void MenuItemViewModels_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
if (e.OldItems != null)
{
foreach (var item in e.OldItems)
{
var model = (item as MenuItemViewModel);
var view = _menuViewItems.FirstOrDefault(v => v.Key == model);
_contentCanvas.Children.Remove(view.Value);
_menuViewItems.Remove(view.Key);
updateRendering();
}
}
else if (e.NewItems != null)
{
foreach (var item in e.NewItems)
{
var menuItemView = new MenuItemView()
{
DataContext = (item as MenuItemViewModel)
};
var model = (item as MenuItemViewModel);
_menuViewItems.Add(model, menuItemView);
_contentCanvas.Children.Insert(0, menuItemView);
updateRendering();
}
}
}
void MenuView_DataContextChanged(FrameworkElement sender, Windows.UI.Xaml.DataContextChangedEventArgs e)
{
if (e.NewValue != null)
{
_menuViewItems.Clear();
_contentCanvas.Children.Clear();
var model = (e.NewValue as MenuViewModel);
model.PropertyChanged -= MenuViewModel_PropertyChanged;
model.PropertyChanged += MenuViewModel_PropertyChanged;
model.MenuItemViewModels.CollectionChanged -= MenuItemViewModels_CollectionChanged;
model.MenuItemViewModels.CollectionChanged += MenuItemViewModels_CollectionChanged;
model.Updated -= Model_Updated;
model.Updated += Model_Updated;
foreach (var item in model.MenuItemViewModels)
{
var menuItemView = new MenuItemView()
{
DataContext = item
};
if (model.IsDisplayed || item.IsAlwaysDisplayed)
{
menuItemView.Opacity = 1;
}
else
{
menuItemView.Opacity = 0;
}
_menuViewItems.Add(item, menuItemView);
_contentCanvas.Children.Add(menuItemView);
}
updateRendering();
}
}
