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4.0

Why is this not working (frames) ???

Asked by senad in Delphi Programming

Two panels on a form.On panel1 two buttons-panel2 is for showing frames:
The code:

unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls, dxsbar, dxGDIPlusClasses, ImgList, StdCtrls;
type
TFrames = (Frame2, Frame3);
TForm1 = class(TForm)
Panel1: TPanel;
Panel2: TPanel;
Button1: TButton;
Button2: TButton;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
Frame2, Frame3 : TFrame;
fActiveFrame: TFrames;
procedure SetActiveFrame(const Value: TFrames);
{ Private declarations }
public
property ActiveFrame : TFrames read fActiveFrame write SetActiveFrame;
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
Uses Unit2,Unit3;
procedure TForm1.SetActiveFrame(const Value: TFrames);
var
LastFrame : TFrames;
begin
if fActiveFrame <> Value then
begin
LastFrame := fActiveFrame;
fActiveFrame := Value;
case LastFrame of
Frame2 : Frame2.Parent := nil;
Frame3 : Frame3.Parent := nil;
end;
case fActiveFrame of
Frame2 : Frame2.Parent := Panel2;
Frame3 : Frame3.Parent := Panel2;
end;
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
Frame2 := TFrame.Create(nil);
Frame3 := TFrame.Create(nil);
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
FreeAndNil(Frame2);
FreeAndNil(Frame3);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
ActiveFrame := Frame2;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
ActiveFrame := Frame3;
end;
end.

I get :
[Error] Unit1.pas(51): Constant expression expected
[Error] Unit1.pas(81): Incompatible types: 'TFrames' and 'TFrame'

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Why is this not working (frames) ???

Asked by senad in Delphi Programming

About this solution