A callback function which calculates display values from raw values in the model. It must fill value with the display value for the column column in the row indicated by iter.

Since this function is called for each data access, it is not a particularly efficient operation.

 lambda (model iter value column)  

model

The gtk-tree-model-filter object.

iter

A gtk-tree-iter iterator pointing to the row whose display values are determined.

value

A g-value which is already initialized for with the correct type for the column column.

column

An integer with the column whose display value is determined.