How to define an event handler of MouseLeftButtonDown of program generated Ellipse element of Canvas in WPF?

Question

How to define an event handler of MouseLeftButtonDown of program generated Ellipse element of Canvas in WPF? I have something like this:

canvas.Children.Add(new Ellipse(){
    Name = "FirstEllipse",
    Width = 150,
    Height = 100,
    Margin = new Thickness(200, 150, 0, 0),
    Fill = Brushes.Red,
    MouseLeftButtonDown = "Ellipse_MouseLeftButtonDown"
});

score 2 · Accepted Answer · answered Oct 02 '13 at 10:12

2

MouseLeftButtonDown is not a property but an event. You register a callback to the event using the += operator:

var e = new Ellipse { 
              Name = "FirstEllipse", 
              Width = 150, 
              Height = 100, 
              Margin = new Thickness(200, 150, 0, 0), 
              Fill = Brushes.Red };
e.MouseLeftButtonDown += Ellipse_MouseLeftButtonDown;
canvas.Children.Add(e);

answered Oct 02 '13 at 10:12

meilke

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And how can I refer specifically to this figure I clicked to change it`s, for example, color? – Corio Oct 02 '13 at 10:26
1

The handler has a sender parameter. That is the ellipse. – meilke Oct 02 '13 at 11:31
Can you give me an example of code. `sender.SetValue(Ellipse.FillProperty, Brushes.Aquamarine);` does not work – Corio Oct 03 '13 at 08:50
1

How about `((Ellipse)sender).Fill = Brushes.Aquamarine`? – meilke Oct 03 '13 at 10:11
Thanks, it helps much. I already figured it out, but your method is more beautiful. – Corio Oct 03 '13 at 10:58

How to define an event handler of MouseLeftButtonDown of program generated Ellipse element of Canvas in WPF?

1 Answers1