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Bug in TTMSFMXTableView with BufferSize > 0 and SelectedItemIndex to 0

FMX TMS FMX UI Pack
#1

Hello, I have a simple form with a TTMSFMXTableView ( TableView1 ) and a TButton ( ButtonAddItem ), the TableView is filled in the OnCreate event of the form. After the form is shown, if I press the ButtonAddItem, a item is added to the TableView, but this item is not shown in the tableview. If I set the TableView BufferSize to 0 the application works, but if I leave it to its default value of 50, It does not work. For reproduce the bug, It is necesary to have the SelectedItemIndex to 0 for example.

I am using the lastest version of FMX UI Pack, 3.7.5.7 and Delphi 10.2 update 3.

I have attached to this topic the source code to reproduce the problem.

tmsfmxuitableview.zip (60.1 KB)

Thank you.

#2

Hi,

Once the first set of items are added, the buffer is set to the maximum number of items. So you have two choices. Either use the approach of setting a BufferSize of 0, which will then use all the items in the collection or reset the buffer with TMSFMXTableView1.LoadBufferBetween(-1, -1);

procedure TForm1.ButtonAddItemClick(Sender: TObject);
var
  Item : TTMSFMXTableViewItem;
  I : Integer;
begin
  TableView1.BeginUpdate;
  try
    TableView1.LoadBufferBetween(-1, -1);
    Item := TableView1.Items.Add;
    I := TableView1.Items.Count - 1;
    Item.Caption := 'Caption of item ' + IntToStr( I );
    Item.Description := 'Description of item ' + IntToStr( I );
    Item.Tag := I;
  finally
    TableView1.EndUpdate;
  end;
end;
#3

Hello,

If this is the normal behaviour, you should to update the manual documentation doing reference to this issue. I do not understand why this is not done automatically by the component if you know that the problem exists.

Thank you.

#4

We'll see if we can integrate this into the component instead.

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