public WaterfallStreamViewer()
{
this.DefaultStyleKey = typeof(WaterfallStreamViewer);
CollectionView = new DependencyCollectionView()
{
};
CollectionView.GroupingManager = new ContentHeightGroupingManager(this);
var b = new Binding()
{
Source = this,
Path = new PropertyPath(nameof(Loader)),
Mode = BindingMode.TwoWay
};
BindingOperations.SetBinding(CollectionView, DependencyCollectionView.IncrementalLoaderProperty, b);
this.Loaded += (o, e) =>
{
var b2 = new Binding()
{
Source = this,
Path = new PropertyPath(nameof(CollectionView.GroupingManager.GroupCount)),
};
BindingOperations.SetBinding(CollectionView.GroupingManager, DependencyCollectionViewGroupingManagerBase.GroupCountProperty, b2);
//CollectionView.GroupingManager.GroupCount = GroupCount;
};
}
public void AutoGroupTest()
{
var cw = new DependencyCollectionView();
CreateGroups(cw);
Enumerable.Range(0, 100)
.ToList()
.ForEach(i => cw.Add(i));
Assert.AreEqual(cw.CollectionGroups.Count, 5);
foreach (ICollectionViewGroup item in cw.CollectionGroups)
{
Assert.AreEqual(20, item.GroupItems.Count);
}
cw.Remove(13);
Assert.AreEqual(
19,
cw
.CollectionGroups
.OfType<SelfServiceDependencyCollectionViewGroupBase>()
.Where(g => (int)g.Group == 3)
.Select(g => g.GroupItems.Count).First());
Assert.AreEqual(
99,
cw.Count);
var incFac = new DependencyCollectionViewDelegateIncrementalLoader(
(v, inc) => true,
async (v, inc, c) =>
{
Enumerable.Range((int)v[v.Count - 1] + 1, c)
.ToList().ForEach(val =>
v.Add(val));
await Task.Yield();
return new LoadMoreItemsResult { Count = (uint)c };
}
);
cw.IncrementalLoader = incFac;
var t= cw.LoadMoreItemsAsync(10);
Assert.AreEqual(
109,
cw.Count);
Assert.AreEqual(
21,
cw
.CollectionGroups
.OfType<SelfServiceDependencyCollectionViewGroupBase>()
.Where(g => (int)g.Group == 3)
.Select(g => g.GroupItems.Count).First());
}
public void AddTest()
{
var cw = new DependencyCollectionView();
cw.Add("a");
cw.Add("b");
Assert.AreEqual(cw.Count, 2);
}
public void AddTest()
{
var cw = new DependencyCollectionView();
cw.Add("a");
cw.Add("b");
Assert.AreEqual(cw.Count, 2);
}
public DependencyCollectionViewGroupingManagerBase(DependencyCollectionView collectionView)
{
CollectionView = collectionView;
var binding = new Binding
{
Path = new PropertyPath(nameof(collectionView.IncrementalLoader)),
Source = CollectionView
};
BindingOperations.SetBinding(this, IncrementalLoaderProperty, binding);
}
public DependencyCollectionViewGroup(object groupObject, DependencyCollectionView parentView)
{
Group = groupObject;
var groupItems = new DependencyCollectionView();
GroupItems = groupItems;
ParentView = parentView;
var loader = new DependencyCollectionViewProxyIncrementalLoader()
{
InnerLoader = parentView.IncrementalLoader
};
groupItems.IncrementalLoader = loader;
}
private static void CreateGroups(DependencyCollectionView cw)
{
Func <int, SelfServiceDependencyDelegateCollectionViewGroup> fac =
n =>
{
return(new SelfServiceDependencyDelegateCollectionViewGroup(n, cw,
(c, o) =>
{
if (o is int)
{
var v = (int)o;
var moded = v % 5;
if (moded == n)
{
c.GroupItems.Add(o);
return true;
}
}
return false;
},
(c, o) =>
{
if (o is int)
{
return c.GroupItems.Remove(o);
}
return false;
}));
};
cw.CollectionGroups.Add(fac(0));
cw.CollectionGroups.Add(fac(1));
cw.CollectionGroups.Add(fac(2));
cw.CollectionGroups.Add(fac(3));
cw.CollectionGroups.Add(fac(4));
}
private static void CreateGroups(DependencyCollectionView cw)
{
Func<int, SelfServiceDependencyDelegateCollectionViewGroup> fac =
n =>
{
return new SelfServiceDependencyDelegateCollectionViewGroup(n, cw,
(c, o) =>
{
if (o is int)
{
var v = (int)o;
var moded = v % 5;
if (moded == n)
{
c.GroupItems.Add(o);
return true;
}
}
return false;
},
(c, o) =>
{
if (o is int)
{
return c.GroupItems.Remove(o);
}
return false;
});
};
cw.CollectionGroups.Add(fac(0));
cw.CollectionGroups.Add(fac(1));
cw.CollectionGroups.Add(fac(2));
cw.CollectionGroups.Add(fac(3));
cw.CollectionGroups.Add(fac(4));
}
public void AutoGroupTest()
{
var cw = new DependencyCollectionView();
CreateGroups(cw);
Enumerable.Range(0, 100)
.ToList()
.ForEach(i => cw.Add(i));
Assert.AreEqual(cw.CollectionGroups.Count, 5);
foreach (ICollectionViewGroup item in cw.CollectionGroups)
{
Assert.AreEqual(20, item.GroupItems.Count);
}
cw.Remove(13);
Assert.AreEqual(
19,
cw
.CollectionGroups
.OfType <SelfServiceDependencyCollectionViewGroupBase>()
.Where(g => (int)g.Group == 3)
.Select(g => g.GroupItems.Count).First());
Assert.AreEqual(
99,
cw.Count);
var incFac = new DependencyCollectionViewDelegateIncrementalLoader(
(v, inc) => true,
async(v, inc, c) =>
{
Enumerable.Range((int)v[v.Count - 1] + 1, c)
.ToList().ForEach(val =>
v.Add(val));
await Task.Yield();
return(new LoadMoreItemsResult {
Count = (uint)c
});
}
);
cw.IncrementalLoader = incFac;
var t = cw.LoadMoreItemsAsync(10);
Assert.AreEqual(
109,
cw.Count);
Assert.AreEqual(
21,
cw
.CollectionGroups
.OfType <SelfServiceDependencyCollectionViewGroupBase>()
.Where(g => (int)g.Group == 3)
.Select(g => g.GroupItems.Count).First());
}
private void InitCollectionViewGroup(DependencyCollectionView view, int count)
{
if (view.CollectionGroups?.Count != count)
{
view.CollectionGroups.Clear();
for (int i = 0; i < count; i++)
{
var g = new DependencyCollectionViewGroup(i, view);
view.CollectionGroups.Add(g);
}
if ((view.CollectionGroups?.Count ?? 0) != 0)
{
foreach (var item in view)
{
this.TryAddItemToGroup(item);
}
}
}
}
public SelfServiceDependencyCollectionViewGroupBase(object groupObject, DependencyCollectionView parentView)
: base(groupObject, parentView)
{
}
public SelfServiceDependencyDelegateCollectionViewGroup(object groupObject, DependencyCollectionView parentView, Func<ICollectionViewGroup, object, bool> tryAddItemToGroup, Func<ICollectionViewGroup, object, bool> tryRemoveItemFromGroup)
: base(groupObject, parentView)
{
_OnAddingItemToGroup = tryAddItemToGroup;
_OnRemovingingItemRemoveGroup = tryRemoveItemFromGroup;
}
