public void Should_undo_redo_collection_removal()
{
var screen = new Screen();
var circle = new Circle();
screen.Add(circle);
m.Reset();
screen.Remove(circle);
UndoCount(1);
m.Undo();
Assert.AreSame(circle, screen.Shapes[0]);
m.Redo();
Assert.AreEqual(0, screen.Shapes.Count);
}
public void Should_throw_when_removing_non_existent_element()
{
var screen = new Screen();
screen.Remove(new Circle());
}
public void Should_undo_redo_collection_changes_in_explicit_batch()
{
var screen = new Screen();
m.BeginBatch();
try {
var circle = new Circle();
screen.Add(new Circle {Radius = 10});
screen.Add(circle);
screen.MoveToFront(1);
screen.Remove(circle);
} finally {
m.EndBatch();
}
Assert.AreEqual(1, screen.Shapes.Count);
UndoCount(1);
m.Undo();
Assert.AreEqual(0, screen.Shapes.Count);
}
public void Should_fire_collection_removal_event()
{
var screen = new Screen();
var circle = new Circle();
screen.Add(circle);
int count = 0;
m.Changed += (_, args) => {
Assert.AreEqual(typeof (ElementRemovalEvent<Circle>), args.Event.GetType());
Assert.AreSame(screen.Shapes, ((ElementRemovalEvent<Circle>)args.Event).Collection);
Assert.AreSame(circle, ((ElementRemovalEvent<Circle>)args.Event).Element);
Assert.AreEqual(0, ((ElementRemovalEvent<Circle>)args.Event).Index);
count++;
};
screen.Remove(circle);
m.Undo();
Assert.AreEqual(2, count);
}
