WPF ViewBox zoom/size changed event

Question

I would like to detect changes of the zoom or size of the ViewBox so I can apply some custom logic on the controls inside of it.

Is it possible to do?

Answer 1

Try this code:

private void Viewbox_SizeChanged(object sender, SizeChangedEventArgs e)
{
    double initialWidth = 509.0;

    if (e.PreviousSize.Width > 0)
    {
        var factor = e.NewSize.Width / initialWidth;
        this.Title = (factor * 100).ToString();
    }
}

The value 509.0 is the width of my initial Window. Every time you resize the window, I calculate the % between the new width and the initial one. I suppose that you need to subscribe MouseLeftButtonUp to detect the end of each window resizing, so you can save the new width.