gtk:tree-selection-selected (selection)

selection -- a gtk:tree-selection object

The gtk:tree-iter iterator for the selected node, or nil if there is no selected node.

Returns the iterator to the currently selected node if the selection mode is set to the :single or :browse values of the gtk:selection-mode enumeration. This function will not work if you use the :multiple selection mode. As a convenience the C implementation also gets the current model of the tree view wiget associated with the selection. Use the gtk:tree-selection-tree-view and gtk:tree-view-model functions instead to get the model.

(let* ((selection (gtk:tree-view-selection view))
       ;; This will only work in single or browse selection mode
       (iter (gtk:tree-selection-selected selection)))
  (if iter
      ;; A row is selected
      ...
      ;; No row is selected
      ...
  ... )