private void ListView_PreviewMouseMove(object sender, MouseEventArgs e)
{
if ((e.LeftButton == MouseButtonState.Pressed) && (fpMouseDownPos.HasValue))
{
Point pt = e.GetPosition(fListView);
if ((fpMouseDownPos.Value - pt).Length > 10)
{
ListViewItem dragStartItem = WpfListViewAssist.GetListViewItemAtPoint(fListView, fpMouseDownPos.Value);
if (dragStartItem != null)
{
DragDropEffects effects = DragDropEffects.Move;
if (fListView.SelectedItems.Count > 1)
{
effects = DragDropEffects.Copy;
}
DragDrop.DoDragDrop(fListView, dragStartItem, effects);
}
fInsertionMark.Hide();
fpMouseDownPos = null; // Make sure this code is executed once per Mouse Down
e.Handled = true;
}
}
}
private void ListView_DragOver(object sender, System.Windows.DragEventArgs e)
{
int sourceIndex = -1;
if (e.Data.GetDataPresent(typeof(ListViewItem)))
{
ListViewItem draggedItem = (ListViewItem)e.Data.GetData(typeof(ListViewItem));
if (draggedItem != null)
{
sourceIndex = fListView.Items.IndexOf(draggedItem.Content);
}
}
else if (e.Data.GetDataPresent(DataFormats.FileDrop, false))
{
// Importing files
if (!Enabled)
{
e.Effects = DragDropEffects.None;
}
}
else
{
e.Effects = DragDropEffects.None;
}
if (e.Effects == DragDropEffects.None)
{
fInsertionMark.Hide();
}
else
{
int targetIndex = -1;
Point pt = e.GetPosition(fListView);
ListViewItem item = WpfListViewAssist.GetListViewItemAtPoint(fListView, pt);
if (item != null)
{
targetIndex = fListView.Items.IndexOf(item.Content);
}
if (targetIndex < 0)
{
fInsertionMark.Hide();
}
else
{
int scrollIndex = targetIndex;
if (pt.Y < item.ActualHeight)
{
if (scrollIndex > 0)
{
scrollIndex--;
}
}
else if (pt.Y > (fListView.ActualHeight - item.ActualHeight))
{
if (scrollIndex < (fListView.Items.Count - 1))
{
scrollIndex++;
}
}
else
{
// No Scrolling
}
if (scrollIndex != targetIndex)
{
fInsertionMark.Hide();
fListView.ScrollIntoView(fListView.Items[scrollIndex]);
System.Threading.Thread.Sleep(70); //slow down the scrolling a bit
}
else if (sourceIndex < 0)
{
fInsertionMark.Show(item, true);
}
else if (targetIndex == sourceIndex)
{
fInsertionMark.Hide();
}
else
{
fInsertionMark.Show(item, targetIndex < sourceIndex);
}
}
}
e.Handled = true;
}
