[SOLVED] Keycodes on non-Windows systems

[BigChimp]

For the SQLDB tutorial I was working on, chris_c gave a helpful hint. He ssuggested using a keyup event handler and catching the delete key, then use that to delete data from a dbgrid.

I got it working on Windows:

Code: [Select]

uses... LCLType
....
procedure TForm1.DBGrid1KeyUp(Sender: TObject; var Key: Word; Shift: TShiftState
  );
begin
  // Check for del key being hit and delete the current record in response
  if key=VK_DELETE then
  begin
    // database stuff here
  end;
end;

I vaguely remember though that lcltype is Windows only and one should use another unit for cross-platform compatibility... Am I right? If so, which one and where on the wiki is this documented?

If I'm wrong... well, it's been known to happen before

Thanks

[codifies]

On linux the delete key produces a keyup key of 46 which is the same value as VK_DELETE but it doesnt seem to be defined...

obviously we can't rely on the value 46 .....

[Leledumbo]

I vaguely remember though that lcltype is Windows only and one should use another unit for cross-platform compatibility... Am I right? If so, which one  and where on the wiki is this documented?

No, LCLType, LCLIntf and LCLProc is defined with Windows compatibility in mind, but everything there works on all platforms.

[codifies]

yeah just found LCLType myself after a bit of digging

VK_DELETE does work on Linux! (even if it is a windows key code - but then Delphi did have its roots firmly in windows...)

[BigChimp]

Thanks, Leledumbo & Chris (for adding the keycode info to the LCL Key Handling wiki page)

That nicely fits with my motto: "If it's not the wiki, it's not documented[1]"
[1] Of course, unless it is in the LCL.CHM and FPC pdfs/chms, but well... I'd rather edit the wiki. Much quicker and easier.

I added a link to LCL Key Handling in the Multiplatform Programming Guide...

[codifies]

damn i was busted  I can't claim it was in the wiki all along now!

[BigChimp]

Actually found that wiki page before asking the question... so I was very interested when I saw your name come by on the recently changed wiki page