CODEWITHSUNDEEP
c#winformsscrolluser-controlsflowlayoutpanel
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YouShallNotPass

Reputation: 21

Virtual paging user controls and programmatic scrolling in FlowLayoutPanel

I'm working on a FlowLayoutPanel that has the capability of loading hundreds/thousands of custom user controls, each having a PictureBox and many text fields/buttons. I was able to implement virtual paging as seen here which works wonderfully, but I had to make some adjustments. The scrollbar inside the FlowLayoutPanel kept disappearing when the data changed, so I had to create a scrollbar outside the FlowLayoutPanel.

The issue I'm running into is this - the scroll bar won't scroll via mouse wheel when my mouse is anywhere outside of it. I tried making a MouseHover event on the FlowLayoutPanel and setting the focus to my scrollbar, but that didn't work. Any ideas on how I could get the scrollbar to scroll anywhere on the form?

Here's the virtual paging event from the link that I implemented:

private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
    {
        int pageSize = flowLayoutPanel1.ClientSize.Height / 500;
        int v = Math.Min(userControlList.Count, vScrollBar1.Value);

        flowLayoutPanel1.SuspendLayout();
        flowLayoutPanel1.Controls.Clear();
        flowLayoutPanel1.Controls.AddRange(userControlList.Skip((v - 1) * pageSize)
                                                 .Take(pageSize + 1).ToArray());
        flowLayoutPanel1.ResumeLayout();
    }

Upvotes: 1

Views: 424

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