in WPF. How to scroll Objects in ScrollViewer by mouse-dragging, like as iPhone?

Question

it\'s done well to scroll by mouse-wheel or scrollbar seed-dragging. but scrolling by mouse-dragging contents on scroll view is not done. How can i implement this action?

Answer 1

This is how I did it, XAML:

C#:

private void sp_MouseMove(object sender, MouseEventArgs e)
    {
        Point newMousePosition = Mouse.GetPosition((StackPanel)sender);
        tb.Text = newMousePosition.X + " | " + newMousePosition.Y;

        if (Mouse.LeftButton == MouseButtonState.Pressed)
        {
            if (newMousePosition.Y < oldMousePosition.Y)
                sv.ScrollToVerticalOffset(sv.VerticalOffset + 1);
            if (newMousePosition.Y > oldMousePosition.Y)
                sv.ScrollToVerticalOffset(sv.VerticalOffset - 1);

            if (newMousePosition.X < oldMousePosition.X)
                sv.ScrollToHorizontalOffset(sv.HorizontalOffset + 1);
            if (newMousePosition.X > oldMousePosition.X)
                sv.ScrollToHorizontalOffset(sv.HorizontalOffset - 1);
        }
        else
        {
            oldMousePosition = newMousePosition;
        }
    }

where Point oldMousePosition; is a member of the window.