Generic Function

Summary

Prints an item as a string.

Package

capi

Signature

print-collection-item item collection

Arguments

item

An item or an Lisp object.

collection

A collection or any Lisp object.

Description

The generic function print-collection-item prints item as a string. It is used when item is known to be an item in collection .

An item in a collection prints using the first of these which returns non-nil: the item's text , the item's print-function , the collection's print-function or the item's data . An item not known to be in the collection is printed simply using print-object.

The method on (t collection) uses the collection's print-function .

Example

(setq collection (make-instance

                  'capi:collection

                  :items '(1 2 3 4 5)

                  :print-function #'(lambda (x)

                                      (format nil

                                       "<~A:>"

                                       x))))

(capi:print-collection-item 2 collection)

In this example we provide our own print-collection-item method:

(defclass my-tree-view (capi:tree-view) ())

(defmethod capi:print-collection-item ((item capi:item)

                                       (tree my-tree-view))

  (string-capitalize (svref (capi:item-data item) 0)))

(capi:contain

 (make-instance 'my-tree-view

                :roots 

                (list (make-instance 'capi:item

                                     :data 

                                     (vector "foo")))))

See also

get-collection-item
collection