glutKeyboardUpFunc(3GLUT) GLUT glutKeyboardUpFunc(3GLUT)NAMEglutKeyboardUpFunc - sets the keyboard up (key release) callback for
the current window.
SYNTAX
void glutKeyboardUpFunc(void (*func)(unsigned char key,
int x, int y));
ARGUMENTS
func The new keyboard up callback function.
DESCRIPTION
glutKeyboardFunc sets the keyboard up (key release) callback for the
current window. When a user types into the window, each key release
matching an ASCII character will generate a keyboard up callback. The
key callback parameter is the generated ASCII character. The state of
modifier keys such as Shift cannot be determined directly; their only
effect will be on the returned ASCII data. The x and y callback parame‐
ters indicate the mouse location in window relative coordinates when
the key was pressed. When a new window is created, no keyboard callback
is initially registered, and ASCII key strokes in the window are
ignored. Passing NULL to glutKeyboardFunc disables the generation of
keyboard callbacks.
During a keyboard up callback, glutGetModifiers may be called to deter‐
mine the state of modifier keys when the keystroke generating the call‐
back occurred.
To avoid the reporting of key release/press pairs due to auto repeat,
use glutIgnoreKeyRepeat to ignore auto repeated keystrokes.
There is no guarantee that the keyboard press callback will match the
exact ASCII character as the keyboard up callback. For example, the
key down may be for a lowercase b, but the key release may report an
uppercase B if the shift state has changed. The same applies to sym‐
bols and control characters. The precise behavior is window system
dependent.
Use glutSpecialUpFunc for a means to detect non-ASCII key releases.
SEE ALSO
glutKeyboardFunc, glutSpecialUpFunc, glutSpecialFunc, glutCreateWindow,
glutMouseFunc, glutSpaceballButtonFunc, glutButtonBoxFunc, glutTablet‐
ButtonFunc, glutGetModifiers, glutIgnoreKeyRepeat
AUTHOR
Mark J. Kilgard (mjk@nvidia.com)
GLUT 3.7 glutKeyboardUpFunc(3GLUT)
