滚动框鼠标滚轮delphi

Question

如何将OnMouseWheel两个滚动框添加到同一个表单？我应用了该方法，ScrollBox1但我不知道如何将该方法添加到ScrollBox2

procedure TForm3.FormMouseWheel(Sender: TObject; Shift: TShiftState;
  WheelDelta: Integer; MousePos: TPoint; var Handled: Boolean);
var
  LTopLeft, LTopRight, LBottomLeft, LBottomRight: SmallInt;
  LPoint: TPoint;
begin
   inherited;
  LPoint := ScrollBox1.ClientToScreen(Point(0,0));

  LTopLeft := LPoint.X;
  LTopRight := LTopLeft + ScrollBox1.Width;

  LBottomLeft := LPoint.Y;
  LBottomRight := LBottomLeft + ScrollBox1.Width;


  if (MousePos.X >= LTopLeft) and
    (MousePos.X <= LTopRight) and
    (MousePos.Y >= LBottomLeft)and
    (MousePos.Y <= LBottomRight) then
  begin
    ScrollBox1.VertScrollBar.Position :=
    ScrollBox1.VertScrollBar.Position - WheelDelta;

    Handled := True;
  end;
end;

Answer 1

将相同的处理程序分配给两个 ScrollBox 组件，而不是 Form，然后使用参数Sender来了解哪个组件正在调用该处理程序。

procedure TForm3.ScrollBoxMouseWheel(Sender: TObject;
  Shift: TShiftState; WheelDelta: Integer; MousePos: TPoint;
  var Handled: Boolean);
var
  LTopLeft, LTopRight, LBottomLeft, LBottomRight: SmallInt;
  LPoint: TPoint;
  ScrollBox: TScrollBox;
begin
  ScrollBox := TScrollBox(Sender);
  LPoint := ScrollBox.ClientToScreen(Point(0,0));
  LTopLeft := LPoint.X;
  LTopRight := LTopLeft + ScrollBox.ClientWidth;
  LBottomLeft := LPoint.Y;
  LBottomRight := LBottomLeft + ScrollBox.ClientWidth;
  if (MousePos.X >= LTopLeft) and
    (MousePos.X <= LTopRight) and
    (MousePos.Y >= LBottomLeft) and
    (MousePos.Y <= LBottomRight) then
  begin
    ScrollBox.VertScrollBar.Position := ScrollBox.VertScrollBar.Position - WheelDelta;
    Handled := True;
  end;
end;