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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2011 Pierre Ossman <ossman@cendio.se> for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <windows.h>
static HANDLE thread;
static DWORD thread_id;
static HHOOK hook = 0;
static HWND target_wnd = 0;
static int is_system_hotkey(int vkCode) {
switch (vkCode) {
case VK_LWIN:
case VK_RWIN:
case VK_SNAPSHOT:
return 1;
case VK_TAB:
if (GetAsyncKeyState(VK_MENU) & 0x8000)
return 1;
case VK_ESCAPE:
if (GetAsyncKeyState(VK_MENU) & 0x8000)
return 1;
if (GetAsyncKeyState(VK_CONTROL) & 0x8000)
return 1;
}
return 0;
}
static LRESULT CALLBACK keyboard_hook(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode >= 0) {
KBDLLHOOKSTRUCT* msgInfo = (KBDLLHOOKSTRUCT*)lParam;
// Grabbing everything seems to mess up some keyboard state that
// FLTK relies on, so just grab the keys that we normally cannot.
if (is_system_hotkey(msgInfo->vkCode)) {
PostMessage(target_wnd, wParam, msgInfo->vkCode,
(msgInfo->scanCode & 0xff) << 16 |
(msgInfo->flags & 0xff) << 24);
return 1;
}
}
return CallNextHookEx(hook, nCode, wParam, lParam);
}
static DWORD WINAPI keyboard_thread(LPVOID data)
{
MSG msg;
target_wnd = (HWND)data;
// Make sure a message queue is created
PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE | PM_NOYIELD);
hook = SetWindowsHookEx(WH_KEYBOARD_LL, keyboard_hook, GetModuleHandle(0), 0);
// If something goes wrong then there is not much we can do.
// Just sit around and wait for WM_QUIT...
while (GetMessage(&msg, NULL, 0, 0));
if (hook)
UnhookWindowsHookEx(hook);
target_wnd = 0;
return 0;
}
int win32_enable_lowlevel_keyboard(HWND hwnd)
{
// Only one target at a time for now
if (thread != NULL) {
if (hwnd == target_wnd)
return 0;
return 1;
}
// We create a separate thread as it is crucial that hooks are processed
// in a timely manner.
thread = CreateThread(NULL, 0, keyboard_thread, hwnd, 0, &thread_id);
if (thread == NULL)
return 1;
return 0;
}
void win32_disable_lowlevel_keyboard(HWND hwnd)
{
if (hwnd != target_wnd)
return;
PostThreadMessage(thread_id, WM_QUIT, 0, 0);
CloseHandle(thread);
thread = NULL;
}
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