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//========================================================================
// GLFW - An OpenGL framework
// File: win32_enable.c
// Platform: Windows
// API version: 2.6
// WWW: http://glfw.sourceforge.net
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Camilla Berglund
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include "internal.h"
//************************************************************************
//**** GLFW internal functions ****
//************************************************************************
//========================================================================
// _glfwLLKeyboardProc() - Low level keyboard callback function (used to
// disable system keys under Windows NT).
//========================================================================
LRESULT CALLBACK _glfwLLKeyboardProc( int nCode, WPARAM wParam,
LPARAM lParam )
{
BOOL syskeys = 0;
PKBDLLHOOKSTRUCT p;
// We are only looking for keyboard events - interpret lParam as a
// pointer to a KBDLLHOOKSTRUCT
p = (PKBDLLHOOKSTRUCT) lParam;
// If nCode == HC_ACTION, then we have a keyboard event
if( nCode == HC_ACTION )
{
switch( wParam )
{
case WM_KEYDOWN:
case WM_SYSKEYDOWN:
case WM_KEYUP:
case WM_SYSKEYUP:
// Detect: ALT+TAB, ALT+ESC, ALT+F4, CTRL+ESC,
// LWIN, RWIN, APPS (mysterious menu key)
syskeys = ( p->vkCode == VK_TAB &&
p->flags & LLKHF_ALTDOWN ) ||
( p->vkCode == VK_ESCAPE &&
p->flags & LLKHF_ALTDOWN ) ||
( p->vkCode == VK_F4 &&
p->flags & LLKHF_ALTDOWN ) ||
( p->vkCode == VK_ESCAPE &&
(GetKeyState(VK_CONTROL) & 0x8000)) ||
p->vkCode == VK_LWIN ||
p->vkCode == VK_RWIN ||
p->vkCode == VK_APPS;
break;
default:
break;
}
}
// Was it a system key combination (e.g. ALT+TAB)?
if( syskeys )
{
// Pass the key event to our window message loop
if( _glfwWin.Opened )
{
PostMessage( _glfwWin.Wnd, (UINT) wParam, p->vkCode, 0 );
}
// We've taken care of it - don't let the system know about this
// key event
return 1;
}
else
{
// It's a harmless key press, let the system deal with it
return CallNextHookEx( _glfwWin.KeyboardHook, nCode, wParam,
lParam );
}
}
//************************************************************************
//**** Platform implementation functions ****
//************************************************************************
//========================================================================
// _glfwPlatformEnableSystemKeys() - Enable system keys
// _glfwPlatformDisableSystemKeys() - Disable system keys
//========================================================================
void _glfwPlatformEnableSystemKeys( void )
{
BOOL bOld;
// Use different methods depending on operating system version
if( _glfwLibrary.Sys.WinVer >= _GLFW_WIN_NT4 )
{
if( _glfwWin.KeyboardHook != NULL )
{
UnhookWindowsHookEx( _glfwWin.KeyboardHook );
_glfwWin.KeyboardHook = NULL;
}
}
else
{
(void) SystemParametersInfo( SPI_SETSCREENSAVERRUNNING, FALSE,
&bOld, 0 );
}
}
void _glfwPlatformDisableSystemKeys( void )
{
BOOL bOld;
// Use different methods depending on operating system version
if( _glfwLibrary.Sys.WinVer >= _GLFW_WIN_NT4 )
{
// Under Windows NT, install a low level keyboard hook
_glfwWin.KeyboardHook = SetWindowsHookEx( WH_KEYBOARD_LL,
_glfwLLKeyboardProc,
_glfwLibrary.Instance,
0 );
}
else
{
// Under Windows 95/98/ME, fool Windows that a screensaver
// is running => prevents ALT+TAB, CTRL+ESC and CTRL+ALT+DEL
(void) SystemParametersInfo( SPI_SETSCREENSAVERRUNNING, TRUE,
&bOld, 0 );
}
}
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