public void FreezableBasicTest()
{
int resourcesChangedCount = 0;
object resourceValue;
Freezable freezable = new Freezable();
freezable.ResourcesChanged += (sender, e) => resourcesChangedCount++;
FrameworkElement element = new FrameworkElement();
element.DataContext = "data-context";
element.Resources = new ResourceDictionary();
element.Resources.Add("key1", "value1");
Assert.AreNotEqual("data-context", freezable.GetValue(FrameworkElement.DataContextProperty));
Assert.IsFalse(freezable.TryGetResource("key1", out resourceValue));
element.SetValue(ValueProperty, freezable);
Assert.AreEqual("data-context", freezable.GetValue(FrameworkElement.DataContextProperty));
Assert.AreEqual(1, resourcesChangedCount);
Assert.IsTrue(freezable.TryGetResource("key1", out resourceValue));
Assert.AreEqual("value1", resourceValue);
element.Resources.Add("key2", "value2");
Assert.AreEqual(2, resourcesChangedCount);
Assert.IsTrue(freezable.TryGetResource("key2", out resourceValue));
Assert.AreEqual("value2", resourceValue);
}
public void FreezableCollectionBasicTest()
{
int resources1ChangedCount = 0;
object resourceValue;
Freezable freezable1 = new Freezable();
freezable1.ResourcesChanged += (sender, e) => resources1ChangedCount++;
FreezableCollection <Freezable> freezableCollection = new FreezableCollection <Freezable> {
freezable1
};
FrameworkElement element = new FrameworkElement();
element.DataContext = "data-context";
element.Resources = new ResourceDictionary();
element.Resources.Add("key1", "value1");
Assert.IsNull(freezable1.GetValue(FrameworkElement.DataContextProperty));
Assert.IsFalse(freezable1.TryGetResource("key1", out resourceValue));
element.SetValue(ValueProperty, freezableCollection);
Assert.AreEqual("data-context", freezable1.GetValue(FrameworkElement.DataContextProperty));
Assert.AreEqual(2, resources1ChangedCount);
Assert.IsTrue(freezable1.TryGetResource("key1", out resourceValue));
Assert.AreEqual("value1", resourceValue);
Freezable freezable2 = new Freezable();
freezableCollection.Add(freezable2);
Assert.AreEqual("data-context", freezable2.GetValue(FrameworkElement.DataContextProperty));
Assert.IsTrue(freezable2.TryGetResource("key1", out resourceValue));
Assert.AreEqual("value1", resourceValue);
freezableCollection.Clear();
Assert.AreNotEqual("data-context", freezable1.GetValue(FrameworkElement.DataContextProperty));
Assert.AreNotEqual("data-context", freezable2.GetValue(FrameworkElement.DataContextProperty));
Assert.AreEqual(3, resources1ChangedCount);
Assert.IsFalse(freezable1.TryGetResource("key1", out resourceValue));
Assert.IsFalse(freezable2.TryGetResource("key1", out resourceValue));
}
private static void TryFreeze(Freezable freezable)
{
var bindingProperty = GetBindingProperty(freezable);
if (bindingProperty != null)
{
var bindingExpression = BindingOperations.GetBindingExpression(freezable, bindingProperty);
if (bindingExpression == null)
{
freezable.Changed += OnFreezableChanged;
return;
}
bindingExpression.UpdateTarget();
freezable.SetValue(bindingProperty, freezable.GetValue(bindingProperty));
BindingOperations.ClearAllBindings(freezable);
freezable.Freeze();
}
}
