public void CreateRegionLocation(ERegionLocation regionLocation, ContentControl contentControl)
{
if (_Regions.FirstOrDefault(r => r.RegionLocation == regionLocation) != null)
{
throw new Exception($"Region location {regionLocation} already exists.");
}
_Regions.Add(new Region(regionLocation, contentControl));
}
public async Task ActivateRegionViewAsync(ERegionLocation regionLocation, string viewKey)
{
var region = _Regions.FirstOrDefault(r => r.RegionLocation == regionLocation);
if (region == null)
{
throw new Exception($"Region location {regionLocation} doesn't exist.");
}
if (!region.RegisteredViews.ContainsKey(viewKey))
{
throw new Exception($"View with key {viewKey} doesn't exist in region location {regionLocation}.");
}
await region.ContentControl.Dispatcher.RunAsync(
Windows.UI.Core.CoreDispatcherPriority.Normal, async() =>
{
var view = region.RegisteredViews[viewKey];
if (Equals(region.ContentControl.Content, view))
{
return;
}
await DeactivateRegionAsync(regionLocation);
var activationAwareView = view as IRegionActivationAware;
var activationAwareViewModel = view.DataContext as IRegionActivationAware;
if (activationAwareView != null)
{
await activationAwareView.OnBeforeActivatedAsync();
}
if (activationAwareViewModel != null)
{
await activationAwareViewModel?.OnBeforeActivatedAsync();
}
region.ContentControl.Content = view;
if (activationAwareView != null)
{
await activationAwareView.OnAfterActivatedAsync();
}
if (activationAwareViewModel != null)
{
await activationAwareViewModel.OnAfterActivatedAsync();
}
});
}
public async Task DeactivateRegionAsync(ERegionLocation regionLocation)
{
var region = _Regions.FirstOrDefault(r => r.RegionLocation == regionLocation);
if (region == null)
{
throw new Exception($"Region location {regionLocation} doesn't exist.");
}
await region.ContentControl.Dispatcher.RunAsync(
Windows.UI.Core.CoreDispatcherPriority.Normal, async() =>
{
var view = region.ContentControl.Content as FrameworkElement;
if (view == null)
{
return;
}
var activationAwareView = view as IRegionActivationAware;
var activationAwareViewModel = view.DataContext as IRegionActivationAware;
if (activationAwareView != null)
{
await activationAwareView?.OnBeforeDeactivatedAsync();
}
if (activationAwareViewModel != null)
{
await activationAwareViewModel?.OnBeforeDeactivatedAsync();
}
region.ContentControl.Content = null;
if (activationAwareView != null)
{
await activationAwareView?.OnAfterDeactivatedAsync();
}
if (activationAwareViewModel != null)
{
await activationAwareViewModel?.OnAfterDeactivatedAsync();
}
});
}
public string RegisterRegionView(ERegionLocation regionLocation, FrameworkElement view)
{
var region = _Regions.FirstOrDefault(r => r.RegionLocation == regionLocation);
if (region == null)
{
throw new Exception($"Region location {regionLocation} doesn't exist.");
}
string viewKey = $"{regionLocation}@{view.GetType().FullName}";
if (region.RegisteredViews.ContainsKey(viewKey))
{
throw new Exception($"View with key {viewKey} is already registered with region location {regionLocation}.");
}
region.RegisteredViews.Add(viewKey, view);
return(viewKey);
}
public Region(ERegionLocation location, ContentControl control)
{
RegionLocation = location;
ContentControl = control;
RegisteredViews = new Dictionary <string, FrameworkElement>();
}