public void Mode_For_SelectedIndex_Is_TwoWay_By_Default()
{
var items = new[]
{
new Item(),
new Item(),
new Item(),
};
var vm = new MasterViewModel
{
Child = new ChildViewModel
{
Items = items,
SelectedIndex = 1,
}
};
var target = new SelectingItemsControl {
DataContext = vm
};
var itemsBinding = new Binding("Child.Items");
var selectedIndBinding = new Binding("Child.SelectedIndex");
target.Bind(SelectingItemsControl.ItemsProperty, itemsBinding);
target.Bind(SelectingItemsControl.SelectedIndexProperty, selectedIndBinding);
Assert.Equal(1, target.SelectedIndex);
target.SelectedIndex = 2;
Assert.Equal(2, target.SelectedIndex);
Assert.Equal(2, vm.Child.SelectedIndex);
}
public void Changing_DataContext_Should_Not_Clear_Nested_ViewModel_SelectedItem()
{
var items = new[]
{
new Item(),
new Item(),
};
var vm = new MasterViewModel
{
Child = new ChildViewModel
{
Items = items,
SelectedItem = items[1],
}
};
var target = new SelectingItemsControl {
DataContext = vm
};
var itemsBinding = new Binding("Child.Items");
var selectedBinding = new Binding("Child.SelectedItem");
target.Bind(SelectingItemsControl.ItemsProperty, itemsBinding);
target.Bind(SelectingItemsControl.SelectedItemProperty, selectedBinding);
Assert.Equal(1, target.SelectedIndex);
Assert.Same(vm.Child.SelectedItem, target.SelectedItem);
items = new[]
{
new Item {
Value = "Item1"
},
new Item {
Value = "Item2"
},
new Item {
Value = "Item3"
},
};
vm = new MasterViewModel
{
Child = new ChildViewModel
{
Items = items,
SelectedItem = items[2],
}
};
target.DataContext = vm;
Assert.Equal(2, target.SelectedIndex);
Assert.Same(vm.Child.SelectedItem, target.SelectedItem);
}
