public void DragEnd(DragInfo info)
{
if (_dragStartIndex < 0)
{
return;
}
RadListBox rlb = info.Source as RadListBox;
if (rlb != null)
{
TimeSwitchViewModel vm = rlb.DataContext as TimeSwitchViewModel;
if (vm != null)
{
vm.ToDropPlan(_dragStartIndex);
}
_dragStartIndex = -1;
}
}
public void DragStart(DragInfo info)
{
if (info.SourceItem == null || info.EventOriginalSource is TextBox)
{
info.Cancelled = true;
return;
}
RadListBox rlb = info.Source as RadListBox;
if (rlb != null)
{
//设置拖拽窗口视觉效果。
IEnumerable <RadListBoxItem> items = rlb.FindVisualChildren <RadListBoxItem>();
foreach (RadListBoxItem item in items)
{
if (item.DataContext.Equals(rlb.SelectedItem))
{
ContentPresenter cp = item.FindVisualChild <ContentPresenter>();
if (cp != null)
{
rlb.SetValue(DragDropVisual.VisualProperty, cp);
}
else
{
rlb.SetValue(DragDropVisual.VisualProperty, item);
}
break;
}
}
TimeSwitchViewModel vm = rlb.DataContext as TimeSwitchViewModel;
//如果没有选中项，或者选中项不是有效节点，取消拖拽。
if (!(vm != null && vm.SelectedPlan != null && vm.SelectedPlan != TimeSwitchViewModel.AddPlanStatic))
{
info.Cancelled = true;
}
else if (vm != null && vm.SelectedPlan != null)
{
var list = vm.PlansSource.Source as ObservableCollection <LayoutPlanModel>;
_dragStartIndex = list.IndexOf(vm.SelectedPlan);
vm.ToDragPlan();
}
}
}
public void Drop(DropInfo info)
{
RadListBox rlb = info.Source as RadListBox;
if (rlb != null)
{
TimeSwitchViewModel source = rlb.DataContext as TimeSwitchViewModel;
if (source != null && source.DragPlan != null && source.DragPlan != TimeSwitchViewModel.AddPlanStatic)
{
var dragSource = source.DragPlan;
TimeSwitchViewModel target = (info.Target as RadListBox)?.DataContext as TimeSwitchViewModel;
if (target != source)
{
return;
}
if (target != null)
{
var list = target.PlansSource.Source as ObservableCollection <LayoutPlanModel>;
source.ToDropPlan(info.InsertIndex);
GC.Collect();
}
}
}
}
