How to avoid flicker when adding controls to a panel?

[Ralf Abramowitsch]

Hi,

I've got a flickering-problem when I try to add controls to a panel
(with flow layout) at runtime.

My code executes the following steps:

public void BuildView()
{
...
// suspend layout to not perform layout each time an item is added
mFlowLayoutPanel.SuspendLayout();
// remove all elements from the panel:
mFlowLayoutPanel.Controls.Clear();

// in a loop I add new items to the panel:
foreach (... in ...)
{
Panel panel = new Panel();
// set size of the panel:
panel.Size = MaxSize; // MaxSize is a constant value
// then the color of the panel is set
panel.BackColor = Color.CornflowerBlue;

// after all the panel is added the the panel with the flow
layout
mFlowLayoutPanel.Controls.Add(panel);
}
mFlowLayoutPanel.ResumeLayout(true);
}

Every time the method BuildView() is called, the panels are
flickering.
What went wrong? I thought that SuspendLayout() and ResumeLayout()
will avoid that? How can I avoid flickering every time my panels are
added to the flow layout panel?

Thanks a lot for your answer in advance.

Best regards,
Ralf

 

[Kevin Spencer]

Check out this article from George Shepherd's Windows Forms FAQ:

http://www.syncfusion.com/faq/windowsforms/search/558.aspx

--
HTH,

Kevin Spencer
Microsoft MVP

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