A callback function used by the gtk-tree-selection-set-select-function function to filter whether or not a row may be selected. It is called whenever the selection state of a row might change. A return value of true indicates to selection that it is okay to change the selection.

 lambda (selection model path selected)  

selection

A gtk-tree-selection object.

mode

A gtk-tree-model being viewed.

path

The gtk-tree-path instance of the row in question.

selected

True, if the path is currently selected.

Returns

True, if the selection state of the row can be toggled.