Qsyskey - Texas Instruments TI-89 Developer's Manual

Appendix A: System Routines — Keyboard

QSysKey

Declaration: BOOL QSysKey (WORD Key )
Category(ies): Keyboard
Description: Return TRUE if Key is a system key: MATH, CATALOG, CHAR, CUSTOM.
Inputs: Key — Key value.
Outputs: TRUE or FALSE.
Assumptions: None
Side Effects: None
Availability: All versions of the TI-89 / TI-92 Plus.
TI-89 / TI-92 Plus
Differences: None
See Also: QModeKey
Example: The menu system uses GKeyIn to get keys. It sets the GKF_MODAL and
GKF_SYS keys which cause GKeyIn to check for system or mode keys
and repush those keys onto the keyboard buffer and return KB_ESC. This
causes system and mode keys to exit menus and be acted on after the
menu is closed.
Key = GKeyIn( NULL, GKF_MODAL | GKF_SYS ); /* in menu code */
.
.
.
/* In the GKeyIn code, QSysKey and QModeKey are used to check for system and mode keys */
.
.
.
if ( ((Flags & GKF_SYS) && QSysKey(Key)) || ((Flags & GKF_MODAL) && QModeKey(Key)) )
{
GKeyPush( Key );
Key = KB_ESC;
}
TI-89 / TI-92 Plus Developer Guide Not for Distribution
653
Beta Version January 26, 2001