Capture mouse touch the title bar of win form

Question

i got some trick to capture mouse touch title bar but the routine fire repeatedly when i place mouse on title bar. here is the routine

protected override void WndProc(ref Message m)
{
            if (m.Msg == 0xA0) // WM_NCMOUSEMOVE
            {
        listBox1.Items.Add("mouse move on title bar");
            }
            else if (m.Msg == 0x2A2) // WM_NCMOUSELEAVE
            {
        listBox1.Items.Add("mouse leave from title bar");            
            }

            base.WndProc(ref m);
}

can any one tell me any trick as a result WndProc fire only once when mouse touch the title bar instead of repeatedly firing. thanks

Answer 1

Are you looking for this?I am controlling addition of items to listbox using flag.

private bool insideTitleBar = false;
private bool outsideTitleBar = false;

protected override void WndProc(ref Message m)
{
    if (m.Msg == 0xA0) // WM_NCMOUSEMOVE
    {        
           if(!insideTitleBar)
           {
            listBox1.Items.Add("mouse move on title bar");
            insideTitleBar = true;
            outsideTitleBar = false;
           }
    } 
    else if (m.Msg == 0x2A2) // WM_NCMOUSELEAVE
    {
           if(!outsideTitleBar)
           {      
            listBox1.Items.Add("mouse leave from title bar");            
            outsideTitleBar = true;
            insideTitleBar = false;
           }
    }
    base.WndProc(ref m);
}