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#region 窗体缩放
const int WM_NCHITTEST = 0x0084;
const int HTLEFT = 10;//左边界
const int HTRIGHT = 11;//右边界
const int HTTOP = 12;//上边界
const int HTTOPLEFT = 13;//左上角
const int HTTOPRIGHT = 14;//右上角
const int HTBOTTOM = 15;//下边界
const int HTBOTTOMLEFT = 0x10;//左下角
const int HTBOTTOMRIGHT = 17;//右下角
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
switch (m.Msg)
{
case WM_NCHITTEST:
{
Point vPoint = new Point((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 <= 5)
{
if (vPoint.Y <= 5)
{
m.Result = (IntPtr)HTTOPLEFT;
}
else if (vPoint.Y >= ClientSize.Height - 5)
{
m.Result = (IntPtr)HTBOTTOMLEFT;
}
else
{
m.Result = (IntPtr)HTLEFT;
}
}
else if (vPoint.X >= ClientSize.Width - 5)
{
if (vPoint.Y <= 5)
{
m.Result = (IntPtr)HTTOPRIGHT;
}
else if (vPoint.Y >= ClientSize.Height - 5)
{
m.Result = (IntPtr)HTBOTTOMRIGHT;
}
else
{
m.Result = (IntPtr)HTRIGHT;
}
}
else if (vPoint.Y <= 5)
{
m.Result = (IntPtr)HTTOP;
}
else if (vPoint.Y >= ClientSize.Height - 5)
{
m.Result = (IntPtr)HTBOTTOM;
}
}
break;
}
}
}
#endregion
//减少闪烁
//SetStyle(ControlStyles.SupportsTransparentBackColor , true);
//SetStyle(ControlStyles.AllPaintingInWmPaint , true);
//SetStyle(ControlStyles.UserPaint , true);
//双缓冲
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
//this.Refresh();