gtkcontainer.c

gtk是linux一款强大的夸平台的图形化开发工具

      /* Get a list of the containers children
       */
      children = NULL;
      gtk_container_forall (container,
			    gtk_container_children_callback,
			    &children);
      children = g_list_reverse (children);
      /* children = gtk_container_children (container); */

      if (children)
	{
	  /* Remove any children which are inappropriate for focus movement
	   */
	  tmp_list = children;
	  while (tmp_list)
	    {
	      if (GTK_WIDGET_IS_SENSITIVE (tmp_list->data) &&
		  GTK_WIDGET_DRAWABLE (tmp_list->data) &&
		  (GTK_IS_CONTAINER (tmp_list->data) || GTK_WIDGET_CAN_FOCUS (tmp_list->data)))
		tmp_list = tmp_list->next;
	      else
		{
		  tmp_list2 = tmp_list;
		  tmp_list = tmp_list->next;
		  
		  children = g_list_remove_link (children, tmp_list2);
		  g_list_free_1 (tmp_list2);
		}
	    }

	  switch (direction)
	    {
	    case GTK_DIR_TAB_FORWARD:
	    case GTK_DIR_TAB_BACKWARD:
	      return_val = gtk_container_focus_tab (container, children, direction);
	      break;
	    case GTK_DIR_UP:
	    case GTK_DIR_DOWN:
	      return_val = gtk_container_focus_up_down (container, children, direction);
	      break;
	    case GTK_DIR_LEFT:
	    case GTK_DIR_RIGHT:
	      return_val = gtk_container_focus_left_right (container, children, direction);
	      break;
	    }

	  g_list_free (children);
	}
    }

  return return_val;
}

static gint
gtk_container_focus_tab (GtkContainer     *container,
			 GList            *children,
			 GtkDirectionType  direction)
{
  GtkWidget *child;
  GtkWidget *child2;
  GList *tmp_list;
  guint length;
  guint i, j;

  length = g_list_length (children);

  /* sort the children in the y direction */
  for (i = 1; i < length; i++)
    {
      j = i;
      tmp_list = g_list_nth (children, j);
      child = tmp_list->data;

      while (j > 0)
	{
	  child2 = tmp_list->prev->data;
	  if (child->allocation.y < child2->allocation.y)
	    {
	      tmp_list->data = tmp_list->prev->data;
	      tmp_list = tmp_list->prev;
	      j--;
	    }
	  else
	    break;
	}

      tmp_list->data = child;
    }

  /* sort the children in the x direction while
   *  maintaining the y direction sort.
   */
  for (i = 1; i < length; i++)
    {
      j = i;
      tmp_list = g_list_nth (children, j);
      child = tmp_list->data;

      while (j > 0)
	{
	  child2 = tmp_list->prev->data;
	  if ((child->allocation.x < child2->allocation.x) &&
	      (child->allocation.y == child2->allocation.y))
	    {
	      tmp_list->data = tmp_list->prev->data;
	      tmp_list = tmp_list->prev;
	      j--;
	    }
	  else
	    break;
	}

      tmp_list->data = child;
    }

  /* if we are going backwards then reverse the order
   *  of the children.
   */
  if (direction == GTK_DIR_TAB_BACKWARD)
    children = g_list_reverse (children);

  return gtk_container_focus_move (container, children, direction);
}

static gint
gtk_container_focus_up_down (GtkContainer     *container,
			     GList            *children,
			     GtkDirectionType  direction)
{
  GtkWidget *child;
  GtkWidget *child2;
  GList *tmp_list;
  gint dist1, dist2;
  gint focus_x;
  gint focus_width;
  guint length;
  guint i, j;

  /* return failure if there isn't a focus child */
  if (container->focus_child)
    {
      focus_width = container->focus_child->allocation.width / 2;
      focus_x = container->focus_child->allocation.x + focus_width;
    }
  else
    {
      focus_width = GTK_WIDGET (container)->allocation.width;
      if (GTK_WIDGET_NO_WINDOW (container))
	focus_x = GTK_WIDGET (container)->allocation.x;
      else
	focus_x = 0;
    }

  length = g_list_length (children);

  /* sort the children in the y direction */
  for (i = 1; i < length; i++)
    {
      j = i;
      tmp_list = g_list_nth (children, j);
      child = tmp_list->data;

      while (j > 0)
	{
	  child2 = tmp_list->prev->data;
	  if (child->allocation.y < child2->allocation.y)
	    {
	      tmp_list->data = tmp_list->prev->data;
	      tmp_list = tmp_list->prev;
	      j--;
	    }
	  else
	    break;
	}

      tmp_list->data = child;
    }

  /* sort the children in distance in the x direction
   *  in distance from the current focus child while maintaining the
   *  sort in the y direction
   */
  for (i = 1; i < length; i++)
    {
      j = i;
      tmp_list = g_list_nth (children, j);
      child = tmp_list->data;
      dist1 = (child->allocation.x + child->allocation.width / 2) - focus_x;

      while (j > 0)
	{
	  child2 = tmp_list->prev->data;
	  dist2 = (child2->allocation.x + child2->allocation.width / 2) - focus_x;

	  if ((dist1 < dist2) &&
	      (child->allocation.y >= child2->allocation.y))
	    {
	      tmp_list->data = tmp_list->prev->data;
	      tmp_list = tmp_list->prev;
	      j--;
	    }
	  else
	    break;
	}

      tmp_list->data = child;
    }

  /* go and invalidate any widget which is too
   *  far from the focus widget.
   */
  if (!container->focus_child &&
      (direction == GTK_DIR_UP))
    focus_x += focus_width;

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

      dist1 = (child->allocation.x + child->allocation.width / 2) - focus_x;
      if (((direction == GTK_DIR_DOWN) && (dist1 < 0)) ||
	  ((direction == GTK_DIR_UP) && (dist1 > 0)))
	tmp_list->data = NULL;

      tmp_list = tmp_list->next;
    }

  if (direction == GTK_DIR_UP)
    children = g_list_reverse (children);

  return gtk_container_focus_move (container, children, direction);
}

static gint
gtk_container_focus_left_right (GtkContainer     *container,
				GList            *children,
				GtkDirectionType  direction)
{
  GtkWidget *child;
  GtkWidget *child2;
  GList *tmp_list;
  gint dist1, dist2;
  gint focus_y;
  gint focus_height;
  guint length;
  guint i, j;

  /* return failure if there isn't a focus child */
  if (container->focus_child)
    {
      focus_height = container->focus_child->allocation.height / 2;
      focus_y = container->focus_child->allocation.y + focus_height;
    }
  else
    {
      focus_height = GTK_WIDGET (container)->allocation.height;
      if (GTK_WIDGET_NO_WINDOW (container))
	focus_y = GTK_WIDGET (container)->allocation.y;
      else
	focus_y = 0;
    }

  length = g_list_length (children);

  /* sort the children in the x direction */
  for (i = 1; i < length; i++)
    {
      j = i;
      tmp_list = g_list_nth (children, j);
      child = tmp_list->data;

      while (j > 0)
	{
	  child2 = tmp_list->prev->data;
	  if (child->allocation.x < child2->allocation.x)
	    {
	      tmp_list->data = tmp_list->prev->data;
	      tmp_list = tmp_list->prev;
	      j--;
	    }
	  else
	    break;
	}

      tmp_list->data = child;
    }

  /* sort the children in distance in the y direction
   *  in distance from the current focus child while maintaining the
   *  sort in the x direction
   */
  for (i = 1; i < length; i++)
    {
      j = i;
      tmp_list = g_list_nth (children, j);
      child = tmp_list->data;
      dist1 = (child->allocation.y + child->allocation.height / 2) - focus_y;

      while (j > 0)
	{
	  child2 = tmp_list->prev->data;
	  dist2 = (child2->allocation.y + child2->allocation.height / 2) - focus_y;

	  if ((dist1 < dist2) &&
	      (child->allocation.x >= child2->allocation.x))
	    {
	      tmp_list->data = tmp_list->prev->data;
	      tmp_list = tmp_list->prev;
	      j--;
	    }
	  else
	    break;
	}

      tmp_list->data = child;
    }

  /* go and invalidate any widget which is too
   *  far from the focus widget.
   */
  if (!container->focus_child &&
      (direction == GTK_DIR_LEFT))
    focus_y += focus_height;

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

      dist1 = (child->allocation.y + child->allocation.height / 2) - focus_y;
      if (((direction == GTK_DIR_RIGHT) && (dist1 < 0)) ||
	  ((direction == GTK_DIR_LEFT) && (dist1 > 0)))
	tmp_list->data = NULL;

      tmp_list = tmp_list->next;
    }

  if (direction == GTK_DIR_LEFT)
    children = g_list_reverse (children);

  return gtk_container_focus_move (container, children, direction);
}

static gint
gtk_container_focus_move (GtkContainer     *container,
			  GList            *children,
			  GtkDirectionType  direction)
{
  GtkWidget *focus_child;
  GtkWidget *child;

  focus_child = container->focus_child;
  gtk_container_set_focus_child (container, NULL);

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

      if (!child)
	continue;

      if (focus_child)
        {
          if (focus_child == child)
            {
              focus_child = NULL;

              if (GTK_WIDGET_DRAWABLE (child) &&
		  GTK_IS_CONTAINER (child) &&
		  !GTK_WIDGET_HAS_FOCUS (child))
		if (gtk_container_focus (GTK_CONTAINER (child), direction))
		  return TRUE;
            }
        }
      else if (GTK_WIDGET_DRAWABLE (child))
        {
	  if (GTK_IS_CONTAINER (child))
            {
              if (gtk_container_focus (GTK_CONTAINER (child), direction))
                return TRUE;
            }
          else if (GTK_WIDGET_CAN_FOCUS (child))
            {
              gtk_widget_grab_focus (child);
              return TRUE;
            }
        }
    }

  return FALSE;
}


static void
gtk_container_children_callback (GtkWidget *widget,
				 gpointer   client_data)
{
  GList **children;

  children = (GList**) client_data;
  *children = g_list_prepend (*children, widget);
}

void
gtk_container_set_focus_vadjustment (GtkContainer  *container,
				     GtkAdjustment *adjustment)
{
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_CONTAINER (container));
  if (adjustment)
    g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));

  if (adjustment)
    gtk_object_ref (GTK_OBJECT(adjustment));

  gtk_object_set_data_by_id_full (GTK_OBJECT (container),
				  vadjustment_key_id,
				  adjustment,
				  (GtkDestroyNotify) gtk_object_unref);
}

void
gtk_container_set_focus_hadjustment (GtkContainer  *container,
				     GtkAdjustment *adjustment)
{
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_CONTAINER (container));
  if (adjustment)
    g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));

  if (adjustment)
    gtk_object_ref (GTK_OBJECT (adjustment));

  gtk_object_set_data_by_id_full (GTK_OBJECT (container),
				  hadjustment_key_id,
				  adjustment,
				  (GtkDestroyNotify) gtk_object_unref);
}


static void
gtk_container_show_all (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_CONTAINER (widget));

  gtk_container_foreach (GTK_CONTAINER (widget),
			 (GtkCallback) gtk_widget_show_all,
			 NULL);
  gtk_widget_show (widget);
}

static void
gtk_container_hide_all (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_CONTAINER (widget));

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