gtk-widget-preferred-height-and-baseline-for-width (widget width)

widget -- a gtk-widget object
width -- an integer with the width which is available for allocation, or -1 if none

min-height -- an integer with the minimum height, or nil
nat-height -- an integer with the natural height, or nil
min-baseline -- an integer with the baseline for the minimum height, or nil
nat-baseline -- an integer with the baseline for the natural height, or nil

Retrieves the minimum and natural height of the widget and the corresponding baselines if it would be given the specified width, or the default height if width is -1. The baselines may be -1 which means that no baseline is requested for this widget.

The returned request will be modified by the adjust_size_request and adjust_baseline_request virtual methods and by any gtk-size-group objects that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.