jvdbeditors.pas

East make Tray Icon in delphi

{-----------------------------------------------------------------------------
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/MPL-1.1.html

Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either expressed or implied. See the License for
the specific language governing rights and limitations under the License.

The Original Code is: JvDBEditors.PAS, released on 2002-05-26.

The Initial Developer of the Original Code is John Doe.
Portions created by John Doe are Copyright (C) 2003 John Doe.
All Rights Reserved.

Contributor(s):

You may retrieve the latest version of this file at the Project JEDI's JVCL home page,
located at http://jvcl.sourceforge.net

Known Issues:
-----------------------------------------------------------------------------}
// $Id: JvDBEditors.pas,v 1.6 2004/07/22 07:36:34 marquardt Exp $

unit JvDBEditors;

{$I jvcl.inc}

interface

uses
  Classes,
  {$IFDEF COMPILER6_UP}
  DesignIntf, DesignEditors, VCLEditors;
  {$ELSE}
  DsgnIntf;
  {$ENDIF COMPILER6_UP}

type
  {**************** from Delphi2\Lib\DBReg.pas }
  TJvDBStringProperty  = class(TStringProperty)
  public
    function GetAttributes: TPropertyAttributes; override;
    procedure GetValueList(List: TStrings); virtual; abstract;
    procedure GetValues(Proc: TGetStrProc); override;
  end;

  TJvDataFieldProperty = class(TJvDBStringProperty)
  public
    function GetDataSourcePropName: string; virtual;
    procedure GetValueList(List: TStrings); override;
  end;

  TJvListFieldProperty = class(TJvDataFieldProperty)
  public
    function GetDataSourcePropName: string; override;
  end;

  { For TJvDBLookupList, TJvDBLookupCombo components }
  TJvLookupSourceProperty = class(TJvDBStringProperty)
  public
    procedure GetValueList(List: TStrings); override;
    function GetDataSourcePropName: string; virtual;
  end;


implementation

uses
  DB, TypInfo;

//=== { TJvDBStringProperty } ================================================

function TJvDBStringProperty.GetAttributes: TPropertyAttributes;
begin
  Result := [paValueList, paSortList, paMultiSelect];
end;

procedure TJvDBStringProperty.GetValues(Proc: TGetStrProc);
var
  I: Integer;
  Values: TStringList;
begin
  Values := TStringList.Create;
  try
    GetValueList(Values);
    for I := 0 to Values.Count - 1 do
      Proc(Values[I]);
  finally
    Values.Free;
  end;
end;

//=== { TJvDataFieldProperty } ===============================================

function TJvDataFieldProperty.GetDataSourcePropName: string;
begin
  Result := 'DataSource';
end;

procedure TJvDataFieldProperty.GetValueList(List: TStrings);
var
  Instance: TComponent;
  PropInfo: PPropInfo;
  DataSource: TDataSource;
begin
  Instance := TComponent(GetComponent(0));
  PropInfo := TypInfo.GetPropInfo(Instance.ClassInfo, GetDataSourcePropName);
  if (PropInfo <> nil) and (PropInfo^.PropType^.Kind = tkClass) then
  begin
    DataSource := TObject(GetOrdProp(Instance, PropInfo)) as TDataSource;
    if (DataSource <> nil) and (DataSource.DataSet <> nil) then
      DataSource.DataSet.GetFieldNames(List);
  end;
end;

//=== { TJvListFieldProperty } ===============================================

function TJvListFieldProperty.GetDataSourcePropName: string;
begin
  Result := 'ListSource';
end;

//=== { TJvLookupSourceProperty } ===================================================

function TJvLookupSourceProperty.GetDataSourcePropName: string;
begin
  Result := 'LookupSource';
end;

procedure TJvLookupSourceProperty.GetValueList(List: TStrings);
var
  Instance: TComponent;
  PropInfo: PPropInfo;
  DataSource: TDataSource;
begin
  Instance := TComponent(GetComponent(0));
  PropInfo := TypInfo.GetPropInfo(Instance.ClassInfo, GetDataSourcePropName);
  if (PropInfo <> nil) and (PropInfo^.PropType^.Kind = tkClass) then
  begin
    DataSource := TObject(GetOrdProp(Instance, PropInfo)) as TDataSource;
    if (DataSource <> nil) and (DataSource.DataSet <> nil) then
      DataSource.DataSet.GetFieldNames(List);
  end;
end;

end.