protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case Win32.WM_SYSCOMMAND:
{
maximized = (int)m.WParam == Win32.SC_MAXIMIZE;
break;
}
case Win32.WM_SIZE:
{
maximized = (int)m.WParam == Win32.SIZE_MAXIMIZED;
break;
}
case Win32.WM_NCPAINT:
{
//break;
if (Dwm.CompositionEnabled)
{
//var v = 2;
//Dwm.SetWindowAttribute(Handle, 2, ref v, 4);
MARGINS margins = new MARGINS(1);
Dwm.ExtendFrameIntoClientArea(Handle, ref margins);
}
break;
}
case Win32.WM_NCCALCSIZE:
{
var r = (RECT)Marshal.PtrToStructure(m.LParam, typeof(RECT));
var max = WindowState == FormWindowState.Maximized;
if (max)
{
var x = Win32.GetSystemMetrics(Win32.SM_CXSIZEFRAME);
var y = Win32.GetSystemMetrics(Win32.SM_CYSIZEFRAME);
var p = Win32.GetSystemMetrics(Win32.SM_CXPADDEDBORDER);
var w = x + p;
var h = y + p;
r.left += w;
r.top += h;
r.right -= w;
r.bottom -= h;
var appBarData = new APPBARDATA();
appBarData.cbSize = Marshal.SizeOf(typeof(APPBARDATA));
var autohide = (Win32.SHAppBarMessage(Win32.ABM_GETSTATE, ref appBarData) & Win32.ABS_AUTOHIDE) != 0;
if (autohide)
{
r.bottom -= 1;
}
Marshal.StructureToPtr(r, m.LParam, true);
}
m.Result = IntPtr.Zero;
return;
}
case Win32.WM_NCHITTEST:
{
int x = m.LParam.ToInt32() & 0xFFFF;
int y = (m.LParam.ToInt32() >> 16) & 0xFFFF;
Point c = PointToClient(new Point(x, y));
x = c.X;
y = c.Y;
int result;
if (WindowState == FormWindowState.Maximized)
{
result = Win32.HTCAPTION;
}
else
{
if (x < BorderWidth)
{
if (y < BorderWidth)
{
result = Win32.HTTOPLEFT;
}
else if (y >= Height - BorderWidth)
{
result = Win32.HTBOTTOMLEFT;
}
else
{
result = Win32.HTLEFT;
}
}
else if (x >= Width - BorderWidth)
{
if (y < BorderWidth)
{
result = Win32.HTTOPRIGHT;
}
else if (y >= Height - BorderWidth)
{
result = Win32.HTBOTTOMRIGHT;
}
else
{
result = Win32.HTRIGHT;
}
}
else
{
if (y < BorderWidth)
{
result = Win32.HTTOP;
}
else if (y >= Height - BorderWidth)
{
result = Win32.HTBOTTOM;
}
else
{
result = Win32.HTCAPTION;
}
}
}
m.Result = new IntPtr(result);
return;
}
default: break;
}
base.WndProc(ref m);
}
[DllImport("dwmapi.dll", EntryPoint = "DwmExtendFrameIntoClientArea")] public static extern int ExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInset);