private void RemoveStatusBarItems()
{
_statusInfoUpdateSubscription.Dispose();
_statusInfoUpdateSubscription = null;
Editor.StatusBarItemsRight.Remove(_statusInfo);
_statusInfo = null;
}
private void AddStatusBarItems()
{
_statusInfo = new TextEditorStatusViewModel {
IsVisible = false
};
Editor.StatusBarItemsRight.Insert(0, _statusInfo);
// Observe the IDocumentService.ActiveDocumentChanged event and show/hide our status info.
var documentService = _documentService;
_statusInfoUpdateSubscription =
Observable.FromEventPattern <EventArgs>(
h => documentService.ActiveDocumentChanged += h,
h => documentService.ActiveDocumentChanged -= h)
.Select(eventPattern => (IDocumentService)eventPattern.Sender)
.Select(ds => ds.ActiveDocument as TextDocument)
.Subscribe(textDocument => _statusInfo.IsVisible = (textDocument != null));
}