/// <summary>
/// Called when TabView source changes
/// </summary>
private void OnSourceChanged(TabView oldTabView, TabView newTabView)
{
if (oldTabView != null)
{
oldTabView.CurrentItemIndexChanged -= OnCurrentItemIndexChanged;
oldTabView.PanChanged -= OnPanChanged;
if (oldTabView.ItemsSource != null && oldTabView.ItemsSource is INotifyCollectionChanged)
{
(oldTabView.ItemsSource as INotifyCollectionChanged).CollectionChanged -= OnItemsSourceCollectionChanged;
}
}
if (newTabView != null)
{
newTabView.CurrentItemIndexChanged += OnCurrentItemIndexChanged;
newTabView.PanChanged += OnPanChanged;
if (newTabView.ItemsSource != null && newTabView.ItemsSource is INotifyCollectionChanged)
{
(newTabView.ItemsSource as INotifyCollectionChanged).CollectionChanged += OnItemsSourceCollectionChanged;
}
}
OnItemsSourceChanged(oldTabView != null ? oldTabView.ItemsSource : null, newTabView != null ? newTabView.ItemsSource : null);
OnCurrentItemIndexChanged(newTabView, newTabView.CurrentItemIndex);
}
private void OnContentChanged(object newContent)
{
if (newContent is View content)
{
// Remove old content from children
if (_contentElement != null && Children.Contains(_contentElement))
{
Children.Remove(_contentElement);
}
// Add new content to children
_contentElement = content;
Children.Insert(0, _contentElement);
// Remove TabView event listeners
if (_tabView != null)
{
_tabView.PanChanged -= OnTabViewPanChanged;
}
// Try find TabView from content
if (content != null)
{
_tabView = content as TabView;
if (_tabView == null)
{
_tabView = VisualTreeHelper.FindVisualChildren <TabView>(content).FirstOrDefault();
}
if (_tabView != null)
{
_tabView.PanChanged += OnTabViewPanChanged;
}
}
}
else if (_contentElement != null)
{
_contentElement.BindingContext = newContent;
}
}
