private void OnNavigation(NavigationEventArgs args)
{
lock (_LockObject)
{
EndPoint contentEndPoint;
foreach (var oldView in args.OldViews)
{
if (_ContentEndPoints.TryGetValue(oldView, out contentEndPoint))
{
contentEndPoint.MetaContext = null;
_ContentEndPoints.Remove(oldView);
}
}
if (args.NewView == null)
{
_ContentEndPoints.Add(args.NewView, args.Destination);
}
}
}
private void PrepareRegionForChange(string regionName, EndPoint endPoint, object content)
{
var activeViewModels = GetActiveViewModels(regionName);
FrameworkElement dataContextHolder = null;
var args = new NavigationEventArgs(activeViewModels.ToList(), endPoint, content);
Navigating(this, args);
Logger.Instance.Log("Removing " + regionName + " Region content not for " + GetLog(endPoint));
foreach (var view in _RegionManager.Regions[regionName].Views.ToList())
{
if (view != content)
{
if (_DisposableViewStates.ContainsKey(view))
{
_DisposableViewStates[view].Dispose();
_DisposableViewStates.Remove(view);
}
dataContextHolder = view as FrameworkElement;
if (dataContextHolder != null)
{
dataContextHolder.DataContext = null;
}
_RegionManager.Regions[regionName].Remove(view);
}
}
activeViewModels.Clear();
}
private void Navigating(IMenuBarManager barManager, IViewNavigator navigator, NavigationEventArgs e)
{
Stack<Action> cleanup;
foreach (var owner in _CleanupsByOwner
.Where(kvp => kvp.Key != EndPoint.Root && kvp.Key != e.Destination)
.Select(kvp => kvp.Key)
.ToList())
{
cleanup = _CleanupsByOwner[owner];
while (cleanup.Count != 0)
{
cleanup.Pop()();
}
_CleanupsByOwner.Remove(owner);
}
}