Handling scroll event on listview in c#

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You’ll have to add support to the ListView class so you can be notified about scroll events. Add a new class to your project and paste the code below. Compile. Drop the new listview control from the top of the toolbox onto your form. Implement a handler for the new Scroll event.

using System;
using System.Windows.Forms;

    class MyListView : ListView {
      public event ScrollEventHandler Scroll;
      protected virtual void OnScroll(ScrollEventArgs e) {
        ScrollEventHandler handler = this.Scroll;
        if (handler != null) handler(this, e);
      }
      protected override void WndProc(ref Message m) {
        base.WndProc(ref m);
        if (m.Msg == 0x115) { // Trap WM_VSCROLL
          OnScroll(new ScrollEventArgs((ScrollEventType)(m.WParam.ToInt32() & 0xffff), 0));
        }
      }
    }

Beware that the scroll position (ScrollEventArgs.NewValue) isn’t meaningful, it depends on the number of items in the ListView. I forced it to 0. Following your requirements, you want to watch for the ScrollEventType.EndScroll notification to know when the user stopped scrolling. Anything else helps you detect that the user started scrolling. For example:

ScrollEventType mLastScroll = ScrollEventType.EndScroll;

private void myListView1_Scroll(object sender, ScrollEventArgs e) {
  if (e.Type == ScrollEventType.EndScroll) scrollEnded();
  else if (mLastScroll == ScrollEventType.EndScroll) scrollStarted();
  mLastScroll = e.Type;
}

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