public void AddMatch(string shellSegment, string userSegment, object node)
{
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
switch (node)
{
case ShellUriHandler.GlobalRouteItem globalRoute:
if (globalRoute.IsFinished)
{
_globalRouteMatches.Add(globalRoute.SourceRoute);
}
break;
case Shell shell:
if (shell == Shell)
{
return;
}
Shell = shell;
break;
case ShellItem item:
if (Item == item)
{
return;
}
Item = item;
break;
case ShellSection section:
if (Section == section)
{
return;
}
Section = section;
if (Item == null)
{
Item = Section.Parent as ShellItem;
_fullSegments.Add(Item.Route);
}
break;
case ShellContent content:
if (Content == content)
{
return;
}
Content = content;
if (Section == null)
{
Section = Content.Parent as ShellSection;
_fullSegments.Add(Section.Route);
}
if (Item == null)
{
Item = Section.Parent as ShellItem;
_fullSegments.Insert(0, Item.Route);
}
break;
}
if (Item?.Parent is Shell s)
{
Shell = s;
}
// if shellSegment == userSegment it means the implicit route is part of the request
if (Routing.IsUserDefined(shellSegment) || shellSegment == userSegment || shellSegment == NextSegment)
{
_matchedSegments.Add(shellSegment);
}
_fullSegments.Add(shellSegment);
}
static void SearchPath(
object node,
RouteRequestBuilder currentMatchedPath,
List <string> segments,
List <RouteRequestBuilder> possibleRoutePaths,
int depthToStart,
int myDepth = -1,
NodeLocation currentLocation = null,
bool ignoreGlobalRoutes = true)
{
if (node is GlobalRouteItem && ignoreGlobalRoutes)
{
return;
}
++myDepth;
currentLocation = currentLocation ?? new NodeLocation();
currentLocation.SetNode(node);
IEnumerable items = null;
if (depthToStart > myDepth)
{
items = GetItems(node);
if (items == null)
{
return;
}
foreach (var nextNode in items)
{
SearchPath(nextNode, null, segments, possibleRoutePaths, depthToStart, myDepth, currentLocation, ignoreGlobalRoutes);
}
return;
}
string shellSegment = GetRoute(node);
string userSegment = null;
if (currentMatchedPath == null)
{
userSegment = segments[0];
}
else
{
userSegment = currentMatchedPath.NextSegment;
}
if (userSegment == null)
{
return;
}
RouteRequestBuilder builder = null;
if (shellSegment == userSegment || Routing.IsImplicit(shellSegment))
{
if (currentMatchedPath == null)
{
builder = new RouteRequestBuilder(shellSegment, userSegment, node, segments);
}
else
{
builder = new RouteRequestBuilder(currentMatchedPath);
builder.AddMatch(shellSegment, userSegment, node);
}
if (!Routing.IsImplicit(shellSegment) || shellSegment == userSegment)
{
possibleRoutePaths.Add(builder);
}
}
items = GetItems(node);
if (items == null)
{
return;
}
foreach (var nextNode in items)
{
SearchPath(nextNode, builder, segments, possibleRoutePaths, depthToStart, myDepth, currentLocation, ignoreGlobalRoutes);
}
}
internal static List <RouteRequestBuilder> GenerateRoutePaths(Shell shell, Uri request, Uri originalRequest, bool enableRelativeShellRoutes)
{
var routeKeys = Routing.GetRouteKeys();
request = FormatUri(request, shell);
originalRequest = FormatUri(originalRequest, shell);
List <RouteRequestBuilder> possibleRoutePaths = new List <RouteRequestBuilder>();
if (!request.IsAbsoluteUri)
{
request = ConvertToStandardFormat(shell, request);
}
string localPath = request.LocalPath;
bool relativeMatch = false;
if (!originalRequest.IsAbsoluteUri &&
!originalRequest.OriginalString.StartsWith("//", StringComparison.Ordinal))
{
relativeMatch = true;
}
var segments = new List <string>(RetrievePaths(localPath));
var depthStart = 0;
if (segments[0] == shell?.Route)
{
segments.RemoveAt(0);
depthStart = 1;
}
else
{
depthStart = 0;
}
if (relativeMatch && shell?.CurrentItem != null)
{
var result = ProcessRelativeRoute(shell, routeKeys, segments, enableRelativeShellRoutes, originalRequest);
if (result.Count > 0)
{
return(result);
}
}
possibleRoutePaths.Clear();
SearchPath(shell, null, segments, possibleRoutePaths, depthStart);
var bestMatches = GetBestMatches(possibleRoutePaths);
if (bestMatches.Count > 0)
{
return(bestMatches);
}
bestMatches.Clear();
ExpandOutGlobalRoutes(possibleRoutePaths, routeKeys);
foreach (var possibleRoutePath in possibleRoutePaths)
{
if (possibleRoutePath.IsFullMatch)
{
continue;
}
var url = possibleRoutePath.PathFull;
var currentLocation = possibleRoutePath.GetNodeLocation();
if (currentLocation.Content == null)
{
continue;
}
var globalRouteMatches =
SearchForGlobalRoutes(
possibleRoutePath.RemainingSegments,
new ShellNavigationState(url, false).FullLocation,
currentLocation,
routeKeys);
if (globalRouteMatches.Count != 1)
{
continue;
}
var globalRouteMatch = globalRouteMatches[0];
while (possibleRoutePath.NextSegment != null)
{
var matchIndex = globalRouteMatch.SegmentsMatched.IndexOf(possibleRoutePath.NextSegment);
if (matchIndex < 0)
{
break;
}
possibleRoutePath.AddGlobalRoute(
globalRouteMatch.GlobalRouteMatches[matchIndex],
globalRouteMatch.SegmentsMatched[matchIndex]);
}
}
possibleRoutePaths = GetBestMatches(possibleRoutePaths);
if (possibleRoutePaths.Count == 0)
{
foreach (var routeKey in routeKeys)
{
if (routeKey == originalRequest.OriginalString)
{
var builder = new RouteRequestBuilder(routeKey, routeKey, null, new List <string>(1)
{
routeKey
});
return(new List <RouteRequestBuilder> {
builder
});
}
}
if (!relativeMatch)
{
foreach (var route in routeKeys)
{
var uri = ConvertToStandardFormat(shell, CreateUri(route));
if (uri.Equals(request))
{
#if NETSTANDARD2_0
var replaced = originalRequest.OriginalString.Replace("//", "");
#else
var replaced = originalRequest.OriginalString.Replace("//", "", StringComparison.Ordinal);
#endif
throw new Exception($"Global routes currently cannot be the only page on the stack, so absolute routing to global routes is not supported. For now, just navigate to: {replaced}");
}
}
}
}
return(possibleRoutePaths);
}
internal static Uri FormatUri(Uri path, Shell shell)
{
if (path.OriginalString.StartsWith("..", StringComparison.Ordinal) && shell?.CurrentState != null)
{
var pathAndQueryString = path.OriginalString.Split(new[] { '?' }, 2);
string pathPart = pathAndQueryString[0];
string queryString = (pathAndQueryString.Length > 1) ? $"?{pathAndQueryString[1]}" : String.Empty;
var pages = ShellNavigationManager.BuildFlattenedNavigationStack(shell);
List <string> restOfPath = new List <string>();
bool dotsAllParsed = false;
foreach (var p in pathPart.Split(_pathSeparators))
{
if (p != ".." || dotsAllParsed)
{
dotsAllParsed = true;
restOfPath.Add(p);
continue;
}
var lastPage = pages[pages.Count - 1];
if (lastPage == null)
{
break;
}
pages.Remove(lastPage);
List <string> buildUpPages = new List <string>();
foreach (var page in pages)
{
if (page == null)
{
continue;
}
var route = Routing.GetRoute(page);
buildUpPages.AddRange(CollapsePath(route, buildUpPages, false));
}
restOfPath = buildUpPages;
}
string[] shellRoutes = new[]
{
shell.CurrentItem.Route,
shell.CurrentItem.CurrentItem.Route,
shell.CurrentItem.CurrentItem.CurrentItem.Route,
};
restOfPath = CollapsePath(restOfPath.ToArray(), shellRoutes, true);
restOfPath.Insert(0, shell.CurrentItem.CurrentItem.CurrentItem.Route);
restOfPath.Insert(0, shell.CurrentItem.CurrentItem.Route);
restOfPath.Insert(0, shell.CurrentItem.Route);
var result = $"{String.Join(_pathSeparator, restOfPath)}{queryString}";
var returnValue = ConvertToStandardFormat("scheme", "host", null, new Uri(result, UriKind.Relative));
return(new Uri(FormatUri(returnValue.PathAndQuery), UriKind.Relative));
}
if (path.IsAbsoluteUri)
{
return(new Uri(FormatUri(path.OriginalString), UriKind.Absolute));
}
return(new Uri(FormatUri(path.OriginalString), UriKind.Relative));
}
public async Task GoToAsync(ShellNavigationParameters shellNavigationParameters)
{
if (shellNavigationParameters.PagePushing != null)
{
Routing.RegisterImplicitPageRoute(shellNavigationParameters.PagePushing);
}
var state = shellNavigationParameters.TargetState ?? new ShellNavigationState(Routing.GetRoute(shellNavigationParameters.PagePushing), false);
bool?animate = shellNavigationParameters.Animated;
bool enableRelativeShellRoutes = shellNavigationParameters.EnableRelativeShellRoutes;
ShellNavigatingEventArgs deferredArgs = shellNavigationParameters.DeferredArgs;
var navigationRequest = ShellUriHandler.GetNavigationRequest(_shell, state.FullLocation, enableRelativeShellRoutes, shellNavigationParameters: shellNavigationParameters);
bool isRelativePopping = ShellUriHandler.IsTargetRelativePop(shellNavigationParameters);
ShellNavigationSource source = CalculateNavigationSource(_shell, _shell.CurrentState, navigationRequest);
// If the deferredArgs are non null that means we are processing a delayed navigation
// so the user has indicated they want to go forward with navigation
// This scenario only comes up from UI iniated navigation (i.e. switching tabs)
if (deferredArgs == null)
{
var navigatingArgs = ProposeNavigation(source, state, _shell.CurrentState != null, animate ?? true);
if (navigatingArgs != null)
{
bool accept = !navigatingArgs.NavigationDelayedOrCancelled;
if (navigatingArgs.DeferredTask != null)
{
accept = await navigatingArgs.DeferredTask;
}
if (!accept)
{
return;
}
}
}
Routing.RegisterImplicitPageRoutes(_shell);
_accumulateNavigatedEvents = true;
var uri = navigationRequest.Request.FullUri;
var queryString = navigationRequest.Query;
var queryData = ParseQueryString(queryString);
ApplyQueryAttributes(_shell, queryData, false, false);
var shellItem = navigationRequest.Request.Item;
var shellSection = navigationRequest.Request.Section;
var currentShellSection = _shell.CurrentItem?.CurrentItem;
var nextActiveSection = shellSection ?? shellItem?.CurrentItem;
ShellContent shellContent = navigationRequest.Request.Content;
bool modalStackPreBuilt = false;
// If we're replacing the whole stack and there are global routes then build the navigation stack before setting the shell section visible
if (navigationRequest.Request.GlobalRoutes.Count > 0 &&
nextActiveSection != null &&
navigationRequest.StackRequest == NavigationRequest.WhatToDoWithTheStack.ReplaceIt)
{
modalStackPreBuilt = true;
bool?isAnimated = (nextActiveSection != currentShellSection) ? false : animate;
await nextActiveSection.GoToAsync(navigationRequest, queryData, isAnimated, isRelativePopping);
}
if (shellItem != null)
{
ApplyQueryAttributes(shellItem, queryData, navigationRequest.Request.Section == null, false);
bool navigatedToNewShellElement = false;
if (shellSection != null && shellContent != null)
{
ApplyQueryAttributes(shellContent, queryData, navigationRequest.Request.GlobalRoutes.Count == 0, isRelativePopping);
if (shellSection.CurrentItem != shellContent)
{
shellSection.SetValueFromRenderer(ShellSection.CurrentItemProperty, shellContent);
navigatedToNewShellElement = true;
}
}
if (shellSection != null)
{
ApplyQueryAttributes(shellSection, queryData, navigationRequest.Request.Content == null, false);
if (shellItem.CurrentItem != shellSection)
{
shellItem.SetValueFromRenderer(ShellItem.CurrentItemProperty, shellSection);
navigatedToNewShellElement = true;
}
}
if (_shell.CurrentItem != shellItem)
{
_shell.SetValueFromRenderer(Shell.CurrentItemProperty, shellItem);
navigatedToNewShellElement = true;
}
if (!modalStackPreBuilt && currentShellSection?.Navigation.ModalStack.Count > 0)
{
// - navigating to new shell element so just pop everything
// - or route contains no global route requests
if (navigatedToNewShellElement || navigationRequest.Request.GlobalRoutes.Count == 0)
{
// remove all non visible pages first so the transition just smoothly goes from
// currently visible modal to base page
if (navigationRequest.Request.GlobalRoutes.Count == 0)
{
for (int i = currentShellSection.Stack.Count - 1; i >= 1; i--)
{
currentShellSection.Navigation.RemovePage(currentShellSection.Stack[i]);
}
}
await currentShellSection.PopModalStackToPage(null, animate);
}
}
if (navigationRequest.Request.GlobalRoutes.Count > 0 && navigationRequest.StackRequest != NavigationRequest.WhatToDoWithTheStack.ReplaceIt)
{
// TODO get rid of this hack and fix so if there's a stack the current page doesn't display
await Device.InvokeOnMainThreadAsync(() =>
{
return(_shell.CurrentItem.CurrentItem.GoToAsync(navigationRequest, queryData, animate, isRelativePopping));
});
}
else if (navigationRequest.Request.GlobalRoutes.Count == 0 &&
navigationRequest.StackRequest == NavigationRequest.WhatToDoWithTheStack.ReplaceIt &&
currentShellSection?.Navigation?.NavigationStack?.Count > 1)
{
// TODO get rid of this hack and fix so if there's a stack the current page doesn't display
await Device.InvokeOnMainThreadAsync(() =>
{
return(_shell.CurrentItem.CurrentItem.GoToAsync(navigationRequest, queryData, animate, isRelativePopping));
});
}
}
else
{
await _shell.CurrentItem.CurrentItem.GoToAsync(navigationRequest, queryData, animate, isRelativePopping);
}
_accumulateNavigatedEvents = false;
// this can be null in the event that no navigation actually took place!
if (_accumulatedEvent != null)
{
HandleNavigated(_accumulatedEvent);
}
}
public static void ApplyQueryAttributes(Element element, IDictionary <string, string> query, bool isLastItem, bool isPopping)
{
string prefix = "";
if (!isLastItem)
{
var route = Routing.GetRoute(element);
if (string.IsNullOrEmpty(route) || Routing.IsImplicit(route))
{
return;
}
prefix = route + ".";
}
//if the lastItem is implicitly wrapped, get the actual ShellContent
if (isLastItem)
{
if (element is IShellItemController shellitem && shellitem.GetItems().FirstOrDefault() is ShellSection section)
{
element = section;
}
if (element is IShellSectionController shellsection && shellsection.GetItems().FirstOrDefault() is ShellContent content)
{
element = content;
}
if (element is ShellContent shellcontent && shellcontent.Content is Element e)
{
element = e;
}
}
if (!(element is BaseShellItem baseShellItem))
{
baseShellItem = element?.Parent as BaseShellItem;
}
//filter the query to only apply the keys with matching prefix
var filteredQuery = new Dictionary <string, string>(query.Count);
foreach (var q in query)
{
if (!q.Key.StartsWith(prefix, StringComparison.Ordinal))
{
continue;
}
var key = q.Key.Substring(prefix.Length);
if (key.Contains("."))
{
continue;
}
filteredQuery.Add(key, q.Value);
}
if (baseShellItem is ShellContent)
{
baseShellItem.ApplyQueryAttributes(MergeData(element, filteredQuery, isPopping));
}
else if (isLastItem)
{
element.SetValue(ShellContent.QueryAttributesProperty, MergeData(element, query, isPopping));
}
IDictionary <string, string> MergeData(Element shellElement, IDictionary <string, string> data, bool isPopping)
{
if (!isPopping)
{
return(data);
}
var returnValue = new Dictionary <string, string>(data);
var existing = (IDictionary <string, string>)shellElement.GetValue(ShellContent.QueryAttributesProperty);
if (existing == null)
{
return(data);
}
foreach (var datum in existing)
{
if (!returnValue.ContainsKey(datum.Key))
{
returnValue[datum.Key] = datum.Value;
}
}
return(returnValue);
}
}
