C# 改变无边框窗体尺寸大小的方法

时间:2021-10-07 23:09:01
const int HTLEFT = ;
const int HTRIGHT = ;
const int HTTOP = ;
const int HTTOPLEFT = ;
const int HTTOPRIGHT = ;
const int HTBOTTOM = ;
const int HTBOTTOMLEFT = 0x10;
const int HTBOTTOMRIGHT = ;
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case 0x0084:
base.WndProc(ref m);
Point vPoint = new Point((int)m.LParam & 0xFFFF,
(int)m.LParam >> & 0xFFFF);
vPoint = PointToClient(vPoint);
if (vPoint.X <= )
if (vPoint.Y <= )
m.Result = (IntPtr)HTTOPLEFT;
else if (vPoint.Y >= ClientSize.Height - )
m.Result = (IntPtr)HTBOTTOMLEFT;
else m.Result = (IntPtr)HTLEFT;
else if (vPoint.X >= ClientSize.Width - )
if (vPoint.Y <= )
m.Result = (IntPtr)HTTOPRIGHT;
else if (vPoint.Y >= ClientSize.Height - )
m.Result = (IntPtr)HTBOTTOMRIGHT;
else m.Result = (IntPtr)HTRIGHT;
else if (vPoint.Y <= )
m.Result = (IntPtr)HTTOP;
else if (vPoint.Y >= ClientSize.Height - )
m.Result = (IntPtr)HTBOTTOM;
break;
case 0x0201://鼠标左键按下的消息
m.Msg = 0x00A1;//更改消息为非客户区按下鼠标
m.LParam = IntPtr.Zero;//默认值
m.WParam = new IntPtr();//鼠标放在标题栏内
base.WndProc(ref m);
break;
default:
base.WndProc(ref m);
break;
}
}