private void Button_Click(object sender, RoutedEventArgs e)
{
// Check if Boo is right of Kevin
var theRightStuff = RelativePanel.GetRightOf(Stuart);
// We'll check for Boo, not Kevin
// The first call this returns the string "Kevin", only later it returns the Image "Kevin".
// Historic C#
// if (theRightStuff is Image && ((String)((Image)theRightStuff).Tag) == "Boo") //
// New C#
if ((theRightStuff as Image)?.Tag?.ToString() == "Boo")
{
// Remove Boo
RelativePanel.SetRightOf(Stuart, Kevin);
MinionPanel.Children.Remove((UIElement)theRightStuff);
}
else
{ // Insert Boo
var boo = new Image()
{
Source = new BitmapImage(new Uri("ms-appx:/Assets/Boo.png")),
Width = 300,
Tag = "Boo"
};
// Prepare Boo
RelativePanel.SetRightOf(boo, Kevin);
RelativePanel.SetAlignBottomWith(boo, Kevin);
// Add Boo
MinionPanel.Children.Add(boo);
// Link to Stuart
// Don't do this - it does not draw Boo (Stuart still has RightOf Kevin):
// RelativePanel.SetLeftOf(boo, Stuart);
// Override the graph edge:
RelativePanel.SetRightOf(Stuart, boo);
}
}
