private async Task ExecuteNavigationAction(PathResolution resolution)
{
var newFrames = (await FindNavigationFrames(resolution).ConfigureAwait(false)).ToList();
if (newFrames.Count > 0) {
PushCurrentFrameOntoStack();
}
foreach (var frame in newFrames) {
// make frame the new active frame
frame.Parent = _activeFrame;
_activeFrame = frame;
// activate the context
await frame.Context.Activate().ConfigureAwait(false);
}
}
private async Task<IEnumerable<NavigationFrame>> FindNavigationFrames(PathResolution resolution)
{
var additionalFrames = new List<NavigationFrame>();
// keep resolving for as long as we get new contexts
while (resolution != null) {
var context = await resolution.Execute().ConfigureAwait(false);
if (context == null) {
break;
}
// add a new navigation frame to represent the context
additionalFrames.Add(new NavigationFrame {
Context = context,
Path = resolution.MatchingPath
});
var excess = resolution.ExcessPath.LastOrDefault();
if (excess != null) {
// only part of the path was handled, so ask the new context if it can handle the rest
resolution = context.HandleNavigation(excess);
} else {
// the full path has been handled, so exit
break;
}
}
return additionalFrames;
}