Question

I have written an MDI application in C# under VS2010.

When I drag the thumb on the vertical scroll bar, the window does not move until the thumb is released.

Research has turned-up some things, but none of the information I have found so far has worked.

Does someone have some guidance on this issue? I want the window to scroll as I drag the thumb.

Chuck

Answer 1

“I want the window to scroll as I drag the thumb, the window does not
move until the thumb is released”

Set the Scroll Bar Property ScrollTrack = True

Edit:

Check the last example here:
http://www.pcreview.co.uk/forums/determine-scrolling-mdi-form-mdiclient-t1323005.html
its related to detecting scrolls to repaint child forms to avoid flickering

And please have a look what Hans Passant does here: Issue Related to Scrollbar in MDI Form in C#

psuedo code:

  protected override void WndProc(ref Message m)
        {
            try
            {

                switch (m.Msg)
                {
                    //Scolling progress and Completion will be triggered
                    case WM_HSCROLL:

                    case WM_VSCROLL:
                          //this doesn't work 
                          //this.VerticalScroll.Value = x;

                          //I haven't tested this but it should definately work:
                          //http://www.pinvoke.net/default.aspx/user32.setscrollpos