/// <summary>
/// <para>Constructor of Collection View</para>
/// <para>构造函数</para>
/// </summary>
/// <param name="items"><para>Initialing Items</para><para>初始内容集合</para></param>
/// <param name="loader"><para>increanatal loader</para><para>自增加载器</para></param>
public CollectionView(
IEnumerable <T> items = null,
CollectionViewIncrementalLoader <T> loader = null)
: base(items.ToArray())
{
items = items ?? new T[0];
_loader = loader;
if (loader != null)
{
loader.CollectionView = this;
}
}
public void InitData(CollectionViewType type)
{
var rnd = new Random();
var grps = Enumerable.Range(0, 100)
.Select(i =>
new
{
Index = i,
Item = new TreeViewItemModel <string>
{
Value = "Item_" + i.ToString()
}
})
.GroupBy(itm => (int)(itm.Index / 10))
.Select(grp =>
new TreeViewItemModel <string>
{
Value = "Group " + grp.Key.ToString(),
Children = new ObservableCollection <ITreeItem <object, TreeViewItemState> >(
grp.Select(gi => gi.Item)
)
}).ToArray();
var items =
grps.SelectMany(x => x.Children.Select(c =>
{
var mc = c as TreeViewItemModel <string>;
if (mc != null)
{
mc.Parent = x;
}
return(mc);
}));
switch (type)
{
case CollectionViewType.Normal:
CollectionView = new CollectionView <TreeViewItemModel <string> >(items);
break;
case CollectionViewType.Loading:
var loader = new CollectionViewIncrementalLoader <TreeViewItemModel <string> >
(
async(cv, cnt) =>
{
return(new IncrementalLoadResult <TreeViewItemModel <string> >
{
HaveMore = true,
NewItems = Enumerable.Range(0, cnt)
.Select(
i => new TreeViewItemModel <string> {
Value = "New_" + i.ToString(), Parent = grps[i % 10]
}
)
.ToArray()
});
},
(cv) => true
);
CollectionView = new CollectionView <TreeViewItemModel <string> >(items, loader);
break;
case CollectionViewType.Grouped:
var igrps = CollectionViewGroupCollection <TreeViewItemModel <string> > .Create(
x => x.Parent,
x => x.Parent);
CollectionView = new CollectionView <TreeViewItemModel <string> >(items, igrps);
break;
default:
break;
}
}
