private void SingleDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(TModel)))
{
TModel item = (TModel)e.Data.GetData(typeof(TModel));
//index为放置时鼠标下元素项的索引
int index = GetCurrentIndex(new GetPositionDelegate(e.GetPosition));
ObservableCollection <TModel> source = null;
if (index > -1 && View.ItemsSource is ObservableCollection <TModel> o)
{
source = o;
}
else if (index > -1 && View.ItemsSource is System.Windows.Data.ListCollectionView lcv)
{
//需要支持分组情况下的列表
source = lcv.SourceCollection as ObservableCollection <TModel>;
}
if (source != null)
{
//拖动元素集合的第一个元素索引
int oldIndex = source.IndexOf(item);
if (oldIndex == index)
{
return;
}
//下边那个循环要求数据源必须为ObservableCollection<T>类型，T为对象
source.Move(oldIndex, index);
SingleItemDragDroped?.Invoke(this, new SingleItemDragDropedEventArgs(oldIndex, index));
// lvw.SelectedItems.Clear();
//ListView.SelectedIndex = index;
}
}
}
private void SingleDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(TModel)))
{
TModel item = (TModel)e.Data.GetData(typeof(TModel));
//index为放置时鼠标下元素项的索引
int index = GetCurrentIndex(new GetPositionDelegate(e.GetPosition));
if (index > -1)
{
//拖动元素集合的第一个元素索引
int oldIndex = (View.ItemsSource as ObservableCollection <TModel>).IndexOf(item);
if (oldIndex == index)
{
return;
}
//下边那个循环要求数据源必须为ObservableCollection<T>类型，T为对象
(View.ItemsSource as ObservableCollection <TModel>).Move(oldIndex, index);
SingleItemDragDroped?.Invoke(this, new SingleItemDragDropedEventArgs(oldIndex, index));
// lvw.SelectedItems.Clear();
//ListView.SelectedIndex = index;
}
}
}
