protected virtual void OnProcessRequest(NavigationRequest request, Action <bool> requestCallback)
{
Guard.ArgumentNotNull(request, "request");
Guard.ArgumentNotNull(requestCallback, "requestCallback");
// if there is a pending request
if (ActiveNavigationRequest != null)
{
NavigationService.CancelNavigation(ActiveNavigationRequest);
ActiveNavigationRequest = null;
}
// we say we are navigating
var _cancelEventArgs = new NavigatingCancelEventArgs(this, request);
OnNavigating(_cancelEventArgs);
// if not cancelled, then we go to our base class to check against the ISupportNavigation
if (!_cancelEventArgs.Cancel)
{
NavigationService.ProcessNavigationLifecycle(request, this.CurrentNavigationLifecycleSupporter, this.CurrentNavigationViewLifecycleSupporter,
(b) =>
{
if (b)
{
ActiveNavigationRequest = request;
}
else
{
requestCallback(b);
}
},
() =>
{
TransitionToNavigationState(Controls.NavigationState.Navigating);
requestCallback(true);
});
}
else
{
requestCallback(false);
}
}