public void RegionWillNotGetCreatedTwiceWhenThereAreMoreRegions()
{
var control1 = new MockFrameworkElement();
var control2 = new MockFrameworkElement();
var accessor = new MockRegionManagerAccessor
{
GetRegionName = d => d == control1 ? "Region1" : "Region2"
};
var adapter = new MockRegionAdapter();
adapter.Accessor = accessor;
var behavior1 = this.GetBehavior(control1, accessor, adapter);
var behavior2 = this.GetBehavior(control2, accessor, adapter);
behavior1.Attach();
behavior2.Attach();
accessor.UpdateRegions();
Assert.IsTrue(adapter.CreatedRegions.Contains("Region1"));
Assert.IsTrue(adapter.CreatedRegions.Contains("Region2"));
Assert.AreEqual(1, adapter.CreatedRegions.Count((name) => name == "Region2"));
}
private DelayedRegionCreationBehavior GetBehavior(DependencyObject control, MockRegionManagerAccessor accessor, MockRegionAdapter adapter)
{
var mappings = new RegionAdapterMappings();
mappings.RegisterMapping(control.GetType(), adapter);
var behavior = new DelayedRegionCreationBehavior(mappings);
behavior.RegionManagerAccessor = accessor;
behavior.TargetElement = control;
return behavior;
}
public void RegionGetsCreatedWhenAccessingRegions()
{
var control = new MockFrameworkElement();
var accessor = new MockRegionManagerAccessor
{
GetRegionName = d => "myRegionName"
};
var behavior = this.GetBehavior(control, accessor);
behavior.Attach();
accessor.UpdateRegions();
Assert.IsNotNull(RegionManager.GetObservableRegion(control).Value);
Assert.IsInstanceOfType(RegionManager.GetObservableRegion(control).Value, typeof(IRegion));
}
public void RegionDoesNotGetCreatedTwiceWhenUpdatingRegions()
{
var control = new MockFrameworkElement();
var accessor = new MockRegionManagerAccessor
{
GetRegionName = d => "myRegionName"
};
var behavior = this.GetBehavior(control, accessor);
behavior.Attach();
accessor.UpdateRegions();
IRegion region = RegionManager.GetObservableRegion(control).Value;
accessor.UpdateRegions();
Assert.AreSame(region, RegionManager.GetObservableRegion(control).Value);
}
private DelayedRegionCreationBehavior GetBehavior(DependencyObject control, MockRegionManagerAccessor accessor)
{
return GetBehavior(control, accessor, new MockRegionAdapter());
}
public void ShouldCleanupBehaviorOnceRegionIsCreated()
{
var control = new MockFrameworkElement();
var accessor = new MockRegionManagerAccessor
{
GetRegionName = d => "myRegionName"
};
var behavior = this.GetBehavior(control, accessor);
WeakReference behaviorWeakReference = new WeakReference(behavior);
behavior.Attach();
accessor.UpdateRegions();
Assert.IsTrue(behaviorWeakReference.IsAlive);
GC.KeepAlive(behavior);
behavior = null;
GC.Collect();
Assert.IsFalse(behaviorWeakReference.IsAlive);
}
public void BehaviorShouldUnhookEventWhenDetaching()
{
var control = new MockFrameworkElement();
var accessor = new MockRegionManagerAccessor
{
GetRegionName = d => "myRegionName",
};
var behavior = this.GetBehavior(control, accessor);
behavior.Attach();
int startingCount = accessor.GetSubscribersCount();
behavior.Detach();
Assert.AreEqual<int>(startingCount - 1, accessor.GetSubscribersCount());
}
public void BehaviorDoesNotPreventControlFromBeingGarbageCollectedWhenRegionWasCreated()
{
var control = new MockFrameworkElement();
WeakReference controlWeakReference = new WeakReference(control);
var accessor = new MockRegionManagerAccessor
{
GetRegionName = d => "myRegionName"
};
var behavior = this.GetBehavior(control, accessor);
behavior.Attach();
accessor.UpdateRegions();
Assert.IsTrue(controlWeakReference.IsAlive);
GC.KeepAlive(control);
control = null;
GC.Collect();
Assert.IsFalse(controlWeakReference.IsAlive);
}