C# – Why do the WinForms controls flicker and resize slowly

ccontrolsflickerresizewinforms

I'm making a program where I have a lot of panels and panels in panels.

I have a few custom drawn controls in these panels.

The resize function of 1 panel contains code to adjust the size and position of all controls in that panel.

Now as soon as I resize the program, the resize of this panel gets actived. This results in a lot of flickering of the components in this panel.

All user drawn controls are double buffered.

Can some one help me solve this problem?

Best Answer

To get rid of the flicker while resizing the win form, suspend the layout while resizing. Override the forms resizebegin/resizeend methods as below.

protected override void OnResizeBegin(EventArgs e) {
    SuspendLayout();
    base.OnResizeBegin(e);
}
protected override void OnResizeEnd(EventArgs e) {
    ResumeLayout();
    base.OnResizeEnd(e);
}

This will leave the controls intact (as they where before resizing) and force a redraw when the resize operation is completed.

Related Solutions

C# – WinForms – Does the Form.DoubleBuffered property influence controls placed on that form

From what I remember, no, double buffering does NOT carry over to child controls. You need to set it for each one individually. I'll google it and see if I can find a source to prove / disprove this...

EDIT: Found this: http://www.devnewsgroups.net/group/microsoft.public.dotnet.framework.windowsforms/topic17173.aspx

Just thought of a quick hack to get around this. Basically, use reflection to get the "DoubleBuffered" property, and then set it:

public static class Extensions
{
    public static void EnableDoubleBuferring(this Control control)
    {
        var property = typeof(Control).GetProperty("DoubleBuffered", BindingFlags.Instance | BindingFlags.NonPublic);
        property.SetValue(control, true, null);
    }
}

Then, in your form code, do something like this:

    public Form1()
    {
        InitializeComponent();
        this.DoubleBuffered = true;
        foreach (Control control in this.Controls)
        {
            control.EnableDoubleBuferring();
        }
    }

Sublime Text – duplicate line “ctrl+shift+d” not working

Check out @skuroda's FindKeyConflicts plugin, available through Package Control. You probably have another plugin installed that also uses CtrlShiftD as a shortcut, and FindKeyConflicts will help you find out which, so you can change it and keep Sublime's default.

Best Answer

Related Solutions

C# – WinForms – Does the Form.DoubleBuffered property influence controls placed on that form

Sublime Text – duplicate line “ctrl+shift+d” not working

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