All Manuals > CAPI User Guide and Reference Manual > 21 CAPI Reference Entries

prompt-for-value Function

Summary

Prompts the user for a form to evaluate.

Package

capi

Signature

prompt-for-value message &key package initial-value value-function pane-args popup-args continuation => value, okp

Arguments
message
A string or nil.
package
A package or nil.
initial-value
A symbol.
value-function
A function, or nil.
pane-args
Arguments to pass to the pane.
popup-args
Arguments to pass to the confirmer.
continuation
A function or nil.
Values
value
A Lisp object.
okp
A boolean.
Description

The function prompt-for-value prompts the user for a form and returns the result of evaluating that form.

The form is read in package if specified or *package* if not and the result is the evaluation of the form.

If initial-value is supplied it provides a default form.

If value-function is supplied it overrides the default value function which reads the form and evaluates it.

message supplies a title for the dialog.

If continuation is non-nil, then it must be a function with a lambda list that accepts two arguments. continuation is called with the values that would normally be returned by prompt-for-value. On Cocoa, passing continuation causes the dialog to be made as a window-modal sheet and prompt-for-value returns immediately, leaving the dialog on the screen. The with-dialog-results macro provides a convenient way to create a continuation function.

The prompter is created by passing a text-input-pane to popup-confirmer. Arguments can be passed to the make-instance of the pane and the call to popup-confirmer using pane-args and popup-args respectively.

Examples
(capi:prompt-for-value 
 "Square" 
 :initial-value '(+ 1 2 3) 
 :value-function 
 #'(lambda (text) 
     (let ((res (eval (read-from-string text))))
       (* res res))))
See also

prompt-for-form


CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:32:42