  gtk_widget_set_parent_window (widget, NULL);
  gtk_signal_emit (GTK_OBJECT (widget), widget_signals[PARENT_SET], old_parent);
  
  gtk_widget_unref (widget);
}

/*****************************************
 * gtk_widget_destroy:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

void
gtk_widget_destroy (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (widget));
  g_return_if_fail (GTK_OBJECT_CONSTRUCTED (widget));

  gtk_object_destroy ((GtkObject*) widget);
}

/*****************************************
 * gtk_widget_destroyed:
 *   Utility function: sets widget_pointer 
 *   to NULL when widget is destroyed.
 *
 *   arguments:
 *
 *   results:
 *****************************************/

void
gtk_widget_destroyed (GtkWidget      *widget,
		      GtkWidget      **widget_pointer)
{
  /* Don't make any assumptions about the
   *  value of widget!
   *  Even check widget_pointer.
   */
  if (widget_pointer)
    *widget_pointer = NULL;
}

/*****************************************
 * gtk_widget_show:
 *
 *   arguments:
 *
 *   results:
 *****************************************/

void
gtk_widget_show (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (widget));
  
  if (!GTK_WIDGET_VISIBLE (widget))
    {
      if (!GTK_WIDGET_TOPLEVEL (widget))
	gtk_widget_queue_resize (widget);
      gtk_signal_emit (GTK_OBJECT (widget), widget_signals[SHOW]);
    }
}

static void
gtk_widget_real_show (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (widget));
  
  if (!GTK_WIDGET_VISIBLE (widget))
    {
      GTK_WIDGET_SET_FLAGS (widget, GTK_VISIBLE);