the gtk.CellAreaContext which has already been requested for widths.
the gtk.Widget where area will be rendering
the width for which to check the height of this area
location to store the minimum height, or NULL
location to store the natural height, or NULL
3.0
Retrieves a cell area’s minimum and natural height if it would be given the specified width.
area stores some geometrical information in context along the way while calling CellArea.getPreferredWidth. It’s important to perform a series of CellArea.getPreferredWidth requests with context first and then call CellArea.getPreferredHeightForWidth on each cell area individually to get the height for width of each fully requested row.
If at some point, the width of a single row changes, it should be requested with CellArea.getPreferredWidth again and then the full width of the requested rows checked again with CellArea.contextGetPreferredWidth.