FormBorderStyle.None时，支持改变窗体大小

最新推荐文章于 2022-10-21 09:29:22 发布

转载最新推荐文章于 2022-10-21 09:29:22 发布 · 1.6k 阅读

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本文介绍了一种在FormBorderStyle设置为None的情况下，通过重写WndProc方法并捕获WM_NCHITTEST消息来实现窗体大小调整的方法。通过判断鼠标位置，可以识别到不同边缘进行调整。

转载自：http://blog.sina.com.cn/s/blog_ad0672d60101l0i0.html
//FormBorderStyle.None时，支持改变窗体大小
#region 支持改变窗体大小
private const int Guying_HTLEFT = 10;
private const int Guying_HTRIGHT = 11;
private const int Guying_HTTOP = 12;
private const int Guying_HTTOPLEFT = 13;
private const int Guying_HTTOPRIGHT = 14;
private const int Guying_HTBOTTOM = 15;
private const int Guying_HTBOTTOMLEFT = 0x10;
private const int Guying_HTBOTTOMRIGHT = 17;

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 >> 16 & 0xFFFF);
vPoint = PointToClient(vPoint);
if (vPoint.X <= 5)
if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOPLEFT;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_HTBOTTOMLEFT;
else
m.Result = (IntPtr)Guying_HTLEFT;
else if (vPoint.X >= ClientSize.Width - 5)
if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOPRIGHT;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_HTBOTTOMRIGHT;
else
m.Result = (IntPtr)Guying_HTRIGHT;
else if (vPoint.Y <= 5)
m.Result = (IntPtr)Guying_HTTOP;
else if (vPoint.Y >= ClientSize.Height - 5)
m.Result = (IntPtr)Guying_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(2);//鼠标放在标题栏内
base.WndProc(ref m);
break;
default:
base.WndProc(ref m);
break;
}
}
#endregion