private void ItemGridViewOnLoaded(object sender, RoutedEventArgs routedEventArgs)
{
if (_horizontalOffset != null)
{
ScrollViewerHelpers.ScrollToHorizontalOffset(itemGridView, _horizontalOffset.Value);
}
}
protected override void SaveState(Dictionary <String, Object> pageState)
{
DataTransferManager.GetForCurrentView().DataRequested -= OnDataRequested;
var state = ViewModel.SaveState();
double offset = ScrollViewerHelpers.GetHorizontalOffset(itemGridView);
state.GridViewHorizontalOffset = offset;
string serializedState = SerializationHelper.SerializeToString(state);
pageState[Constants.SearchResultsPageState] = serializedState;
}
// NOT IN USE BECAUSE: when returning from a search, a new item is added at the top, thus making the previous scroll position invalid
private void ScrollListViewsToSavedPosition()
{
// If the controls weren't loaded, accessing them will cause crashes
if (!_pastOnLoaded)
{
return;
}
if (null != _historyVerticalOffset && ViewModel.SearchHistory != null)
{
ScrollViewerHelpers.ScrollToVerticalOffset(searchHistoryListView, _historyVerticalOffset.Value);
}
if (null != _downloadsVerticalOffset && ViewModel.DownloadedDocuments != null)
{
ScrollViewerHelpers.ScrollToVerticalOffset(downloadsListView, _downloadsVerticalOffset.Value);
}
}
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;
}