Function

Summary

Displays a dialog box with a message and Yes and No buttons.

Package

capi

Signature

prompt-for-confirmation message &key screen owner cancel-button default-button continuation => result , successp

Arguments

message

A string.

screen

A screen.

owner

An owner window.

cancel-button

A boolean.

default-button

A keyword, or nil .

continuation

A function or nil .

Values

result

A boolean.

successp

A boolean.

Description

The function prompt-for-confirmation displays a dialog box containing message , with Yes and No buttons. When either Yes or No is pressed, it returns two values:

• a boolean indicating whether Yes was pressed
• t (for compatibility with other prompt functions)

cancel-button specifies whether a Cancel button also appears on the dialog. When Cancel is pressed, abort is called and the dialog is dismissed. The default value of cancel-button is nil .

default-button specifies which button has the input focus when the dialog appears (and is thus selected when the user immediately presses Return ).The value :ok means Yes , the value :cancel means Cancel , and any other value means No . The default value of default-button is nil .

owner specifies an owner window for the dialog. See the "Prompting for Input" chapter in the LispWorks CAPI User Guide for details.

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

Example

(capi:prompt-for-confirmation "Continue?")

(multiple-value-bind (res success)

    (capi:prompt-for-confirmation  "Yes, No or Cancel" 

                                   :cancel-button t)

  (if success

      res

    (abort)))

See also

confirm-yes-or-no