private PageScope GetPageScope(Uri pageUri)
{
string pageName = pageUri.ToNormalizedString();
string prefix = "/Views/";
PageScope scope = PageScope.Unknown;
if (pageName.StartsWith(prefix + "InputPage.xaml") ||
pageName.StartsWith(prefix + "TaskPage.xaml") ||
pageName.StartsWith(prefix + "ThingPage.xaml"))
{
scope = PageScope.Game;
}
else if (pageName.StartsWith(prefix + "HomePage.xaml") ||
pageName.StartsWith(prefix + "CartridgeInfoPage.xaml") ||
pageName.StartsWith(prefix + "SettingsPage.xaml") ||
pageName.StartsWith(prefix + "HelpPage.xaml"))
{
scope = PageScope.App;
}
else if (pageName.StartsWith(prefix + "CompassCalibrationPage.xaml") ||
pageName.StartsWith(prefix + "GameHomePage.xaml") ||
pageName.StartsWith(prefix + "GameMapPage.xaml") ||
pageName.StartsWith(prefix + "PlayerPage.xaml"))
{
scope = PageScope.GameExtra;
}
else if (pageName.StartsWith(prefix + "BetaLicensePage.xaml") ||
pageName.StartsWith("/FileTypeAssociation"))
{
scope = PageScope.OneShot;
}
return(scope);
}
private void ConformBackStack(Uri latestNavigatedUri)
{
// What is the scope of the latest navigated Uri?
// Game -> Removes all non App entries before this one so that
// the page is the only Game page in the stack.
// (Wherigo spec)
// GameExtra -> Do not change anything.
// App -> Removes all entries up to and including the previous
// entry for this page only if the stack contains this.
// Others -> Do not change anything.
PageScope latestPageScope = _parent.GetPageScope(latestNavigatedUri);
if (latestPageScope == PageScope.App)
{
// If this is the home page, empties the whole back stack, in order
// to leave the home page as the root page of the app.
if (latestNavigatedUri.ToNormalizedString().StartsWith("/Views/HomePage.xaml"))
{
ClearBackStack();
}
// If the page Uri can be found in the back stack, clears entries up to and including the back stack.
else if (ClearBackStackFor(latestNavigatedUri))
{
_rootFrame.RemoveBackEntry();
}
}
else if (latestPageScope == PageScope.Game)
{
foreach (JournalEntry entry in _rootFrame.BackStack.ToList())
{
// Removes the current entry if it is a game entry.
if (_parent.GetPageScope(entry.Source) == PageScope.Game)
{
// Removes the entry.
_rootFrame.RemoveBackEntry();
}
else
{
// Stop right here, we hit an App entry.
break;
}
}
}
// If the top of the stack is a OneShot page, remove it
// now, since it may be the last time it's possible to do it.
JournalEntry topEntry = _rootFrame.BackStack.FirstOrDefault();
if (topEntry != null && _parent.GetPageScope(topEntry.Source) == PageScope.OneShot)
{
_rootFrame.RemoveBackEntry();
}
}
/// <summary>
/// Determines if a page name corresponds to a view of the game.
/// </summary>
/// <param name="pageUri"></param>
/// <returns></returns>
public bool IsGameViewUri(Uri pageUri)
{
PageScope scope = GetPageScope(pageUri);
return(scope == PageScope.Game || scope == PageScope.GameExtra);
}
