Question

I write a class Scope inherit UserControl. I use some Scope to draw some figures that have the same time stamp. So I want to scroll all Scope when I scroll one of them.
I think I just make OnScroll method static, but it’s not work.

What should I do?

Any advice is welcome.

Answer 1

I would have a CompositeScroll class with method AddScrollbar. This class suscribes to the OnScroll of each scrollbar you add and make the others change its position in there. Something like this:

public class CompositeScroll
{
    private List<Scrollbar> scrollbars = new List<Scrollbars>();

    public void AddScrollbar(Scrollbar scrollbar)
    {
        scrollbars.Add(scrollbar);
        scrollbar.OnScroll += OnScroll;
    }

    private void OnScroll(object sender, EventArgs e)
    {
        var current = (Scrollbar)sender;
        var scrollbarsToMove = scrollbars.Where(x => x != current);

        foreach(var scrollbar in scrollbarsToMove)
            scrollbar.Position = current.Position;
    }
}

public class MyForm : Form
{
    private CompositeScroll compositeScroll = new CompositeScroll();        

    public MyForm()
    {
        InitializeComponents();
        compositeScroll.AddScrollbar(scrollbar1);
        compositeScroll.AddScrollbar(scrollbar2);
        compositeScroll.AddScrollbar(scrollbar3);
        compositeScroll.AddScrollbar(scrollbar4);
    }
}

This is an idea, you can change the Scrollbar type with the one you are using that contains teh scrollbars (Maybe a plain old UserControl).

Hope it helps.