WinForm自定义标题栏(再续)

今天在网上找到看到一篇博客<<C#改变无边框窗体大小>>,说的是WinForm的FormBorderStyle=None时如何在运行时调整窗体的大小,我之前的做法是通过判断像素来调整鼠标的样式,然后在改变窗体的大小,这边文章说的是通过重载窗体默认的系统消息来实现该功能,文章非常好…

转载自:http://www.beijibear.com/article/10-09/cheongyuhin5.html

const intWM_NCHITTEST = 0x0084;
const intHTLEFT = 10;    //左边界

const intHTRIGHT = 11;   //右边界
const intHTTOP = 12; //上边界
const intHTTOPLEFT = 13; //左上角
const intHTTOPRIGHT = 14;    //右上角
const intHTBOTTOM = 15;  //下边界
const intHTBOTTOMLEFT = 0x10; //左下角
const intHTBOTTOMRIGHT = 17; //右下角

protected override voidWndProc(refMessagem)
{
    base.WndProc(refm);
    switch(m.Msg)
    {
        caseWM_NCHITTEST:
        {
            PointvPoint = newPoint((int)m.LParam & 0xFFFF,(int)m.LParam >> 16 & 0xFFFF);
            vPoint = PointToClient(vPoint);
            //判断：仅当当前窗体状态不是最大化时，相关鼠标事件生效
           if(this.WindowState != FormWindowState.Maximized)
            {
                if(vPoint.X < 10)
                {
                    if(vPoint.Y < 10)
                    {
                        m.Result = (IntPtr)HTTOPLEFT;
                    }
                    else if(vPoint.Y > this.Height - 10)
                    {
                        m.Result = (IntPtr)HTBOTTOMLEFT;
                    }
                    else
                   {
                        m.Result = (IntPtr)HTLEFT;
                    }
                }
                else if(vPoint.X > this.Width - 10)
                {
                    if(vPoint.Y < 10)
                    {
                        m.Result = (IntPtr)HTTOPRIGHT;
                    }
                    else if(vPoint.Y > this.Height - 10)
                    {
                        m.Result = (IntPtr)HTBOTTOMRIGHT;
                    }
                    else
                   {
                        m.Result = (IntPtr)HTRIGHT;
                    }
                }
                else if(10 < vPoint.X && vPoint.X < this.Width - 10)
                {
                    if(vPoint.Y < 10)
                    {
                        m.Result = (IntPtr)HTTOP;
                    }
                    else if(vPoint.Y > this.Height - 10)
                    {
                        m.Result = (IntPtr)HTBOTTOM;
                    }
                }
            }
            break;
        }
    }
}

将窗体的Padding中将所有的值，均设为1即可（或更大，只要不为0就行。当然，数值越大，也意味着窗体四周的“露白”越多，同时，在调整大小时，也会越容易被鼠标“捕捉”到。一般来说，窗体的左、右边框容易被捕捉