public void Raises_Selection_Changed_On_Items_Reset()
{
var items = new ResettingCollection(new[] { "foo", "bar", "baz" });
var target = CreateTarget(source: items);
target.SelectedIndex = 1;
var changed = new List <string>();
target.PropertyChanged += (s, e) => changed.Add(e.PropertyName);
var oldSelectedIndex = target.SelectedIndex;
var oldSelectedItem = target.SelectedItem;
items.Reset(new string[0]);
Assert.NotEqual(oldSelectedIndex, target.SelectedIndex);
Assert.NotEqual(oldSelectedItem, target.SelectedItem);
Assert.Equal(-1, target.SelectedIndex);
Assert.Equal(null, target.SelectedItem);
Assert.Empty(target.WritableSelectedItems);
Assert.Contains(nameof(target.SelectedIndex), changed);
Assert.Contains(nameof(target.SelectedItem), changed);
}
public void Restores_Selection_On_Items_Reset()
{
var items = new ResettingCollection(new[] { "foo", "bar", "baz" });
var target = CreateTarget(source: items);
target.SelectedIndex = 1;
items.Reset(new[] { "baz", "foo", "bar" });
Assert.Equal(2, target.SelectedIndex);
}
public void Restores_Selection_On_Items_Reset()
{
var items = new ResettingCollection(new[] { "foo", "bar", "baz" });
var model = new SelectionModel <string> {
Source = items
};
var target = new SelectedItemsSync(model);
model.SelectedIndex = 1;
items.Reset(new[] { "baz", "foo", "bar" });
Assert.Equal(2, model.SelectedIndex);
}
public void Preserves_SelectedItem_On_Items_Reset()
{
var items = new ResettingCollection(new[] { "foo", "bar", "baz" });
var target = CreateTarget(source: items);
target.SelectedItem = "foo";
Assert.Equal(0, target.SelectedIndex);
items.Reset(new string[] { "baz", "foo", "bar" });
Assert.Equal("foo", target.SelectedItem);
Assert.Equal(1, target.SelectedIndex);
}
public void AutoScrollToSelectedItem_On_Reset_Works()
{
// Issue #3148
using (UnitTestApplication.Start(TestServices.StyledWindow))
{
var items = new ResettingCollection(100);
var target = new ListBox
{
Items = items,
ItemTemplate = new FuncDataTemplate <string>((x, _) =>
new TextBlock
{
Text = x,
Width = 100,
Height = 10
}),
AutoScrollToSelectedItem = true,
VirtualizationMode = ItemVirtualizationMode.Simple,
};
var root = new TestRoot(true, target);
root.Measure(new Size(100, 100));
root.Arrange(new Rect(0, 0, 100, 100));
Assert.True(target.Presenter.Panel.Children.Count > 0);
Assert.True(target.Presenter.Panel.Children.Count < 100);
target.SelectedItem = "Item99";
// #3148 triggered here.
items.Reset(new[] { "Item99" });
Assert.Equal(0, target.SelectedIndex);
Assert.Equal(1, target.Presenter.Panel.Children.Count);
}
}
