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建議將屬性編輯器代碼放在帶有 Editor 后綴的單獨(dú)文件中。在我們的例子中，有必要為TfrxIBXDatabase.DatabaseName、TfrxIBXTable.IndexName、TfrxIBXTable.TableName屬性編寫編輯器。請(qǐng)參閱相應(yīng)章節(jié)中有關(guān)編寫屬性編輯器的更多信息。以下是此類文件的示例：

unit frxIBXEditor;

interface
{$I frx.inc}

implementation

uses
  Windows, Classes, SysUtils, Forms, Dialogs, frxIBXComponents, frxCustomDB,
  frxDsgnIntf, frxRes, IBDatabase, IBTable
{$IFDEF Delphi6}
, Variants
{$ENDIF};

type
  TfrxDatabaseNameProperty = class(TfrxStringProperty)
  public
    function GetAttributes: TfrxPropertyAttributes; override;
    function Edit: Boolean; override;
  end;

  TfrxTableNameProperty = class(TfrxStringProperty)
  public
    function GetAttributes: TfrxPropertyAttributes; override;
    procedure GetValues; override;
  end;

  TfrxIndexNameProperty = class(TfrxStringProperty)
  public
    function GetAttributes: TfrxPropertyAttributes; override;
    procedure GetValues; override;
  end;

{ TfrxDatabaseNameProperty }
function TfrxDatabaseNameProperty.GetAttributes: TfrxPropertyAttributes;
begin
  { this property possesses  editor }
  Result := [paDialog];
end;

function TfrxDatabaseNameProperty.Edit: Boolean;
var
  SaveConnected: Bool;
  db: TIBDatabase;
begin
  { get link to TfrxIBXDatabase.Database }
  db := TfrxIBXDatabase(Component).Database;
  { create standard OpenDialog }
  with TOpenDialog.Create(nil) do
  begin
    InitialDir := GetCurrentDir;
    { we are interested in *.gdb files }
    Filter := frxResources.Get('ftDB') + ' (*.gdb)|*.gdb|' + frxResources.Get('ftAllFiles') + ' (*.*)|*.*';
    Result := Execute;
    if Result then
    begin
      SaveConnected := db.Connected;
      db.Connected := False;
      { if dialogue is completed successfully, assign new DB name }
      db.DatabaseName := FileName;
      db.Connected := SaveConnected;
    end;
    Free;
  end;
end;

{ TfrxTableNameProperty }
function TfrxTableNameProperty.GetAttributes: TfrxPropertyAttributes;
begin
  {  property represents list of values }
  Result := [paMultiSelect, paValueList];
end;

procedure TfrxTableNameProperty.GetValues;
var
  t: TIBTable;
begin
  inherited;
  { get link to  TIBTable  component }
  t := TfrxIBXTable(Component).Table;
  { fill list of tables available }
  if t.Database <> nil then
    t.DataBase.GetTableNames(Values, False);
end;

{ TfrxIndexProperty }
function TfrxIndexNameProperty.GetAttributes: TfrxPropertyAttributes;
begin
  {  property represents list of values }
  Result := [paMultiSelect, paValueList];
end;

procedure TfrxIndexNameProperty.GetValues;
var
  i: Integer;
begin
  inherited;
  try
    { get link to TIBTable component }
    with TfrxIBXTable(Component).Table do
      if (TableName <> '') and (IndexDefs <> nil) then
      begin
        { update indexes }
        IndexDefs.Update;
        { fill list of indexes available }
        for i := 0 to IndexDefs.Count - 1 do
          if IndexDefs[i].Name <> '' then
            Values.Add(IndexDefs[i].Name);
      end;
  except
  end;
end;

initialization
  frxPropertyEditors.Register(TypeInfo(String), TfrxIBXDataBase, 'DatabaseName', TfrxDataBaseNameProperty);
  frxPropertyEditors.Register(TypeInfo(String), TfrxIBXTable, 'TableName', TfrxTableNameProperty);
  frxPropertyEditors.Register(TypeInfo(String), TfrxIBXTable, 'IndexName', TfrxIndexNameProperty);
end.

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