unit Unit1;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, ExtCtrls,
StdCtrls;
type
{ TForm1 }
TForm1 = class(TForm)
Button1: TButton;
PaintBox1: TPaintBox;
procedure Button1Click(Sender: TObject);
private
{ private declarations }
public
{ public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
{ TForm1 }
procedure TForm1.Button1Click(Sender: TObject);
begin
PaintBox1.Width := 50;
PaintBox1.Height := 50;
PaintBox1.Canvas.Rectangle(0, 0, PaintBox1.Height, PaintBox1.Width);
end;
end.
Dlaczego kwadracik pojawia się na ekranie dopiero po drugim naciśnięciu Button1?
Dlaczego problem znika po zakomentowaniu wierszy PaintBox1.Width := 50; PaintBox1.Height := 50;
?