180 lines
4 KiB
C++
180 lines
4 KiB
C++
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#include "precomp.h"
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//
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// IM.CPP
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// Input Manager (controlling) Code
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//
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// Copyright(c) Microsoft 1997-
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//
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//
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// FUNCTION: OSI_InstallHighLevelMouseHook
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//
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// DESCRIPTION:
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//
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// This function installs the IM high level mouse hook. The mouse hook is
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// used to block remote mouse input to non-hosted apps.
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//
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// PARAMETERS: None.
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//
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//
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BOOL WINAPI OSI_InstallHighLevelMouseHook(BOOL fEnable)
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{
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BOOL rc = TRUE;
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DebugEntry(OSI_InstallHighLevelMouseHook);
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if (fEnable)
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{
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//
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// Check the hook is already installed. This is quite possible.
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//
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if (g_imMouseHook)
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{
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TRACE_OUT(( "Mouse hook installed already"));
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}
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else
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{
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//
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// Install the mouse hook
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//
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g_imMouseHook = SetWindowsHookEx(WH_MOUSE, IMMouseHookProc,
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g_hookInstance, 0);
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if (!g_imMouseHook)
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{
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ERROR_OUT(("Failed to install mouse hook"));
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rc = FALSE;
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}
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}
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}
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else
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{
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//
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// Check the hook is already removed. This is quite possible.
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//
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if (!g_imMouseHook)
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{
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TRACE_OUT(("Mouse hook not installed"));
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}
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else
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{
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//
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// Remove the mouse hook
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//
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UnhookWindowsHookEx(g_imMouseHook);
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g_imMouseHook = NULL;
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}
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}
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DebugExitBOOL(OSI_InstallHighLevelMouseHook, rc);
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return(rc);
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}
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//
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// FUNCTION: IMMouseHookProc
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//
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// DESCRIPTION:
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//
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//
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// PARAMETERS:
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//
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// See MouseProc documentation
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//
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// RETURNS:
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//
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// See MouseProc documentation (FALSE - allow event through, TRUE - discard
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// event)
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//
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//
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LRESULT CALLBACK IMMouseHookProc(int code,
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WPARAM wParam,
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LPARAM lParam)
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{
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LRESULT rc;
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BOOL block = FALSE;
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BOOL fShared;
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PMOUSEHOOKSTRUCT lpMseHook = (PMOUSEHOOKSTRUCT) lParam;
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DebugEntry(IMMouseHookProc);
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if (code < 0)
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{
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//
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// Pass the hook on if the code is negative (Windows hooking
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// protocol).
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//
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DC_QUIT;
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}
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//
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// Now decide if we should block this event. We will block this event
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// if it is not destined for a hosted window.
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//
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// Note that on NT screensavers run in a different desktop. We do not
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// journalrecord (and can't for winlogon/security reasons) on that
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// desktop and therefore never will see an HWND that is a screensaver.
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//
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fShared = HET_WindowIsHosted(lpMseHook->hwnd);
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if (wParam == WM_LBUTTONDOWN)
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g_fLeftDownOnShared = fShared;
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//
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// If this is some kind of mouse message to a window that isn't shared,
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// check if the window is the OLE32 dragdrop dude.
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//
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if (!fShared && g_fLeftDownOnShared)
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{
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TCHAR szName[HET_CLASS_NAME_SIZE];
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if (::GetClassName(lpMseHook->hwnd, szName, CCHMAX(szName)) &&
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!lstrcmpi(szName, HET_OLEDRAGDROP_CLASS) &&
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(::GetCapture() == lpMseHook->hwnd))
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{
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//
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// Note side-effect of this:
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// Mouse moves over non-shared areas when in OLE drag drop mode
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// WILL be passed on to non-shared window.
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//
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// But that's way better than it not working at all.
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//
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WARNING_OUT(("NMASNT: Hacking OLE drag drop; left click down on shared window then OLE took capture"));
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fShared = TRUE;
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}
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}
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block = !fShared;
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TRACE_OUT(("MOUSEHOOK: hwnd %08lx -> block: %s",
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lpMseHook->hwnd,
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block ? "YES" : "NO"));
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DC_EXIT_POINT:
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//
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// Call the next hook.
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//
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rc = CallNextHookEx(g_imMouseHook, code, wParam, lParam);
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if (block)
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{
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//
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// We want to block this event so return a non-zero value.
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//
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rc = 1;
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}
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DebugExitDWORD(IMMouseHookProc, (DWORD)rc);
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return(rc);
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}
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