/// <summary>
/// Preserves state associated with this page in case the application is suspended or the
/// page is discarded from the navigation cache. Values must conform to the serialization
/// requirements of <see cref="SuspensionManager.SessionState"/>.
/// </summary>
/// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
protected virtual void SaveState(Dictionary <String, Object> pageState)
{
if (this.DataContext != null && this.DataContext is IStateAware)
{
IStateAware state = (IStateAware)this.DataContext;
state.SaveState(pageState);
}
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="navigationParameter">The parameter value passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
/// </param>
/// <param name="pageState">A dictionary of state preserved by this page during an earlier
/// session. This will be null the first time a page is visited.</param>
protected virtual void LoadState(Object navigationParameter, Dictionary <String, Object> pageState)
{
if (this.DataContext != null && this.DataContext is IStateAware)
{
IStateAware state = (IStateAware)this.DataContext;
state.LoadState(navigationParameter, pageState);
}
}
private void Widgets_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
foreach (IWidget widget in e.NewItems)
{
IStateAware stateAware = widget as IStateAware;
if (stateAware != null)
{
stateAware.OnResume();
}
}
}
private void OnNavigationStart(object sender, NavigationEventArgs e)
{
if (e.SourceDescriptor.ViewName == "WidgetView")
{
foreach (IWidget widget in Target.Widgets)
{
IStateAware stateAware = widget as IStateAware;
if (stateAware != null)
{
stateAware.OnStop();
}
}
}
}
private void OnNavigationCompleted(object sender, NavigationEventArgs e)
{
if (e.TargetDescriptor.ViewName == "WidgetView")
{
foreach (IWidget widget in Target.Widgets)
{
IStateAware stateAware = widget as IStateAware;
if (stateAware != null)
{
stateAware.OnResume();
}
}
}
}
