private void InstalledAddonDataGrid_OnPreviewMouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton != MouseButtonState.Pressed)
{
return;
}
var position = e.GetPosition(null);
if (!(Math.Abs(position.X - _prevMousePoint.X) > SystemParameters.MinimumHorizontalDragDistance) &&
!(Math.Abs(position.Y - _prevMousePoint.Y) > SystemParameters.MinimumVerticalDragDistance))
{
return;
}
_prevRowIndex = Grid.GetDataGridItemCurrentRowIndex(e.GetPosition);
if (_prevRowIndex < 0)
{
return;
}
if (e.IsColumnSelected())
{
return;
}
Grid.SelectedIndex = _prevRowIndex;
var selectedAddon = Grid.Items[_prevRowIndex] as InstalledAddonDataGridItem;
if (selectedAddon == null)
{
return;
}
const DragDropEffects dragDropEffects = DragDropEffects.Move;
if (DragDrop.DoDragDrop(Grid, selectedAddon, dragDropEffects) != DragDropEffects.None)
{
Grid.SelectedItem = selectedAddon;
}
}