public static bool KeepFirstHalfOfItemsFilter(DataItem o)
{
return o.Id < ItemCount / 2;
}
public static int SortItemsDescending(DataItem x, DataItem y)
{
return -SortItemsAscending(x, y);
}
public static bool KeepOddItemsFilter(DataItem o)
{
return o.Id % 2 == 1; // keep all odd items only.
}
public static int SortEvenItemsBeforeOdd(DataItem x, DataItem y)
{
var a = x.Id;
var b = y.Id;
return (a % 2 == b % 2) ? a - b : (a % 2 == 0 ? -1 : 1);
}
public static int SortItemsAscending(DataItem x, DataItem y)
{
var a = x.Id;
var b = y.Id;
return a - b;
}
public void InsertItemShouldBeInSameOrderInModel()
{
var model = GridViewUtils.CreateModel();
var filtered = new FilterCollection<DataItem>(model);
filtered.Filter = GridViewUtils.KeepOddItemsFilter;
const int filterInsertIndex = 10;
var item = new DataItem(1000);
filtered.Insert(filterInsertIndex, item);
Assert.AreEqual(filtered[filterInsertIndex].Id, 21, "#1 Item should NOT be inserted at the specified index, since it is an even number");
Assert.AreEqual(filtered.IndexOf(item), -1, "#2 Item should NOT be in the filtered list");
Assert.AreEqual(model.IndexOf(filtered[filterInsertIndex]) - 1, model.IndexOf(item), "#3 Item should be inserted right before item at filter location");
item = new DataItem(1001);
filtered.Insert(filterInsertIndex, item);
Assert.AreEqual(filtered[filterInsertIndex].Id, 1001, "#4 Item with odd number should be inserted at the specified index");
Assert.AreEqual(filtered.IndexOf(item), filterInsertIndex, "#5 Item should be in the filtered list at the insert location");
Assert.AreEqual(model.IndexOf(filtered[filterInsertIndex + 1]) - 1, model.IndexOf(item), "#6 Item should be inserted right before item at filter location");
// refresh the list
filtered.Refresh();
// re-test inserted item, it should be at the same index.
Assert.AreEqual(filtered[filterInsertIndex].Id, 1001, "#7 Item with odd number should be inserted at the specified index");
Assert.AreEqual(filtered.IndexOf(item), filterInsertIndex, "#8 Item should be in the filtered list at the insert location");
Assert.AreEqual(model.IndexOf(filtered[filterInsertIndex + 1]) - 1, model.IndexOf(item), "#9 Item should be inserted right before item at filter location");
}
public void InsertItemShouldTriggerCorrectChange()
{
var model = GridViewUtils.CreateModel();
var filtered = new FilterCollection<DataItem>(model);
filtered.Sort = GridViewUtils.SortEvenItemsBeforeOdd;
int newIndex = -1;
filtered.CollectionChanged += (sender, e) =>
{
Assert.AreEqual(NotifyCollectionChangedAction.Add, e.Action, "Action should be add");
newIndex = e.NewStartingIndex;
};
var item = new DataItem(1000);
const int insertIndex = 50;
filtered.Insert(insertIndex, item);
var index = filtered.IndexOf(item);
Assert.AreEqual(filtered[index].Id, item.Id, "Index reported does not have correct item");
Assert.AreEqual(index, newIndex, "Triggered event should have correct index");
Assert.AreEqual(insertIndex, index, "Index of item should be the inserted index");
}
public static bool KeepFirstHalfOfItemsFilter(DataItem o)
{
return(o.Id < ItemCount / 2);
}
public static bool KeepOddItemsFilter(DataItem o)
{
return(o.Id % 2 == 1); // keep all odd items only.
}
public static int SortItemsDescending(DataItem x, DataItem y)
{
return(-SortItemsAscending(x, y));
}