public void DragStart(DragInfo info)
{
if (info.SourceItem == null)
{
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))
{
rlb.SetValue(DragDropVisual.VisualProperty, item);
break;
}
}
SearchNodeHistoryViewModel searchVM = rlb.DataContext as SearchNodeHistoryViewModel;
if (searchVM == null || searchVM.SelectedVideo == null)
{//如果没有选中项，或者选中项不是视频节点，取消拖拽。
info.Cancelled = true;
}
}
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
SearchNodeHistoryViewModel model = value as SearchNodeHistoryViewModel;
List <string> ids = new List <string>();
FindAllVideo(model.Node, ids);
return(ids);
}
void addNewSourceAboutAllNodeChildren(List <CctvNode> nodes, List <SearchNodeHistoryViewModel> modellist, bool showThumbnails)
{
var nodelist = nodes?.Where(e => e.IsCctvNode()).ToList();
if (nodelist != null && nodelist.Count > 0)
{
nodelist?.ForEach(e =>
{
SearchNodeHistoryViewModel model = new SearchNodeHistoryViewModel(AllowDrag);
model.UpdateNode(e, showThumbnails);
modellist.Add(model);
});
}
}
void addNewSourceAboutAllVideoChildren(List <CctvNode> nodes, List <SearchNodeHistoryViewModel> modellist)
{
var videolist = nodes?.Where(e => e.Type == CctvNode.NodeType.Video).ToList();
if (videolist != null && videolist.Count > 0)
{
var videoModel = new SearchNodeHistoryViewModel(AllowDrag);
videoModel.UpdateNode(new CctvNode()
{
Name = "视频", Type = CctvNode.NodeType.Unknown, Children = videolist.ToArray()
}, true);
modellist.Add(videoModel);
}
}
public void DragEnd(DragInfo info)
{
if (info.SourceItem == null)
{
return;
}
RadListBox rlb = info.Source as RadListBox;
if (rlb != null)
{
SearchNodeHistoryViewModel searchVM = rlb.DataContext as SearchNodeHistoryViewModel;
if (searchVM != null)
{
searchVM.SelectedVideo = null;
}
}
}
