---
name: "glutButtonBoxFunc"
section: "3"
platform: "linux"
package: "freeglut"
version: "3.8.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/glutButtonBoxFunc"
---

# glutButtonBoxFunc(3)

sets the dial & button box button callback for the current window.

## NAME

glutButtonBoxFunc - sets the dial & button box button callback for the current window.

## SYNTAX

```

```

void glutButtonBoxFunc(void (\*func)(int button, int state));

## ARGUMENTS

- *func*

  The new button box callback function.

## DESCRIPTION

glutButtonBoxFunc sets the dial & button box button callback for the current window. The dial & button box button callback for a window is called when the window has dial & button box input focus (normally, when the mouse is in the window) and the user generates dial & button box button presses. The button parameter will be the button number (starting at one). The number of available dial & button box buttons can be determined with glutDeviceGet(GLUT\_NUM\_BUTTON\_BOX\_BUTTONS). The state is either GLUT\_UP or GLUT\_DOWN indicating whether the callback was due to a release or press respectively.

Registering a dial & button box button callback when a dial & button box device is not available is ineffectual and not an error. In this case, no dial & button box button callbacks will be generated.

Passing NULL to glutButtonBoxFunc disables the generation of dial & button box button callbacks. When a new window is created, no dial & button box button callback is initially registered.

## SEE ALSO

glutDialsFunc, glutDeviceGet, glutSpaceballButtonFunc, glutTabletButtonFunc

## AUTHOR

Mark J. Kilgard (mjk@nvidia.com)