udrawfocusrect.pas

Delphi Win32核心API参考光盘源码 本书包含了常用的Windows API函数

unit UDrawFocusRect;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Grids;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
var
  MyRect: TRect; // the focus rectangle coordinates
begin
  {set up the rectangle}
  MyRect := Rect(14, 10, 151, 90);

  {draw the focus rectangle}
  if not(DrawFocusRect(Canvas.Handle, MyRect)) then
    ShowMessage('DrawFocusRect not working');
end;

end.