public void Attaching_Control_To_Tree_Invalidates_Parent_Measure()
{
var target = new Mock <ILayoutManager>();
var control = new Decorator();
var root = new LayoutTestRoot
{
Child = control,
LayoutManager = target.Object,
};
root.Measure(Size.Infinity);
root.Arrange(new Rect(root.DesiredSize));
Assert.True(control.IsMeasureValid);
root.Child = null;
root.Measure(Size.Infinity);
root.Arrange(new Rect(root.DesiredSize));
Assert.False(control.IsMeasureValid);
Assert.True(root.IsMeasureValid);
target.Invocations.Clear();
root.Child = control;
Assert.False(root.IsMeasureValid);
Assert.False(control.IsMeasureValid);
target.Verify(x => x.InvalidateMeasure(root), Times.Once());
}
public void Only_Calls_LayoutManager_InvalidateArrange_Once()
{
var target = new Mock <ILayoutManager>();
var control = new Decorator();
var root = new LayoutTestRoot
{
Child = control,
LayoutManager = target.Object,
};
root.Measure(Size.Infinity);
root.Arrange(new Rect(root.DesiredSize));
target.Invocations.Clear();
control.InvalidateArrange();
control.InvalidateArrange();
target.Verify(x => x.InvalidateArrange(control), Times.Once());
}