public void MeasureParentOnceTest()
{
TestTaskScheduler scheduler = (TestTaskScheduler)ApplicationHost.Current.TaskScheduler;
using (scheduler.DisableImmediateProcessing())
{
TestContainer parent = new TestContainer();
TestElement child = new TestElement
{
MeasureSize = new Size(100, 100),
ArrangeSize = new Size(100, 100),
};
parent.IsRootElement = true;
parent.Child = child;
parent.Measure(new Size(100, 100));
parent.Arrange(new Rect(0, 0, 200, 200));
scheduler.ProcessDueOperations();
Assert.AreEqual(1, parent.MeasureCount);
Assert.AreEqual(1, parent.ArrangeCount);
Assert.AreEqual(1, child.MeasureCount);
Assert.AreEqual(1, child.ArrangeCount);
Assert.IsTrue(parent.IsMeasureValid);
Assert.IsTrue(parent.IsArrangeValid);
Assert.IsTrue(child.IsMeasureValid);
Assert.IsTrue(child.IsArrangeValid);
}
}
public void MeasureInvisibleOnceOnlyTest()
{
TestTaskScheduler scheduler = (TestTaskScheduler)ApplicationHost.Current.TaskScheduler;
using (scheduler.DisableImmediateProcessing())
{
TestElement child = new TestElement {
MeasureSize = new Size(100, 100), ArrangeSize = new Size(100, 100)
};
TestContainer parent = new TestContainer {
IsRootElement = true
};
parent.Child = child;
parent.Measure(Size.Infinity);
parent.Arrange(new Rect(parent.DesiredSize));
Assert.AreEqual(1, parent.MeasureCount);
Assert.AreEqual(1, parent.ArrangeCount);
Assert.AreEqual(1, child.MeasureCount);
Assert.AreEqual(1, child.ArrangeCount);
Assert.AreEqual(new Size(100, 100), child.DesiredSize);
Assert.AreEqual(new Size(100, 100), parent.DesiredSize);
child.Visibility = Visibility.Collapsed;
scheduler.ProcessDueOperations();
Assert.AreEqual(2, parent.MeasureCount);
Assert.AreEqual(2, parent.ArrangeCount);
Assert.AreEqual(1, child.MeasureCount);
Assert.AreEqual(1, child.ArrangeCount);
Assert.AreEqual(Size.Zero, child.DesiredSize);
Assert.AreEqual(Size.Zero, parent.DesiredSize);
child.InvalidateMeasure();
child.InvalidateArrange();
scheduler.ProcessDueOperations();
Assert.AreEqual(2, parent.MeasureCount);
Assert.AreEqual(2, parent.ArrangeCount);
Assert.AreEqual(1, child.MeasureCount);
Assert.AreEqual(1, child.ArrangeCount);
parent.InvalidateMeasure();
parent.InvalidateArrange();
scheduler.ProcessDueOperations();
Assert.AreEqual(3, parent.MeasureCount);
Assert.AreEqual(3, parent.ArrangeCount);
Assert.AreEqual(1, child.MeasureCount);
Assert.AreEqual(1, child.ArrangeCount);
}
}