The area a cell in the column will be allocated, or NULL. [allow-none]
location to return x offset of a cell relative to cell_area, or NULL. out[allow-none]
location to return y offset of a cell relative to cell_area, or NULL. out[allow-none]
location to return width needed to render a cell, or NULL. out[allow-none]
location to return height needed to render a cell, or NULL. out[allow-none]
Obtains the width and height needed to render the column. This is used primarily by the GtkTreeView.