the gtk.widget.Widget that area is rendering onto
the gtk.cell_renderer.CellRenderer in area to activate
the gdk.event.Event for which cell activation should occur
the gtk.types.Rectangle in widget relative coordinates of renderer for the current row.
the gtk.cell_renderer.CellRendererState for renderer
whether cell activation was successful
This is used by gtk.cell_area.CellArea subclasses when handling events to activate cells, the base gtk.cell_area.CellArea class activates cells for keyboard events for free in its own GtkCellArea->activate() implementation.