rvico TRichView Reference | TDBRichViewEdit

Example: Inserting controls what can modify themselves in DBRichViewEdit

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This example shows how to work with TEdit inserted in TDBRichViewEdit, if you want to store its text in RVF field.

The problem: when user changes text in TEdit, the dataset is not informed that the document is changed, and these changes are not saved.

In this example, we use DBRichViewEdit1:TDBRichViewEdit placed on Form1.

1) Add in the private section of Form1:

procedure EditChange(Sender: TObject);

Implementation:

procedure TForm1.EditChange(Sender: TObject);

begin

  if DBRichViewEdit1.CanChange then

    DBRichViewEdit1.Change

  else

    Beep;

end;

2) When creating a new TEdit, assign its OnChange event:

var Edit: TEdit;

begin

  Edit := TEdit.Create(nil);

  Edit.OnChange := EditChange;

  DBRichViewEdit1.InsertControl('', Edit, rvvaBaseline);

end;

3) You'll need to assign this event to all edits loaded from the database field with RichView documents. Use OnControlAction of DBRichViewEdit:

procedure TForm1.DBRichViewEdit1ControlAction(Sender: TCustomRichView;

  ControlAction: TRVControlAction; ItemNo: Integer; var ctrl: TControl);

begin

  if (ControlAction=rvcaAfterRVFLoad) and (ctrl is TEdit) then

    TEdit(ctrl).OnChange := EditChange;

end;

And of course, do not forget to register TEdit in the initialization section of unit:

initialization

  RegisterClasses([TEdit]);


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