private void InvokeOnSynchronizedActiveAwareChildren(object item, Action <IActiveAware> invocation)
{
var dependencyObjectView = (DependencyObject)item;
if (dependencyObjectView == null)
{
return;
}
// We are assuming that any scoped region managers are attached directly to the view.
var regionManager = RegionManager.GetRegionManager(dependencyObjectView);
// If the view's RegionManager attached property is different from the region's RegionManager,
// then the view's region manager is a scoped region manager.
if (regionManager == null || regionManager == Region.RManager)
{
return;
}
var activeViews = regionManager.Regions.SelectMany(e => e.ActiveViews);
var syncActiveViews = activeViews.Where(ShouldSyncActiveState);
foreach (var syncActiveView in syncActiveViews)
{
MvvmHelpers.ViewAndViewModelAction(syncActiveView, invocation);
}
}
private void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
foreach (object item in e.NewItems)
{
void Invocation(IActiveAware activeAware) => activeAware.IsActive = true;
MvvmHelpers.ViewAndViewModelAction(item, (Action <IActiveAware>)Invocation);
InvokeOnSynchronizedActiveAwareChildren(item, Invocation);
}
}
else if (e.Action == NotifyCollectionChangedAction.Remove)
{
foreach (object item in e.OldItems)
{
void Invocation(IActiveAware activeAware) => activeAware.IsActive = false;
MvvmHelpers.ViewAndViewModelAction(item, (Action <IActiveAware>)Invocation);
InvokeOnSynchronizedActiveAwareChildren(item, Invocation);
}
}
// May need to handle other action values (reset, replace). Currently the ViewsCollection class does not raise CollectionChanged with these values.
}
/// <summary>
/// Configure <see cref="IDialogWindow"/> content.
/// </summary>
/// <param name="dialogName">The name of the dialog to show.</param>
/// <param name="window">The hosting window.</param>
/// <param name="parameters">The parameters to pass to the dialog.</param>
protected virtual void ConfigureDialogWindowContent(string dialogName, IDialogWindow window, IDialogParameters parameters)
{
var content = _containerExtension.Resolve <object>(dialogName);
if (content is not FrameworkElement dialogContent)
{
throw new NullReferenceException("A dialog's content must be a FrameworkElement");
}
MvvmHelpers.AutowireViewModel(dialogContent);
if (dialogContent.DataContext is not IDialogAware viewModel)
{
throw new NullReferenceException("A dialog's ViewModel must implement the IDialogAware interface");
}
ConfigureDialogWindowProperties(window, dialogContent, viewModel);
MvvmHelpers.ViewAndViewModelAction <IDialogAware>(viewModel, d => d.OnDialogOpened(parameters));
}
