Capture Ctrl-Click on a TButton?

[Ian Branch 121]

Hi Team,

I have a TButton that does one thing, I want to capture a Ctrl-Click on that button so I can have it do some preprocessing before continuing.

How can I do that please?

 

Regards & TIA,

Ian

[dummzeuch 1399]

Use a normal OnClick event and check whether the Ctrl key is currently pressed. That's the only way I know.

function IsControlKeyPressed: Boolean;
begin
  Result := GetKeyState(VK_CONTROL) < 0;
end;

Source: https://tips.delphidabbler.com/tips/45

[Ian Branch 121]

Tks Thomas.

Ian

[programmerdelphi2k 235]

nevermind ... sorry

Edited April 29, 2023 by programmerdelphi2k

[Remy Lebeau 1264]

13 hours ago, dummzeuch said:

Use a normal OnClick event and check whether the Ctrl key is currently pressed. That's the only way I know.

Alternatively, the OnMouse(Down|Up) events have a Shift parameter which defines several flags, including ssCtrl, which is present when the Ctrl key is down when the event is triggered.

 

[programmerdelphi2k 235]

if the "Button" is focused, you can use its events togheter with mouse-click too

• but  "GetKeyState(VK_CONTROL) < 0";  is better, of course!

var
  LText: string;

procedure TForm1.Button1Click(Sender: TObject);
begin
  caption := LText + ' OnClick - 2º';
end;

procedure TForm1.Button1KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
  LText := Key.ToString; // Ctrl = 17
end;

procedure TForm1.Button1KeyUp(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
  LText := 'no key pressed';
end;

procedure TForm1.Button1MouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  caption := LText + ' OnMouseDown - 1º';
end;

 

Edited April 29, 2023 by programmerdelphi2k