void SetAllExpandState(bool p_isExpanded)
{
foreach (var item in RootItems.GetAllItems())
{
item.SetExpandState(p_isExpanded);
}
RootItems.Invalidate();
}
/// <summary>
/// 触发加载子节点事件
/// </summary>
/// <param name="p_item"></param>
/// <returns></returns>
internal async Task OnLoadingChild(TvItem p_item)
{
if (LoadingChild == null)
{
return;
}
var args = new LoadingChildArgs(p_item);
LoadingChild(this, args);
await args.EnsureAllCompleted();
if (args.Children != null)
{
foreach (var item in args.Children)
{
TvItem ti = new TvItem(this, item, p_item);
ti.ExpandedState = TvItemExpandedState.NotExpanded;
p_item.Children.Add(ti);
}
RootItems.Invalidate();
}
p_item.HasLoadedChildren = true;
}
/// <summary>
/// 删除数据对应的节点，若节点为选择状态，则删除后选择同层后一节点或父节点
/// </summary>
/// <param name="p_item"></param>
public void DeleteItem(object p_item)
{
var item = (from row in RootItems.GetAllItems()
where row.Data == p_item
select row).FirstOrDefault();
if (item == null)
{
return;
}
int index;
if (item.Parent == null)
{
index = RootItems.IndexOf(item);
if (index > -1)
{
RootItems.RemoveAt(index);
if ((bool)item.IsSelected)
{
if (index < RootItems.Count)
{
SelectedItem = RootItems[index].Data;
}
else if (RootItems.Count > 0)
{
SelectedItem = RootItems[RootItems.Count - 1].Data;
}
else
{
SelectedItem = null;
}
}
}
}
else
{
var ls = item.Parent.Children;
index = ls.IndexOf(item);
if (index > -1)
{
ls.RemoveAt(index);
if ((bool)item.IsSelected)
{
if (index < ls.Count)
{
SelectedItem = ls[index].Data;
}
else if (ls.Count > 0)
{
SelectedItem = ls[ls.Count - 1].Data;
}
else
{
SelectedItem = item.Parent.Data;
}
}
}
}
RootItems.Invalidate();
}