{%MainUnit ../dbctrls.pas}
{
 *****************************************************************************
 *                                                                           *
 *  This file is part of the Lazarus Component Library (LCL)                 *
 *                                                                           *
 *  See the file COPYING.LCL, included in this distribution,                 *
 *  for details about the copyright.                                         *
 *                                                                           *
 *  This program is distributed in the hope that it will be useful,          *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of           *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                     *
 *                                                                           *
 *****************************************************************************
}

{ TDBMemo }

function TDBMemo.GetDataField: string;
begin
  Result:=FDataLink.FieldName;
end;

function TDBMemo.GetDataSource: TDataSource;
begin
  Result:=FDataLink.DataSource;
end;

function TDBMemo.GetField: TField;
begin
  Result:=FDataLink.Field;
end;

function TDBMemo.GetReadOnly: Boolean;
begin
  Result:=FDataLink.ReadOnly;
end;

procedure TDBMemo.SetAutoDisplay(const AValue: Boolean);
begin
  if FAutoDisplay=AValue then exit;
  FAutoDisplay:=AValue;
  if FAutoDisplay then LoadMemo;
end;

procedure TDBMemo.SetDataField(const AValue: string);
begin
  FDataLink.FieldName:=AValue;
end;

procedure TDBMemo.SetDataSource(const AValue: TDataSource);
begin
  if not (FDataLink.DataSourceFixed and (csLoading in ComponentState)) then
    FDataLink.DataSource:=AValue;
  if AValue<>nil then
    AValue.FreeNotification(Self);
end;

procedure TDBMemo.SetReadOnly(const AValue: Boolean);
begin
  FDataLink.ReadOnly:=AValue;
end;

function TDBMemo.WordWrapIsStored: boolean;
begin
  Result:=not WordWrap;
end;

procedure TDBMemo.DataChange(Sender: TObject);
begin
  if FDataLink.Field<>nil then begin
    if FDataLink.Field.IsBlob then begin
      if FAutoDisplay or (FDataLink.Editing and FDBMemoLoaded) then begin
        FDBMemoLoaded:=False;
        LoadMemo;
      end else begin
        Text:=Format('(%s)', [FDataLink.Field.DisplayLabel]);
        FDBMemoLoaded:=False;
      end;
    end else begin
      if FDBMemoFocused and FDataLink.CanModify then
        Text:=FDataLink.Field.Text
      else
        Text:=FDataLink.Field.DisplayText;
      FDBMemoLoaded:=True;
    end
  end else begin
    if csDesigning in ComponentState then
      Text:=Name
    else
      Text:='';
    FDBMemoLoaded:=False;
  end;
end;

procedure TDBMemo.EditingChange(Sender: TObject);
begin
  inherited ReadOnly:=not (FDataLink.Editing and FDBMemoLoaded);
end;

procedure TDBMemo.Notification(AComponent: TComponent; Operation: TOperation);
begin
  inherited Notification(AComponent, Operation);
  if (Operation=opRemove) then begin
    if (FDataLink<>nil) and (AComponent=DataSource) then
      DataSource:=nil;
  end;
end;

procedure TDBMemo.UpdateData(Sender: TObject);
begin
  FDataLink.Field.AsString:=Text;
end;

constructor TDBMemo.Create(TheOwner: TComponent);
begin
  inherited Create(TheOwner);
  ControlStyle:=ControlStyle+[csReplicatable];
  FAutoDisplay:=True;
  FDataLink:=TFieldDataLink.Create;
  FDataLink.Control:=Self;
  FDataLink.OnDataChange:=@DataChange;
  FDataLink.OnEditingChange:=@EditingChange;
  FDataLink.OnUpdateData:=@UpdateData;
  inherited ReadOnly:=True;
end;

procedure TDBMemo.FocusRequest(Sender: TObject);
begin
  //the FieldLink has requested the control
  //recieve focus for some reason..
  //perhaps an error occured?
  SetFocus;
end;

procedure TDBMemo.Loaded;
begin
  inherited Loaded;
  if (csDesigning in ComponentState) then
    DataChange(Self);
end;

procedure TDBMemo.EditingDone;
begin
  FDataLink.UpdateRecord;
  inherited EditingDone;
end;

destructor TDBMemo.Destroy;
begin
  FDataLink.Free;
  FDataLink:=nil;
  inherited Destroy;
end;

procedure TDBMemo.LoadMemo;
begin
  if not FDBMemoLoaded and (FDataLink.Field<>nil)
  and FDataLink.Field.IsBlob then begin
    try
      Lines.Text:=FDataLink.Field.AsString;
      FDBMemoLoaded:=True;
    except
      on E:EInvalidOperation do
        Lines.Text:='('+E.Message+')';
    end;
    EditingChange(Self);
  end;
end;

// included by dbctrls.pas