KEY(n): Difference between revisions
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(Created page with "'''KEY(n)''' assigns, enables, disables or suspends event trapping of a keypress by setting the flag ON, STOP or OFF. {{PageSyntax}} : KEY({{Parameter|number}}) {ON | OFF | STOP} {{PageDescription}} * Predefined and user defined KEY event number assignments to use with KEY(n): {{WhiteStart}} '''1 to 10'''.............Reserved '''F1 to F10''' function keys only. '''11, 12, 13 and 14'''...Reserved '''Up, Left, Right and Down''' numeric...") |
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{{PageDescription}} | {{PageDescription}} | ||
* Predefined and user defined KEY event number assignments to use with KEY(n): | * Predefined and user defined KEY event number assignments to use with KEY(n): | ||
{{WhiteStart}} '''1 to 10'''.............Reserved '''F1 to F10''' function keys only. | {{WhiteStart}} '''1 to 10'''.............Reserved '''F1 to F10''' function keys only. | ||
'''11, 12, 13 and 14'''...Reserved '''Up, Left, Right and Down''' numeric keypad arrows only | '''11, 12, 13 and 14'''...Reserved '''Up, Left, Right and Down''' numeric keypad arrows only | ||
| Line 13: | Line 13: | ||
'''30 and 31'''...........Reserved '''F11 and F12''' function keys only. | '''30 and 31'''...........Reserved '''F11 and F12''' function keys only. | ||
{{WhiteEnd}} | {{WhiteEnd}} | ||
* Keypresses can be read during [[INKEY$]], [[INPUT$]] or [[INPUT]] procedures without losing the input. | * Keypresses can be read during [[INKEY$]], [[INPUT$]] or [[INPUT]] procedures without losing the input. | ||
* Key event reads will also interrupt [[SLEEP]]. | * Key event reads will also interrupt [[SLEEP]]. | ||
* [[KEY(n)]] specific status modes are: | * [[KEY(n)]] specific status modes are: | ||
**'''ON''' enables specific keypress events to be monitored. | **'''ON''' enables specific keypress events to be monitored. | ||
**'''STOP''' suspends specific keypress reads, but remembers them. When re-enabled the key presses will be returned. | **'''STOP''' suspends specific keypress reads, but remembers them. When re-enabled the key presses will be returned. | ||
**'''OFF''' disables specified keypress reads and will not remember the event. | **'''OFF''' disables specified keypress reads and will not remember the event. | ||
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{{PageExamples}} | {{PageExamples}} | ||
''Example 1:'' How to trap the LEFT direction keys on both the dedicated cursor keypad and the numeric keypad. | ''Example 1:'' How to trap the LEFT direction keys on both the dedicated cursor keypad and the numeric keypad. | ||
{{CodeStart}} | {{CodeStart}} | ||
{{Cl|KEY n|KEY}} 15, {{Cl|CHR$}}(128) + {{Cl|CHR$}}(75) ' Assign trap for LEFT arrow key on the cursor keypad | {{Cl|KEY n|KEY}} 15, {{Cl|CHR$}}(128) + {{Cl|CHR$}}(75) ' Assign trap for LEFT arrow key on the cursor keypad | ||
{{Cl|ON KEY(n)|ON KEY(15)}} {{Cl|GOSUB}} CursorPad | {{Cl|ON KEY(n)|ON KEY(15)}} {{Cl|GOSUB}} CursorPad | ||
{{Cl|KEY(n)|KEY(15)}} {{Cl|ON}} ' enable event trapping | {{Cl|KEY(n)|KEY(15)}} {{Cl|ON}} ' enable event trapping | ||
{{Cl|ON KEY(n)|ON KEY(12)}} {{Cl|GOSUB}} NumericPad ' Trap LEFT key on number pad | {{Cl|ON KEY(n)|ON KEY(12)}} {{Cl|GOSUB}} NumericPad ' Trap LEFT key on number pad | ||
{{Cl|KEY(n)|KEY(12)}} {{Cl|ON}} ' enable event trapping | {{Cl|KEY(n)|KEY(12)}} {{Cl|ON}} ' enable event trapping | ||
DO | DO | ||
| Line 41: | Line 41: | ||
NumericPad: | NumericPad: | ||
PRINT "Pressed LEFT key on numeric keypad." | PRINT "Pressed LEFT key on numeric keypad." | ||
RETURN | RETURN | ||
{{CodeEnd}} | {{CodeEnd}} | ||
''Example 2:'' Trapping the F5 keypress. | ''Example 2:'' Trapping the F5 keypress. | ||
{{CodeStart}} | {{CodeStart}} | ||
{{Cl|KEY(n)|KEY(5)}} {{Cl|ON}} | {{Cl|KEY(n)|KEY(5)}} {{Cl|ON}} | ||
{{Cl|ON KEY(n)|ON KEY(5)}} {{Cl|GOSUB}} execute | {{Cl|ON KEY(n)|ON KEY(5)}} {{Cl|GOSUB}} execute | ||
| Line 57: | Line 57: | ||
{{Cl|SLEEP}} 1 | {{Cl|SLEEP}} 1 | ||
PRINT "Press any key to continue..." | PRINT "Press any key to continue..." | ||
SLEEP | SLEEP | ||
{{CodeEnd}} | {{CodeEnd}} | ||
Revision as of 01:52, 23 January 2023
KEY(n) assigns, enables, disables or suspends event trapping of a keypress by setting the flag ON, STOP or OFF.
Syntax
Description
- Predefined and user defined KEY event number assignments to use with KEY(n):
Template:WhiteStart 1 to 10.............Reserved F1 to F10 function keys only.
11, 12, 13 and 14...Reserved Up, Left, Right and Down numeric keypad arrows only
15 to 29............user-defined keys using value: CHR$(keyflag) + CHR$(scancode)
30 and 31...........Reserved F11 and F12 function keys only.
- Keypresses can be read during INKEY$, INPUT$ or INPUT procedures without losing the input.
- Key event reads will also interrupt SLEEP.
- KEY(n) specific status modes are:
- ON enables specific keypress events to be monitored.
- STOP suspends specific keypress reads, but remembers them. When re-enabled the key presses will be returned.
- OFF disables specified keypress reads and will not remember the event.
Examples
Example 1: How to trap the LEFT direction keys on both the dedicated cursor keypad and the numeric keypad.
KEY 15, CHR$(128) + CHR$(75) ' Assign trap for LEFT arrow key on the cursor keypad ON KEY(15) GOSUB CursorPad KEY(15) ON ' enable event trapping ON KEY(12) GOSUB NumericPad ' Trap LEFT key on number pad KEY(12) ON ' enable event trapping DO LOOP UNTIL UCASE$(INKEY$) = "Q" ' Idle loop for demo SYSTEM CursorPad: PRINT "Pressed LEFT key on cursor keypad." RETURN NumericPad: PRINT "Pressed LEFT key on numeric keypad." RETURN |
Example 2: Trapping the F5 keypress.
KEY(5) ON ON KEY(5) GOSUB execute PRINT "Press F5 (or ESC) to quit!)" DO LOOP UNTIL INKEY$ = CHR$(27) ' idle loop SYSTEM execute: PRINT "You pressed the F5 key..." SLEEP 1 PRINT "Press any key to continue..." SLEEP |
See also
- ON KEY(n), KEY n (softkeys)
- _KEYHIT, _KEYDOWN
- Keyboard scancodes