QListWidget - Keep track of moved rows

[hbatalha]

I have a class that inherits from QListWidget that has method connected to QAbstractItemModel::rowsMoved signal.

When I move the rows I need to track their new positions.

void PlaylistPage::onRowsMoved(const QModelIndex &, int start, int end, const QModelIndex &, int row)
{
        
}

Let's say the table has 9 rows and I move the rows 1,2,3 to position 6 and I want to know where the row in position 2 will be when rows are dropped. The rows are moved through drag and drop.

[JonB]

@hbatalha
So 2 will end up being new 5?

[hbatalha]

@JonB it will be 4.

[JonB]

@hbatalha
Upon reflection you are quite right! I was mentally placing them after 6, but of course they get inserted at 6 to come before:

4
5
1
2
3
6
...

[hbatalha]

@JonB So I came up with a solution. I use a variable to store the difference between the position of the row I want to keep track and the last row position out of the selected rows.

//mRowsDifference - holds the position of the row I want to keep track of

void PlaylistPage::onRowsMoved(const QModelIndex &, int start, int end, const QModelIndex &, int row)
{    
     mCurrentPlayingIndex = this->selectedIndexes().last().row() - mRowsDifference;  // after the last row is moved mCurrentPlayingIndex will be holding the new position
}

void PlaylistPage::dragMoveEvent(QDragMoveEvent *event)
{
     mRowsDifference = this->selectedIndexes().last().row() - mCurrentPlayingIndex;
        
     QListWidget::dragMoveEvent(event);
}

I will be making more tests but until it seems to be working