public static extern IntPtr SendMessage(IntPtr hWnd, WindowsMessages windowsMessage, SysCommands sysCommand, IntPtr lParam);
public static extern bool EnableMenuItem(IntPtr hMenu, SysCommands uIDEnableItem, MenuFlags uEnable);
private void MouseEvent(IntPtr window, WINDOWINFO windowinfo, HitTestValues hitTest, WM message, WM ncMessage, IntPtr clientCursorPos, IntPtr screenCursorPos)
{
if (message == WM.LBUTTONDOWN || message == WM.MBUTTONDOWN || message == WM.RBUTTONDOWN)
{
var topParent = GetAncestor(window, GetAncestorFlags.GetRoot);
if (topParent != _lastWindow)
{
IntPtr result;
MouseActivate mouseActivateResult;
if (
SendMessageTimeout(window, (uint)WM.MOUSEACTIVATE, topParent,
MAKELPARAM((int)hitTest, (int)message),
SendMessageTimeoutFlags.SMTO_ABORTIFHUNG | SendMessageTimeoutFlags.SMTO_NORMAL, 100,
out result) != IntPtr.Zero &&
(((mouseActivateResult = (MouseActivate)result) == MouseActivate.MA_ACTIVATEANDEAT) ||
mouseActivateResult == MouseActivate.MA_NOACTIVATEANDEAT))
{
return;
}
NativeMethods.SetWindowPos(topParent, new IntPtr(HWND_TOPMOST), 0, 0, 0, 0,
SetWindowPosFlags.IgnoreMove | SetWindowPosFlags.IgnoreResize | SetWindowPosFlags.ShowWindow);
_lastWindow = topParent;
}
}
NativeMethods.PostMessage(new HandleRef(null, window), WM.SETCURSOR, window,
MAKELPARAM((int)hitTest, (int)message));
if (hitTest == HitTestValues.HTCLIENT)
{
NativeMethods.PostMessage(new HandleRef(null, window), message, (IntPtr)MK_LBUTTON, clientCursorPos);
return;
}
SysCommands command = 0;
switch (hitTest)
{
case HitTestValues.HTSYSMENU:
if (ncMessage == WM.NCLBUTTONDBLCLK)
{
command = SysCommands.SC_CLOSE;
}
else if (ncMessage == WM.NCRBUTTONUP || ncMessage == WM.NCLBUTTONDOWN)
{
command = (SysCommands)0xFFFF;
}
break;
case HitTestValues.HTMINBUTTON:
if (ncMessage == WM.NCLBUTTONUP)
{
if (((WindowStyles)windowinfo.dwStyle & WindowStyles.WS_MINIMIZEBOX) != 0)
{
command = SysCommands.SC_MINIMIZE;
}
}
else if (ncMessage == WM.NCRBUTTONUP)
{
command = (SysCommands)0xFFFF;
}
break;
case HitTestValues.HTMAXBUTTON:
if (ncMessage == WM.NCLBUTTONUP)
{
if (((WindowStyles)windowinfo.dwStyle & WindowStyles.WS_MAXIMIZEBOX) != 0)
{
command = ((WindowStyles)windowinfo.dwStyle & WindowStyles.WS_MAXIMIZE) == 0
? SysCommands.SC_MAXIMIZE
: SysCommands.SC_RESTORE;
}
}
else if (ncMessage == WM.NCRBUTTONUP)
{
command = (SysCommands)0xFFFF;
}
break;
case HitTestValues.HTCLOSE:
if (ncMessage == WM.NCLBUTTONUP)
{
command = SysCommands.SC_CLOSE;
}
else if (ncMessage == WM.NCRBUTTONUP)
{
command = (SysCommands)0xFFFF;
}
break;
case HitTestValues.HTHELP:
if (ncMessage == WM.NCLBUTTONUP)
{
command = SysCommands.SC_CONTEXTHELP;
}
else if (ncMessage == WM.NCRBUTTONUP)
{
command = (SysCommands)0xFFFF;
}
break;
case HitTestValues.HTMENU:
if (ncMessage == WM.NCLBUTTONDOWN)
{
NativeMethods.PostMessage(new HandleRef(null, window), (WM)VncMessage, (IntPtr)VMW_EXECUTE_MENU, IntPtr.Zero);
}
else if (ncMessage == WM.NCMOUSEMOVE)
{
NativeMethods.PostMessage(new HandleRef(null, window), (WM)VncMessage, (IntPtr)VMW_HILITE_MENU, IntPtr.Zero);
}
break;
case HitTestValues.HTCAPTION:
if (ncMessage == WM.NCLBUTTONDBLCLK)
{
NativeMethods.PostMessage(new HandleRef(null, window), ncMessage, (IntPtr)hitTest, clientCursorPos);
}
else if (ncMessage == WM.NCRBUTTONUP)
{
command = (SysCommands)0xFFFF;
}
break;
default:
NativeMethods.PostMessage(new HandleRef(null, window),
message,
(IntPtr)MK_LBUTTON, clientCursorPos);
NativeMethods.PostMessage(new HandleRef(null, window), ncMessage, (IntPtr)hitTest, screenCursorPos);
break;
}
if (command != 0)
{
if (command == (SysCommands)0xFFFF)
{
NativeMethods.PostMessage(new HandleRef(null, window), WM.CONTEXTMENU, (IntPtr)command, clientCursorPos);
}
else
{
NativeMethods.PostMessage(new HandleRef(null, window), WM.SYSCOMMAND, (IntPtr)command, clientCursorPos);
}
}
}
