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Home: Code Repository: Mastering Delphi 6

Chapter 20 - Project Xform1

Project Structure

Xform1.dpr
library Xform1;

uses
  ComServ,
  XForm1_TLB in 'XForm1_TLB.pas',
  FormX1 in 'FormX1.pas' {FormX1: TActiveForm} {FormX1: CoClass};

{$E ocx}

exports
  DllGetClassObject,
  DllCanUnloadNow,
  DllRegisterServer,
  DllUnregisterServer;

{$R *.TLB}

{$R *.RES}

begin
end.
XForm1_TLB.pas
unit XForm1_TLB;

// ************************************************************************ //
// WARNING                                                                    
// -------                                                                    
// The types declared in this file were generated from data read from a       
// Type Library. If this type library is explicitly or indirectly (via        
// another type library referring to this type library) re-imported, or the   
// 'Refresh' command of the Type Library Editor activated while editing the   
// Type Library, the contents of this file will be regenerated and all        
// manual modifications will be lost.                                         
// ************************************************************************ //

// PASTLWTR : $Revision:   1.130  $
// File generated on 6/21/2001 5:56:56 PM from Type Library described below.

// ************************************************************************  //
// Type Lib: C:\md6code\20\XForm1\Xform1.tlb (1)
// LIBID: {DB9C325A-0D2A-11D2-B9F1-004845400FAA}
// LCID: 0
// Helpfile: 
// DepndLst: 
//   (1) v2.0 stdole, (C:\WINDOWS\System32\stdole2.tlb)
//   (2) v4.0 StdVCL, (C:\WINDOWS\system32\stdvcl40.dll)
// ************************************************************************ //
{$TYPEDADDRESS OFF} // Unit must be compiled without type-checked pointers. 
{$WARN SYMBOL_PLATFORM OFF}
{$WRITEABLECONST ON}

interface

uses ActiveX, Classes, Graphics, OleCtrls, StdVCL, Variants, Windows;



  // *********************************************************************//
// GUIDS declared in the TypeLibrary. Following prefixes are used:        
//   Type Libraries     : LIBID_xxxx                                      
//   CoClasses          : CLASS_xxxx                                      
//   DISPInterfaces     : DIID_xxxx                                       
//   Non-DISP interfaces: IID_xxxx                                        
// *********************************************************************//
const
  // TypeLibrary Major and minor versions
  XForm1MajorVersion = 1;
  XForm1MinorVersion = 0;

  LIBID_XForm1: TGUID = '{DB9C325A-0D2A-11D2-B9F1-004845400FAA}';

  IID_IFormX1: TGUID = '{DB9C325B-0D2A-11D2-B9F1-004845400FAA}';
  DIID_IFormX1Events: TGUID = '{DB9C325D-0D2A-11D2-B9F1-004845400FAA}';
  CLASS_FormX1: TGUID = '{DB9C325F-0D2A-11D2-B9F1-004845400FAA}';

// *********************************************************************//
// Declaration of Enumerations defined in Type Library                    
// *********************************************************************//
// Constants for enum TxActiveFormBorderStyle
type
  TxActiveFormBorderStyle = TOleEnum;
const
  afbNone = $00000000;
  afbSingle = $00000001;
  afbSunken = $00000002;
  afbRaised = $00000003;

// Constants for enum TxPrintScale
type
  TxPrintScale = TOleEnum;
const
  poNone = $00000000;
  poProportional = $00000001;
  poPrintToFit = $00000002;

// Constants for enum TxMouseButton
type
  TxMouseButton = TOleEnum;
const
  mbLeft = $00000000;
  mbRight = $00000001;
  mbMiddle = $00000002;

// Constants for enum TxBiDiMode
type
  TxBiDiMode = TOleEnum;
const
  bdLeftToRight = $00000000;
  bdRightToLeft = $00000001;
  bdRightToLeftNoAlign = $00000002;
  bdRightToLeftReadingOnly = $00000003;

type

// *********************************************************************//
// Forward declaration of types defined in TypeLibrary                    
// *********************************************************************//
  IFormX1 = interface;
  IFormX1Disp = dispinterface;
  IFormX1Events = dispinterface;

// *********************************************************************//
// Declaration of CoClasses defined in Type Library                       
// (NOTE: Here we map each CoClass to its Default Interface)              
// *********************************************************************//
  FormX1 = IFormX1;


// *********************************************************************//
// Interface: IFormX1
// Flags:     (4416) Dual OleAutomation Dispatchable
// GUID:      {DB9C325B-0D2A-11D2-B9F1-004845400FAA}
// *********************************************************************//
  IFormX1 = interface(IDispatch)
    ['{DB9C325B-0D2A-11D2-B9F1-004845400FAA}']
    function  Get_Visible: WordBool; safecall;
    procedure Set_Visible(Value: WordBool); safecall;
    function  Get_AutoScroll: WordBool; safecall;
    procedure Set_AutoScroll(Value: WordBool); safecall;
    function  Get_AutoSize: WordBool; safecall;
    procedure Set_AutoSize(Value: WordBool); safecall;
    function  Get_AxBorderStyle: TxActiveFormBorderStyle; safecall;
    procedure Set_AxBorderStyle(Value: TxActiveFormBorderStyle); safecall;
    function  Get_Caption: WideString; safecall;
    procedure Set_Caption(const Value: WideString); safecall;
    function  Get_Color: OLE_COLOR; safecall;
    procedure Set_Color(Value: OLE_COLOR); safecall;
    function  Get_Font: IFontDisp; safecall;
    procedure Set_Font(const Value: IFontDisp); safecall;
    procedure _Set_Font(const Value: IFontDisp); safecall;
    function  Get_KeyPreview: WordBool; safecall;
    procedure Set_KeyPreview(Value: WordBool); safecall;
    function  Get_PixelsPerInch: Integer; safecall;
    procedure Set_PixelsPerInch(Value: Integer); safecall;
    function  Get_PrintScale: TxPrintScale; safecall;
    procedure Set_PrintScale(Value: TxPrintScale); safecall;
    function  Get_Scaled: WordBool; safecall;
    procedure Set_Scaled(Value: WordBool); safecall;
    function  Get_Active: WordBool; safecall;
    function  Get_DropTarget: WordBool; safecall;
    procedure Set_DropTarget(Value: WordBool); safecall;
    function  Get_HelpFile: WideString; safecall;
    procedure Set_HelpFile(const Value: WideString); safecall;
    function  Get_DoubleBuffered: WordBool; safecall;
    procedure Set_DoubleBuffered(Value: WordBool); safecall;
    function  Get_Enabled: WordBool; safecall;
    procedure Set_Enabled(Value: WordBool); safecall;
    function  Get_BiDiMode: TxBiDiMode; safecall;
    procedure Set_BiDiMode(Value: TxBiDiMode); safecall;
    function  Get_Cursor: Smallint; safecall;
    procedure Set_Cursor(Value: Smallint); safecall;
    property Visible: WordBool read Get_Visible write Set_Visible;
    property AutoScroll: WordBool read Get_AutoScroll write Set_AutoScroll;
    property AutoSize: WordBool read Get_AutoSize write Set_AutoSize;
    property AxBorderStyle: TxActiveFormBorderStyle read Get_AxBorderStyle write Set_AxBorderStyle;
    property Caption: WideString read Get_Caption write Set_Caption;
    property Color: OLE_COLOR read Get_Color write Set_Color;
    property Font: IFontDisp read Get_Font write Set_Font;
    property KeyPreview: WordBool read Get_KeyPreview write Set_KeyPreview;
    property PixelsPerInch: Integer read Get_PixelsPerInch write Set_PixelsPerInch;
    property PrintScale: TxPrintScale read Get_PrintScale write Set_PrintScale;
    property Scaled: WordBool read Get_Scaled write Set_Scaled;
    property Active: WordBool read Get_Active;
    property DropTarget: WordBool read Get_DropTarget write Set_DropTarget;
    property HelpFile: WideString read Get_HelpFile write Set_HelpFile;
    property DoubleBuffered: WordBool read Get_DoubleBuffered write Set_DoubleBuffered;
    property Enabled: WordBool read Get_Enabled write Set_Enabled;
    property BiDiMode: TxBiDiMode read Get_BiDiMode write Set_BiDiMode;
    property Cursor: Smallint read Get_Cursor write Set_Cursor;
  end;

// *********************************************************************//
// DispIntf:  IFormX1Disp
// Flags:     (4416) Dual OleAutomation Dispatchable
// GUID:      {DB9C325B-0D2A-11D2-B9F1-004845400FAA}
// *********************************************************************//
  IFormX1Disp = dispinterface
    ['{DB9C325B-0D2A-11D2-B9F1-004845400FAA}']
    property Visible: WordBool dispid 1;
    property AutoScroll: WordBool dispid 2;
    property AutoSize: WordBool dispid 3;
    property AxBorderStyle: TxActiveFormBorderStyle dispid 4;
    property Caption: WideString dispid -518;
    property Color: OLE_COLOR dispid -501;
    property Font: IFontDisp dispid -512;
    property KeyPreview: WordBool dispid 5;
    property PixelsPerInch: Integer dispid 6;
    property PrintScale: TxPrintScale dispid 7;
    property Scaled: WordBool dispid 8;
    property Active: WordBool readonly dispid 9;
    property DropTarget: WordBool dispid 10;
    property HelpFile: WideString dispid 11;
    property DoubleBuffered: WordBool dispid 12;
    property Enabled: WordBool dispid -514;
    property BiDiMode: TxBiDiMode dispid 13;
    property Cursor: Smallint dispid 14;
  end;

// *********************************************************************//
// DispIntf:  IFormX1Events
// Flags:     (4096) Dispatchable
// GUID:      {DB9C325D-0D2A-11D2-B9F1-004845400FAA}
// *********************************************************************//
  IFormX1Events = dispinterface
    ['{DB9C325D-0D2A-11D2-B9F1-004845400FAA}']
    procedure OnActivate; dispid 1;
    procedure OnClick; dispid 2;
    procedure OnCreate; dispid 3;
    procedure OnDblClick; dispid 4;
    procedure OnDestroy; dispid 5;
    procedure OnDeactivate; dispid 6;
    procedure OnKeyPress(var Key: Smallint); dispid 10;
    procedure OnPaint; dispid 15;
  end;


// *********************************************************************//
// OLE Control Proxy class declaration
// Control Name     : TFormX1
// Help String      : FormX1 Control
// Default Interface: IFormX1
// Def. Intf. DISP? : No
// Event   Interface: IFormX1Events
// TypeFlags        : (34) CanCreate Control
// *********************************************************************//
  TFormX1OnKeyPress = procedure(Sender: TObject; var Key: Smallint) of object;

  TFormX1 = class(TOleControl)
  private
    FOnActivate: TNotifyEvent;
    FOnClick: TNotifyEvent;
    FOnCreate: TNotifyEvent;
    FOnDblClick: TNotifyEvent;
    FOnDestroy: TNotifyEvent;
    FOnDeactivate: TNotifyEvent;
    FOnKeyPress: TFormX1OnKeyPress;
    FOnPaint: TNotifyEvent;
    FIntf: IFormX1;
    function  GetControlInterface: IFormX1;
  protected
    procedure CreateControl;
    procedure InitControlData; override;
  public
    property  ControlInterface: IFormX1 read GetControlInterface;
    property  DefaultInterface: IFormX1 read GetControlInterface;
    property Visible: WordBool index 1 read GetWordBoolProp write SetWordBoolProp;
    property Active: WordBool index 9 read GetWordBoolProp;
    property DropTarget: WordBool index 10 read GetWordBoolProp write SetWordBoolProp;
    property HelpFile: WideString index 11 read GetWideStringProp write SetWideStringProp;
    property DoubleBuffered: WordBool index 12 read GetWordBoolProp write SetWordBoolProp;
    property Enabled: WordBool index -514 read GetWordBoolProp write SetWordBoolProp;
    property BiDiMode: TOleEnum index 13 read GetTOleEnumProp write SetTOleEnumProp;
  published
    property  ParentColor;
    property  ParentFont;
    property  Align;
    property  DragCursor;
    property  DragMode;
    property  ParentShowHint;
    property  PopupMenu;
    property  ShowHint;
    property  TabOrder;
    property  OnDragDrop;
    property  OnDragOver;
    property  OnEndDrag;
    property  OnEnter;
    property  OnExit;
    property  OnStartDrag;
    property AutoScroll: WordBool index 2 read GetWordBoolProp write SetWordBoolProp stored False;
    property AutoSize: WordBool index 3 read GetWordBoolProp write SetWordBoolProp stored False;
    property AxBorderStyle: TOleEnum index 4 read GetTOleEnumProp write SetTOleEnumProp stored False;
    property Caption: WideString index -518 read GetWideStringProp write SetWideStringProp stored False;
    property Color: TColor index -501 read GetTColorProp write SetTColorProp stored False;
    property Font: TFont index -512 read GetTFontProp write _SetTFontProp stored False;
    property KeyPreview: WordBool index 5 read GetWordBoolProp write SetWordBoolProp stored False;
    property PixelsPerInch: Integer index 6 read GetIntegerProp write SetIntegerProp stored False;
    property PrintScale: TOleEnum index 7 read GetTOleEnumProp write SetTOleEnumProp stored False;
    property Scaled: WordBool index 8 read GetWordBoolProp write SetWordBoolProp stored False;
    property Cursor: Smallint index 14 read GetSmallintProp write SetSmallintProp stored False;
    property OnActivate: TNotifyEvent read FOnActivate write FOnActivate;
    property OnClick: TNotifyEvent read FOnClick write FOnClick;
    property OnCreate: TNotifyEvent read FOnCreate write FOnCreate;
    property OnDblClick: TNotifyEvent read FOnDblClick write FOnDblClick;
    property OnDestroy: TNotifyEvent read FOnDestroy write FOnDestroy;
    property OnDeactivate: TNotifyEvent read FOnDeactivate write FOnDeactivate;
    property OnKeyPress: TFormX1OnKeyPress read FOnKeyPress write FOnKeyPress;
    property OnPaint: TNotifyEvent read FOnPaint write FOnPaint;
  end;

procedure Register;

resourcestring
  dtlServerPage = 'Servers';

implementation

uses ComObj;

procedure TFormX1.InitControlData;
const
  CEventDispIDs: array [0..7] of DWORD = (
    $00000001, $00000002, $00000003, $00000004, $00000005, $00000006,
    $0000000A, $0000000F);
  CTFontIDs: array [0..0] of DWORD = (
    $FFFFFE00);
  CControlData: TControlData2 = (
    ClassID: '{DB9C325F-0D2A-11D2-B9F1-004845400FAA}';
    EventIID: '{DB9C325D-0D2A-11D2-B9F1-004845400FAA}';
    EventCount: 8;
    EventDispIDs: @CEventDispIDs;
    LicenseKey: nil (*HR:$00000000*);
    Flags: $0000001D;
    Version: 401;
    FontCount: 1;
    FontIDs: @CTFontIDs);
begin
  ControlData := @CControlData;
  TControlData2(CControlData).FirstEventOfs := Cardinal(@@FOnActivate) - Cardinal(Self);
end;

procedure TFormX1.CreateControl;

  procedure DoCreate;
  begin
    FIntf := IUnknown(OleObject) as IFormX1;
  end;

begin
  if FIntf = nil then DoCreate;
end;

function TFormX1.GetControlInterface: IFormX1;
begin
  CreateControl;
  Result := FIntf;
end;

procedure Register;
begin
  RegisterComponents('ActiveX',[TFormX1]);
end;

end.
FormX1.pas
unit FormX1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ActiveX, AxCtrls, XForm1_TLB, ExtCtrls, StdVcl;

{$WARN SYMBOL_PLATFORM OFF}

type
  TFormX1 = class(TActiveForm, IFormX1)
    PaintBox1: TPaintBox;
    procedure FormPaint(Sender: TObject);
    procedure PaintBox1MouseDown(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
  private
    { Private declarations }
    FEvents: IFormX1Events;
    procedure ActivateEvent(Sender: TObject);
    procedure ClickEvent(Sender: TObject);
    procedure CreateEvent(Sender: TObject);
    procedure DblClickEvent(Sender: TObject);
    procedure DeactivateEvent(Sender: TObject);
    procedure DestroyEvent(Sender: TObject);
    procedure KeyPressEvent(Sender: TObject; var Key: Char);
    procedure PaintEvent(Sender: TObject);
  protected
    { Protected declarations }
    procedure DefinePropertyPages(DefinePropertyPage: TDefinePropertyPage); override;
    procedure EventSinkChanged(const EventSink: IUnknown); override;
    function Get_Active: WordBool; safecall;
    function Get_AutoScroll: WordBool; safecall;
    function Get_AutoSize: WordBool; safecall;
    function Get_AxBorderStyle: TxActiveFormBorderStyle; safecall;
    function Get_BiDiMode: TxBiDiMode; safecall;
    function Get_Caption: WideString; safecall;
    function Get_Color: OLE_COLOR; safecall;
    function Get_Cursor: Smallint; safecall;
    function Get_DoubleBuffered: WordBool; safecall;
    function Get_DropTarget: WordBool; safecall;
    function Get_Enabled: WordBool; safecall;
    function Get_Font: IFontDisp; safecall;
    function Get_HelpFile: WideString; safecall;
    function Get_KeyPreview: WordBool; safecall;
    function Get_PixelsPerInch: Integer; safecall;
    function Get_PrintScale: TxPrintScale; safecall;
    function Get_Scaled: WordBool; safecall;
    function Get_Visible: WordBool; safecall;
    procedure _Set_Font(const Value: IFontDisp); safecall;
    procedure Set_AutoScroll(Value: WordBool); safecall;
    procedure Set_AutoSize(Value: WordBool); safecall;
    procedure Set_AxBorderStyle(Value: TxActiveFormBorderStyle); safecall;
    procedure Set_BiDiMode(Value: TxBiDiMode); safecall;
    procedure Set_Caption(const Value: WideString); safecall;
    procedure Set_Color(Value: OLE_COLOR); safecall;
    procedure Set_Cursor(Value: Smallint); safecall;
    procedure Set_DoubleBuffered(Value: WordBool); safecall;
    procedure Set_DropTarget(Value: WordBool); safecall;
    procedure Set_Enabled(Value: WordBool); safecall;
    procedure Set_Font(const Value: IFontDisp); safecall;
    procedure Set_HelpFile(const Value: WideString); safecall;
    procedure Set_KeyPreview(Value: WordBool); safecall;
    procedure Set_PixelsPerInch(Value: Integer); safecall;
    procedure Set_PrintScale(Value: TxPrintScale); safecall;
    procedure Set_Scaled(Value: WordBool); safecall;
    procedure Set_Visible(Value: WordBool); safecall;
  public
    { Public declarations }
    procedure Initialize; override;
  end;

implementation

uses ComObj, ComServ;

{$R *.DFM}

{ TFormX1 }

procedure TFormX1.DefinePropertyPages(DefinePropertyPage: TDefinePropertyPage);
begin
  { Define property pages here.  Property pages are defined by calling
    DefinePropertyPage with the class id of the page.  For example,
      DefinePropertyPage(Class_FormX1Page); }
end;

procedure TFormX1.EventSinkChanged(const EventSink: IUnknown);
begin
  FEvents := EventSink as IFormX1Events;
end;

procedure TFormX1.Initialize;
begin
  inherited Initialize;
  OnActivate := ActivateEvent;
  OnClick := ClickEvent;
  OnCreate := CreateEvent;
  OnDblClick := DblClickEvent;
  OnDeactivate := DeactivateEvent;
  OnDestroy := DestroyEvent;
  OnKeyPress := KeyPressEvent;
  OnPaint := PaintEvent;
end;

function TFormX1.Get_Active: WordBool;
begin
  Result := Active;
end;

function TFormX1.Get_AutoScroll: WordBool;
begin
  Result := AutoScroll;
end;

function TFormX1.Get_AutoSize: WordBool;
begin
  Result := AutoSize;
end;

function TFormX1.Get_AxBorderStyle: TxActiveFormBorderStyle;
begin
  Result := Ord(AxBorderStyle);
end;

function TFormX1.Get_BiDiMode: TxBiDiMode;
begin
  Result := Ord(BiDiMode);
end;

function TFormX1.Get_Caption: WideString;
begin
  Result := WideString(Caption);
end;

function TFormX1.Get_Color: OLE_COLOR;
begin
  Result := OLE_COLOR(Color);
end;

function TFormX1.Get_Cursor: Smallint;
begin
  Result := Smallint(Cursor);
end;

function TFormX1.Get_DoubleBuffered: WordBool;
begin
  Result := DoubleBuffered;
end;

function TFormX1.Get_DropTarget: WordBool;
begin
  Result := DropTarget;
end;

function TFormX1.Get_Enabled: WordBool;
begin
  Result := Enabled;
end;

function TFormX1.Get_Font: IFontDisp;
begin
  GetOleFont(Font, Result);
end;

function TFormX1.Get_HelpFile: WideString;
begin
  Result := WideString(HelpFile);
end;

function TFormX1.Get_KeyPreview: WordBool;
begin
  Result := KeyPreview;
end;

function TFormX1.Get_PixelsPerInch: Integer;
begin
  Result := PixelsPerInch;
end;

function TFormX1.Get_PrintScale: TxPrintScale;
begin
  Result := Ord(PrintScale);
end;

function TFormX1.Get_Scaled: WordBool;
begin
  Result := Scaled;
end;

function TFormX1.Get_Visible: WordBool;
begin
  Result := Visible;
end;

procedure TFormX1._Set_Font(const Value: IFontDisp);
begin
  SetOleFont(Font, Value);
end;

procedure TFormX1.Set_AutoScroll(Value: WordBool);
begin
  AutoScroll := Value;
end;

procedure TFormX1.Set_AutoSize(Value: WordBool);
begin
  AutoSize := Value;
end;

procedure TFormX1.Set_AxBorderStyle(Value: TxActiveFormBorderStyle);
begin
  AxBorderStyle := TActiveFormBorderStyle(Value);
end;

procedure TFormX1.Set_BiDiMode(Value: TxBiDiMode);
begin
  BiDiMode := TBiDiMode(Value);
end;

procedure TFormX1.Set_Caption(const Value: WideString);
begin
  Caption := TCaption(Value);
end;

procedure TFormX1.Set_Color(Value: OLE_COLOR);
begin
  Color := TColor(Value);
end;

procedure TFormX1.Set_Cursor(Value: Smallint);
begin
  Cursor := TCursor(Value);
end;

procedure TFormX1.Set_DoubleBuffered(Value: WordBool);
begin
  DoubleBuffered := Value;
end;

procedure TFormX1.Set_DropTarget(Value: WordBool);
begin
  DropTarget := Value;
end;

procedure TFormX1.Set_Enabled(Value: WordBool);
begin
  Enabled := Value;
end;

procedure TFormX1.Set_Font(const Value: IFontDisp);
begin
  SetOleFont(Font, Value);
end;

procedure TFormX1.Set_HelpFile(const Value: WideString);
begin
  HelpFile := String(Value);
end;

procedure TFormX1.Set_KeyPreview(Value: WordBool);
begin
  KeyPreview := Value;
end;

procedure TFormX1.Set_PixelsPerInch(Value: Integer);
begin
  PixelsPerInch := Value;
end;

procedure TFormX1.Set_PrintScale(Value: TxPrintScale);
begin
  PrintScale := TPrintScale(Value);
end;

procedure TFormX1.Set_Scaled(Value: WordBool);
begin
  Scaled := Value;
end;

procedure TFormX1.Set_Visible(Value: WordBool);
begin
  Visible := Value;
end;

procedure TFormX1.ActivateEvent(Sender: TObject);
begin
  if FEvents <> nil then FEvents.OnActivate;
end;

procedure TFormX1.ClickEvent(Sender: TObject);
begin
  if FEvents <> nil then FEvents.OnClick;
end;

procedure TFormX1.CreateEvent(Sender: TObject);
begin
  if FEvents <> nil then FEvents.OnCreate;
end;

procedure TFormX1.DblClickEvent(Sender: TObject);
begin
  if FEvents <> nil then FEvents.OnDblClick;
end;

procedure TFormX1.DeactivateEvent(Sender: TObject);
begin
  if FEvents <> nil then FEvents.OnDeactivate;
end;

procedure TFormX1.DestroyEvent(Sender: TObject);
begin
  if FEvents <> nil then FEvents.OnDestroy;
end;

procedure TFormX1.KeyPressEvent(Sender: TObject; var Key: Char);
var
  TempKey: Smallint;
begin
  TempKey := Smallint(Key);
  if FEvents <> nil then FEvents.OnKeyPress(TempKey);
  Key := Char(TempKey);
end;

procedure TFormX1.PaintEvent(Sender: TObject);
begin
  Canvas.Brush.Color := clBlue;
  Canvas.Rectangle (20, 20,
    ClientWidth - 20, ClientHeight - 20);
  if FEvents <> nil then FEvents.OnPaint;
end;

procedure TFormX1.FormPaint(Sender: TObject);
begin
  Canvas.Brush.Color := clYellow;
  Canvas.Ellipse(0, 0, Width, Height);
end;

procedure TFormX1.PaintBox1MouseDown(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
begin
  PaintBox1.Canvas.Ellipse (X-10, Y-10, X+10, Y+10);
end;

initialization
  TActiveFormFactory.Create(
    ComServer,
    TActiveFormControl,
    TFormX1,
    Class_FormX1,
    1,
    '',
    OLEMISC_SIMPLEFRAME or OLEMISC_ACTSLIKELABEL,
    tmApartment);
end.
FormX1.dfm
object FormX1: TFormX1
  Left = 192
  Top = 108
  Width = 413
  Height = 278
  Caption = 'FormX1'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  OnPaint = FormPaint
  PixelsPerInch = 96
  TextHeight = 13
  object PaintBox1: TPaintBox
    Left = 56
    Top = 56
    Width = 289
    Height = 129
    HelpType = htKeyword
    Color = clFuchsia
    ParentColor = False
    OnMouseDown = PaintBox1MouseDown
  end
end