/// <summary>
/// 选择行集合变化
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void OnSelectedItemsChanged(object sender, NotifyCollectionChangedEventArgs e)
{
// HasSelected状态
bool hasSelected = HasSelected;
if (_selectedRows.Count == 0 && hasSelected)
{
ClearValue(HasSelectedProperty);
}
else if (_selectedRows.Count > 0 && !hasSelected)
{
HasSelected = true;
}
if (e.Action == NotifyCollectionChangedAction.Add)
{
// 增加
if (e.NewItems != null && e.NewItems.Count > 0)
{
List <object> adds = new List <object>();
foreach (var row in e.NewItems.OfType <TvItem>())
{
row.IsSelected = true;
adds.Add(row.Data);
}
SelectionChanged?.Invoke(this, new SelectionChangedEventArgs(new List <object>(), adds));
}
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
// 删除
if (e.OldItems != null && e.OldItems.Count > 0)
{
List <object> removals = new List <object>();
foreach (var row in e.OldItems.OfType <TvItem>())
{
row.IsSelected = false;
removals.Add(row.Data);
}
SelectionChanged?.Invoke(this, new SelectionChangedEventArgs(removals, new List <object>()));
}
}
else if (e.Action == NotifyCollectionChangedAction.Reset)
{
// 清空
var removals = new List <object>();
foreach (var row in RootItems.GetAllItems())
{
if (row.IsSelected.HasValue && row.IsSelected.Value)
{
removals.Add(row.Data);
}
row.IsSelected = false;
}
if (removals.Count > 0 && SelectionChanged != null)
{
SelectionChanged(this, new SelectionChangedEventArgs(removals, new List <object>()));
}
}
}
/// <summary>
/// 获取同层下面的节点
/// </summary>
/// <param name="p_item"></param>
/// <returns></returns>
public object GetFollowingBrother(object p_item)
{
var item = (from row in RootItems.GetAllItems()
where row.Data == p_item
select row).FirstOrDefault();
if (item == null)
{
return(null);
}
int index;
if (item.Parent == null)
{
index = RootItems.IndexOf(item);
if (index >= 0 && index < RootItems.Count - 1)
{
return(RootItems[index + 1].Data);
}
}
else
{
index = item.Parent.Children.IndexOf(item);
if (index >= 0 && index < item.Parent.Children.Count - 1)
{
return(item.Parent.Children[index + 1].Data);
}
}
return(null);
}
void SetAllExpandState(bool p_isExpanded)
{
foreach (var item in RootItems.GetAllItems())
{
item.SetExpandState(p_isExpanded);
}
RootItems.Invalidate();
}
/// <summary>
/// 滚动到指定的节点
/// </summary>
/// <param name="p_item"></param>
public void ScrollInto(object p_item)
{
if (_panel != null)
{
var item = (from row in RootItems.GetAllItems()
where row.Data == p_item
select row).FirstOrDefault();
if (item != null)
{
_panel.ScrollIntoItem(item);
}
}
}
/// <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();
}