Error ListView (ListView1UpdateObjects), to show or hide item. (Delphi firemonkey)

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If someone can help me, I have a problem with a method of ListView , the method is TForm13.ListView1UpdateObjects in it I do the following: I check the value of an item to decide whether to show an item and concatenate the item to display.

Follow the code: 

    procedure TForm13.ListView1UpdateObjects(const Sender: TObject;
  const AItem: TListViewItem);

var
   ItemText_parcelar_cartao : TListItemText;
   ItemText_valor_parc : TListItemText;
   ItemText_quant_parc : TListItemText;
   concat : TListItemText;
begin


    ItemText_parcelar_cartao := AItem.Objects.FindObject('Text_parcelar_cartao') as TListItemText;
    ItemText_valor_parc := AItem.Objects.FindObject('Text_valor_parcela') as TListItemText;
    ItemText_quant_parc := AItem.Objects.FindObject('Text_quant_parcela') as TListItemText;
    concat := AItem.Objects.FindObject('Text_concat') as TListItemText;




    if ItemText_parcelar_cartao.text = 'sim' then
    begin

       concat.visible := true;
       concat.text := 'ou ' + ItemText_quant_parc.text + 'x de ' + ItemText_valor_parc.text;

    end
    else
       concat.visible := false;

end;

The problem is this: this ListView is connected to a FDMemTable principal, when I load FDMemTable with the data initially, everything works fine, and in another step I add more records to FDMemTable principal coming from an auxiliary% wizard, with the following function: 

FDMemTable_produto_por_desc.AppendData(FDMemTable_produto_por_desc_pagina.Data, true);

When I add the new records, the FDMemTable function is executed, and it is at that moment that the error occurs, the variable TForm13.ListView1UpdateObjects is empty and does not receive the value of the ItemText_parcelar_cartao.text field, and consequently it does not tests and does not concatenate correctly.

    
asked by anonymous 14.08.2018 / 22:38

1 answer

0

Hello. Try this way to get the value. 

var
  item: TListItemText;

begin
  item := AItem.Objects.FindObjectT<TListItemText>('Text_parcelar_cartao');

end;
    
04.09.2018 / 02:19
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