Question

Is there a way to explicitly capture a click on a TreeView item?

Currently, I’m in a position where a TV represents a sort of options menu for users. Ordinarily, I would just use the SelectedItemChanged event on the TV, but there is the possibility of a user re-clicking an item twice in a row which won’t raise this event. I considered the idea of putting an event listener on the stackpanel that contains the items in each node, but the problem is this event fires before a selected item changed on a node. So if you hit the stackpanel, you’ll get the event, but won’t be able to get the associated item. Any ideas on how to get out of this one?

Answer 1

You could handle MouseLeftButtonUp event for the TreeView.

private void treeView1_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
    var selectedItem = treeView1.SelectedItem;
}

[EDIT]

You can handle MouseLeftButtonDown, but SelectedItem will not be changed yet at that moment. What you can do is to access e.OriginalSource to find out what element was clicked. I checked the example below with a tree of <TreeViewItem />, so element was TextBlock. If you try the code below change the type casting according to your scenario.

public MainPage()
{
    InitializeComponent();
    treeView1.AddHandler(MouseLeftButtonDownEvent, new MouseButtonEventHandler(treeView1_MouseLeftButtonDown), true);
}

private void treeView1_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    var selectedElement = (TextBlock)e.OriginalSource;
}