Inside Macintosh: Mac OS 8 Toolbox Reference /

Chapter 2 - Control Manager Reference / Control Manager Types and Constants

Radio Button Value Constants

CHANGED WITH THE APPEARANCE MANAGER

These constants specify the value of a standard radio button control and are passed in the newValue parameter of SetControlValue and are returned by GetControlValue.

enum {
   kControlRadioButtonUncheckedValue = 0,
   kControlRadioButtonCheckedValue   = 1,
   kControlRadioButtonMixedValue     = 2 
};

Constant descriptions

kControlRadioButtonUncheckedValue

The radio button is unselected.

kControlRadioButtonCheckedValue

The radio button is selected.

kControlRadioButtonMixedValue

Mixed value. Indicates that a setting is on for some elements in a selection and off for others. This state only applies to standard Appearance-compliant radio buttons.

WHEN THE APPEARANCE MANAGER IS NOT AVAILABLE

Pre-Appearance radio buttons do not support the mixed state value constant kControlRadioButtonMixedValue.