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Added low-level mouse hook to support mouse wheel on NT (>=SP3). 

Thanks to karsten for the patch used as a starting point.
This commit is contained in:
crs 2003-01-07 21:11:54 +00:00
parent f832bdaf12
commit 1fd7ce14f3
1 changed files with 106 additions and 43 deletions
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149
lib/platform/CSynergyHook.cpp
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@ -55,10 +55,11 @@ static HHOOK g_keyboard = NULL;
static HHOOK g_mouse = NULL; static HHOOK g_mouse = NULL;
static HHOOK g_cbt = NULL; static HHOOK g_cbt = NULL;
static HHOOK g_getMessage = NULL; static HHOOK g_getMessage = NULL;
static HANDLE g_keyHookThread = NULL; static HANDLE g_hookThreadLL = NULL;
static DWORD g_keyHookThreadID = 0; static DWORD g_hookThreadIDLL = 0;
static HANDLE g_keyHookEvent = NULL; static HANDLE g_hookEventLL = NULL;
static HHOOK g_keyboardLL = NULL; static HHOOK g_keyboardLL = NULL;
static HHOOK g_mouseLL = NULL;
static bool g_screenSaver = false; static bool g_screenSaver = false;
static bool g_relay = false; static bool g_relay = false;
static UInt32 g_zoneSides = 0; static UInt32 g_zoneSides = 0;
@ -162,7 +163,9 @@ mouseHook(int code, WPARAM wParam, LPARAM lParam)
{ {
// win2k and other systems supporting WM_MOUSEWHEEL in // win2k and other systems supporting WM_MOUSEWHEEL in
// the mouse hook are gratuitously different (and poorly // the mouse hook are gratuitously different (and poorly
// documented). // documented). if a low-level mouse hook is in place
// it should capture these events so we'll never see
// them.
switch (g_wheelSupport) { switch (g_wheelSupport) {
case kWheelModern: { case kWheelModern: {
const MOUSEHOOKSTRUCT* info = const MOUSEHOOKSTRUCT* info =
@ -342,12 +345,55 @@ keyboardLLHook(int code, WPARAM wParam, LPARAM lParam)
return CallNextHookEx(g_keyboardLL, code, wParam, lParam); return CallNextHookEx(g_keyboardLL, code, wParam, lParam);
} }
//
// low-level mouse hook -- this allows us to capture and handle mouse
// wheel events on all windows NT platforms from NT SP3 and up. this
// is both simpler than using the mouse hook but also supports windows
// windows NT which does not report mouse wheel events. we need to
// keep the mouse hook handling of mouse wheel events because the
// windows 95 family doesn't support low-level hooks.
//
static
LRESULT CALLBACK
mouseLLHook(int code, WPARAM wParam, LPARAM lParam)
{
if (code >= 0) {
if (g_relay) {
MSLLHOOKSTRUCT* info = reinterpret_cast<MSLLHOOKSTRUCT*>(lParam);
switch (wParam) {
case WM_MOUSEWHEEL:
// mouse wheel events are the same for entire NT family
// (>=SP3, prior versions have no low level hooks) for
// low-level mouse hook messages, unlike (regular) mouse
// hook messages which are gratuitously different on
// win2k and not sent at all for windows NT.
// forward message to our window
PostThreadMessage(g_threadID, SYNERGY_MSG_MOUSE_WHEEL,
HIWORD(info->mouseData), 0);
// discard event
return 1;
default:
// all other events are passed through
break;
}
}
}
return CallNextHookEx(g_mouseLL, code, wParam, lParam);
}
static static
DWORD WINAPI DWORD WINAPI
getKeyboardLLProc(void*) getLowLevelProc(void*)
{ {
// thread proc for low-level keyboard hook. this does nothing but // thread proc for low-level keyboard/mouse hooks. this does
// install the hook, process events, and uninstall the hook. // nothing but install the hook, process events, and uninstall
// the hook.
// force this thread to have a message queue // force this thread to have a message queue
MSG msg; MSG msg;
@ -360,13 +406,27 @@ getKeyboardLLProc(void*)
0); 0);
if (g_keyboardLL == NULL) { if (g_keyboardLL == NULL) {
// indicate failure and exit // indicate failure and exit
g_keyHookThreadID = 0; g_hookThreadIDLL = 0;
SetEvent(g_keyHookEvent); SetEvent(g_hookEventLL);
return 1;
}
// install low-level mouse hook
g_mouseLL = SetWindowsHookEx(WH_MOUSE_LL,
&mouseLLHook,
g_hinstance,
0);
if (g_mouseLL == NULL) {
// indicate failure and exit
UnhookWindowsHookEx(g_keyboardLL);
g_keyboardLL = NULL;
g_hookThreadIDLL = 0;
SetEvent(g_hookEventLL);
return 1; return 1;
} }
// ready // ready
SetEvent(g_keyHookEvent); SetEvent(g_hookEventLL);
// message loop // message loop
bool done = false; bool done = false;
@ -387,7 +447,9 @@ getKeyboardLLProc(void*)
} }
// uninstall hook // uninstall hook
UnhookWindowsHookEx(g_mouseLL);
UnhookWindowsHookEx(g_keyboardLL); UnhookWindowsHookEx(g_keyboardLL);
g_mouseLL = NULL;
g_keyboardLL = NULL; g_keyboardLL = NULL;
return 0; return 0;
@ -397,10 +459,10 @@ getKeyboardLLProc(void*)
static static
DWORD WINAPI DWORD WINAPI
getKeyboardLLProc(void*) getLowLevelProc(void*)
{ {
g_keyHookThreadID = 0; g_hookThreadIDLL = 0;
SetEvent(g_keyHookEvent); SetEvent(g_hookEventLL);
return 1; return 1;
} }
@ -506,10 +568,11 @@ init(DWORD threadID)
g_mouse = NULL; g_mouse = NULL;
g_cbt = NULL; g_cbt = NULL;
g_getMessage = NULL; g_getMessage = NULL;
g_keyHookThread = NULL; g_hookThreadLL = NULL;
g_keyHookThreadID = 0; g_hookThreadIDLL = 0;
g_keyHookEvent = NULL; g_hookEventLL = NULL;
g_keyboardLL = NULL; g_keyboardLL = NULL;
g_mouseLL = NULL;
g_screenSaver = false; g_screenSaver = false;
} }
@ -607,31 +670,31 @@ install()
// ignore failure; we just won't get mouse wheel messages // ignore failure; we just won't get mouse wheel messages
} }
// install low-level keyboard hook, if possible. since this hook // install low-level keyboard/mouse hooks, if possible. since these
// is called in the context of the installing thread and that // hook are called in the context of the installing thread and that
// thread must have a message loop but we don't want the caller's // thread must have a message loop but we don't want the caller's
// message loop to do the work, we'll fire up a separate thread // message loop to do the work, we'll fire up a separate thread
// just for the hook. note that low-level keyboard hooks are only // just for the hooks. note that low-level hooks are only available
// available on windows NT SP3 and above. // on windows NT SP3 and above.
g_keyHookEvent = CreateEvent(NULL, TRUE, FALSE, NULL); g_hookEventLL = CreateEvent(NULL, TRUE, FALSE, NULL);
if (g_keyHookEvent != NULL) { if (g_hookEventLL != NULL) {
g_keyHookThread = CreateThread(NULL, 0, &getKeyboardLLProc, 0, g_hookThreadLL = CreateThread(NULL, 0, &getLowLevelProc, 0,
CREATE_SUSPENDED, &g_keyHookThreadID); CREATE_SUSPENDED, &g_hookThreadIDLL);
if (g_keyHookThread != NULL) { if (g_hookThreadLL != NULL) {
// start the thread and wait for it to initialize // start the thread and wait for it to initialize
ResumeThread(g_keyHookThread); ResumeThread(g_hookThreadLL);
WaitForSingleObject(g_keyHookEvent, INFINITE); WaitForSingleObject(g_hookEventLL, INFINITE);
ResetEvent(g_keyHookEvent); ResetEvent(g_hookEventLL);
// the thread clears g_keyHookThreadID if it failed // the thread clears g_hookThreadIDLL if it failed
if (g_keyHookThreadID == 0) { if (g_hookThreadIDLL == 0) {
CloseHandle(g_keyHookThread); CloseHandle(g_hookThreadLL);
g_keyHookThread = NULL; g_hookThreadLL = NULL;
} }
} }
if (g_keyHookThread == NULL) { if (g_hookThreadLL == NULL) {
CloseHandle(g_keyHookEvent); CloseHandle(g_hookEventLL);
g_keyHookEvent = NULL; g_hookEventLL = NULL;
} }
} }
@ -644,14 +707,14 @@ uninstall(void)
assert(g_hinstance != NULL); assert(g_hinstance != NULL);
// uninstall hooks // uninstall hooks
if (g_keyHookThread != NULL) { if (g_hookThreadLL != NULL) {
PostThreadMessage(g_keyHookThreadID, WM_QUIT, 0, 0); PostThreadMessage(g_hookThreadIDLL, WM_QUIT, 0, 0);
WaitForSingleObject(g_keyHookThread, INFINITE); WaitForSingleObject(g_hookThreadLL, INFINITE);
CloseHandle(g_keyHookEvent); CloseHandle(g_hookEventLL);
CloseHandle(g_keyHookThread); CloseHandle(g_hookThreadLL);
g_keyHookEvent = NULL; g_hookEventLL = NULL;
g_keyHookThread = NULL; g_hookThreadLL = NULL;
g_keyHookThreadID = 0; g_hookThreadIDLL = 0;
} }
if (g_keyboard != NULL) { if (g_keyboard != NULL) {
UnhookWindowsHookEx(g_keyboard); UnhookWindowsHookEx(g_keyboard);