static void InvokeOnRegionManagerAwareElement(object item, Action <IRegionManagerAware> invocation)
{
var rmAwareItem = item as IRegionManagerAware;
if (rmAwareItem != null)
{
invocation(rmAwareItem);
}
var frameworkElement = item as FrameworkElement;
if (frameworkElement != null)
{
IRegionManagerAware rmAwareDataContext = frameworkElement.DataContext as IRegionManagerAware;
if (rmAwareDataContext != null)
{
var frameworkElementParent = frameworkElement.Parent as FrameworkElement;
if (frameworkElementParent != null)
{
var rmAwareDataContextParent = frameworkElementParent.DataContext as IRegionManagerAware;
if (rmAwareDataContextParent != null)
{
if (rmAwareDataContext == rmAwareDataContextParent)
{
return;
}
}
}
invocation(rmAwareDataContext);
}
}
}
static void InvokeOnRegionManagerAwareElement(object item, Action <IRegionManagerAware> invocation)
{
#if LOGGING
long startTicks = Log.Trace($"Enter", Common.LOG_CATEGORY);
#endif
// Want to support View and/or ViewModel first approaches
var rmAwareItem = item as IRegionManagerAware;
// ViewModel first approach
// Check if supports IRegionManagerAware
if (rmAwareItem != null)
{
invocation(rmAwareItem);
}
// View first approach
// If we get a View it will be a FrameworkElement in WPF
var frameworkElement = item as FrameworkElement;
if (frameworkElement != null)
{
IRegionManagerAware rmAwareDataContext = frameworkElement.DataContext as IRegionManagerAware;
if (rmAwareDataContext != null)
{
var frameworkElementParent = frameworkElement.Parent as FrameworkElement;
// If a view does not have a DataContext, i.e. a ViewModel, it will inherit DataContext of parent view
// Avoid setting RegionManager of parent view
if (frameworkElementParent != null)
{
var rmAwareDataContextParent = frameworkElementParent.DataContext as IRegionManagerAware;
if (rmAwareDataContextParent != null)
{
if (rmAwareDataContext == rmAwareDataContextParent)
{
// This View doesn't have a ViewModel.
// It is using ViewModel of Visible parent. Do not set.
return;
}
}
}
invocation(rmAwareDataContext);
}
}
#if LOGGING
Log.Trace($"Exit", Common.LOG_CATEGORY, startTicks);
#endif
}
private void RemoveScopedRegionManagerFromView(IModelVisualizer modelVisualizer)
{
IRegionManagerAware regionManagerAware = modelVisualizer.ViewModel as IRegionManagerAware;
if (regionManagerAware != null)
{
RegionManager.SetRegionManager(modelVisualizer.View, null);
}
}
private void RegisterScopedRegionManagerToView(IModelVisualizer modelVisualizer)
{
IRegionManagerAware regionManagerAware = modelVisualizer.ViewModel as IRegionManagerAware;
if (regionManagerAware != null)
{
RegionManager.SetRegionManager(modelVisualizer.View, regionManagerAware.RegionManager);
}
}
private static void InvokeOnRegionManagerAwareElement(object item, Action <IRegionManagerAware> invocation)
{
var regionManagerAwareItem = item as IRegionManagerAware;
if (regionManagerAwareItem != null)
{
invocation(regionManagerAwareItem);
}
FrameworkElement frameworkElement = item as FrameworkElement;
if (frameworkElement != null)
{
IRegionManagerAware regionManagerAwareDataContext = frameworkElement.DataContext as IRegionManagerAware;
if (regionManagerAwareDataContext != null)
{
invocation(regionManagerAwareDataContext);
}
}
}
static void InvokeOnRegionManagerAwareElement(object item, Action <IRegionManagerAware> invocation)
{
var rmAwareItem = item as IRegionManagerAware;
if (rmAwareItem != null)
{
invocation(rmAwareItem);
}
var frameworkElement = item as FrameworkElement;
if (frameworkElement != null)
{
IRegionManagerAware rmAwareDataContext = frameworkElement.DataContext as IRegionManagerAware;
if (rmAwareDataContext != null)
{
var frameworkElementParent = frameworkElement.Parent as FrameworkElement;
// If a view does not have a DataContext, i.e. a ViewModel, it will inherit DataContext of parent view
// Avoid setting RegionManager of parent view
if (frameworkElementParent != null)
{
var rmAwareDataContextParent = frameworkElementParent.DataContext as IRegionManagerAware;
if (rmAwareDataContextParent != null)
{
if (rmAwareDataContext == rmAwareDataContextParent)
{
// This View doesn't have a ViewModel. Using ViewModel
// of Visible parent.
return;
}
}
}
invocation(rmAwareDataContext);
}
}
}
private static void InvokeOnRegionManagerAwareElement(object item, Action <IRegionManagerAware> invocation)
{
var regionManagerAwareItem = item as IRegionManagerAware;
if (regionManagerAwareItem != null)
{
invocation(regionManagerAwareItem);
}
FrameworkElement frameworkElement = item as FrameworkElement;
if (frameworkElement != null)
{
IRegionManagerAware regionManagerAwareDataContext = frameworkElement.DataContext as IRegionManagerAware;
if (regionManagerAwareDataContext != null)
{
// If a view doesn't have a data context (view model) it will inherit the data context from the parent view.
// The following check is done to avoid setting the RegionManager property in the view model of the parent view by mistake.
var frameworkElementParent = frameworkElement.Parent as FrameworkElement;
if (frameworkElementParent != null)
{
var regionManagerAwareDataContextParent = frameworkElementParent.DataContext as IRegionManagerAware;
if (regionManagerAwareDataContextParent != null)
{
if (regionManagerAwareDataContext == regionManagerAwareDataContextParent)
{
// If all of the previous conditions are true, it means that this view doesn't have a view model
// and is using the view model of its visual parent.
return;
}
}
}
invocation(regionManagerAwareDataContext);
}
}
}
