gtklist.c

gtk是linux一款强大的夸平台的图形化开发工具

  if (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list))
    gtk_list_end_drag_selection (list);

  if (list->selection_mode == GTK_SELECTION_EXTENDED && list->anchor >= 0)
    gtk_list_end_selection (list);

  container = GTK_CONTAINER (list);

  switch (list->selection_mode)
    {
    case GTK_SELECTION_BROWSE:
      if (container->focus_child)
	{
	  gtk_list_select_child (list, container->focus_child);
	  return;
	}
      break;
    case GTK_SELECTION_EXTENDED:
      g_list_free (list->undo_selection);
      g_list_free (list->undo_unselection);
      list->undo_selection = NULL;
      list->undo_unselection = NULL;

      if (list->children &&
	  GTK_WIDGET_STATE (list->children->data) != GTK_STATE_SELECTED)
	gtk_list_fake_toggle_row (list, GTK_WIDGET (list->children->data));

      list->anchor_state =  GTK_STATE_SELECTED;
      list->anchor = 0;
      list->drag_pos = 0;
      list->undo_focus_child = container->focus_child;
      gtk_list_update_extended_selection (list, g_list_length(list->children));
      gtk_list_end_selection (list);
      return;
    case GTK_SELECTION_MULTIPLE:
      for (work = list->children; work; work = work->next)
	{
	  if (GTK_WIDGET_STATE (work->data) == GTK_STATE_NORMAL)
	    gtk_list_select_child (list, GTK_WIDGET (work->data));
	}
      return;
    default:
      break;
    }
}

void
gtk_list_unselect_all (GtkList *list)
{
  GtkContainer *container;
  GtkWidget *item;
  GList *work;
 
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  if (!list->children)
    return;

  if (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list))
    gtk_list_end_drag_selection (list);

  if (list->selection_mode == GTK_SELECTION_EXTENDED && list->anchor >= 0)
    gtk_list_end_selection (list);

  container = GTK_CONTAINER (list);

  switch (list->selection_mode)
    {
    case GTK_SELECTION_BROWSE:
      if (container->focus_child)
	{
	  gtk_list_select_child (list, container->focus_child);
	  return;
	}
      break;
    case GTK_SELECTION_EXTENDED:
      gtk_list_reset_extended_selection (list);
      break;
    default:
      break;
    }

  work = list->selection;

  while (work)
    {
      item = work->data;
      work = work->next;
      gtk_list_unselect_child (list, item);
    }
}

void
gtk_list_extend_selection (GtkList       *list,
			   GtkScrollType  scroll_type,
			   gfloat         position,
			   gboolean       auto_start_selection)
{
  GtkContainer *container;

  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  if ((gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list)) ||
      list->selection_mode != GTK_SELECTION_EXTENDED)
    return;

  container = GTK_CONTAINER (list);

  if (auto_start_selection)
    {
      gint focus_row;

      focus_row = g_list_index (list->children, container->focus_child);
      gtk_list_set_anchor (list, list->add_mode, focus_row,
			   container->focus_child);
    }
  else if (list->anchor < 0)
    return;

  gtk_list_move_focus_child (list, scroll_type, position);
  gtk_list_update_extended_selection 
    (list, g_list_index (list->children, container->focus_child));
}

void
gtk_list_end_drag_selection (GtkList *list)
{
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  list->drag_selection = FALSE;
  if (GTK_WIDGET_HAS_GRAB (list))
    {
      gtk_grab_remove (GTK_WIDGET (list));
      if (gdk_pointer_is_grabbed())
	gdk_pointer_ungrab (GDK_CURRENT_TIME);
    }
  if (list->htimer)
    {
      gtk_timeout_remove (list->htimer);
      list->htimer = 0;
    }
  if (list->vtimer)
    {
      gtk_timeout_remove (list->vtimer);
      list->vtimer = 0;
    }
}

void
gtk_list_start_selection (GtkList *list)
{
  GtkContainer *container;
  gint focus_row;

  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  if (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list))
    return;

  container = GTK_CONTAINER (list);

  if ((focus_row = g_list_index (list->selection, container->focus_child))
      >= 0)
    gtk_list_set_anchor (list, list->add_mode,
			 focus_row, container->focus_child);
}

void
gtk_list_end_selection (GtkList *list)
{
  gint i;
  gint e;
  gboolean top_down;
  GList *work;
  GtkWidget *item;
  gint item_index;

  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  if ((gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list)) ||
      list->anchor < 0)
    return;

  i = MIN (list->anchor, list->drag_pos);
  e = MAX (list->anchor, list->drag_pos);

  top_down = (list->anchor < list->drag_pos);

  list->anchor = -1;
  list->drag_pos = -1;
  
  if (list->undo_selection)
    {
      work = list->selection;
      list->selection = list->undo_selection;
      list->undo_selection = work;
      work = list->selection;
      while (work)
	{
	  item = work->data;
	  work = work->next;
	  item_index = g_list_index (list->children, item);
	  if (item_index < i || item_index > e)
	    {
	      gtk_widget_set_state (item, GTK_STATE_SELECTED);
	      gtk_list_unselect_child (list, item);
	      list->undo_selection = g_list_prepend (list->undo_selection,
						     item);
	    }
	}
    }    

  if (top_down)
    {
      for (work = g_list_nth (list->children, i); i <= e;
	   i++, work = work->next)
	{
	  item = work->data;
	  if (g_list_find (list->selection, item))
	    {
	      if (item->state == GTK_STATE_NORMAL)
		{
		  gtk_widget_set_state (item, GTK_STATE_SELECTED);
		  gtk_list_unselect_child (list, item);
		  list->undo_selection = g_list_prepend (list->undo_selection,
							 item);
		}
	    }
	  else if (item->state == GTK_STATE_SELECTED)
	    {
	      gtk_widget_set_state (item, GTK_STATE_NORMAL);
	      list->undo_unselection = g_list_prepend (list->undo_unselection,
						       item);
	    }
	}
    }
  else
    {
      for (work = g_list_nth (list->children, e); i <= e;
	   e--, work = work->prev)
	{
	  item = work->data;
	  if (g_list_find (list->selection, item))
	    {
	      if (item->state == GTK_STATE_NORMAL)
		{
		  gtk_widget_set_state (item, GTK_STATE_SELECTED);
		  gtk_list_unselect_child (list, item);
		  list->undo_selection = g_list_prepend (list->undo_selection,
							 item);
		}
	    }
	  else if (item->state == GTK_STATE_SELECTED)
	    {
	      gtk_widget_set_state (item, GTK_STATE_NORMAL);
	      list->undo_unselection = g_list_prepend (list->undo_unselection,
						       item);
	    }
	}
    }

  for (work = g_list_reverse (list->undo_unselection); work; work = work->next)
    gtk_list_select_child (list, GTK_WIDGET (work->data));


}

void
gtk_list_toggle_row (GtkList   *list,
		     GtkWidget *item)
{
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));
  g_return_if_fail (item != NULL);
  g_return_if_fail (GTK_IS_LIST_ITEM (item));

  switch (list->selection_mode)
    {
    case GTK_SELECTION_EXTENDED:
    case GTK_SELECTION_MULTIPLE:
    case GTK_SELECTION_SINGLE:
      if (item->state == GTK_STATE_SELECTED)
	{
	  gtk_list_unselect_child (list, item);
	  return;
	}
    case GTK_SELECTION_BROWSE:
      gtk_list_select_child (list, item);
      break;
    }
}

void
gtk_list_toggle_focus_row (GtkList *list)
{
  GtkContainer *container;
  gint focus_row;

  g_return_if_fail (list != 0);
  g_return_if_fail (GTK_IS_LIST (list));

  container = GTK_CONTAINER (list);

  if ((gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list)) ||
      !container->focus_child)
    return;

  switch (list->selection_mode)
    {
    case  GTK_SELECTION_SINGLE:
    case  GTK_SELECTION_MULTIPLE:
      gtk_list_toggle_row (list, container->focus_child);
      break;
    case GTK_SELECTION_EXTENDED:
      if ((focus_row = g_list_index (list->children, container->focus_child))
	  < 0)
	return;

      g_list_free (list->undo_selection);
      g_list_free (list->undo_unselection);
      list->undo_selection = NULL;
      list->undo_unselection = NULL;

      list->anchor = focus_row;
      list->drag_pos = focus_row;
      list->undo_focus_child = container->focus_child;

      if (list->add_mode)
	gtk_list_fake_toggle_row (list, container->focus_child);
      else
	gtk_list_fake_unselect_all (list, container->focus_child);
      
      gtk_list_end_selection (list);
      break;
    default:
      break;
    }
}

void
gtk_list_toggle_add_mode (GtkList *list)
{
  GtkContainer *container;

  g_return_if_fail (list != 0);
  g_return_if_fail (GTK_IS_LIST (list));
  
  if ((gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list)) ||
      list->selection_mode != GTK_SELECTION_EXTENDED)
    return;
  
  container = GTK_CONTAINER (list);

  if (list->add_mode)
    {
      list->add_mode = FALSE;
      list->anchor_state = GTK_STATE_SELECTED;
    }
  else
    list->add_mode = TRUE;
  
  if (container->focus_child)
    gtk_widget_queue_draw (container->focus_child);
}

void
gtk_list_undo_selection (GtkList *list)
{
  GList *work;

  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));

  if (list->selection_mode != GTK_SELECTION_EXTENDED ||
      (gdk_pointer_is_grabbed () && GTK_WIDGET_HAS_GRAB (list)))
    return;
  
  if (list->anchor >= 0)
    gtk_list_end_selection (list);

  if (!(list->undo_selection || list->undo_unselection))
    {
      gtk_list_unselect_all (list);
      return;
    }

  for (work = list->undo_selection; work; work = work->next)
    gtk_list_select_child (list, GTK_WIDGET (work->data));

  for (work = list->undo_unselection; work; work = work->next)
    gtk_list_unselect_child (list, GTK_WIDGET (work->data));

  if (list->undo_focus_child)
    {
      GtkContainer *container;

      container = GTK_CONTAINER (list);

      if (container->focus_child &&
	  GTK_WIDGET_HAS_FOCUS (container->focus_child))
	gtk_widget_grab_focus (list->undo_focus_child);
      else
	gtk_container_set_focus_child (container, list->undo_focus_child);
    }

  list->undo_focus_child = NULL;
 
  g_list_free (list->undo_selection);
  g_list_free (list->undo_unselection);
  list->undo_selection = NULL;
  list->undo_unselection = NULL;
}


/* Private GtkList Selection Methods :
 *
 * gtk_real_list_select_child
 * gtk_real_list_unselect_child
 */
static void
gtk_real_list_select_child (GtkList   *list,
			    GtkWidget *child)
{
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));
  g_return_if_fail (child != NULL);
  g_return_if_fail (GTK_IS_LIST_ITEM (child));

  switch (child->state)
    {
    case GTK_STATE_SELECTED:
    case GTK_STATE_INSENSITIVE:
      break;
    default:
      gtk_list_item_select (GTK_LIST_ITEM (child));
      break;
    }
}

static void
gtk_real_list_unselect_child (GtkList	*list,
			      GtkWidget *child)
{
  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));
  g_return_if_fail (child != NULL);
  g_return_if_fail (GTK_IS_LIST_ITEM (child));

  if (child->state == GTK_STATE_SELECTED)
    gtk_list_item_deselect (GTK_LIST_ITEM (child));
}


/* Private GtkList Selection Functions :
 *
 * gtk_list_set_anchor
 * gtk_list_fake_unselect_all
 * gtk_list_fake_toggle_row
 * gtk_list_update_extended_selection
 * gtk_list_reset_extended_selection
 */
static void
gtk_list_set_anchor (GtkList   *list,
		     gboolean   add_mode,
		     gint       anchor,
		     GtkWidget *undo_focus_child)
{
  GList *work;

  g_return_if_fail (list != NULL);
  g_return_if_fail (GTK_IS_LIST (list));
  
  if (list->selection_mode != GTK_SELECTION_EXTENDED || list->anchor >= 0)
    return;

  g_list_free (list->undo_selection);
  g_list_free (list->undo_unselection);
  list->undo_selection = NULL;
  list->undo_unselection = NULL;

  if ((work = g_list_nth (list->children, anchor)))
    {
      if (add_mode)
	gtk_list_fake_toggle_row (list, GTK_WIDGET (work->data));
      else
	{
	  gtk_list_fake_unselect_all (list, GTK_WIDGET (work->data));
	  list->anchor_state = GTK_STATE_SELECTED;
	}
    }

  list->anchor = anchor;
  list->drag_pos = anchor;
  list->undo_focus_child = undo_focus_child;
}

static void
gtk_list_fake_unselect_all (GtkList   *list,
			    GtkWidget *item)
{
  GList *work;

  if (item && item->state == GTK_STATE_NORMAL)
    gtk_widget_set_state (item, GTK_STATE_SELECTED);

  list->undo_selection = list->selection;
  list->selection = NULL;
  
  for (work = list->undo_selection; work; work = work->next)
    if (work->data != item)
      gtk_widget_set_state (GTK_WIDGET (work->data), GTK_STATE_NORMAL);
}

static void
gtk_list_fake_toggle_row (GtkList   *list,
			  GtkWidget *item)
{
  if (!item)
    return;