The On Key Up EEP will execute when the user releases a key. Within the On Key Up EEP, the GETPROPERTY LastKeyUp parameter is accepted to recognize what key is released.
Syntax:
GETPROPERTY FormComponentID| 'LastKeyUp' 'iKeyCode'
Where:
•The returned integer value for iKeyCode is the virtual-key code of the of physical key on the keyboard.
Notes:
•The virtual-key code is not to be confused with the actual keyboard characters. See Virtual-Key Codes.
•The key code value returned by the LastKeyUp syntax is only recognized within the On Key Up EEP.
Capturing Shift, Ctrl, and Alt
The GETPROPERTY command also supports the recognition if the Shift, Ctrl, and Alt keys when pressed.
GETPROPERTY FormComponentID| 'ShiftIsPressed' 'iShiftIsPressed'
GETPROPERTY FormComponentID| 'CtrlIsPressed' 'iCtrlIsPressed'
GETPROPERTY FormComponentID| 'AltIsPressed' 'iAltIsPressed'
The returned integer value for ShiftIsPressed, CtrlIsPressed, and AltIsPressedand is 1 if the appropriate key is pressed. The returned value of 1 by the syntax is recognized within the "On Key Down", "On Key Press", and "On Key Up" EEPs.
Example:
-- To capture [F1] and display a custom Help file for a form
-- Form "On Before Start" EEP
SET VAR vIsKeyDown INTEGER = 0
RETURN
-- Form "On Key Up" EEP
IF vIsKeyDown = 1 THEN
RETURN
ENDIF
SET VAR vIsKeyDown = 1
SET VAR iKeyCode TEXT = NULL
GETPROPERTY TrapF1KeyForm| 'LastKeyUp' 'iKeyCode'
IF iKeyCode = '112' THEN
LAUNCH CustomHelpFile.chm
ENDIF
SET VAR vIsKeyDown = 0
RETURN
