Rearrange Thumbnail

May I know is there anyway we could let the user drag and drop to rearrange the thumbnail?

Please advice.

Thanks in advance.

Hi,

May I know which event will be fired when the user "dragtomove"?

Please advice.

Regarding to the first question - all standart drag-n-drop events will be fired (DragOver, DragEnter, DragDrop).

As for Insert(...) method - there is no obligatory correspondence between index in the ThumbnailListView.Items collection and visual order. Here is method which inserts item into the control and updates thumbnails visual order.

private void InsertItemToIndex(IListItem item, int index)
{
    if (index < 0 || index > _thumbList.Items.Count)
        throw new ArgumentOutOfRangeException("index");

    _thumbList.Items.Add(item);
    if (index < _thumbList.Items.Count)
    {
        int[] indexes = new int[_thumbList.Items.Count - index - 1];
        for (int k = index, i = 0; k < _thumbList.Items.Count - 1; k++)
               indexes[i++] = k;

       _thumbList.Items.Swap(indexes, _thumbList.Items.Count);
    }
}

As for internal array: the best way I see is to bind all your additional data to IListItems using IListItem.Tag property. Maybe you will be able to get rid of the internal array at all and use ThumbnailListView.Items collection instead.

Regarding to drag-n-drop specific of your application - as you understand, we have no such built-in feature. In your case simple "UseDragToMove" is useless, so you should to re-implement this functionality with additional restrictions for the first/last elements.

You can look at Aurigma.GraphicsMill.WinControls source code (not available in trial version) or at MultFrameTiff demo source code and use them as base point for your implementation.