ScanCodeToRawKey

[bigandParticipant]

I have just updated to V1.1.08 and the ScanCodeToRawKey now throws this error:

“Error : Internal declaration ‘ScanCodeToRawKey’ cannot be accessed from here.”

The code still works fine in V1.1.07. This is on Mac OS Sierra 10.12.6.

A quick example:

Function AnyKey:Key()
Local i:Int,k:Key

For i=0 To 255
k=Keyboard.ScanCodeToRawKey(i)
If Keyboard.KeyDown(k)
Return(k)
Endif
Next
Return(Key.None)
End

[Mark SiblyKeymaster]

ScanCodeToRawKey is an internal function – it has been @hidden from docs, and should therefore be considered ‘use art your own risk’.

I’ve had to make it public in the past as monkey2 lacked an ‘Internal’ directive, ie: decls are visible to other module members only. But that has recently been added to monkey so I have made several methods/functions Internal.

What are you actually using it for?

[bigandParticipant]

Thanks for the info Mark.

Just using like the function above. Couldn’t think of a better way to check for “Any Key” being pressed.

Its not critical at all, it was just useful.

[nerobotParticipant]

@bigand

You can specify own application key filter and grab any keys:

Monkey

App.KeyEventFilter += Lambda( event:KeyEvent ) ' do something by key event End

1 2 3 4

App.KeyEventFilter += Lambda( event:KeyEvent )     ' do something by key event End

[AdamStrangeParticipant]

@nerobot erm. ok. why?
Why not use:
Method OnKeyEvent( event:KeyEvent ) Override
end method

Which is the normal way of trapping key codes. But not in this case cause he wants to check if a key is pressed, hence using scancode

[nerobotParticipant]

You can use App.KeyEventFilter in any place, but OnKeyEvent only inside of View-based classes like Window.

What if my key-logic know nothing about window?

[Mark SiblyKeymaster]

Just using like the function above. Couldn’t think of a better way to check for “Any Key” being pressed.

You don’t need to pass rawkeys to KeyDown, you can just pass a plain ‘virtual’ key, eg: ‘Key.A’ or ‘Key.Z’ etc.

But to pass an int ‘key’ to KeyDown you’ll need to convert it to a ‘Key’ type first – in fact, this is probably all your use of ScanCodeToRawKey is really achieving here – In this case, it doesn’t really matter whether you pass virtual keys or rawkeys or banana keys to KeyDown, since you’re just throwing every possible value at it!

To convert an int to a key, you can ‘Cast<Key>( n )’ it – example below. But as people have noted there are other ways to do this too.

Monkey

Namespace myapp #Import "<std>" #Import "<mojo>" Using std.. Using mojo.. Class MyWindow Extends Window Method New( title:String="Simple mojo app",width:Int=640,height:Int=480,flags:WindowFlags=Null ) Super.New( title,width,height,flags ) End Method OnRender( canvas:Canvas ) Override App.RequestRender() canvas.DrawText( "Hello World!",Width/2,Height/2,.5,.5 ) For Local i:=0 Until 512 Local key:=Cast<Key>( i ) If Keyboard.KeyDown( key ) Print "KeyDown:"+Keyboard.KeyName( key ) End End End Function Main() New AppInstance New MyWindow App.Run() End

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

Namespace myapp   #Import "<std>" #Import "<mojo>"   Using std.. Using mojo..   Class MyWindow Extends Window   Method New( title:String="Simple mojo app",width:Int=640,height:Int=480,flags:WindowFlags=Null )   Super.New( title,width,height,flags ) End   Method OnRender( canvas:Canvas ) Override App.RequestRender() canvas.DrawText( "Hello World!",Width/2,Height/2,.5,.5 )   For Local i:=0 Until 512 Local key:=Cast<Key>( i ) If Keyboard.KeyDown( key ) Print "KeyDown:"+Keyboard.KeyName( key ) End   End End   Function Main()   New AppInstance New MyWindow App.Run() End

[bigandParticipant]

Thanks again to all and I hadn’t even thought about casting. Such a simple change and totally negated using ScanCodeToRawKey.

Shows how little I know the language.

[Author]

Posts