SpeedButton

[KodeZwerg]

Auf SO habe ich eine Interessante Methode gefunden, aber vermutlich nützt das auch nichts wegen der Handle Geschichte.

Delphi-Quellcode:

function FindSubcontrolAtPos(AControl: TControl; AScreenPos, AClientPos: TPoint): TControl;
var
  i: Integer;
  C: TControl;
begin
  Result := nil;
  C := AControl;
  if (C=nil) or not C.Visible or not TRect.Create(C.Left, C.Top, C.Left+C.Width, C.Top+C.Height).Contains(AClientPos) then
    Exit;
  Result := AControl;
  if AControl is TWinControl then
    for i := 0 to TWinControl(AControl).ControlCount-1 do
    begin
      C := FindSubcontrolAtPos(TWinControl(AControl).Controls[i], AScreenPos, AControl.ScreenToClient(AScreenPos));
      if C<>nil then
        Result := C;
    end;
end;

function FindControlAtPos(AScreenPos: TPoint): TControl;
var
  i: Integer;
  f,m: TForm;
  p: TPoint;
  r: TRect;
begin
  Result := nil;
  for i := Screen.FormCount-1 downto 0 do
    begin
      f := Screen.Forms[i];
      if f.Visible and (f.Parent=nil) and (f.FormStyle<>fsMDIChild) and 
        TRect.Create(f.Left, f.Top, f.Left+f.Width, f.Top+f.Height).Contains(AScreenPos) 
      then
        Result := f; 
    end;
  Result := FindSubcontrolAtPos(Result, AScreenPos, AScreenPos);
  if (Result is TForm) and (TForm(Result).ClientHandle<>0) then
  begin
    WinAPI.Windows.GetWindowRect(TForm(Result).ClientHandle, r);
    p := TPoint.Create(AScreenPos.X-r.Left, AScreenPos.Y-r.Top);
    m := nil;
    for i := TForm(Result).MDIChildCount-1 downto 0 do
    begin
      f := TForm(Result).MDIChildren[i];
      if TRect.Create(f.Left, f.Top, f.Left+f.Width, f.Top+f.Height).Contains(p) then
        m := f; 
    end;
    if m<>nil then
      Result := FindSubcontrolAtPos(m, AScreenPos, p);
  end;
end;

Das soll es einem ermöglichen in Fremd-Anwendungen das Control unter der Maus zu ermitteln. Ich habe es noch nicht getestet.