private void SubscribeToStateChanging(bool subscribe = true)
{
if (VisualTreeHelper.GetChildrenCount((DependencyObject)this._listScrollViewer) <= 0)
{
return;
}
FrameworkElement child = VisualTreeHelper.GetChild((DependencyObject)this._listScrollViewer, 0) as FrameworkElement;
if (child == null)
{
return;
}
VisualStateGroup visualState = MyVirtualizingPanel.FindVisualState(child, "ScrollStates");
if (visualState == null)
{
return;
}
if (subscribe)
{
visualState.CurrentStateChanging += (new EventHandler <VisualStateChangedEventArgs>(this.group_CurrentStateChanging));
}
else
{
visualState.CurrentStateChanging -= (new EventHandler <VisualStateChangedEventArgs>(this.group_CurrentStateChanging));
}
}
private void HookupScrollEvents()
{
if (this.ScrollViewer == null)
{
return;
}
FrameworkElement child = VisualTreeHelper.GetChild((DependencyObject)this.ScrollViewer, 0) as FrameworkElement;
if (child == null)
{
return;
}
VisualStateGroup visualState = MyVirtualizingPanel.FindVisualState(child, "VerticalCompression");
if (visualState == null)
{
return;
}
visualState.CurrentStateChanging += (new EventHandler <VisualStateChangedEventArgs>(this.vgroup_CurrentStateChanging));
}
