public void Adding_Children_Should_Fire_OnAttachedToVisualTree()
{
var child2 = new TestVisual();
var child1 = new TestVisual { Child = child2 };
var root = new TestRoot();
var called1 = false;
var called2 = false;
child1.AttachedToVisualTree += (s, e) => called1 = true;
child2.AttachedToVisualTree += (s, e) => called2 = true;
root.Child = child1;
Assert.True(called1);
Assert.True(called2);
}
public void Removing_Children_Should_Fire_OnDetachedFromVisualTree()
{
var child2 = new TestVisual();
var child1 = new TestVisual { Child = child2 };
var root = new TestRoot();
var called1 = false;
var called2 = false;
root.Child = child1;
child1.DetachedFromVisualTree += (s, e) => called1 = true;
child2.DetachedFromVisualTree += (s, e) => called2 = true;
root.Child = null;
Assert.True(called1);
Assert.True(called2);
}
public void Adding_Already_Parented_Control_Should_Throw()
{
var root1 = new TestRoot();
var root2 = new TestRoot();
var child = new TestVisual();
root1.AddChild(child);
Assert.Throws<InvalidOperationException>(() => root2.AddChild(child));
Assert.Equal(0, root2.GetVisualChildren().Count());
}
