private static void HandleDisplay(FragmentContentViewer viewer, ViewModelFragment oldValue, ViewModelFragment newValue)
{
if (oldValue != null)
{
oldValue.Dispose();
}
if (newValue != null)
{
var viewType = FragmentManager.ResolveFragmentView(newValue.GetType());
if (viewType != null)
{
var view = Activator.CreateInstance(viewType) as FrameworkElement;
var newFragment = newValue as ViewModelFragment;
view.DataContext = newFragment;
newFragment.UI.SetUIElement(view, viewer);
viewer.PART_ContentPresenter.Content = view;
if (viewer.AutoInvoke)
{
newFragment.Invoke(viewer.DataContext as ViewModelBase, viewer.InvokeParameter);
}
}
}
else
{
viewer.PART_ContentPresenter.Content = null;
}
}
public static void SetHandleVisibilityChange(DependencyObject element, bool value)
{
element.SetValue(HandleVisibilityChangeProperty, value);
Grid control = element as Grid;
ViewModelFragment fragment = control.DataContext as ViewModelFragment;
if (value)
{
var key = element.RegisterPropertyChangedCallback(UIElement.VisibilityProperty, new DependencyPropertyChangedCallback((DependencyObject cont, DependencyProperty proper) =>
{
fragment.OnVisibilityChanged((Visibility)cont.GetValue(proper), null);
}));
element.SetValue(HandleVisibilityChange_HandlerProperty, key);
}
else
{
var key = (long)element.GetValue(HandleVisibilityChange_HandlerProperty);
element.UnregisterPropertyChangedCallback(UIElement.VisibilityProperty, key);
}
}
