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{%MainUnit ../dbctrls.pp}
{******************************************************************************
TDBText
data aware label, base found in dbctrls.pp
******************************************************************************
*****************************************************************************
This file is part of the Lazarus Component Library (LCL)
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
}
// included by dbctrls.pp
{ Private Methods}
//update the caption on next record etc...
procedure TDBText.DataChange(Sender: TObject);
begin
if FDataLink.Field <> nil then
Caption := FDataLink.Field.DisplayText
// This designing check avoids getting a 1x1 control in design mode,
// see http://bugs.freepascal.org/view.php?id=19021
else if csDesigning in ComponentState then
Caption := Name
else
Caption := '';
end;
function TDBText.GetDataField: string;
begin
Result := FDataLink.FieldName;
end;
function TDBText.GetDataSource: TDataSource;
begin
Result := FDataLink.DataSource;
end;
function TDBText.GetField: TField;
begin
Result := FDataLink.Field;
end;
procedure TDBText.SetDataField(const Value: string);
begin
FDataLink.FieldName := Value;
end;
procedure TDBText.SetDataSource(Value: TDataSource);
begin
ChangeDataSource(Self,FDataLink,Value);
end;
procedure TDBText.CMGetDataLink(var Message: TLMessage);
begin
Message.Result := PtrUInt(FDataLink);
end;
procedure TDBText.Notification(AComponent: TComponent; Operation: TOperation);
begin
inherited Notification(AComponent, Operation);
// if the datasource is being removed then we need to make sure
// we are updated or we can get AV/Seg's *cough* as I foolishly
// discovered firsthand....
if (Operation=opRemove) then begin
if (FDataLink<>nil) and (AComponent=DataSource) then
DataSource:=nil;
end;
end;
class procedure TDBText.WSRegisterClass;
const
Done: Boolean = False;
begin
if Done then
Exit;
inherited WSRegisterClass;
RegisterPropertyToSkip(TDBText, 'Caption', 'Removed in 0.9.29. DB control should not save/load their data from stream.', '');
Done := True;
end;
procedure TDBText.Loaded;
begin
inherited Loaded;
if csDesigning in ComponentState then
Caption := Name
end;
{ Public Methods}
constructor TDBText.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FDataLink := TFieldDataLink.Create;
FDataLink.Control := Self;
FDataLink.OnDataChange := @DataChange;
end;
destructor TDBText.Destroy;
begin
FDataLink.Free;
inherited Destroy;
end;
function TDBText.ExecuteAction(AAction: TBasicAction): Boolean;
begin
Result := inherited ExecuteAction(AAction) or
(FDataLink <> nil) and FDataLink.ExecuteAction(AAction);
end;
function TDBText.UpdateAction(AAction: TBasicAction): Boolean;
begin
Result := inherited UpdateAction(AAction) or
(FDataLink <> nil) and FDataLink.UpdateAction(AAction);
end;
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