Mega Code Archive
Translate keyboard events for the whole application
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Title: Translate keyboard events for the whole application
Question: How to handle keyboard events application wide ?
Answer:
To handle keyboard-events application wide, there must be a handler procedure for Application.OnMessage:
procedure TForm1.FormCreate(Sender: TObject);
begin
Application.OnMessage := AppOnMessage;
end;
procedure TForm1.AppOnMessage(var Msg: TMsg; var Handled: Boolean);
var ccode: Word;
begin
case Msg.Message of
WM_KEYDOWN, WM_KEYUP:
begin
If (GetKeyState( VK_NUMLOCK ) = 0) //NumLock not active
and ((Msg.lparam and $1000000) = 0) //not a gray key
then
begin
ccode := 0;
case Msg.wparam of
VK_HOME: ccode := VK_NUMPAD7;
VK_UP : ccode := VK_NUMPAD8;
VK_PRIOR: ccode := VK_NUMPAD9;
VK_LEFT: ccode := VK_NUMPAD4;
VK_CLEAR: ccode := VK_NUMPAD5;
VK_RIGHT: ccode := VK_NUMPAD6;
VK_END : ccode := VK_NUMPAD1;
VK_DOWN : ccode := VK_NUMPAD2;
VK_NEXT : ccode := VK_NUMPAD3;
VK_INSERT:ccode := VK_NUMPAD0;
VK_DELETE:ccode := VK_DECIMAL;
end;
If ccode 0 then Msg.Wparam := ccode;
end;
end;
end;
end;
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