public void ClearAsync()
{
var sharedSource = new SharedSource <MySharedItem>();
Assert.AreEqual(0, sharedSource.Items.Count);
Assert.AreEqual(-1, sharedSource.SelectedIndex);
var item1 = sharedSource.AddNew("A");
var item2 = sharedSource.AddNew("B");
var item3 = sharedSource.AddNew("C");
Assert.AreEqual(3, sharedSource.Items.Count);
Assert.AreEqual(item1, sharedSource.Items.ElementAt(0));
Assert.AreEqual(item2, sharedSource.Items.ElementAt(1));
Assert.AreEqual(item3, sharedSource.Items.ElementAt(2));
Assert.AreEqual(2, sharedSource.SelectedIndex);
Assert.AreEqual(item3, sharedSource.SelectedItem);
// C => B => A
var selections = new Dictionary <int, object>();
sharedSource.SelectedItemChanged += (s, e) =>
{
// 1 B... 0 A
selections.Add(e.SelectedIndex, e.SelectedItem);
};
sharedSource.Clear();
Assert.AreEqual(true, item1.IsCanDeactivateInvoked);
Assert.AreEqual(true, item1.IsOnNavigatingFromInvoked);
Assert.AreEqual(true, item2.IsCanDeactivateInvoked);
Assert.AreEqual(true, item2.IsOnNavigatingFromInvoked);
Assert.AreEqual(true, item3.IsCanDeactivateInvoked);
Assert.AreEqual(true, item3.IsOnNavigatingFromInvoked);
Assert.AreEqual(0, sharedSource.Items.Count);
Assert.AreEqual(-1, sharedSource.SelectedIndex);
Assert.AreEqual(null, sharedSource.SelectedItem);
// item3 removed(old index 2) ... select item2(index 1)
Assert.AreEqual(1, selections.ElementAt(0).Key);
Assert.AreEqual(item2, selections.ElementAt(0).Value);
// item1 removed change index, select item1(index 0)
Assert.AreEqual(0, selections.ElementAt(1).Key);
Assert.AreEqual(item1, selections.ElementAt(1).Value);
// empty items
Assert.AreEqual(-1, selections.ElementAt(2).Key);
Assert.AreEqual(null, selections.ElementAt(2).Value);
Assert.AreEqual(3, selections.Count);
}
public void ClearAsync_With_One_Item_CannotDeactivate()
{
var sharedSource = new SharedSource <MySharedItem>();
Assert.AreEqual(0, sharedSource.Items.Count);
Assert.AreEqual(-1, sharedSource.SelectedIndex);
var item1 = sharedSource.AddNew("A");
var item2 = sharedSource.AddNew("B");
var item3 = sharedSource.AddNew("C");
Assert.AreEqual(3, sharedSource.Items.Count);
Assert.AreEqual(item1, sharedSource.Items.ElementAt(0));
Assert.AreEqual(item2, sharedSource.Items.ElementAt(1));
Assert.AreEqual(item3, sharedSource.Items.ElementAt(2));
Assert.AreEqual(2, sharedSource.SelectedIndex);
Assert.AreEqual(item3, sharedSource.SelectedItem);
// C => B X => A
var selections = new Dictionary <int, object>();
sharedSource.SelectedItemChanged += (s, e) =>
{
// 1 B... 0 B
selections.Add(e.SelectedIndex, e.SelectedItem);
};
item2.CDeactivate = false;
sharedSource.Clear();
Assert.AreEqual(true, item1.IsCanDeactivateInvoked);
Assert.AreEqual(true, item1.IsOnNavigatingFromInvoked);
Assert.AreEqual(true, item2.IsCanDeactivateInvoked);
Assert.AreEqual(false, item2.IsOnNavigatingFromInvoked);
Assert.AreEqual(true, item3.IsCanDeactivateInvoked);
Assert.AreEqual(true, item3.IsOnNavigatingFromInvoked);
Assert.AreEqual(1, sharedSource.Items.Count);
Assert.AreEqual(0, sharedSource.SelectedIndex);
Assert.AreEqual(item2, sharedSource.SelectedItem);
// item3 removed(old index 2) ... select item2(index 1 B)
Assert.AreEqual(1, selections.ElementAt(0).Key);
Assert.AreEqual(item2, selections.ElementAt(0).Value);
// item1 removed change index, same seleected item item2
Assert.AreEqual(0, selections.ElementAt(1).Key);
Assert.AreEqual(item2, selections.ElementAt(1).Value);
Assert.AreEqual(2, selections.Count);
}