private void lv_Input_MouseMove(object sender, System.Windows.Input.MouseEventArgs e)
{
// Get the current mouse position
Point mousePos = e.GetPosition(null);
Vector diff = startPoint - mousePos;
if (e.LeftButton == MouseButtonState.Pressed &&
(Math.Abs(diff.X) > SystemParameters.MinimumHorizontalDragDistance ||
Math.Abs(diff.Y) > SystemParameters.MinimumVerticalDragDistance))
{
// Get the dragged ListViewItem
ListView listView = sender as ListView;
ListViewItem listViewItem = FindAnchestor <ListViewItem>((DependencyObject)e.OriginalSource);
if (listViewItem == null)
{
return; // Abort
}
// Find the data behind the ListViewItem
Models.FileObject item = (Models.FileObject)listView.ItemContainerGenerator.ItemFromContainer(listViewItem);
if (item == null)
{
return; // Abort
}
// Initialize the drag & drop operation
startIndex = listView.SelectedIndex;
DataObject dragData = new DataObject("FileObject", item);
DragDrop.DoDragDrop(listViewItem, dragData, DragDropEffects.Copy | DragDropEffects.Move);
}
}
private void lv_Input_Drop(object sender, DragEventArgs e)
{
int index = -1;
if (e.Data.GetDataPresent("FileObject") && sender == e.Source)
{
// Get the drop ListViewItem destination
ListView listView = sender as ListView;
ListViewItem listViewItem = FindAnchestor <ListViewItem>((DependencyObject)e.OriginalSource);
if (listViewItem == null)
{
// Abort
e.Effects = DragDropEffects.None;
return;
}
// Find the data behind the ListViewItem
Models.FileObject item = (Models.FileObject)listView.ItemContainerGenerator.ItemFromContainer(listViewItem);
// Move item into observable collection
// (this will be automatically reflected to lstView.ItemsSource)
e.Effects = DragDropEffects.Move;
index = viewModel.Files.IndexOf(item);
if (startIndex >= 0 && index >= 0)
{
viewModel.Files.Move(startIndex, index);
}
startIndex = -1; // Done!
viewModel.RefreshFileNums();
}
}
