NavigationView.Collapsed Event
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Occurs when a node in the tree is collapsed.
This documentation applies to WinUI 2 for UWP (for WinUI in the Windows App SDK, see the Windows App SDK namespaces).
// Register
event_token Collapsed(TypedEventHandler const& handler) const;
// Revoke with event_token
void Collapsed(event_token const* cookie) const;
// Revoke with event_revoker
NavigationView::Collapsed_revoker Collapsed(auto_revoke_t, TypedEventHandler const& handler) const; public event TypedEventHandler Collapsed; Public Custom Event Collapsed As TypedEventHandler(Of NavigationView, NavigationViewItemCollapsedEventArgs) Event Type
Examples
The following example creates a hierarchical NavigationView and sets up an event handler for the Collapsed event called OnItemCollapsed. In this event handler, the last collapsed item's Content property is set to display in the CollapsedItemLabel TextBlock.
private void OnItemCollapsed(object sender, NavigationViewItemCollapsedEventArgs e)
{
var nvib = e.CollapsedItemContainer;
var name = "Last Collapsed: " + nvib.Content;
CollapsedItemLabel.Text = name;
}
Remarks
Analogous to TreeView.Collapse