private async void DeleteDownloads_OnClick(object sender, RoutedEventArgs e)
{
deleteDownloads.IsEnabled = false;
var ctx = new RisDbContext();
await ctx.DeleteDownloads();
MessengerHelper.Notify(MessengerHelper.DownloadsDeleted);
}
private async void DeleteHistory_OnClick(object sender, RoutedEventArgs e)
{
deleteHistory.IsEnabled = false;
var ctx = new RisDbContext();
await ctx.DeleteSearchHistory();
MessengerHelper.Notify(MessengerHelper.SearchHistoryDeleted);
}
protected override void SaveState(Dictionary <String, Object> pageState)
{
MessengerHelper.Unregister(this, MessengerHelper.SearchHistoryDeleted);
MessengerHelper.Unregister(this, MessengerHelper.DownloadsDeleted);
MessengerHelper.Unregister(this, MessengerHelper.DbLoadCompleted);
var state = ViewModel.SaveState();
state.SearchHistoryVerticalOffset = ScrollViewerHelpers.GetVerticalOffset(searchHistoryListView);
state.DownloadsVerticalOffset = ScrollViewerHelpers.GetVerticalOffset(downloadsListView);
string serializedState = SerializationHelper.SerializeToString(state);
pageState[Constants.MainPageState] = serializedState;
// OnNavigatedFrom would be called *before* SaveState (unless we call base. first), that's why we destroy the references here
DataContext = null;
ViewModel = null;
}
protected override void LoadState(Object navigationParameter, Dictionary <String, Object> pageState)
{
MessengerHelper.Register(this, MessengerHelper.SearchHistoryDeleted, SearchHistoryDeleted);
MessengerHelper.Register(this, MessengerHelper.DownloadsDeleted, DownloadsDeleted);
MessengerHelper.Register(this, MessengerHelper.DbLoadCompleted, DbLoadCompleted);
if (pageState != null && pageState.ContainsKey(Constants.MainPageState))
{
string serializedState = pageState[Constants.MainPageState].ToString();
var state = SerializationHelper.DeserializeFromString <MainPageState>(serializedState);
ViewModel.LoadState(state);
_historyVerticalOffset = state.SearchHistoryVerticalOffset;
_downloadsVerticalOffset = state.DownloadsVerticalOffset;
}
ViewModel.LoadSearchHistoryAsync(); // intentionally no await
ViewModel.LoadDownloadsAsync(); // intentionally no await
}