public bool is_blank_at_pos (int x, int y, out TreePath? path, out unowned TreeViewColumn? column, out int cell_x, out int cell_y)
Determine whether the point (
y) in this is blank, that is no cell content nor an
expander arrow is drawn at the location.
If so, the location can be considered as the background. You might wish to take special action on clicks on the background, such as clearing a current selection, having a custom context menu or starting rubber banding.
y coordinate that are provided must be relative to bin_window coordinates. That is,
y must come from an event on this where `event->window == gtk_tree_view_get_bin_window ()`.
For converting widget coordinates (eg. the ones you get from GtkWidget:
GtkTreeView:query-tooltip), please see
The x position to be identified (relative to bin_window)
The y position to be identified (relative to bin_window)
A pointer to a TreePath pointer to be filled in, or null
A pointer to a TreeViewColumn pointer to be filled in, or null
A pointer where the X coordinate relative to the cell can be placed, or null
A pointer where the Y coordinate relative to the cell can be placed, or null
true if the area at the given coordinates is blank, false otherwise.