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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* 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>
#include <rfb_win32/LowLevelKeyEvents.h>
#include <rfb/Threading.h>
#include <rfb/LogWriter.h>
#include <list>
using namespace rfb;
using namespace win32;
static LogWriter vlog("LowLevelKeyEvents");
HHOOK hook = 0;
std::list<HWND> windows;
Mutex windowLock;
static bool filterKeyEvent(int vkCode) {
switch (vkCode) {
case VK_LWIN:
case VK_RWIN:
case VK_SNAPSHOT:
return true;
case VK_TAB:
if (GetAsyncKeyState(VK_MENU) & 0x8000)
return true;
case VK_ESCAPE:
if (GetAsyncKeyState(VK_MENU) & 0x8000)
return true;
if (GetAsyncKeyState(VK_CONTROL) & 0x8000)
return true;
}
return false;
}
LRESULT CALLBACK LowLevelKeyEventProc(int nCode,
WPARAM wParam,
LPARAM lParam) {
if (nCode >= 0) {
Lock l(windowLock);
HWND foreground = GetForegroundWindow();
std::list<HWND>::iterator i;
for (i=windows.begin(); i!=windows.end(); i++) {
if (*i == foreground) {
UINT msgType = wParam;
KBDLLHOOKSTRUCT* msgInfo = (KBDLLHOOKSTRUCT*)lParam;
if (filterKeyEvent(msgInfo->vkCode)) {
vlog.debug("filtered event %lx(%lu) %lu", msgInfo->vkCode, msgInfo->vkCode, msgType);
PostMessage(*i, wParam, msgInfo->vkCode, (msgInfo->scanCode & 0xff) << 16);
return 1;
}
}
}
}
return CallNextHookEx(hook, nCode, wParam, lParam);
}
bool rfb::win32::enableLowLevelKeyEvents(HWND hwnd) {
// *** return false; // *** THIS CODE IS EXPERIMENTAL, SO DISABLED BY DEFAULT!
Lock l(windowLock);
if (windows.empty() && !hook)
hook = SetWindowsHookEx(WH_KEYBOARD_LL, &LowLevelKeyEventProc, GetModuleHandle(0), 0);
if (hook)
windows.push_back(hwnd);
vlog.debug("enable %p -> %s", hwnd, hook ? "success" : "failure");
return hook != 0;
}
void rfb::win32::disableLowLevelKeyEvents(HWND hwnd) {
vlog.debug("disable %p", hwnd);
Lock l(windowLock);
windows.remove(hwnd);
if (windows.empty() && hook) {
UnhookWindowsHookEx(hook);
hook = 0;
}
}
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