Автор: Xavier Pacheco

{
Copyright © 1998 by Delphi 4 Developer's Guide - Xavier Pacheco and Steve Teixeira
}

unit NewChildFrm;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ChildFrm, ExtCtrls;

type
  TNewChildForm = class(TChildForm)
    Image1: TImage;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  NewChildForm: TNewChildForm;

implementation

{$R *.DFM}

end.

{
Copyright © 1999 by Delphi 5 Developer's Guide - Xavier Pacheco and Steve Teixeira
}

unit ChildFrm;

interface

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

type

  TChildForm = class(TForm)
  private
    FAsChild: Boolean;
    FTempParent: TWinControl;
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    procedure Loaded; override;
  public
    constructor Create(AOwner: TComponent); overload; override;
    constructor Create(AOwner: TComponent; AParent: TWinControl); reintroduce;
      overload;

    // The method below must be overridden to return either the main menu
    // of the form, or nil.
    function GetFormMenu: TMainMenu; virtual; abstract;
    function CanChange: Boolean; virtual;
  end;

var
  ChildForm: TChildForm;

implementation

{$R *.DFM}

constructor TChildForm.Create(AOwner: TComponent);
begin
  FAsChild := False;
  inherited Create(AOwner);
end;

constructor TChildForm.Create(AOwner: TComponent; AParent: TWinControl);
begin
  FAsChild := True;
  FTempParent := aParent;
  inherited Create(AOwner);
end;

procedure TChildForm.Loaded;
begin
  inherited;
  if FAsChild then
  begin
    align := alClient;
    BorderStyle := bsNone;
    BorderIcons := [];
    Parent := FTempParent;
    Position := poDefault;
  end;
end;

procedure TChildForm.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  if FAsChild then
    Params.Style := Params.Style or WS_CHILD;
end;

function TChildForm.CanChange: Boolean;
begin
  Result := True;
end;

end.

{
Copyright © 1999 by Delphi 5 Developer's Guide - Xavier Pacheco and Steve Teixeira
}

unit MainFrm;

interface

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

type
  TMainForm = class(TForm)
    pnlMain: TPanel;
    Splitter1: TSplitter;
    pnlParent: TPanel;
    btnNormal: TButton;
    btnChild: TButton;
    btnFree: TButton;
    procedure btnNormalClick(Sender: TObject);
    procedure btnChildClick(Sender: TObject);
    procedure btnFreeClick(Sender: TObject);
  private
    FNewChildForm: TNewChildForm;
  public
    { Public declarations }
  end;

var
  MainForm: TMainForm;

implementation

{$R *.DFM}

procedure TMainForm.btnNormalClick(Sender: TObject);
var
  LocalChildForm: TNewChildForm;
begin
  LocalChildForm := TNewChildForm.Create(Application);
  try
    LocalChildForm.ShowModal;
  finally
    LocalChildForm.Free;
  end;
end;

procedure TMainForm.btnChildClick(Sender: TObject);
begin
  if not Assigned(FNewChildForm) then
  begin
    FNewChildForm := TNewChildForm.Create(Application, pnlParent);
    FNewChildform.Show;
    pnlParent.Height := pnlParent.Height - 1;
  end;
end;

procedure TMainForm.btnFreeClick(Sender: TObject);
begin
  if Assigned(FNewChildForm) then
  begin
    FNewChildForm.Free;
    FNewChildform := nil;
  end;
end;

end.