/// <summary>
/// Load inking preference from file. A new one will be created none is loaded.
/// This method will also create drawing attributes to be used by ink canvas.
/// </summary>
/// <returns></returns>
public static async Task <InkingPreference> LoadDrawingPreference()
{
// Check drawing preference file
AppEventSource.Log.Debug("ViewerPage: Checking previously saved drawing preference...");
StorageFile file = await SuspensionManager.GetSavedFileAsync(INKING_PREFERENCE_FILENAME);
InkingPreference inkingPreference = await
SuspensionManager.DeserializeFromFileAsync(typeof(InkingPreference), file) as InkingPreference;
// Discard the inking preference if it is not the current version
if (inkingPreference != null && inkingPreference.version != InkingPreference.CURRENT_INKING_PREF_VERSION)
{
inkingPreference = null;
}
// Create drawing preference file if one was not loaded.
if (inkingPreference == null)
{
AppEventSource.Log.Debug("ViewerPage: No saved drawing preference loaded. Creating a new one...");
inkingPreference = new InkingPreference();
await inkingPreference.SaveAsync();
}
return(inkingPreference);
}