private object GetPreviousNavigationTarget()
{
var currentContent = this.Content;
if (NavigationTargets == null || NavigationTargets.Contains(currentContent) == false)
{
return(null);
}
var index = NavigationTargets.IndexOf(currentContent) - 1;
if (index < 0)
{
index = NavigationTargets.Count - 1;
}
return(NavigationTargets[index]);
}
private object GetNextNavigationTarget()
{
var currentContent = this.Content;
if (NavigationTargets == null || NavigationTargets.Contains(currentContent) == false)
{
return(null);
}
var index = NavigationTargets.IndexOf(currentContent) + 1;
if (index >= NavigationTargets.Count)
{
index = 0;
}
return(NavigationTargets[index]);
}