PC Plus SuperCD (UK) 2000 March/pcp161b.iso/full/delphi/INSTALL/data.z/EDITIMP.PAS

Pascal/Delphi Source File | 1997-08-05 | 18.0 KB | 686 lines

unit EditImp;

interface

uses
  Windows, ActiveX, Classes, Controls, Graphics, Menus, Forms, StdCtrls,
  ComServ, StdVCL, AXCtrls, PBag_TLB;

type
  TEditX = class(TActiveXControl, IEditX, IPersistPropertyBag)
  private
    { Private declarations }
    FDelphiControl: TEdit;
    FEvents: IEditXEvents;
    procedure ChangeEvent(Sender: TObject);
    procedure ClickEvent(Sender: TObject);
    procedure DblClickEvent(Sender: TObject);
    procedure KeyPressEvent(Sender: TObject; var Key: Char);
  protected
    { IPersistPropertyBag }
    { Methods should be aliased so they don't collide with existing names }
    function IPersistPropertyBag.InitNew = PersistPropBagInitNew;
    function IPersistPropertyBag.Load = PersistPropBagLoad;
    function IPersistPropertyBag.Save = PersistPropBagSave;
    function PersistPropBagInitNew: HResult; stdcall;
    function PersistPropBagLoad(const pPropBag: IPropertyBag;
      const pErrorLog: IErrorLog): HResult; stdcall;
    function PersistPropBagSave(const pPropBag: IPropertyBag; fClearDirty: BOOL;
      fSaveAllProperties: BOOL): HResult; stdcall;
    { Protected declarations }
    procedure InitializeControl; override;
    procedure EventSinkChanged(const EventSink: IUnknown); override;
    procedure DefinePropertyPages(DefinePropertyPage: TDefinePropertyPage); override;
    function Get_AutoSelect: WordBool; safecall;
    function Get_AutoSize: WordBool; safecall;
    function Get_BorderStyle: TxBorderStyle; safecall;
    function Get_CharCase: TxEditCharCase; safecall;
    function Get_Color: TColor; safecall;
    function Get_Ctl3D: WordBool; safecall;
    function Get_Cursor: Smallint; safecall;
    function Get_DragCursor: Smallint; safecall;
    function Get_DragMode: TxDragMode; safecall;
    function Get_Enabled: WordBool; safecall;
    function Get_Font: Font; safecall;
    function Get_HideSelection: WordBool; safecall;
    function Get_ImeMode: TxImeMode; safecall;
    function Get_ImeName: WideString; safecall;
    function Get_MaxLength: Integer; safecall;
    function Get_Modified: WordBool; safecall;
    function Get_OEMConvert: WordBool; safecall;
    function Get_ParentColor: WordBool; safecall;
    function Get_ParentCtl3D: WordBool; safecall;
    function Get_PasswordChar: Smallint; safecall;
    function Get_ReadOnly: WordBool; safecall;
    function Get_SelLength: Integer; safecall;
    function Get_SelStart: Integer; safecall;
    function Get_SelText: WideString; safecall;
    function Get_Text: WideString; safecall;
    function Get_Visible: WordBool; safecall;
    procedure AboutBox; safecall;
    procedure Clear; safecall;
    procedure ClearSelection; safecall;
    procedure CopyToClipboard; safecall;
    procedure CutToClipboard; safecall;
    procedure PasteFromClipboard; safecall;
    procedure SelectAll; safecall;
    procedure Set_AutoSelect(Value: WordBool); safecall;
    procedure Set_AutoSize(Value: WordBool); safecall;
    procedure Set_BorderStyle(Value: TxBorderStyle); safecall;
    procedure Set_CharCase(Value: TxEditCharCase); safecall;
    procedure Set_Color(Value: TColor); safecall;
    procedure Set_Ctl3D(Value: WordBool); safecall;
    procedure Set_Cursor(Value: Smallint); safecall;
    procedure Set_DragCursor(Value: Smallint); safecall;
    procedure Set_DragMode(Value: TxDragMode); safecall;
    procedure Set_Enabled(Value: WordBool); safecall;
    procedure Set_Font(const Value: Font); safecall;
    procedure Set_HideSelection(Value: WordBool); safecall;
    procedure Set_ImeMode(Value: TxImeMode); safecall;
    procedure Set_ImeName(const Value: WideString); safecall;
    procedure Set_MaxLength(Value: Integer); safecall;
    procedure Set_Modified(Value: WordBool); safecall;
    procedure Set_OEMConvert(Value: WordBool); safecall;
    procedure Set_ParentColor(Value: WordBool); safecall;
    procedure Set_ParentCtl3D(Value: WordBool); safecall;
    procedure Set_PasswordChar(Value: Smallint); safecall;
    procedure Set_ReadOnly(Value: WordBool); safecall;
    procedure Set_SelLength(Value: Integer); safecall;
    procedure Set_SelStart(Value: Integer); safecall;
    procedure Set_SelText(const Value: WideString); safecall;
    procedure Set_Text(const Value: WideString); safecall;
    procedure Set_Visible(Value: WordBool); safecall;
  end;

implementation

uses SysUtils, ComObj, About1;

{ Helper Methods }

const
  DispIDArgs: Longint = DISPID_PROPERTYPUT;

function HandleException: HResult;
var
  E: TObject;
begin
  E := ExceptObject;
  if (E is EOleSysError) and (EOleSysError(E).ErrorCode < 0) then
    Result := EOleSysError(E).ErrorCode else
    Result := E_UNEXPECTED;
end;

{ GetDispatchPropValue returns the value of the property associated with }
{ Disp's DispID. }
function GetDispatchPropValue(Disp: IDispatch; DispID: Integer): OleVariant;
var
  ExcepInfo: TExcepInfo;
  DispParams: TDispParams;
  Status: HResult;
begin
  FillChar(DispParams, SizeOf(DispParams), 0);
  Status := Disp.Invoke(DispID, GUID_NULL, 0, DISPATCH_PROPERTYGET, DispParams,
    @Result, @ExcepInfo, nil);
  if Status <> S_OK then DispatchInvokeError(Status, ExcepInfo);
end;

{ SetDispatchPropValue sets the value of the property associated with }
{ Disp's DispID. }
procedure SetDispatchPropValue(Disp: IDispatch; DispID: Integer;
  const Value: OleVariant);
var
  ExcepInfo: TExcepInfo;
  DispParams: TDispParams;
  Status: HResult;
begin
  with DispParams do
  begin
    rgvarg := @Value;
    rgdispidNamedArgs := @DispIDArgs;
    cArgs := 1;
    cNamedArgs := 1;
  end;
  Status := Disp.Invoke(DispId, GUID_NULL, 0, DISPATCH_PROPERTYPUT, DispParams,
    nil, @ExcepInfo, nil);
  if Status <> S_OK then DispatchInvokeError(Status, ExcepInfo);
end;

{ EnumDispatchProperties fills a TStrings with property names and }
{ dispids for the properties of Dispatch.  You can use PropType and }
{ VTCode to filter for properties of a specific type, or you can pass }
{ GUID_NULL and VT_EMPTY respectively to get all properties. }
procedure EnumDispatchProperties(Dispatch: IDispatch; PropType: TGUID;
  VTCode: Integer; PropList: TStrings);
const
  INVOKE_PROPERTYSET = INVOKE_PROPERTYPUT or INVOKE_PROPERTYPUTREF;
var
  I: Integer;
  TypeInfo: ITypeInfo;
  TypeAttr: PTypeAttr;
  FuncDesc: PFuncDesc;
  VarDesc: PVarDesc;

  procedure SaveName(Id: Integer);
  var
    Name: WideString;
  begin
    OleCheck(TypeInfo.GetDocumentation(Id, @Name, nil, nil, nil));
    if PropList.IndexOfObject(TObject(Id)) = -1 then
      PropList.AddObject(Name, TObject(Id));
  end;

  function IsPropType(const TypeInfo: ITypeInfo; TypeDesc: PTypeDesc): Boolean;
  var
    RefInfo: ITypeInfo;
    RefAttr: PTypeAttr;
    IsNullGuid: Boolean;
  begin
    IsNullGuid := IsEqualGuid(PropType, GUID_NULL);
    Result := IsNullGuid and (VTCode = VT_EMPTY);
    if Result then Exit;
    case TypeDesc.vt of
      VT_PTR: Result := IsPropType(TypeInfo, TypeDesc.ptdesc);
      VT_USERDEFINED:
        begin
          OleCheck(TypeInfo.GetRefTypeInfo(TypeDesc.hreftype, RefInfo));
          OleCheck(RefInfo.GetTypeAttr(RefAttr));
          try
            Result := IsEqualGUID(RefAttr.guid, PropType);
            if not Result and (RefAttr.typekind = TKIND_ALIAS) then
              Result := IsPropType(RefInfo, @RefAttr.tdescAlias);
          finally
            RefInfo.ReleaseTypeAttr(RefAttr);
          end;
        end;
    else
      Result := IsNullGuid and (TypeDesc.vt = VTCode);
    end;
  end;

  function HasMember(const TypeInfo: ITypeInfo; Cnt, MemID, InvKind: Integer): Boolean;
  var
    I: Integer;
    FuncDesc: PFuncDesc;
  begin
    for I := 0 to Cnt - 1 do
    begin
      OleCheck(TypeInfo.GetFuncDesc(I, FuncDesc));
      try
        if (FuncDesc.memid = MemID) and (FuncDesc.invkind and InvKind <> 0) then
        begin
          Result := True;
          Exit;
        end;
      finally
        TypeInfo.ReleaseFuncDesc(FuncDesc);
      end;
    end;
    Result := False;
  end;

begin
  OleCheck(Dispatch.GetTypeInfo(0,0,TypeInfo));
  if TypeInfo = nil then Exit;
  OleCheck(TypeInfo.GetTypeAttr(TypeAttr));
  try
    for I := 0 to TypeAttr.cVars - 1 do
    begin
      OleCheck(TypeInfo.GetVarDesc(I, VarDesc));
      try
        if (VarDesc.wVarFlags and VARFLAG_FREADONLY <> 0) and
          IsPropType(TypeInfo, @VarDesc.elemdescVar.tdesc) then
          SaveName(VarDesc.memid);
      finally
        TypeInfo.ReleaseVarDesc(VarDesc);
      end;
    end;
    for I := 0 to TypeAttr.cFuncs - 1 do
    begin
      OleCheck(TypeInfo.GetFuncDesc(I, FuncDesc));
      try
        if ((FuncDesc.invkind = INVOKE_PROPERTYGET) and
          HasMember(TypeInfo, TypeAttr.cFuncs, FuncDesc.memid, INVOKE_PROPERTYSET) and
          IsPropType(TypeInfo, @FuncDesc.elemdescFunc.tdesc)) or
          ((FuncDesc.invkind and INVOKE_PROPERTYSET <> 0) and
          HasMember(TypeInfo, TypeAttr.cFuncs, FuncDesc.memid, INVOKE_PROPERTYGET) and
          IsPropType(TypeInfo,
            @FuncDesc.lprgelemdescParam[FuncDesc.cParams - 1].tdesc)) then
            SaveName(FuncDesc.memid);
      finally
        TypeInfo.ReleaseFuncDesc(FuncDesc);
      end;
    end;
  finally
    TypeInfo.ReleaseTypeAttr(TypeAttr);
  end;
end;

{ TEditX }

{ TEditX.IPersistPropertyBag }

function TEditX.PersistPropBagInitNew: HResult;
begin
  // NOTE: A return value of E_NOTIMPL is not allowed.  You must return S_OK
  // even if this method does nothing.
  Result := S_OK;
end;

function TEditX.PersistPropBagLoad(const pPropBag: IPropertyBag;
  const pErrorLog: IErrorLog): HResult;
var
  PropList: TStringList;
  i: Integer;
  WPropName: WideString;
  PropValue: OleVariant;
begin
  try
    if pPropBag = nil then
    begin
      Result := E_POINTER;
      Exit;
    end;
    Result := S_OK;
    PropList := TStringList.Create;
    try
      EnumDispatchProperties(Self as IDispatch, GUID_NULL, VT_EMPTY, PropList);
      for i := 0 to PropList.Count - 1 do
      begin
        WPropName := PropList[i];
        if pPropBag.Read(PWideChar(WPropName), PropValue, pErrorLog) = S_OK then
          SetDispatchPropValue(Self as IDispatch, Integer(PropList.Objects[i]),
            PropValue);
      end;
    finally
      PropList.Free;
    end;
  except
    Result := HandleException;
  end;
end;

function TEditX.PersistPropBagSave(const pPropBag: IPropertyBag;
  fClearDirty: BOOL; fSaveAllProperties: BOOL): HResult;
var
  PropList: TStringList;
  i: Integer;
  WPropName: WideString;
begin
  try
    if pPropBag = nil then
    begin
      Result := E_POINTER;
      Exit;
    end;
    Result := S_OK;
    PropList := TStringList.Create;
    try
      EnumDispatchProperties(Self as IDispatch, GUID_NULL, VT_EMPTY, PropList);
      for i := 0 to PropList.Count - 1 do
      begin
        WPropName := PropList[i];
        pPropBag.Write(PWideChar(WPropName),
          GetDispatchPropValue(Self as IDispatch, Integer(PropList.Objects[i])));
      end;
    finally
      PropList.Free;
    end;
  except
    Result := HandleException;
  end;
end;

{ TEditX Delphi-generated methods }

procedure TEditX.InitializeControl;
begin
  FDelphiControl := Control as TEdit;
  FDelphiControl.OnChange := ChangeEvent;
  FDelphiControl.OnClick := ClickEvent;
  FDelphiControl.OnDblClick := DblClickEvent;
  FDelphiControl.OnKeyPress := KeyPressEvent;
end;

procedure TEditX.EventSinkChanged(const EventSink: IUnknown);
begin
  FEvents := EventSink as IEditXEvents;
end;

procedure TEditX.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_EditXPage); }
end;

function TEditX.Get_AutoSelect: WordBool;
begin
  Result := FDelphiControl.AutoSelect;
end;

function TEditX.Get_AutoSize: WordBool;
begin
  Result := FDelphiControl.AutoSize;
end;

function TEditX.Get_BorderStyle: TxBorderStyle;
begin
  Result := Ord(FDelphiControl.BorderStyle);
end;

function TEditX.Get_CharCase: TxEditCharCase;
begin
  Result := Ord(FDelphiControl.CharCase);
end;

function TEditX.Get_Color: TColor;
begin
  Result := FDelphiControl.Color;
end;

function TEditX.Get_Ctl3D: WordBool;
begin
  Result := FDelphiControl.Ctl3D;
end;

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

function TEditX.Get_DragCursor: Smallint;
begin
  Result := Smallint(FDelphiControl.DragCursor);
end;

function TEditX.Get_DragMode: TxDragMode;
begin
  Result := Ord(FDelphiControl.DragMode);
end;

function TEditX.Get_Enabled: WordBool;
begin
  Result := FDelphiControl.Enabled;
end;

function TEditX.Get_Font: Font;
begin
  GetOleFont(FDelphiControl.Font, Result);
end;

function TEditX.Get_HideSelection: WordBool;
begin
  Result := FDelphiControl.HideSelection;
end;

function TEditX.Get_ImeMode: TxImeMode;
begin
  Result := Ord(FDelphiControl.ImeMode);
end;

function TEditX.Get_ImeName: WideString;
begin
  Result := WideString(FDelphiControl.ImeName);
end;

function TEditX.Get_MaxLength: Integer;
begin
  Result := FDelphiControl.MaxLength;
end;

function TEditX.Get_Modified: WordBool;
begin
  Result := FDelphiControl.Modified;
end;

function TEditX.Get_OEMConvert: WordBool;
begin
  Result := FDelphiControl.OEMConvert;
end;

function TEditX.Get_ParentColor: WordBool;
begin
  Result := FDelphiControl.ParentColor;
end;

function TEditX.Get_ParentCtl3D: WordBool;
begin
  Result := FDelphiControl.ParentCtl3D;
end;

function TEditX.Get_PasswordChar: Smallint;
begin
  Result := Smallint(FDelphiControl.PasswordChar);
end;

function TEditX.Get_ReadOnly: WordBool;
begin
  Result := FDelphiControl.ReadOnly;
end;

function TEditX.Get_SelLength: Integer;
begin
  Result := FDelphiControl.SelLength;
end;

function TEditX.Get_SelStart: Integer;
begin
  Result := FDelphiControl.SelStart;
end;

function TEditX.Get_SelText: WideString;
begin
  Result := WideString(FDelphiControl.SelText);
end;

function TEditX.Get_Text: WideString;
begin
  Result := WideString(FDelphiControl.Text);
end;

function TEditX.Get_Visible: WordBool;
begin
  Result := FDelphiControl.Visible;
end;

procedure TEditX.AboutBox;
begin
  ShowEditXAbout;
end;

procedure TEditX.Clear;
begin

end;

procedure TEditX.ClearSelection;
begin

end;

procedure TEditX.CopyToClipboard;
begin

end;

procedure TEditX.CutToClipboard;
begin

end;

procedure TEditX.PasteFromClipboard;
begin

end;

procedure TEditX.SelectAll;
begin

end;

procedure TEditX.Set_AutoSelect(Value: WordBool);
begin
  FDelphiControl.AutoSelect := Value;
end;

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

procedure TEditX.Set_BorderStyle(Value: TxBorderStyle);
begin
  FDelphiControl.BorderStyle := TBorderStyle(Value);
end;

procedure TEditX.Set_CharCase(Value: TxEditCharCase);
begin
  FDelphiControl.CharCase := TEditCharCase(Value);
end;

procedure TEditX.Set_Color(Value: TColor);
begin
  FDelphiControl.Color := Value;
end;

procedure TEditX.Set_Ctl3D(Value: WordBool);
begin
  FDelphiControl.Ctl3D := Value;
end;

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

procedure TEditX.Set_DragCursor(Value: Smallint);
begin
  FDelphiControl.DragCursor := TCursor(Value);
end;

procedure TEditX.Set_DragMode(Value: TxDragMode);
begin
  FDelphiControl.DragMode := TDragMode(Value);
end;

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

procedure TEditX.Set_Font(const Value: Font);
begin
  SetOleFont(FDelphiControl.Font, Value);
end;

procedure TEditX.Set_HideSelection(Value: WordBool);
begin
  FDelphiControl.HideSelection := Value;
end;

procedure TEditX.Set_ImeMode(Value: TxImeMode);
begin
  FDelphiControl.ImeMode := TImeMode(Value);
end;

procedure TEditX.Set_ImeName(const Value: WideString);
begin
  FDelphiControl.ImeName := TImeName(Value);
end;

procedure TEditX.Set_MaxLength(Value: Integer);
begin
  FDelphiControl.MaxLength := Value;
end;

procedure TEditX.Set_Modified(Value: WordBool);
begin
  FDelphiControl.Modified := Value;
end;

procedure TEditX.Set_OEMConvert(Value: WordBool);
begin
  FDelphiControl.OEMConvert := Value;
end;

procedure TEditX.Set_ParentColor(Value: WordBool);
begin
  FDelphiControl.ParentColor := Value;
end;

procedure TEditX.Set_ParentCtl3D(Value: WordBool);
begin
  FDelphiControl.ParentCtl3D := Value;
end;

procedure TEditX.Set_PasswordChar(Value: Smallint);
begin
  FDelphiControl.PasswordChar := Char(Value);
end;

procedure TEditX.Set_ReadOnly(Value: WordBool);
begin
  FDelphiControl.ReadOnly := Value;
end;

procedure TEditX.Set_SelLength(Value: Integer);
begin
  FDelphiControl.SelLength := Value;
end;

procedure TEditX.Set_SelStart(Value: Integer);
begin
  FDelphiControl.SelStart := Value;
end;

procedure TEditX.Set_SelText(const Value: WideString);
begin
  FDelphiControl.SelText := String(Value);
end;

procedure TEditX.Set_Text(const Value: WideString);
begin
  FDelphiControl.Text := TCaption(Value);
end;

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

procedure TEditX.ChangeEvent(Sender: TObject);
begin
  if FEvents <> nil then FEvents.OnChange;
end;

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

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

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

initialization
  TActiveXControlFactory.Create(
    ComServer,
    TEditX,
    TEdit,
    Class_EditX,
    1,
    '',
    0);
end.