How does row numbering in a QStandardItemModel work

voidtrance

I am having some difficulty understanding how row numbering in QStandardItemModel() works. For example: I have a model which has two rows of 5 columns each. I want to remove the rows from the model without losing the actual data. Let's say that the row indexes are 0 and 1.

I am using PyQt4 so I can't paste C++ code here but the code does the following:

for index in 1, 0:
    rowData = model->takeRow(index)

The reason for the inverted sequence is that, as far as I understand it, when a row is removed with takeRow(), the remaining rows are re-numbered. So the logic here is, take rows away from the end.

However, the above only results in a single list of QStandradItems(). The second list is empty. Can someone explain this to me, please?

SGaist

Hi,

What do you mean by the second list is empty ?

voidtrance

@SGaist said:

Hi,

What do you mean by the second list is empty ?

takeRow() returns a QList (in PyQt4, it is just a standard Python list) of QStandardItems(). If you execute the loop for 2 iterations, you should get two lists (one for each row). On the first iteration, I get the items from the second row. However, on the second iteration, the return value is an empty list.

SGaist

What do you have if you use something like:

while model.rowCount():
    rowData = model.takeRow(mode.rowCount() -1)
    print rowData