internal static List <string> CollapsePath(
string[] myRoute,
IEnumerable <string> currentRouteStack,
bool removeUserDefinedRoute)
{
var localRouteStack = currentRouteStack.ToList();
for (var i = localRouteStack.Count - 1; i >= 0; i--)
{
var route = localRouteStack[i];
if (Routing.IsImplicit(route) ||
(Routing.IsDefault(route) && removeUserDefinedRoute))
{
localRouteStack.RemoveAt(i);
}
}
var paths = myRoute.ToList();
// collapse similar leaves
int walkBackCurrentStackIndex = -1;
if (paths.Count > 0)
{
walkBackCurrentStackIndex = localRouteStack.IndexOf(paths[0]);
}
while (paths.Count > 1 && walkBackCurrentStackIndex >= 0)
{
if (localRouteStack.Count <= walkBackCurrentStackIndex)
{
break;
}
if (paths[0] == localRouteStack[walkBackCurrentStackIndex])
{
paths.RemoveAt(0);
}
else
{
break;
}
walkBackCurrentStackIndex++;
}
return(paths);
}
public static ShellNavigationState GetNavigationState(ShellItem shellItem, ShellSection shellSection, ShellContent shellContent, IReadOnlyList <Page> sectionStack, IReadOnlyList <Page> modalStack)
{
List <string> routeStack = new List <string>();
bool stackAtRoot = sectionStack == null || sectionStack.Count <= 1;
bool hasUserDefinedRoute =
(Routing.IsUserDefined(shellItem)) ||
(Routing.IsUserDefined(shellSection)) ||
(Routing.IsUserDefined(shellContent));
if (shellItem != null)
{
var shellItemRoute = shellItem.Route;
routeStack.Add(shellItemRoute);
if (shellSection != null)
{
var shellSectionRoute = shellSection.Route;
routeStack.Add(shellSectionRoute);
if (shellContent != null)
{
var shellContentRoute = shellContent.Route;
routeStack.Add(shellContentRoute);
}
if (!stackAtRoot)
{
for (int i = 1; i < sectionStack.Count; i++)
{
var page = sectionStack[i];
routeStack.AddRange(CollapsePath(Routing.GetRoute(page), routeStack, hasUserDefinedRoute));
}
}
if (modalStack != null && modalStack.Count > 0)
{
for (int i = 0; i < modalStack.Count; i++)
{
var topPage = modalStack[i];
routeStack.AddRange(CollapsePath(Routing.GetRoute(topPage), routeStack, hasUserDefinedRoute));
for (int j = 1; j < topPage.Navigation.NavigationStack.Count; j++)
{
routeStack.AddRange(CollapsePath(Routing.GetRoute(topPage.Navigation.NavigationStack[j]), routeStack, hasUserDefinedRoute));
}
}
}
}
}
if (routeStack.Count > 0)
{
routeStack.Insert(0, "/");
}
return(new ShellNavigationState(String.Join("/", routeStack), true));
List <string> CollapsePath(
string myRoute,
IEnumerable <string> currentRouteStack,
bool userDefinedRoute)
{
var localRouteStack = currentRouteStack.ToList();
for (var i = localRouteStack.Count - 1; i >= 0; i--)
{
var route = localRouteStack[i];
if (Routing.IsImplicit(route) ||
(Routing.IsDefault(route) && userDefinedRoute))
{
localRouteStack.RemoveAt(i);
}
}
var paths = myRoute.Split('/').ToList();
// collapse similar leaves
int walkBackCurrentStackIndex = localRouteStack.Count - (paths.Count - 1);
while (paths.Count > 1 && walkBackCurrentStackIndex >= 0)
{
if (paths[0] == localRouteStack[walkBackCurrentStackIndex])
{
paths.RemoveAt(0);
}
else
{
break;
}
walkBackCurrentStackIndex++;
}
return(paths);
}
}