private Task StoreNavigationStack(StorageFolder folder)
{
// Create an object for storage of the navigation state
NavigationManagerState state = new NavigationManagerState();
// Enumerate all NavigationEntries in the navigation stack
foreach (NavigationEntry entry in NavigationStack)
{
// Save the page state
// TODO : Do this when navigating away from each page to save time when suspending
SavePageState(entry);
// Create an object for storage of this entry
NavigationEntryState entryState = new NavigationEntryState()
{
PageName = entry.PageName,
ArgumentsData = entry.ArgumentsData,
StateData = entry.StateData
};
state.NavigationStack.Add(entryState);
}
// Store the state using the IStorageManager
return(storageManager.StoreAsync(folder, STORAGE_FILENAME, state));
}
// *** Methods ***
public async Task <bool> RestoreNavigationStack()
{
// Retrieve a navigation stack from storage unless,
// (1) The NavigationStorageType is 'None'
// (2) Cannot find the navigation stack in storage
NavigationManagerState restoredState = null;
switch (NavigationStorageType)
{
case Navigation.NavigationStorageType.Local:
restoredState = await storageManager.RetrieveAsync <NavigationManagerState>(ApplicationData.Current.LocalFolder, STORAGE_FILENAME);
break;
case Navigation.NavigationStorageType.Roaming:
restoredState = await storageManager.RetrieveAsync <NavigationManagerState>(ApplicationData.Current.RoamingFolder, STORAGE_FILENAME);
break;
}
// If a navigation stack is available, then restore this
if (restoredState != null)
{
foreach (NavigationEntryState entryState in restoredState.NavigationStack.Reverse())
{
// Push the restored navigation entry onto the stack
NavigationStack.Push(new NavigationEntry(entryState.PageName, entryState.ArgumentsData, entryState.StateData));
}
// Display the last page in the stack
DisplayNavigationEntry(CurrentPage);
// Call NavigatedTo() on the restored page
CallNavigatedTo(CurrentPage, NavigationMode.Refresh);
// Return true to signal success
return(true);
}
// Otherwise navigate to the home page and return false
else
{
NavigateTo(HomePageName);
return(false);
}
}
private Task StoreNavigationStack(StorageFolder folder)
{
// Create an object for storage of the navigation state
NavigationManagerState state = new NavigationManagerState();
// Enumerate all NavigationEntries in the navigation stack
foreach (NavigationEntry entry in navigationStack)
{
// Save the page state
// TODO : Do this when navigating away from each page to save time when suspending
SavePageState(entry);
// Create an object for storage of this entry
NavigationEntryState entryState = new NavigationEntryState()
{
PageName = entry.PageName,
ArgumentsData = entry.ArgumentsData,
StateData = entry.StateData
};
state.NavigationStack.Add(entryState);
}
// Store the state using the IStorageManager
return storageManager.StoreAsync(folder, STORAGE_FILENAME, state);
}
