lazarus-ccr/components/orpheus/ovcbase.pas

{*********************************************************}
{*                    OVCBASE.PAS 4.06                   *}
{*********************************************************}

{* ***** BEGIN LICENSE BLOCK *****                                            *}
{* Version: MPL 1.1                                                           *}
{*                                                                            *}
{* The contents of this file are subject to the Mozilla Public License        *}
{* Version 1.1 (the "License"); you may not use this file except in           *}
{* compliance with the License. You may obtain a copy of the License at       *}
{* http://www.mozilla.org/MPL/                                                *}
{*                                                                            *}
{* Software distributed under the License is distributed on an "AS IS" basis, *}
{* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License   *}
{* for the specific language governing rights and limitations under the       *}
{* License.                                                                   *}
{*                                                                            *}
{* The Original Code is TurboPower Orpheus                                    *}
{*                                                                            *}
{* The Initial Developer of the Original Code is TurboPower Software          *}
{*                                                                            *}
{* Portions created by TurboPower Software Inc. are Copyright (C)1995-2002    *}
{* TurboPower Software Inc. All Rights Reserved.                              *}
{*                                                                            *}
{* Contributor(s):                                                            *}
{*                                                                            *}
{* ***** END LICENSE BLOCK *****                                              *}

{$I OVC.INC}

{$B-} {Complete Boolean Evaluation}
{$I+} {Input/Output-Checking}
{$P+} {Open Parameters}
{$T-} {Typed @ Operator}
{.$W-} {Windows Stack Frame}
{$X+} {Extended Syntax}

{$IFNDEF VERSION3}
!! Error - not for Delphi versions 1 and 2 or C++ Builder version 1
{$ENDIF}

{$IFNDEF LCL}
{$R OVCBASE.RES}
{$ENDIF}

unit ovcbase;
  {-Base unit for Orpheus visual components}

interface

uses
  {$IFNDEF LCL} Windows, Messages, {$ELSE} LclIntf, LMessages, LclType, LResources, MyMisc, {$ENDIF} 
  Classes, Controls, Dialogs, Forms, StdCtrls, SysUtils,
  OvcCmd, OvcData, OvcMisc, OvcConst, OvcExcpt, {$IFNDEF LCL} OvcTimer, {$ENDIF} OvcDate;

type
  TOvcLabelPosition = (lpTopLeft, lpBottomLeft); {attached label types}

  TOvcAttachEvent = procedure(Sender : TObject; Value : Boolean)
    of object;

  TOvcAttachedLabel = class(TLabel)
  protected {private}
    FControl : TWinControl;

  protected
    procedure SavePosition;
    procedure Loaded;
      override;

  public
    constructor Create(AOwner : TComponent);
      override;
    constructor CreateEx(AOwner : TComponent; AControl : TWinControl);
      virtual;
    procedure SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
      override;

  published
    property Control : TWinControl
      read FControl write FControl;
  end;

  TO32ContainerList = class(TList)
    FOwner: TComponent;
  public
    constructor Create(AOwner: TComponent); virtual;
    destructor Destroy; override;
  end;

  TOvcLabelInfo = class(TPersistent)
  protected {private}
    {property variables}
    FOffsetX  : Integer;
    FOffsetY  : Integer;

    {event variables}
    FOnChange : TNotifyEvent;
    FOnAttach : TOvcAttachEvent;

    {internal methods}
    procedure DoOnAttach;
    procedure DoOnChange;
    function IsVisible : Boolean;

    {property methods}
    procedure SetOffsetX(Value : Integer);
    procedure SetOffsetY(Value : Integer);
    procedure SetVisible(Value : Boolean);

  public
    ALabel   : TOvcAttachedLabel;
    FVisible : Boolean;

    property OnAttach : TOvcAttachEvent
      read FOnAttach write FOnAttach;
    property OnChange : TNotifyEvent
      read FOnChange write FOnChange;

    procedure SetOffsets(X, Y : Integer);

  published
    property OffsetX: Integer
      read FOffsetX write SetOffsetX stored IsVisible;
    property OffsetY: Integer
      read FOffsetY write SetOffsetY stored IsVisible;
    property Visible : Boolean
      read FVisible write SetVisible
      default False;
  end;

  {event method types}
  TMouseWheelEvent = procedure(Sender : TObject; Shift : TShiftState;
                                Delta, XPos, YPos : Word) of object;

  TDataErrorEvent =
    procedure(Sender : TObject; ErrorCode : Word; const ErrorMsg : string)
    of object;
  TPostEditEvent =
    procedure(Sender : TObject; GainingControl : TWinControl)
    of object;
  TPreEditEvent =
    procedure(Sender : TObject; LosingControl : TWinControl)
    of object;
  TDelayNotifyEvent =
    procedure(Sender : TObject; NotifyCode : Word)
    of object;
  TIsSpecialControlEvent =
    procedure(Sender : TObject; Control : TWinControl;
    var Special : Boolean)
    of object;
  TGetEpochEvent =
    procedure (Sender : TObject; var Epoch : Integer)
    of object;

  {options which will be the same for all fields attached to the same controller}
  TOvcBaseEFOption = (
    efoAutoAdvanceChar,
    efoAutoAdvanceLeftRight,
    efoAutoAdvanceUpDown,
    efoAutoSelect,
    efoBeepOnError,
    efoInsertPushes);
  TOvcBaseEFOptions = set of TOvcBaseEFOption;

type
  TOvcCollectionStreamer = class;
  TOvcCollection = class;
  TO32Collection = class;

  {implements the About property and collection streaming}
  TOvcComponent = class(TComponent)
  protected {private}
    FCollectionStreamer : TOvcCollectionStreamer;
    FInternal : Boolean; {flag to suppress name generation
                          on collection items}
    function GetAbout : string;
    procedure SetAbout(const Value : string);

  protected
    {OrCollection streaming hooks:}
    procedure GetChildren(Proc: TGetChildProc; Root : TComponent); override;
    function GetChildOwner: TComponent; override;
    procedure Loaded; override;

  public
    constructor Create(AOwner: TComponent);
      override;
    destructor Destroy;
      override;

    property CollectionStreamer : TOvcCollectionStreamer
      read FCollectionStreamer
      write FCollectionStreamer;
    property Internal : Boolean read FInternal write FInternal;
  published
    {properties}
    property About : string
      read GetAbout
      write SetAbout
      stored False;
  end;

  {implements the About property}
  TO32Component = class(TComponent)
  protected {private}
    FInternal : Boolean; {flag to suppress name generation
                          on collection items}
    function GetAbout : string;
    procedure SetAbout(const Value : string);
  public
    constructor Create(AOwner: TComponent); override;
    property Internal : Boolean read FInternal write FInternal;
  published
    {properties}
    property About : string read GetAbout write SetAbout stored False;
  end;

  TOvcController = class(TOvcComponent)
  protected {private}
    FBaseEFOptions : TOvcBaseEFOptions;     {options common to all entry fields}
    FEntryCommands : TOvcCommandProcessor;   {command processor}
    FEpoch         : Integer;                {combined epoch year and century}
    FErrorPending  : Boolean;                {an error is pending for an ef}
    FErrorText     : string;                 {text of last error}

{ - HWnd changed to TOvcHWnd for BCB Compatibility }
    FHandle        : TOvcHWnd{hWnd};         {our window handle}

    FInsertMode    : Boolean;                {global insert mode flag}
{$IFNDEF LCL}  //Currently not implemented
    FTimerPool     : TOvcTimerPool;          {general timer pool}
{$ENDIF}

    {events}
    FOnDelayNotify      : TDelayNotifyEvent;
    FOnError            : TDataErrorEvent;
    FOnGetEpoch         : TGetEpochEvent;
    FOnIsSpecialControl : TIsSpecialControlEvent;
    FOnPostEdit         : TPostEditEvent;
    FOnPreEdit          : TPreEditEvent;
{$IFNDEF LCL}
    FOnTimerTrigger     : TTriggerEvent;
{$ENDIF}

    {property methods}
    function GetEpoch : Integer;

{ - HWnd changed to TOvcHWnd for BCB Compatibility }
    function GetHandle : TOvcHWnd{hWnd};
    procedure SetEpoch(Value : Integer);

    {internal methods}
    procedure cWndProc(var Msg : TMessage);
      {-window procedure}

  public
    constructor Create(AOwner: TComponent);
      override;
    destructor Destroy;
      override;

    procedure DestroyHandle;

{$IFDEF LCL}
    function PostMessage(hWnd: HWND; Msg: UINT; wParam: WPARAM; lParam: LPARAM): BOOL;
{$ENDIF}
    {wrappers for event handlers}
    procedure DoOnPostEdit(Sender : TObject; GainingControl : TWinControl);
      {-call the method assigned to the OnPostEdit event}
    procedure DoOnPreEdit(Sender : TObject; LosingControl : TWinControl);
      {-call the method assigned to the OnPreEdit event}
    procedure DoOnTimerTrigger(Sender : TObject; Handle : Integer;
                               Interval : Cardinal; ElapsedTime : LongInt);

    procedure DelayNotify(Sender : TObject; NotifyCode : Word);
      {-start the chain of events that will fire the OnDelayNotify event}
    procedure DoOnError(Sender : TObject; ErrorCode : Word; const ErrorMsg : string);
      {-call the method assigned to the OnError event}

{ - HWnd changed to TOvcHWnd for BCB Compatibility }
    function IsSpecialButton(H : TOvcHWnd{hWnd}) : Boolean;
      dynamic;
      {-return true if H is btnCancel, btnHelp, or btnRestore}
    procedure MarkAsUninitialized(Uninitialized : Boolean);
      {-mark all entry fields on form as uninitialized}
    function ValidateEntryFields : TComponent;
      {-ask each entry field to validate its contents. Return nil
        if no error, else return pointer to field with error}
    function ValidateEntryFieldsEx(ReportError, ChangeFocus : Boolean) : TComponent;
      {-ask each entry field to validate its contents. Return nil
        if no error, else return pointer to field with error.
        Conditionally move focus and report error}
    function ValidateTheseEntryFields(const Fields : array of TComponent) : TComponent;
      {-ask the specified entry fields to validate their contents. Return nil
        if no error, else return pointer to field with error}

    property ErrorPending : Boolean
      read FErrorPending write FErrorPending;
    property ErrorText : string
      read FErrorText write FErrorText;

{ - HWnd changed to TOvcHWnd for BCB Compatibility }
    property Handle : TOvcHWnd{hWnd}
      read GetHandle;
    property InsertMode : Boolean
      read FInsertMode write FInsertMode;
{$IFNDEF LCL}
    property TimerPool : TOvcTimerPool
      read FTimerPool;
{$ENDIF}

  published
    {properties}
    property EntryCommands : TOvcCommandProcessor
      read FEntryCommands write FEntryCommands stored True;
    property EntryOptions : TOvcBaseEFOptions
      read FBaseEFOptions write FBaseEFOptions
      default [efoAutoSelect, efoBeepOnError, efoInsertPushes];
    property Epoch : Integer
      read GetEpoch write SetEpoch;

    {events}
    property OnError : TDataErrorEvent
      read FOnError write FOnError;
    property OnGetEpoch : TGetEpochEvent
      read FOnGetEpoch write FOnGetEpoch;
    property OnDelayNotify : TDelayNotifyEvent
      read FOnDelayNotify write FOnDelayNotify;
    property OnIsSpecialControl : TIsSpecialControlEvent
      read FOnIsSpecialControl write FOnIsSpecialControl;
    property OnPostEdit : TPostEditEvent
      read FOnPostEdit write FOnPostEdit;
    property OnPreEdit : TPreEditEvent
      read FOnPreEdit write FOnPreEdit;
{$IFNDEF LCL}
    property OnTimerTrigger : TTriggerEvent
      read FOnTimerTrigger write FOnTimerTrigger;
{$ENDIF}
  end;

  TOvcGraphicControl = class(TGraphicControl)
  protected {private}
    FCollectionStreamer : TOvcCollectionStreamer;
    {property methods}
    function GetAbout : string;
    procedure SetAbout(const Value : string);
  protected
    {Collection streaming hooks:}
    procedure GetChildren(Proc: TGetChildProc; Root : TComponent); override;
    function GetChildOwner: TComponent; override;
    procedure Loaded; override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    property CollectionStreamer : TOvcCollectionStreamer
      read FCollectionStreamer write FCollectionStreamer;
  published
    property About : string
      read GetAbout write SetAbout stored False;
  end;

  {Replacement for the TOvcCustomControl except with standard VCL streaming}
  TO32CustomControl = class(TCustomControl)
  protected {private}
    {property variables}
    FAfterEnter         : TNotifyEvent;
    FAfterExit          : TNotifyEvent;
    FOnMouseWheel       : TMouseWheelEvent;
    FLabelInfo          : TOvcLabelInfo;
    FInternal : Boolean; {flag to suppress name generation
                          on collection items}

    {property methods}
    function GetAttachedLabel : TOvcAttachedLabel;
    function GetAbout : string;
    procedure SetAbout(const Value : string);

    {internal methods}
    procedure LabelAttach(Sender : TObject; Value : Boolean);
    procedure LabelChange(Sender : TObject);
    procedure PositionLabel;

    {private message methods}
    procedure OMAssignLabel(var Msg : TMessage);
      message OM_ASSIGNLABEL;
    procedure OMPositionLabel(var Msg : TMessage);
      message OM_POSITIONLABEL;
    procedure OMRecordLabelPosition(var Msg : TMessage);
      message OM_RECORDLABELPOSITION;
    procedure OMAfterEnter(var Msg : TMessage);
      message OM_AFTERENTER;
    procedure OMAfterExit(var Msg : TMessage);
      message OM_AFTEREXIT;

    {VCL message methods}
    procedure CMVisibleChanged(var Msg : TMessage);
      message CM_VISIBLECHANGED;

    {windows message methods}
    procedure WMKillFocus(var Msg : TWMKillFocus);
      message WM_KILLFOCUS;
    procedure WMMouseWheel(var Msg : TMessage);
      message WM_MOUSEWHEEL;
    procedure WMSetFocus(var Msg : TWMSetFocus);
      message WM_SETFOCUS;

  protected
    DefaultLabelPosition : TOvcLabelPosition;

    procedure DoOnMouseWheel(Shift : TShiftState;
                             Delta, XPos, YPos : SmallInt);
      dynamic;
    procedure CreateWnd;
      override;
    procedure Notification(AComponent : TComponent; Operation : TOperation);
      override;

    property AfterEnter : TNotifyEvent
      read FAfterEnter write FAfterEnter;
    property AfterExit : TNotifyEvent
      read FAfterExit write FAfterExit;
    property OnMouseWheel : TMouseWheelEvent
      read FOnMouseWheel write FOnMouseWheel;
    property LabelInfo : TOvcLabelInfo
      read FLabelInfo write FLabelInfo;

  public
    property Internal : Boolean read FInternal write FInternal;
    constructor Create(AOwner : TComponent);
      override;
    destructor Destroy;
      override;
    procedure SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
      override;
    property AttachedLabel : TOvcAttachedLabel
      read GetAttachedLabel;

  published
    property About : string
      read GetAbout write SetAbout stored False;
  end;
  {End - TO32CustomControl}


  TOvcCustomControl = class(TCustomControl)
  protected {private}
    {property variables}
    FAfterEnter         : TNotifyEvent;
    FAfterExit          : TNotifyEvent;
    FCollectionStreamer : TOvcCollectionStreamer;
    FOnMouseWheel       : TMouseWheelEvent;
    FLabelInfo          : TOvcLabelInfo;
    FInternal : Boolean; {flag to suppress name generation
                          on collection items}

    {property methods}
    function GetAttachedLabel : TOvcAttachedLabel;
    function GetAbout : string;
    procedure SetAbout(const Value : string);

    {internal methods}
    procedure LabelAttach(Sender : TObject; Value : Boolean);
    procedure LabelChange(Sender : TObject);
    procedure PositionLabel;

    {private message methods}
    procedure OMAssignLabel(var Msg : TMessage);
      message OM_ASSIGNLABEL;
    procedure OMPositionLabel(var Msg : TMessage);
      message OM_POSITIONLABEL;
    procedure OMRecordLabelPosition(var Msg : TMessage);
      message OM_RECORDLABELPOSITION;
    procedure OMAfterEnter(var Msg : TMessage);
      message OM_AFTERENTER;
    procedure OMAfterExit(var Msg : TMessage);
      message OM_AFTEREXIT;

    {VCL message methods}
    procedure CMVisibleChanged(var Msg : TMessage);
      message CM_VISIBLECHANGED;

    {windows message methods}
    procedure WMKillFocus(var Msg : TWMKillFocus);
      message WM_KILLFOCUS;
    procedure WMMouseWheel(var Msg : TMessage);
      message WM_MOUSEWHEEL;
    procedure WMSetFocus(var Msg : TWMSetFocus);
      message WM_SETFOCUS;

  protected
    {descendants can set the value of this variable after calling inherited }
    {create to set the default location and point-of-reference (POR) for the}
    {attached label. if dlpTopLeft, the default location and POR will be at }
    {the top left of the control. if dlpBottomLeft, the default location and}
    {POR will be at the bottom left}
    DefaultLabelPosition : TOvcLabelPosition;

    procedure DoOnMouseWheel(Shift : TShiftState;
                             Delta, XPos, YPos : SmallInt);
      dynamic;
    procedure CreateWnd;
      override;
    procedure Notification(AComponent : TComponent; Operation : TOperation);
      override;

    {Collection streaming hooks:}
    procedure GetChildren(Proc: TGetChildProc; Root : TComponent); override;
    function GetChildOwner: TComponent; override;
    procedure Loaded; override;

    property AfterEnter : TNotifyEvent
      read FAfterEnter write FAfterEnter;
    property AfterExit : TNotifyEvent
      read FAfterExit write FAfterExit;
    property OnMouseWheel : TMouseWheelEvent
      read FOnMouseWheel write FOnMouseWheel;
    property LabelInfo : TOvcLabelInfo
      read FLabelInfo write FLabelInfo;

  public
    property Internal : Boolean read FInternal write FInternal;
    constructor Create(AOwner : TComponent);
      override;
    destructor Destroy;
      override;
    procedure SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
      override;
    property AttachedLabel : TOvcAttachedLabel
      read GetAttachedLabel;
    property CollectionStreamer : TOvcCollectionStreamer
      read FCollectionStreamer write FCollectionStreamer;

  published
    property About : string
      read GetAbout write SetAbout stored False;
  end;

  TOvcCollectible = class(TOvcComponent)
  protected {private}
    FCollection : TOvcCollection;
    InChanged : Boolean;

    function GetIndex : Integer;
    procedure SetCollection(Value : TOvcCollection);
    procedure SetIndex(Value : Integer); virtual;

  protected
    procedure Changed; dynamic;
    function GenerateName : string;
      dynamic;
    function GetBaseName : string;
      dynamic;
    function GetDisplayText : string;
      virtual;
    procedure SetName(const NewName : TComponentName);
      override;

  public
    constructor Create(AOwner : TComponent);
      override;
    destructor Destroy;
      override;
    property Collection : TOvcCollection
      read FCollection;
    property DisplayText : string
      read GetDisplayText;
    property Index : Integer
      read GetIndex
      write SetIndex;

    property Name;
  end;

  TO32CollectionItem = class(TCollectionItem)
  protected {private}
    FName: String;
    FDisplayText: String;
    function GetAbout: String;
    procedure SetAbout(const Value: String);
    procedure SetName(Value: String); virtual;
  public
    property DisplayText : string read FDisplayText write FDisplayText;
    property Name: String read FName write SetName;
  published
    property About : String read GetAbout write SetAbout;
  end;


  TOvcCollectibleControl = class(TOvcCustomControl)
  protected {private}
    FCollection : TOvcCollection;
    FInternal : Boolean; {flag to suppress name generation
                          on collection items}
    InChanged : Boolean;

    function GetIndex : Integer;
    procedure SetCollection(Value : TOvcCollection);
    procedure SetIndex(Value : Integer);

  protected
    procedure Changed; dynamic;
    function GenerateName : string;
      dynamic;
    function GetBaseName : string;
      dynamic;
    function GetDisplayText : string;
      virtual;
    procedure SetName(const NewName : TComponentName);
      override;

  public
    constructor Create(AOwner : TComponent);
      override;
    destructor Destroy;
      override;

    property Internal : Boolean read FInternal write FInternal;

    property Collection : TOvcCollection
      read FCollection;

    property DisplayText : string
      read GetDisplayText;

    property Index : Integer
      read GetIndex
      write SetIndex;

    property Name;
  end;

  TOvcCollectibleClass = class of TComponent;
  TO32CollectibleClass = class of TPersistent;

  TOvcItemSelectedEvent =
    procedure(Sender : TObject; Index : Integer) of object;
  TOvcGetEditorCaption =
    procedure(var Caption : string) of object;
  TO32GetEditorCaption =
    procedure(var Caption : string) of object;

  TOvcCollection = class(TPersistent)
  protected {private}
    {property variables}
    FItemClass      : TOvcCollectibleClass;
    FItemEditor     : TForm;
    FItems          : TList;
    FOwner          : TComponent;
    FReadOnly       : Boolean;
    FStored         : Boolean;
    FStreamer       : TOvcCollectionStreamer;

    {event variables}
    FOnChanged      : TNotifyEvent;
    FOnItemSelected : TOvcItemSelectedEvent;
    FOnGetEditorCaption : TOvcGetEditorCaption;

    {Internal variables}
    InLoaded        : Boolean;
    IsLoaded        : Boolean;
    InChanged       : Boolean;

  protected
    function GetCount : Integer;
    function GetItem(Index: Integer): TComponent;
    procedure SetItem(Index: Integer; Value: TComponent);

    procedure Changed;
      virtual;
    procedure Loaded;

  public
    constructor Create(AOwner : TComponent; ItemClass : TOvcCollectibleClass);
    destructor Destroy;
      override;
    property ItemEditor : TForm
      read FItemEditor write FItemEditor;

    function Add : TComponent;
    procedure Clear; virtual;
    procedure Delete(Index : Integer);
    procedure DoOnItemSelected(Index : Integer);
    function GetEditorCaption : string;
    function ItemByName(const Name : string) : TComponent;
    function Insert(Index : Integer) : TComponent;
    function ParentForm : TForm;

    property Count: Integer
                   read GetCount;
    property ItemClass : TOvcCollectibleClass
                   read FItemClass;
    property Item[Index: Integer] : TComponent
                   read GetItem write SetItem; default;
    property OnGetEditorCaption : TOvcGetEditorCaption
      read FOnGetEditorCaption write FOnGetEditorCaption;
    property Owner : TComponent
                   read FOwner;
    property ReadOnly : Boolean
                   read FReadOnly write FReadOnly default False;
    property Stored : Boolean
                   read FStored write FStored default True;
    property OnChanged : TNotifyEvent
                   read FOnChanged write FOnChanged;
    property OnItemSelected : TOvcItemSelectedEvent
                   read FOnItemSelected write FOnItemSelected;
  end;

  TO32Collection = class(TCollection)
  protected {private}
    {property variables}
    FItemEditor     : TForm;
    FReadOnly       : Boolean;

    FOwner: TPersistent;

    {event variables}
    FOnChanged      : TNotifyEvent;
    FOnItemSelected : TOvcItemSelectedEvent;
    FOnGetEditorCaption : TO32GetEditorCaption;

    {Internal variables}
    InLoaded        : Boolean;
    IsLoaded        : Boolean;
    InChanged       : Boolean;

  protected
    function GetCount : Integer;
    procedure Loaded;
  public
    constructor Create(AOwner : TPersistent;
      ItemClass : TCollectionItemClass); virtual;
    destructor Destroy; override;
    property ItemEditor : TForm read FItemEditor write FItemEditor;

    function Add : TO32CollectionItem; dynamic;

    {$IFNDEF VERSION4}
    function Insert(Index: Integer): TO32CollectionItem; dynamic;
    {$ENDIF}

    function GetItem(Index: Integer): TO32CollectionItem;
    function GetOwner: TPersistent; override;
    procedure SetItem(Index: Integer; Value: TO32CollectionItem);
    procedure DoOnItemSelected(Index : Integer);
    function GetEditorCaption : string;
    function ItemByName(const Name : string) : TO32CollectionItem;
    function ParentForm : TForm;

    property Count: Integer
                   read GetCount;
    property Item[Index: Integer] : TO32CollectionItem
                   read GetItem write SetItem; default;
    property OnGetEditorCaption : TO32GetEditorCaption
      read FOnGetEditorCaption write FOnGetEditorCaption;
    property ReadOnly : Boolean
                   read FReadOnly write FReadOnly default False;
    property OnChanged : TNotifyEvent
                   read FOnChanged write FOnChanged;
    property OnItemSelected : TOvcItemSelectedEvent
                   read FOnItemSelected write FOnItemSelected;
  end;

  TOvcCollectionStreamer = class
  protected {private}
    FCollectionList : TList;
    FOwner          : TComponent;

  protected
    procedure Loaded;
    procedure GetChildren(Proc: TGetChildProc; Root : TComponent);

  public
    constructor Create(AOwner : TComponent);
    destructor Destroy;
      override;

    procedure Clear;
    function CollectionFromType(Component : TComponent) : TOvcCollection;

    property Owner : TComponent
      read FOwner;
  end;


type
  {base class for Orpheus components. Provides controller access}
  TOvcCustomControlEx = class(TOvcCustomControl)
  protected {private}
    FController : TOvcController;

    function ControllerAssigned : Boolean;
    function GetController: TOvcController;
    procedure SetController(Value : TOvcController); virtual;

  protected
    procedure CreateWnd;
      override;
    procedure Notification(AComponent : TComponent; Operation : TOperation);
      override;

  public
    property Controller : TOvcController
      read GetController
      write SetController;
  end;


function FindController(Form : TWinControl) : TOvcController;
  {-search for an existing controller component}
function GetImmediateParentForm(Control : TControl) : TWinControl;
  {-return first form found while searching Parent}
procedure ResolveController(AForm : TWinControl; var AController : TOvcController);
  {-find or create a controller on this form}

function DefaultController : TOvcController;

implementation

{.$DEFINE Logging}
uses
  OvcVer,
  TypInfo,
  ExtCtrls,
{$IFNDEF LCL}
  Consts,
{$ELSE}
  LclStrConsts,
{$ENDIF}
  OvcEF
  {$IFDEF Logging}
  ,LogAPI
  {$ENDIF}
  ;

type
  TLocalEF = class(TOvcBaseEntryField);
var
  FDefaultController : TOvcController = nil;

{===== TO32ContainerList =============================================}

constructor TO32ContainerList.Create(AOwner: TComponent);
begin
  inherited Create;
  FOwner := TComponent(AOwner);
end;
{=====}

destructor TO32ContainerList.Destroy;
var
  I: Integer;
begin
  for I := 0 to Count - 1 do
    TPanel(Items[I]).Free;
  inherited;
end;


{*** TOvcLabelInfo ***}

procedure TOvcLabelInfo.DoOnAttach;
begin
  if Assigned(FOnAttach) then
    FOnAttach(Self, FVisible);
end;

procedure TOvcLabelInfo.DoOnChange;
begin
  if Assigned(FOnChange) then
    FOnChange(Self);
end;

function TOvcLabelInfo.IsVisible : Boolean;
begin
  Result := FVisible;
end;

procedure TOvcLabelInfo.SetOffsets(X, Y : Integer);
begin
  if (X <> FOffsetX) or (Y <> FOffsetY) then begin
    FOffsetX := X;
    FOffsetY := Y;
    DoOnChange;
  end;
end;

procedure TOvcLabelInfo.SetOffsetX(Value : Integer);
begin
  if Value <> FOffsetX then begin
    FOffsetX := Value;
    DoOnChange;
  end;
end;

procedure TOvcLabelInfo.SetOffsetY(Value : Integer);
begin
  if Value <> FOffsetY then begin
    FOffsetY := Value;
    DoOnChange;
  end;
end;

procedure TOvcLabelInfo.SetVisible(Value : Boolean);
begin
  if Value <> FVisible then begin
    FVisible := Value;
    DoOnAttach;
  end;
end;


{*** TOvcAttachedLabel ***}

constructor TOvcAttachedLabel.Create(AOwner : TComponent);
begin
  inherited Create(AOwner);

  {set new defaults}
  AutoSize    := True;
  ParentFont  := True;
  Transparent := False;
end;

constructor TOvcAttachedLabel.CreateEx(AOwner : TComponent; AControl : TWinControl);
begin
  FControl := AControl;

  Create(AOwner);

  {set attached control property}
  FocusControl := FControl;
end;

procedure TOvcAttachedLabel.Loaded;
begin
  inherited Loaded;

  SavePosition;
end;

procedure TOvcAttachedLabel.SavePosition;
var
  PF : TWinControl;
  I  : Integer;
begin
  if (csLoading in ComponentState) or (csDestroying in ComponentState) then
    Exit;

  {see if our associated control is on the form - save position}
  PF := GetImmediateParentForm(Self);
  if Assigned(PF) then begin
    for I := 0 to Pred(PF.ComponentCount) do begin
      if PF.Components[I] = FControl then begin
        SendMessage(FControl.Handle, OM_ASSIGNLABEL, 0, LPARAM(Self));  //64
        PostMessage(FControl.Handle, OM_RECORDLABELPOSITION, 0, 0);
        Break;
      end;
    end;
  end;
end;

procedure TOvcAttachedLabel.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
begin
  inherited SetBounds(ALeft, ATop, AWidth, AHeight);
  SavePosition;

  { The following line causes the IDE to mark the form dirty, requiring it }
  { to be saved.  Not sure what this was supposed to do, but commenting it }
  { out seems to solve the problem. }
  {Application.ProcessMessages;}
end;

function FindController(Form : TWinControl) : TOvcController;
  {-search for an existing controller component}
var
  I : Integer;
begin
  Result := nil;
  for I := 0 to Form.ComponentCount-1 do begin
    if Form.Components[I] is TOvcController then begin
      Result := TOvcController(Form.Components[I]);
      Break;
    end;
  end;
end;

function GetImmediateParentForm(Control : TControl) : TWinControl;
  {return first form found while searching Parent}
var
  ParentCtrl : TControl;
begin
  ParentCtrl := Control.Parent;
{$IFDEF VERSION5}
  while Assigned(ParentCtrl) and
    not ((ParentCtrl is TCustomForm) or
         (ParentCtrl is TCustomFrame)) do
{$ELSE}
  while Assigned(ParentCtrl) and (not (ParentCtrl is TCustomForm)) do
{$ENDIF}
    ParentCtrl := ParentCtrl.Parent;
  Result := TWinControl(ParentCtrl);
end;

procedure ResolveController(AForm : TWinControl; var AController : TOvcController);
  {-find or create a controller on this form}
begin
  if not Assigned(AController) then begin
    {search for an existing controller. If not found,}
    {create the controller as a child of the form}
    {and assign it as our controller}
    AController := FindController(AForm);
    (*
    if not Assigned(AController) then begin
      AController := TOvcController.Create(AForm);
      try
        AController.Name := 'OvcController1';
      except
        AController.Free;
        AController := nil;
        raise;
      end;
    end;
    *)
  end;
end;

{*** TOvcComponent ***}

constructor TOvcComponent.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
end;

destructor TOvcComponent.Destroy;
begin
  FCollectionStreamer.Free;
  FCollectionStreamer := nil;

  inherited Destroy;
end;

function TOvcComponent.GetAbout : string;
begin
  Result := OrVersionStr;
end;

procedure TOvcComponent.SetAbout(const Value : string);
begin
end;


{Logic for streaming collections of sub-components}

function TOvcComponent.GetChildOwner: TComponent;
begin
  if assigned(FCollectionStreamer) then
    Result := FCollectionStreamer.Owner
  else
    Result := inherited GetChildOwner;
end;

procedure TOvcComponent.GetChildren(Proc: TGetChildProc; Root : TComponent);
begin
  if assigned(FCollectionStreamer) then
    CollectionStreamer.GetChildren(Proc, Root)
  else
    inherited GetChildren(Proc,Root);
end;

procedure TOvcComponent.Loaded;
begin
  if assigned(FCollectionStreamer) then
    FCollectionStreamer.Loaded;

  inherited Loaded;
end;

{*** TO32Component ***}
constructor TO32Component.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
end;

function TO32Component.GetAbout : string;
begin
  Result := OrVersionStr;
end;

procedure TO32Component.SetAbout(const Value : string);
begin
end;


{*** TOvcCollectible ***}
constructor TOvcCollectible.Create(AOwner : TComponent);
begin
  inherited Create(AOwner);

  if (AOwner is TOvcComponent) then begin
    if TOvcComponent(AOwner).CollectionStreamer = nil then
      raise Exception.Create(GetOrphStr(SCNoCollection));
    SetCollection(TOvcComponent(AOwner).CollectionStreamer.CollectionFromType(Self));
  end else
  if (AOwner is TOvcCustomControl) then begin
    if TOvcCustomControl(AOwner).CollectionStreamer = nil then
      raise Exception.Create(GetOrphStr(SCNoCollection));
    SetCollection(TOvcCustomControl(AOwner).CollectionStreamer.CollectionFromType(Self));
  end else
    raise Exception.Create(GetOrphStr(SCNotOvcDescendant));

  if (csDesigning in ComponentState)
  and (AOwner <> nil) then
    if ((AOwner is TOvcComponent) and not TOvcComponent(AOwner).FInternal)
    or ((AOwner is TOvcCollectibleControl) and not TOvcCollectibleControl(AOwner).FInternal)
    or ((AOwner is TOvcCustomControl) and not TOvcCustomControl(AOwner).FInternal) then
{$IFDEF VERSION5}
      if not (csLoading in AOwner.ComponentState) then
{$ELSE}
      if not (csLoading in AOwner.ComponentState) then
{$ENDIF}
        Name := GenerateName;
end;

destructor TOvcCollectible.Destroy;
var
  OldCollection : TOvcCollection;
begin
  OldCollection := Collection;
  SetCollection(nil);
  inherited Destroy;
  {mark dirty}
  if (csDesigning in ComponentState)
  and (OldCollection <> nil)
  and not (csDestroying in
    OldCollection.Owner.ComponentState) then begin
    OldCollection.Changed;
  end;
end;

function TOvcCollectible.GenerateName : string;
var
  PF : TWinControl;
  I  : Integer;
  S  : string;

  function SearchSubComponents(C : TComponent; const S : string) : TComponent;
  var
    I  : Integer;
  begin
    Result := C;
    if CompareText(S, Result.Name) = 0 then
      Exit;
    for I := 0 to C.ComponentCount-1 do begin
      Result := SearchSubComponents(C.Components[I], S);
      if Result <> nil then
        Exit;
    end;
    Result := nil;
  end;

  function FindComponentName(const S : string) : TComponent;
  begin
    Result := SearchSubComponents(PF, S);
  end;

begin
  I := 1;
  S := GetBaseName;
  Result := Format('%s%d', [S, I]);
  PF := Collection.ParentForm;
  if not Assigned(PF) then
    Exit;

  while FindComponentName(Result) <> nil do begin
    Inc(I);
    Result := Format('%s%d', [S, I]);
  end;
end;

procedure TOvcCollectible.SetName(const NewName : TComponentName);
begin
  inherited SetName(NewName);
  if not (csLoading in ComponentState) then
{$IFDEF VERSION5}
    if (csInLine in ComponentState) then
      Changed;
{$ENDIF}
  if (Collection <> nil)
  and (Collection.ItemEditor <> nil) then
    SendMessage(Collection.ItemEditor.Handle, OM_PROPCHANGE, 0, 0);
end;

function TOvcCollectible.GetBaseName : string;
begin
  Result := 'CollectionItem';
end;

function TOvcCollectible.GetDisplayText : string;
begin
  Result := ClassName;
end;

procedure TOvcCollectible.Changed;
begin
  if InChanged then exit;
  InChanged := True;
  try
    {$IFDEF Logging}
    LogMsg('TOvcCollectible.Changed');
    LogBoolean('assigned(FCollection)', assigned(FCollection));
    LogBoolean('(csInline in ComponentState)', (csInline in ComponentState));
    LogBoolean('csAncestor in Owner.ComponentState', csAncestor in Owner.ComponentState);
    {$ENDIF}
    if assigned(FCollection) then
        {$IFDEF Version5}
        if not (csInline in ComponentState) then
        {$ENDIF}
          FCollection.Changed;
  finally
    InChanged := False;
  end;
end;

function TOvcCollectible.GetIndex : Integer;
begin
  if assigned(FCollection) then
    Result := FCollection.FItems.IndexOf(Self)
  else
    Result := -1;
end;

procedure TOvcCollectible.SetIndex(Value : Integer);
begin
  if Value <> Index then begin
    if assigned(FCollection) then begin
      FCollection.FItems.Remove(Self);
      FCollection.FItems.Insert(Value,Self);
    end;
    Changed;
  end;
end;

procedure TOvcCollectible.SetCollection(Value : TOvcCollection);
begin
  if Collection <> Value then begin
    if Collection <> nil then
      Collection.FItems.Remove(Self);
    if Value <> nil then begin
      if not (Self is Value.ItemClass) then
        raise Exception.Create(GetOrphStr(SCItemIncompatible));
      Value.FItems.Add(Self);
    end;
    FCollection := Value;
  end;
end;



{===== TO32CollectionItem ============================================}

function TO32CollectionItem.GetAbout: String;
begin
  Result := OrVersionStr;
end;

procedure TO32CollectionItem.SetAbout(const Value: String);
begin
end;

procedure TO32CollectionItem.SetName(Value: String);
begin
  FName := Value;
end;
{=====}

{*** TOvcCollectibleControl ***}
constructor TOvcCollectibleControl.Create(AOwner : TComponent);
begin
  inherited Create(AOwner);

  if (AOwner is TOvcComponent) then begin
    if TOvcComponent(AOwner).CollectionStreamer = nil then
      raise Exception.Create(GetOrphStr(SCNoCollection));
    SetCollection(TOvcComponent(AOwner).CollectionStreamer.CollectionFromType(Self));
  end else
  if (AOwner is TOvcCustomControl) then begin
    if TOvcCustomControl(AOwner).CollectionStreamer = nil then
      raise Exception.Create(GetOrphStr(SCNoCollection));
    SetCollection(TOvcCustomControl(AOwner).CollectionStreamer.CollectionFromType(Self));
  end else
    raise Exception.Create(GetOrphStr(SCNotOvcDescendant));

  if (csDesigning in ComponentState)
  and (AOwner <> nil) then
      if ((AOwner is TOvcComponent) and not TOvcComponent(AOwner).FInternal)
      or ((AOwner is TOvcCollectibleControl) and not TOvcCollectibleControl(AOwner).FInternal)
      or ((AOwner is TOvcCustomControl) and not TOvcCustomControl(AOwner).FInternal) then
        if not (csLoading in AOwner.ComponentState)
         {$IFDEF Version5}
          and not (csInLine in AOwner.ComponentState)
         {$ENDIF}
          then Name := GenerateName;
end;

destructor TOvcCollectibleControl.Destroy;
var
  OldCollection : TOvcCollection;
begin
  OldCollection := Collection;
  SetCollection(nil);
  inherited Destroy;
  {mark dirty}
  if (csDesigning in ComponentState)
  and (OldCollection <> nil)
  and not (csDestroying in
    OldCollection.Owner.ComponentState) then begin
    OldCollection.Changed;
  end;
end;

function TOvcCollectibleControl.GenerateName : string;
var
  PF : TWinControl;
  I  : Integer;
  S  : string;

  function SearchSubComponents(C : TComponent; const S : string) : TComponent;
  var
    I  : Integer;
  begin
    Result := C;
    if CompareText(S, Result.Name) = 0 then
      Exit;
    for I := 0 to C.ComponentCount-1 do begin
      Result := SearchSubComponents(C.Components[I], S);
      if Result <> nil then
        Exit;
    end;
    Result := nil;
  end;

  function FindComponentName(const S : string) : TComponent;
  begin
    Result := SearchSubComponents(PF, S);
  end;

begin
  I := 1;
  S := GetBaseName;
  Result := Format('%s%d', [S, I]);
  PF := Collection.ParentForm;
  if not Assigned(PF) then
    Exit;

  while FindComponentName(Result) <> nil do begin
    Inc(I);
    Result := Format('%s%d', [S, I]);
  end;
end;

procedure TOvcCollectibleControl.SetName(const NewName : TComponentName);
begin
  inherited SetName(NewName);
  if not (csLoading in ComponentState) then
    {$IFDEF Version5}
    if not (csInLine in ComponentState) then
    {$ENDIF}
      Changed;
end;

function TOvcCollectibleControl.GetBaseName : string;
begin
  Result := 'CollectionItem';
end;

function TOvcCollectibleControl.GetDisplayText : string;
begin
  Result := ClassName;
end;

procedure TOvcCollectibleControl.Changed;
begin
  if InChanged then exit;
  InChanged := True;
  try
    if assigned(FCollection) then
       {$IFDEF Version5}
        if not (csInline in ComponentState) then
       {$ENDIF}
          FCollection.Changed;
  finally
    InChanged := False;
  end;
end;

function TOvcCollectibleControl.GetIndex : Integer;
begin
  if Collection <> nil then
    Result := Collection.FItems.IndexOf(Self)
  else
    Result := -1;
end;

procedure TOvcCollectibleControl.SetIndex(Value : Integer);
begin
  if Value <> Index then begin
    if Collection <> nil then begin
      Collection.FItems.Remove(Self);
      Collection.FItems.Insert(Value,Self);
    end;
    Changed;
  end;
end;

procedure TOvcCollectibleControl.SetCollection(Value : TOvcCollection);
begin
  if Collection <> Value then begin
    if Collection <> nil then
      Collection.FItems.Remove(Self);
    if Value <> nil then begin
      if not (Self is Value.ItemClass) then
        raise Exception.Create(GetOrphStr(SCItemIncompatible));
      Value.FItems.Add(Self);
    end;
    FCollection := Value;
  end;
end;

{*** TOvcController ***}
constructor TOvcController.Create(AOwner : TComponent);
begin
  inherited Create(AOwner);

  {create the command processor}
  FEntryCommands := TOvcCommandProcessor.Create;
  FBaseEFOptions := [efoAutoSelect, efoBeepOnError, efoInsertPushes];
  FEpoch         := DefaultEpoch;
  FErrorPending  := False;
  FInsertMode    := True;

{$IFNDEF LCL}
  {create the general use timer pool}
  FTimerPool     := TOvcTimerPool.Create(Self);
  FTimerPool.OnAllTriggers := DoOnTimerTrigger;
{$ENDIF}
end;

procedure TOvcController.cWndProc(var Msg : TMessage);
  {-window procedure}
var
  C : TWinControl;
begin
  C := TWinControl(Msg.lParam);
  try
    with Msg do begin
      case Msg of
        OM_SETFOCUS :
          begin
            C.Show;
            if C.CanFocus then
              C.SetFocus;
          end;
        OM_PREEDIT :
          if Assigned(FOnPreEdit) then
            FOnPreEdit(TWinControl(lParam), FindControl(wParam));
        OM_POSTEDIT :
          if Assigned(FOnPostEdit) then
            FOnPostEdit(TWinControl(lParam), FindControl(wParam));
        OM_DELAYNOTIFY :
          if Assigned(FOnDelayNotify) then
            FOnDelayNotify(TObject(lParam), wParam);
      else
        Result := DefWindowProc(Handle, Msg, wParam, lParam);
      end;
    end;
  except
    Application.HandleException(Self);
  end;
end;

{$IFDEF LCL}
function TOvcController.PostMessage(hWnd: HWND; Msg: UINT; wParam: WPARAM; lParam: LPARAM): BOOL;
var
  AMsg : TMessage;
begin
  if hWnd = Handle then
    begin
    AMsg.Msg := Msg;
    AMsg.WParam := wParam;
    AMsg.LParam := lParam;
    cWndProc(AMsg);
    end
  else
{$IFDEF MSWINDOWS}
    Result := MyMisc.PostMessage(hWnd, Msg, wParam, lParam);
{$ELSE}
    Result := LclIntf.PostMessage(hWnd, Msg, wParam, lParam);
{$ENDIF}
end;    
{$ENDIF}

procedure TOvcController.DelayNotify(Sender : TObject; NotifyCode : Word);
begin
  if Assigned(FOnDelayNotify) then
    PostMessage(Handle, OM_DELAYNOTIFY, NotifyCode, LPARAM(Sender));  //64
end;

destructor TOvcController.Destroy;
begin
  {destroy the command processor}
  FEntryCommands.Free;
  FEntryCommands := nil;

{$IFNDEF LCL}
  FTimerPool.Free;
  FTimerPool := nil;
{$ENDIF}

  {destroy window handle, if created}
  DestroyHandle;

  inherited Destroy;
end;

procedure TOvcController.DestroyHandle;
begin
{$IFNDEF LCL}
  if FHandle <> 0 then
  {$IFDEF VERSION6}
    Classes.DeallocateHWnd(FHandle);
  {$ELSE}
    DeallocateHWnd(FHandle);
  {$ENDIF}
{$ENDIF}

  FHandle := 0;
end;

procedure TOvcController.DoOnError(Sender : TObject; ErrorCode : Word;
                         const ErrorMsg : string);
begin
  if Assigned(FOnError) then
    FOnError(Sender, ErrorCode, ErrorMsg)
  else
    MessageDlg(ErrorMsg, mtError, [mbOK], 0);
end;

procedure TOvcController.DoOnPostEdit(Sender : TObject; GainingControl : TWinControl);
var
  H : hWnd;
begin
  if Assigned(GainingControl) then
    H := GainingControl.Handle
  else
    H := 0;

  PostMessage(Handle, OM_POSTEDIT, H, LPARAM(Sender));  //64
end;

procedure TOvcController.DoOnPreEdit(Sender : TObject; LosingControl : TWinControl);
var
  H : hWnd;
begin
  if Assigned(LosingControl) then
    H := LosingControl.Handle
  else
    H := 0;

  PostMessage(Handle, OM_PREEDIT, H, LPARAM(Sender));  //64
end;

procedure TOvcController.DoOnTimerTrigger(Sender : TObject; Handle : Integer;
                         Interval : Cardinal; ElapsedTime : LongInt);
begin
{$IFNDEF LCL}
  if Assigned(FOnTimerTrigger) then
    FOnTimerTrigger(Sender, Handle, Interval, ElapsedTime);
{$ENDIF}
end;

function TOvcController.GetEpoch : Integer;
begin
  Result := FEpoch;
  if Assigned(FOnGetEpoch) then
    FOnGetEpoch(Self, Result);
end;

{ - HWnd changed to TOvcHWnd for BCB Compatibility }
function TOvcController.GetHandle : TOvcHWnd{hWnd};
begin
// AllocateHWnd not available in LCL to create non-visual window that
// responds to messages sent to controller. But shouldn't be needed
// with controller's PostMessage method that intercepts messages.
{$IFNDEF LCL}
  if FHandle = 0 then
  {$IFDEF VERSION6}
    FHandle := Classes.AllocateHWnd(cWndProc);
  {$ELSE}
    FHandle := AllocateHWnd(cWndProc);
  {$ENDIF}
{$ENDIF}
  Result := FHandle;
end;

{ - HWnd changed to TOvcHWnd for BCB Compatibility }
function TOvcController.IsSpecialButton(H : TOvcHWnd{hWnd}) : Boolean;
begin
  Result := False;
  if Assigned(FOnIsSpecialControl) then
    FOnIsSpecialControl(Self, FindControl(H), Result);
end;

procedure TOvcController.MarkAsUninitialized(Uninitialized : Boolean);
  {-mark all entry fields on form as uninitialized}
var
  I  : Integer;

  procedure MarkField(C : TComponent);
  var
    J : Integer;
  begin
    {first, see if this component is an entry field}
    if C is TOvcBaseEntryField then
      TOvcBaseEntryField(C).Uninitialized := Uninitialized;

    {recurse through all child components}
    for J := 0 to C.ComponentCount-1 do
      MarkField(C.Components[J]);
  end;

begin
{$IFDEF VERSION5}
  if (Owner is TCustomForm) or (Owner is TCustomFrame) then
    with TWinControl(Owner) do
{$ELSE}
  if Owner is TForm then
    with TForm(Owner) do
{$ENDIF}
      for I := 0 to ComponentCount-1 do
        MarkField(Components[I]);
end;

procedure TOvcController.SetEpoch(Value : Integer);
begin
  if Value <> FEpoch then
    if (Value >= MinYear) and (Value <= MaxYear) then
      FEpoch := Value;
end;

function TOvcController.ValidateEntryFields : TComponent;
begin
  {if error, report it and send focus to field with error}
  Result := ValidateEntryFieldsEx(True, True);
end;

function TOvcController.ValidateEntryFieldsEx(ReportError, ChangeFocus : Boolean) : TComponent;
var
  I  : Integer;

  procedure ValidateEF(C : TComponent);
  var
    J  : Integer;
    EF : TLocalEF absolute C;
  begin
    {see if this component is an entry field}
    if (C is TOvcBaseEntryField) then begin

      {don't validate invisible or disabled fields}
      if not EF.Visible or not EF.Enabled then
        Exit;

      {ask entry field to validate itself}
      if (EF.ValidateContents(False) <> 0) then begin
        {remember only the first invalid field found}
        if not Assigned(Result) then
          Result := EF;

        {tell the entry field to report the error}
        if ReportError and not ErrorPending then
          PostMessage(EF.Handle, OM_REPORTERROR, EF.LastError, 0);

        {ask the controller to give the focus back to this field}
        if ChangeFocus and not ErrorPending then begin
          PostMessage(Handle, OM_SETFOCUS, 0, LPARAM(EF));  //64
          ErrorPending := True;
        end;

        {exit if we are reporting the error or changing the focus}
        if (ReportError or ChangeFocus) then
          Exit;
      end;
    end;

    {recurse through all child components}
    for J := 0 to C.ComponentCount-1 do begin
      ValidateEf(C.Components[J]);

      {exit if we've already found an error and should stop}
      if Assigned(Result) and (ReportError or ChangeFocus) then
        Break;
    end;
  end;

begin
  Result := nil;
{$IFDEF VERSION5}
  if ((Owner is TCustomForm) or (Owner is TCustomFrame)) then
    with TWinControl(Owner) do
{$ELSE}
  if Owner is TForm then
    with TForm(Owner) do
{$ENDIF}
      for I := 0 to ComponentCount-1 do begin
        ValidateEf(Components[I]);

        {stop checking if reporting the error or changing focus}
        if Assigned(Result) and (ReportError or ChangeFocus) then
          Break ;
      end;
end;

function TOvcController.ValidateTheseEntryFields(const Fields : array of TComponent) : TComponent;
  {-ask the specified entry fields to validate their contents. Return nil
    if no error, else return pointer to field with error}
var
  I  : Integer;
  EF : TLocalEF;
begin
  Result := nil;

  for I := Low(Fields) to High(Fields) do begin
    if Fields[I] is TOvcBaseEntryField then begin
      EF := TLocalEF(Fields[I]);

      {ask entry field to validate itself}
      if (EF.ValidateContents(False) <> 0) then begin
        Result := EF;

        {tell the entry field to report the error}
        if not ErrorPending then
          PostMessage(EF.Handle, OM_REPORTERROR, EF.LastError, 0);

        {ask the controller to give the focus back to this field}
        if not ErrorPending then begin
          PostMessage(Handle, OM_SETFOCUS, 0, LPARAM(EF));  //64
          ErrorPending := True;
        end;

        Exit;
      end;

    end;
  end;
end;

{*** TOvcGraphicControl ***}

constructor TOvcGraphicControl.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
end;

destructor TOvcGraphicControl.Destroy;
begin
  FCollectionStreamer.Free;
  FCollectionStreamer := nil;
  inherited Destroy;
end;


procedure TOvcGraphicControl.Loaded;
begin
  if Assigned(FCollectionStreamer) then
    FCollectionStreamer.Loaded;
  inherited Loaded;
end;

{Logic for streaming collections of sub-components}

function TOvcGraphicControl.GetChildOwner: TComponent;
begin
  if Assigned(FCollectionStreamer) then
    Result := FCollectionStreamer.Owner
  else
    Result := inherited GetChildOwner;
end;

procedure TOvcGraphicControl.GetChildren(Proc: TGetChildProc; Root : TComponent);
begin
  if Assigned(FCollectionStreamer) then
    CollectionStreamer.GetChildren(Proc, Root)
  else
    inherited GetChildren(Proc, Root);
end;

function TOvcGraphicControl.GetAbout : string;
begin
  Result := OrVersionStr;
end;


procedure TOvcGraphicControl.SetAbout(const Value : string);
begin
end;


{*** TO32CustomControl ***}

procedure TO32CustomControl.CMVisibleChanged(var Msg : TMessage);
begin
  inherited;

  if csLoading in ComponentState then
    Exit;

  if LabelInfo.Visible then
    AttachedLabel.Visible := Visible;
end;

constructor TO32CustomControl.Create(AOwner : TComponent);
begin
  inherited Create(AOwner);

  DefaultLabelPosition := lpTopLeft;

  FLabelInfo := TOvcLabelInfo.Create;
  FLabelInfo.OnChange := LabelChange;
  FLabelInfo.OnAttach := LabelAttach;
end;

procedure TO32CustomControl.CreateWnd;
begin
  inherited CreateWnd;
end;

destructor TO32CustomControl.Destroy;
begin
  FLabelInfo.Visible := False;
  FLabelInfo.Free;
  FLabelInfo := nil;
  inherited Destroy;
end;

procedure TO32CustomControl.DoOnMouseWheel(Shift : TShiftState;
                                 Delta, XPos, YPos : SmallInt);
// Another TurboPower bug? Their TMouseWheelEvent expects Word
//  params, yet passing SmallInts here. Delta is negative when 
//  scroll down, which will raise exception if a descendent class
//  with a TMouseWheelEvent handler has range checking turned on.
// Note that their TMouseWheelEvent redefines LCL's.
begin
  if Assigned(FOnMouseWheel) then
    FOnMouseWheel(Self, Shift, Delta, XPos, YPos);
end;

function TO32CustomControl.GetAttachedLabel : TOvcAttachedLabel;
begin
  if not FLabelInfo.Visible then
    raise Exception.Create(GetOrphStr(SCLabelNotAttached));

  Result := FLabelInfo.ALabel;
end;

function TO32CustomControl.GetAbout : string;
begin
  Result := OrVersionStr;
end;

procedure TO32CustomControl.LabelAttach(Sender : TObject; Value : Boolean);
var
{$IFDEF VERSION5}
  PF : TWinControl;
{$ELSE}
  PF : TForm;
{$ENDIF}
  S  : string;
begin
  if (csLoading in ComponentState) then
    Exit;

{$IFDEF VERSION5}
  PF := GetImmediateParentForm(Self);
{$ELSE}
  PF := TForm(GetParentForm(Self));
{$ENDIF}
  if Value then begin
    if Assigned(PF) then begin
      FLabelInfo.ALabel.Free;
      FLabelInfo.ALabel := TOvcAttachedLabel.CreateEx(PF, Self);
      FLabelInfo.ALabel.Parent := Parent;

      S := GenerateComponentName(PF, Name + 'Label');
      FLabelInfo.ALabel.Name := S;
      FLabelInfo.ALabel.Caption := S;

      FLabelInfo.SetOffsets(0, 0);
      PositionLabel;
      FLabelInfo.ALabel.BringToFront;

      {force auto size}
      FLabelInfo.ALabel.AutoSize := True;
    end;
  end else begin
    if Assigned(PF) then begin
      FLabelInfo.ALabel.Free;
      FLabelInfo.ALabel := nil;
    end;
  end;
end;

procedure TO32CustomControl.LabelChange(Sender : TObject);
begin
  if not (csLoading in ComponentState) then
    PositionLabel;
end;

procedure TO32CustomControl.Notification(AComponent : TComponent; Operation : TOperation);
var
{$IFDEF VERSION5}
  PF : TWinControl;
{$ELSE}
  PF : TForm;
{$ENDIF}
begin
  inherited Notification(AComponent, Operation);

  if Operation = opRemove then
    if Assigned(FLabelInfo) and (AComponent = FLabelInfo.ALabel) then begin
{$IFDEF VERSION5}
      PF := GetImmediateParentForm(Self);
{$ELSE}
      PF := TForm(GetParentForm(Self));
{$ENDIF}
      if Assigned(PF) and not (csDestroying in PF.ComponentState) then begin
        FLabelInfo.FVisible := False;
        FLabelInfo.ALabel := nil;
      end;
    end;
end;

procedure TO32CustomControl.OMAfterEnter(var Msg : TMessage);
begin
  if Assigned(FAfterEnter) then
    FAfterEnter(Self);
end;

procedure TO32CustomControl.OMAfterExit(var Msg : TMessage);
begin
  if Assigned(FAfterExit) then
    FAfterExit(Self);
end;

procedure TO32CustomControl.OMAssignLabel(var Msg : TMessage);
begin
  FLabelInfo.ALabel := TOvcAttachedLabel(Msg.lParam);
end;

procedure TO32CustomControl.OMPositionLabel(var Msg : TMessage);
const
  DX : Integer = 0;
  DY : Integer = 0;
begin
  if FLabelInfo.Visible and
     Assigned(FLabelInfo.ALabel) and
     (FLabelInfo.ALabel.Parent <> nil) and
     not (csLoading in ComponentState) then begin
    if DefaultLabelPosition = lpTopLeft then begin
      DX := FLabelInfo.ALabel.Left - Left;
      DY := FLabelInfo.ALabel.Top + FLabelInfo.ALabel.Height - Top;
    end else begin
      DX := FLabelInfo.ALabel.Left - Left;
      DY := FLabelInfo.ALabel.Top - Top - Height;
    end;
    if (DX <> FLabelInfo.OffsetX) or (DY <> FLabelInfo.OffsetY) then
      PositionLabel;
  end;
end;

procedure TO32CustomControl.OMRecordLabelPosition(var Msg : TMessage);
begin
  if Assigned(FLabelInfo.ALabel) and
     (FLabelInfo.ALabel.Parent <> nil) then begin
    {if the label was cut and then pasted, this will complete the re-attachment}
    FLabelInfo.FVisible := True;

    if DefaultLabelPosition = lpTopLeft then
      FLabelInfo.SetOffsets(FLabelInfo.ALabel.Left - Left,
        FLabelInfo.ALabel.Top + FLabelInfo.ALabel.Height - Top)
    else
      FLabelInfo.SetOffsets(FLabelInfo.ALabel.Left - Left,
        FLabelInfo.ALabel.Top - Top - Height);
  end;
end;

procedure TO32CustomControl.PositionLabel;
begin
  if FLabelInfo.Visible and Assigned(FLabelInfo.ALabel) and
                           (FLabelInfo.ALabel.Parent <> nil) and
                           not (csLoading in ComponentState) then begin

    if DefaultLabelPosition = lpTopLeft then begin
      FLabelInfo.ALabel.SetBounds(Left + FLabelInfo.OffsetX,
                         FLabelInfo.OffsetY - FLabelInfo.ALabel.Height + Top,
                         FLabelInfo.ALabel.Width, FLabelInfo.ALabel.Height);
    end else begin
      FLabelInfo.ALabel.SetBounds(Left + FLabelInfo.OffsetX,
                         FLabelInfo.OffsetY + Top + Height,
                         FLabelInfo.ALabel.Width, FLabelInfo.ALabel.Height);
    end;
  end;
end;

procedure TO32CustomControl.SetBounds(ALeft, ATop, AWidth, AHeight : Integer);
begin
  inherited SetBounds(ALeft, ATop, AWidth, AHeight);

  if HandleAllocated then
    PostMessage(Handle, OM_POSITIONLABEL, 0, 0);
end;

procedure TO32CustomControl.SetAbout(const Value : string);
begin
end;

procedure TO32CustomControl.WMKillFocus(var Msg : TWMKillFocus);
begin
  inherited;

  PostMessage(Handle, OM_AFTEREXIT, 0, 0);
end;

procedure TO32CustomControl.WMMouseWheel(var Msg : TMessage);
// TurboPower bug: They should have used TWMMouseWheel instead of
//  TMessage. Delta is negative on scroll down, but extracting it
//  from wParam with HIWORD returns a Word, which causes an
//  exception when passed as SmallInt to DoOnMouseWheel when 
//  range checking turned on. Fix is to cast delta as SmallInt.
begin
  with Msg do
    DoOnMouseWheel(KeysToShiftState(LOWORD(wParam)) {fwKeys},
                   SmallInt(HIWORD(wParam)) {zDelta},  //bug fix
                   LOWORD(lParam) {xPos},   HIWORD(lParam) {yPos});
end;

procedure TO32CustomControl.WMSetFocus(var Msg : TWMSetFocus);
begin
  inherited;

  PostMessage(Handle, OM_AFTERENTER, 0, 0);
end;

{*** End - TO32CustomCOntrol ***}


{*** TOvcCustomControl ***}
procedure TOvcCustomControl.CMVisibleChanged(var Msg : TMessage);
begin
  inherited;

  if csLoading in ComponentState then
    Exit;

  if LabelInfo.Visible then
    AttachedLabel.Visible := Visible;
end;

constructor TOvcCustomControl.Create(AOwner : TComponent);
begin
  inherited Create(AOwner);

  DefaultLabelPosition := lpTopLeft;

  FLabelInfo := TOvcLabelInfo.Create;
  FLabelInfo.OnChange := LabelChange;
  FLabelInfo.OnAttach := LabelAttach;
end;

procedure TOvcCustomControl.CreateWnd;
begin
  inherited CreateWnd;
end;

destructor TOvcCustomControl.Destroy;
begin
  FLabelInfo.Visible := False;
  FLabelInfo.Free;
  FLabelInfo := nil;
  FCollectionStreamer.Free;
  FCollectionStreamer := nil;
  inherited Destroy;
end;

procedure TOvcCustomControl.DoOnMouseWheel(Shift : TShiftState;
                                 Delta, XPos, YPos : SmallInt);
begin
  if Assigned(FOnMouseWheel) then
    FOnMouseWheel(Self, Shift, Delta, XPos, YPos);
end;

function TOvcCustomControl.GetAttachedLabel : TOvcAttachedLabel;
begin
  if not FLabelInfo.Visible then
    raise Exception.Create(GetOrphStr(SCLabelNotAttached));

  Result := FLabelInfo.ALabel;
end;

function TOvcCustomControl.GetAbout : string;
begin
  Result := OrVersionStr;
end;

procedure TOvcCustomControl.LabelAttach(Sender : TObject; Value : Boolean);
var
{$IFDEF VERSION5}
  PF : TWinControl;
{$ELSE}
  PF : TForm;
{$ENDIF}
  S  : string;
begin
  if (csLoading in ComponentState) then
    Exit;

{$IFDEF VERSION5}
  PF := GetImmediateParentForm(Self);
{$ELSE}
  PF := TForm(GetParentForm(Self));
{$ENDIF}
  if Value then begin
    if Assigned(PF) then begin
      FLabelInfo.ALabel.Free;
      FLabelInfo.ALabel := TOvcAttachedLabel.CreateEx(PF, Self);
      FLabelInfo.ALabel.Parent := Parent;

      S := GenerateComponentName(PF, Name + 'Label');
      FLabelInfo.ALabel.Name := S;
      FLabelInfo.ALabel.Caption := S;

      FLabelInfo.SetOffsets(0, 0);
      PositionLabel;
      FLabelInfo.ALabel.BringToFront;

      {force auto size}
      FLabelInfo.ALabel.AutoSize := True;
    end;
  end else begin
    if Assigned(PF) then begin
      FLabelInfo.ALabel.Free;
      FLabelInfo.ALabel := nil;
    end;
  end;
end;

procedure TOvcCustomControl.LabelChange(Sender : TObject);
begin
  if not (csLoading in ComponentState) then
    PositionLabel;
end;

procedure TOvcCustomControl.Notification(AComponent : TComponent; Operation : TOperation);
var
{$IFDEF VERSION5}
  PF : TWinControl;
{$ELSE}
  PF : TForm;
{$ENDIF}
begin
  inherited Notification(AComponent, Operation);

  if Operation = opRemove then
    if Assigned(FLabelInfo) and (AComponent = FLabelInfo.ALabel) then begin
{$IFDEF VERSION5}
      PF := GetImmediateParentForm(Self);
{$ELSE}
      PF := TForm(GetParentForm(Self));
{$ENDIF}
      if Assigned(PF) and not (csDestroying in PF.ComponentState) then begin
        FLabelInfo.FVisible := False;
        FLabelInfo.ALabel := nil;
      end;
    end;
end;

procedure TOvcCustomControl.OMAfterEnter(var Msg : TMessage);
begin
  if Assigned(FAfterEnter) then
    FAfterEnter(Self);
end;

procedure TOvcCustomControl.OMAfterExit(var Msg : TMessage);
begin
  if Assigned(FAfterExit) then
    FAfterExit(Self);
end;

procedure TOvcCustomControl.OMAssignLabel(var Msg : TMessage);
begin
  FLabelInfo.ALabel := TOvcAttachedLabel(Msg.lParam);
end;

procedure TOvcCustomControl.OMPositionLabel(var Msg : TMessage);
const
  DX : Integer = 0;
  DY : Integer = 0;
begin
  if FLabelInfo.Visible and
     Assigned(FLabelInfo.ALabel) and
     (FLabelInfo.ALabel.Parent <> nil) and
     not (csLoading in ComponentState) then begin
    if DefaultLabelPosition = lpTopLeft then begin
      DX := FLabelInfo.ALabel.Left - Left;
      DY := FLabelInfo.ALabel.Top + FLabelInfo.ALabel.Height - Top;
    end else begin
      DX := FLabelInfo.ALabel.Left - Left;
      DY := FLabelInfo.ALabel.Top - Top - Height;
    end;
    if (DX <> FLabelInfo.OffsetX) or (DY <> FLabelInfo.OffsetY) then
      PositionLabel;
  end;
end;

procedure TOvcCustomControl.OMRecordLabelPosition(var Msg : TMessage);
begin
  if Assigned(FLabelInfo.ALabel) and
     (FLabelInfo.ALabel.Parent <> nil) then begin
    {if the label was cut and then pasted, this will complete the re-attachment}
    FLabelInfo.FVisible := True;

    if DefaultLabelPosition = lpTopLeft then
      FLabelInfo.SetOffsets(FLabelInfo.ALabel.Left - Left,
        FLabelInfo.ALabel.Top + FLabelInfo.ALabel.Height - Top)
    else
      FLabelInfo.SetOffsets(FLabelInfo.ALabel.Left - Left,
        FLabelInfo.ALabel.Top - Top - Height);
  end;
end;

procedure TOvcCustomControl.PositionLabel;
begin
  if FLabelInfo.Visible and Assigned(FLabelInfo.ALabel) and
                           (FLabelInfo.ALabel.Parent <> nil) and
                           not (csLoading in ComponentState) then begin

    if DefaultLabelPosition = lpTopLeft then begin
      FLabelInfo.ALabel.SetBounds(Left + FLabelInfo.OffsetX,
                         FLabelInfo.OffsetY - FLabelInfo.ALabel.Height + Top,
                         FLabelInfo.ALabel.Width, FLabelInfo.ALabel.Height);
    end else begin
      FLabelInfo.ALabel.SetBounds(Left + FLabelInfo.OffsetX,
                         FLabelInfo.OffsetY + Top + Height,
                         FLabelInfo.ALabel.Width, FLabelInfo.ALabel.Height);
    end;
  end;
end;

procedure TOvcCustomControl.SetBounds(ALeft, ATop, AWidth, AHeight : Integer);
begin
  inherited SetBounds(ALeft, ATop, AWidth, AHeight);

  if HandleAllocated then
    PostMessage(Handle, OM_POSITIONLABEL, 0, 0);
end;

procedure TOvcCustomControl.SetAbout(const Value : string);
begin
end;

procedure TOvcCustomControl.WMKillFocus(var Msg : TWMKillFocus);
begin
  inherited;

  PostMessage(Handle, OM_AFTEREXIT, 0, 0);
end;

procedure TOvcCustomControl.WMMouseWheel(var Msg : TMessage);
// See TurboPower bug comments above.
begin
  with Msg do
    DoOnMouseWheel(KeysToShiftState(LOWORD(wParam)) {fwKeys},
                   SmallInt(HIWORD(wParam)) {zDelta},  //bug fix
                   LOWORD(lParam) {xPos},   HIWORD(lParam) {yPos});
end;

procedure TOvcCustomControl.WMSetFocus(var Msg : TWMSetFocus);
begin
  inherited;

  PostMessage(Handle, OM_AFTERENTER, 0, 0);
end;


{Logic for streaming collections of sub-components}

function TOvcCustomControl.GetChildOwner: TComponent;
begin
  if Assigned(FCollectionStreamer) then
    Result := FCollectionStreamer.Owner
  else
    Result := inherited GetChildOwner;
end;

procedure TOvcCustomControl.GetChildren(Proc: TGetChildProc; Root : TComponent);
begin
  if Assigned(FCollectionStreamer) then
    CollectionStreamer.GetChildren(Proc, Root)
  else
    inherited GetChildren(Proc, Root);
end;

procedure TOvcCustomControl.Loaded;
begin
  if Assigned(FCollectionStreamer) then
    FCollectionStreamer.Loaded;
  inherited Loaded;
end;

{*** TOvcCustomControlEx ***}

function TOvcCustomControlEx.ControllerAssigned : Boolean;
begin
  Result := Assigned(FController);
end;

procedure TOvcCustomControlEx.CreateWnd;
var
  OurForm : TWinControl;

begin
  OurForm := GetImmediateParentForm(Self);

  {do this only when the component is first dropped on the form, not during loading}
  if (csDesigning in ComponentState) and not (csLoading in ComponentState) then
    ResolveController(OurForm, FController);

  if not Assigned(FController) and not (csLoading in ComponentState) then begin
    {try to find a controller on this form that we can use}
    FController := FindController(OurForm);

    {if not found and we are not designing, use default controller}
    if not Assigned(FController) and not (csDesigning in ComponentState) then
      FController := DefaultController;
  end;

  inherited CreateWnd;
end;

function TOvcCustomControlEx.GetController: TOvcController;
begin
  if FController = nil then
    Result := DefaultController
  else
    Result := FController;
end;

procedure TOvcCustomControlEx.Notification(AComponent : TComponent; Operation : TOperation);
begin
  inherited Notification(AComponent, Operation);

  if Operation = opRemove then begin
    if (AComponent = FController) then
      FController := nil;
  end else if (Operation = opInsert) and (FController = nil) and
              (AComponent is TOvcController) then
    FController := TOvcController(AComponent);
end;

procedure TOvcCustomControlEx.SetController(Value : TOvcController);
begin
  if not (TObject(Value) is TOvcController) then
    Value := nil;
  FController := Value;
  if Value <> nil then
    Value.FreeNotification(Self);
end;

function TOvcCollection.Add : TComponent;
begin
  if not Assigned(FItemClass) then
    raise Exception.Create(GetOrphStr(SCClassNotSet));
  Result := FItemClass.Create(Owner);
  Changed;
  if ItemEditor <> nil then
    SendMessage(ItemEditor.Handle, OM_PROPCHANGE, 0, 0);
end;

procedure TOvcCollection.Changed;
var
  Parent : TForm;
begin
  {$IFDEF Logging}
  LogMsg('TOvcCollection.Changed');
  LogBoolean('InChanged', InChanged);
  {$ENDIF}
  if InChanged then exit;
  InChanged := True;
  try
    Parent := ParentForm;
    if Parent <> nil then begin
      {$IFDEF Logging}
      LogString('Parent.ClassName', Parent.ClassName);
      LogBoolean('(csLoading in Parent.ComponentState)', (csLoading in Parent.ComponentState));
      {$ENDIF}
      if not (csLoading in Parent.ComponentState)
      and (csDesigning in Parent.ComponentState) then begin
        {$IFDEF Logging}
        LogBoolean('TForm(Parent).Designer <> nil', TForm(Parent).Designer <> nil);
        LogBoolean('InLoaded', InLoaded);
        LogBoolean('IsLoaded', IsLoaded);
        LogBoolean('(csAncestor in Owner.ComponentState)', (csAncestor in Owner.ComponentState));
        LogBoolean('Stored', Stored);
        {$ENDIF}
        {$IFDEF VERSION5}
        if (TForm(Parent).Designer <> nil)
        {$ELSE}
        if (Parent.Designer <> nil)
        {$ENDIF}
        and not InLoaded
        and IsLoaded
        and not (csAncestor in Owner.ComponentState)
        and Stored then
          {$IFDEF VERSION5}
          TForm(Parent).Designer.Modified;
          {$ELSE}
          Parent.Designer.Modified;
          {$ENDIF}
        if (ItemEditor <> nil)
        and not (csAncestor in Owner.ComponentState)
        then
          SendMessage(ItemEditor.Handle, OM_PROPCHANGE, 0, 0);
      end;
      if Assigned(FOnChanged) then
        FOnChanged(Self);
    end;
  finally
    InChanged := False;
  end;
end;

procedure TOvcCollection.Clear;
{$IFDEF Version5}
var
  i : Integer;
{$ENDIF}
begin
  {$IFDEF Version5}
  for i := Count - 1 downto 0 do
    if not (csAncestor in Item[i].ComponentState) then
      Item[i].Free;
  {$ELSE}
  while Count > 0 do
    Item[0].Free;
  {$ENDIF}
  if ItemEditor <> nil then
    SendMessage(ItemEditor.Handle, OM_PROPCHANGE, 0, 0);
end;

constructor TOvcCollection.Create(AOwner : TComponent;
                                  ItemClass : TOvcCollectibleClass);
begin
  inherited Create;
  FStored := True;
  FItemClass := ItemClass;
  FItems := TList.Create;
  FOwner := AOwner;

  if (AOwner is TOvcComponent) then
    begin
      if TOvcComponent(AOwner).CollectionStreamer = nil then
        TOvcComponent(AOwner).CollectionStreamer := TOvcCollectionStreamer.Create(AOwner);
      FStreamer := TOvcComponent(AOwner).CollectionStreamer;
      FStreamer.FCollectionList.Add(Self);
    end
  else
  if (AOwner is TOvcCustomControl) then
    begin
      if TOvcCustomControl(AOwner).CollectionStreamer = nil then
        TOvcCustomControl(AOwner).CollectionStreamer := TOvcCollectionStreamer.Create(AOwner);
      FStreamer := TOvcCustomControl(AOwner).CollectionStreamer;
      FStreamer.FCollectionList.Add(Self);
    end
  else
    raise Exception.Create(GetOrphStr(SCNotOvcDescendant));
end;

procedure TOvcCollection.Delete(Index : Integer);
begin
  if (Index > -1) and (Index < Count) then
    Item[Index].Free;
  Changed;
end;

destructor TOvcCollection.Destroy;
begin
  ItemEditor.Free;
  if (Owner is TOvcComponent) then
    TOvcComponent(Owner).CollectionStreamer.FCollectionList.Remove(Self)
  else
    TOvcCustomControl(Owner).CollectionStreamer.FCollectionList.Remove(Self);
  Clear;
  FItems.Free;
  inherited Destroy;
end;

procedure TOvcCollection.DoOnItemSelected(Index : Integer);
begin
  if Assigned(FOnItemSelected) then
    FOnItemSelected(Self, Index);
end;

function TOvcCollection.GetCount : Integer;
begin
  Result := FItems.Count;
end;

function TOvcCollection.GetEditorCaption : string;
begin
  Result := 'Editing ' + ClassName;
  if Assigned(FOnGetEditorCaption) then
    FOnGetEditorCaption(Result);
end;

function TOvcCollection.GetItem(Index : Integer) : TComponent;
begin
  Result := TComponent(FItems[Index]);
end;

function TOvcCollection.Insert(Index : Integer) : TComponent;
begin
  if (Index < 0) or (Index > Count) then
    Index := Count;
  Result := Add;
  if Result is TOvcCollectible then
    TOvcCollectible(Item[Count-1]).Index := Index
  else
  if Result is TOvcCollectibleControl then
    TOvcCollectibleControl(Item[Count-1]).Index := Index
  else
    Result := nil;
end;

function TOvcCollection.ItemByName(const Name : string) : TComponent;
var
  i : Integer;
begin
  for i := 0 to pred(Count) do
    if Item[i].Name = Name then begin
      Result := Item[i];
      exit;
    end;
  Result := nil;
end;

procedure TOvcCollection.Loaded;
begin
  InLoaded := True;
  try
    Changed;
  finally
    InLoaded := False;
  end;
  IsLoaded := True;
end;

function TOvcCollection.ParentForm : TForm;
var
  Temp : TObject;
begin
  Temp := Owner;
  while (Temp <> nil) and not (Temp is TForm) do
    Temp := TComponent(Temp).Owner;
  Result := TForm(Temp);
end;

procedure TOvcCollection.SetItem(Index : Integer; Value : TComponent);
begin
  TOvcCollectible(FItems[Index]).Assign(Value);
end;

procedure TOvcCollectionStreamer.Clear;
var
  I : Integer;
begin
  for I := 0 to pred(FCollectionList.Count) do
    TOvcCollection(FCollectionList[I]).Clear;
end;


{===== TO32Collection ================================================}

constructor TO32Collection.Create(AOwner : TPersistent;
                                  ItemClass : TCollectionItemClass);
begin
  FOwner := AOwner;
  Inherited Create(ItemClass);
end;

destructor TO32Collection.Destroy;
begin
  ItemEditor.Free;
  Clear;
  inherited Destroy;
end;

procedure TO32Collection.DoOnItemSelected(Index : Integer);
begin
  if Assigned(FOnItemSelected) then
    FOnItemSelected(Self, Index);
end;

function TO32Collection.GetCount : Integer;
begin
  Result := inherited Count;
end;

function TO32Collection.GetEditorCaption : string;
begin
  Result := 'Editing ' + ClassName;
  if Assigned(FOnGetEditorCaption) then
    FOnGetEditorCaption(Result);
end;

function TO32Collection.Add : TO32CollectionItem;
begin
  Result := TO32CollectionItem(inherited Add);
  if ItemEditor <> nil then
    SendMessage(ItemEditor.Handle, OM_PROPCHANGE, 0, 0);
end;

{$IFNDEF VERSION4}
function TO32Collection.Insert(Index: Integer): TO32CollectionItem;
var
  I: Integer;
begin
  result := Add;
  for I := Index to Count - 2 do
    Items[I].Index := I + 1;
  Items[Count - 1].Index := Index;
end;
{$ENDIF}

function TO32Collection.GetItem(Index : Integer) : TO32CollectionItem;
begin
  Result := TO32CollectionItem(inherited GetItem(Index));
end;

function TO32Collection.GetOwner: TPersistent;
begin
  result := FOwner;
end;

procedure TO32Collection.SetItem(Index : Integer; Value : TO32CollectionItem);
begin
  inherited SetItem(Index, Value);
end;

function TO32Collection.ItemByName(const Name : string) : TO32CollectionItem;
var
  i : Integer;
begin
  for i := 0 to pred(Count) do
    if Item[i].Name = Name then begin
      Result := Item[i];
      exit;
    end;
  Result := nil;
end;

procedure TO32Collection.Loaded;
begin
  InLoaded := True;
  try
    Changed;
  finally
    InLoaded := False;
  end;
  IsLoaded := True;
end;

function TO32Collection.ParentForm : TForm;
var
  Temp : TObject;
begin
  Temp := GetOwner;
  while (Temp <> nil) and not (Temp is TForm) do
    Temp := TComponent(Temp).Owner;
  Result := TForm(Temp);
end;

{End - TO32Collection }

{===== TOvcCollectionStreamer ========================================}
function TOvcCollectionStreamer.CollectionFromType(Component : TComponent) : TOvcCollection;
var
  I : Integer;
begin
  for I := 0 to pred(FCollectionList.Count) do
    if Component is TOvcCollection(FCollectionList[I]).ItemClass then begin
      Result := TOvcCollection(FCollectionList[I]);
      exit;
    end;
  raise Exception.Create(GetOrphStr(SCCollectionNotFound));
end;

constructor TOvcCollectionStreamer.Create(AOwner : TComponent);
begin
  inherited Create;

  FOwner := AOwner;
  FCollectionList := TList.Create;
end;

destructor TOvcCollectionStreamer.Destroy;
begin
  FCollectionList.Free;
  FCollectionList := nil;

  inherited Destroy;
end;

procedure TOvcCollectionStreamer.GetChildren(Proc: TGetChildProc; Root : TComponent);
var
  I,J: Integer;
begin
  for I := 0 to pred(FCollectionList.Count) do
    with TOvcCollection(FCollectionList[I]) do
      if Stored then
        for J := 0 to Count - 1 do
          Proc(Item[J]);
end;

procedure TOvcCollectionStreamer.Loaded;
var
  I : Integer;
begin
  for I := 0 to pred(FCollectionList.Count) do
    TOvcCollection(FCollectionList[I]).Loaded;
end;

function DefaultController : TOvcController;
begin
  if FDefaultController = nil then
    FDefaultController := TOvcController.Create(nil);
  Result := FDefaultController;
end;

initialization
  {register the attached label class}
  if Classes.GetClass(TOvcAttachedLabel.ClassName) = nil then
    Classes.RegisterClass(TOvcAttachedLabel);
{$IFDEF LCL}
  {$I ovcbase.lrs}
{$ENDIF}
finalization
  FDefaultController.Free;
  FDefaultController := nil;
end.