public void WhenBehaviorIsAttached_ThenItSynchronizesTheInitialSelection()
{
var behavior = new SynchronizeSelectedItems();
BindingOperations.SetBinding(
behavior,
SynchronizeSelectedItems.SelectionsProperty,
new Binding("ObservableSelections"));
var listBox = new ListBox()
{
SelectionMode = SelectionMode.Multiple
};
BindingOperations.SetBinding(
listBox, ListBox.ItemsSourceProperty,
new Binding("Items"));
var itemsHolder =
new ItemsHolder
{
Items = { "a", "b", "c", "d" },
ObservableSelections = { "a", "c" }
};
listBox.DataContext = itemsHolder;
var behaviors = Interaction.GetBehaviors(listBox);
behaviors.Add(behavior);
CollectionAssert.AreEquivalent(new[] { "a", "c" }, listBox.SelectedItems);
}
public void WhenDataContextChanges_ThenItupdatesSelectedItems()
{
var behavior = new SynchronizeSelectedItems();
BindingOperations.SetBinding(
behavior,
SynchronizeSelectedItems.SelectionsProperty,
new Binding("ObservableSelections"));
var listBox = new ListBox() { SelectionMode = SelectionMode.Multiple };
BindingOperations.SetBinding(
listBox, ListBox.ItemsSourceProperty,
new Binding("Items"));
listBox.DataContext =
new ItemsHolder
{
Items = { "a", "b", "c", "d" },
ObservableSelections = { "a", "c" }
};
var behaviors = Interaction.GetBehaviors(listBox);
behaviors.Add(behavior);
listBox.DataContext =
new ItemsHolder
{
Items = { "a", "b", "c", "d" },
ObservableSelections = { "b", "d" }
};
CollectionAssert.AreEquivalent(new[] { "b", "d" }, listBox.SelectedItems);
}
public void WhenSelectionsAreUpdatedOnTheObservableModelAfterDetachingTheBehavior_ThenSelectedItemsAreNotUpdatedOnTheListBox()
{
var behavior = new SynchronizeSelectedItems();
BindingOperations.SetBinding(
behavior,
SynchronizeSelectedItems.SelectionsProperty,
new Binding("ObservableSelections"));
var listBox = new ListBox()
{
SelectionMode = SelectionMode.Multiple
};
BindingOperations.SetBinding(
listBox, ListBox.ItemsSourceProperty,
new Binding("Items"));
var itemsHolder =
new ItemsHolder
{
Items = { "a", "b", "c", "d" },
ObservableSelections = { "a", "c" }
};
listBox.DataContext = itemsHolder;
var behaviors = Interaction.GetBehaviors(listBox);
behaviors.Add(behavior);
itemsHolder.ObservableSelections.Add("d");
behaviors.Remove(behavior);
itemsHolder.ObservableSelections.Remove("c");
CollectionAssert.AreEquivalent(new[] { "a", "c", "d" }, listBox.SelectedItems);
}
public void WhenSelectedItemsAreUpdatedOnTheListBox_ThenSelectionsAreUpdatedOnTheModel()
{
var behavior = new SynchronizeSelectedItems();
BindingOperations.SetBinding(
behavior,
SynchronizeSelectedItems.SelectionsProperty,
new Binding("ObservableSelections"));
var listBox = new ListBox() { SelectionMode = SelectionMode.Multiple };
BindingOperations.SetBinding(
listBox, ListBox.ItemsSourceProperty,
new Binding("Items"));
var itemsHolder =
new ItemsHolder
{
Items = { "a", "b", "c", "d" },
ObservableSelections = { "a", "c" }
};
listBox.DataContext = itemsHolder;
var behaviors = Interaction.GetBehaviors(listBox);
behaviors.Add(behavior);
listBox.SelectedItems.Add("d");
listBox.SelectedItems.Remove("c");
CollectionAssert.AreEquivalent(new[] { "a", "d" }, itemsHolder.ObservableSelections);
}