MULTIMON.H
#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0500)
//=============================================================================
//
// MULTIMON
// stub module that fakes multiple monitor apis on pre Memphis Win32 OSes
//
// By using this header your code will work unchanged on Win95,
// you will get back default values from GetSystemMetrics() for new metrics
// and the new APIs will act like only one display is present.
//
// exactly one source must include this with COMPILE_MULTIMON_STUBS defined
//
//=============================================================================
#ifdef __cplusplus
extern "C" { /* Assume C declarations for C++ */
#endif /* __cplusplus */
//
// if we are building on Win95/NT4 headers we need to declare this stuff ourselves
//
#ifndef SM_CMONITORS
#define SM_XVIRTUALSCREEN 76
#define SM_YVIRTUALSCREEN 77
#define SM_CXVIRTUALSCREEN 78
#define SM_CYVIRTUALSCREEN 79
#define SM_CMONITORS 80
#define SM_SAMEDISPLAYFORMAT 81
DECLARE_HANDLE(HMONITOR);
#define MONITOR_DEFAULTTONULL 0x00000000
#define MONITOR_DEFAULTTOPRIMARY 0x00000001
#define MONITOR_DEFAULTTONEAREST 0x00000002
#define MONITORINFOF_PRIMARY 0x00000001
typedef struct tagMONITORINFO
{
DWORD cbSize;
RECT rcMonitor;
RECT rcWork;
DWORD dwFlags;
} MONITORINFO, *LPMONITORINFO;
#define CCHDEVICENAME 32
#ifdef __cplusplus
typedef struct tagMONITORINFOEX : public tagMONITORINFO
{
TCHAR szDevice[CCHDEVICENAME];
} MONITORINFOEX, *LPMONITORINFOEX;
#else
typedef struct
{
MONITORINFO;
TCHAR szDevice[CCHDEVICENAME];
} MONITORINFOEX, *LPMONITORINFOEX;
#endif
typedef BOOL (CALLBACK* MONITORENUMPROC)(HMONITOR, HDC, LPRECT, LPARAM);
#endif // SM_CMONITORS
#undef GetMonitorInfo
#undef GetSystemMetrics
#undef MonitorFromWindow
#undef MonitorFromRect
#undef MonitorFromPoint
#undef EnumDisplayMonitors
//
// define this to compile the stubs
// otherwise you get the declarations
//
#ifdef COMPILE_MULTIMON_STUBS
//-----------------------------------------------------------------------------
//
// Implement the API stubs.
//
//-----------------------------------------------------------------------------
int (WINAPI* g_pfnGetSystemMetrics)(int);
HMONITOR (WINAPI* g_pfnMonitorFromWindow)(HWND, BOOL);
HMONITOR (WINAPI* g_pfnMonitorFromRect)(LPCRECT, BOOL);
HMONITOR (WINAPI* g_pfnMonitorFromPoint)(POINT, BOOL);
BOOL (WINAPI* g_pfnGetMonitorInfo)(HMONITOR, LPMONITORINFO);
BOOL (WINAPI* g_pfnEnumDisplayMonitors)(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
BOOL InitMultipleMonitorStubs(void)
{
HMODULE hUser32;
static BOOL fInitDone;
if (fInitDone)
{
return g_pfnGetMonitorInfo != NULL;
}
if ((hUser32 = GetModuleHandle(TEXT("USER32"))) &&
(*(FARPROC*)&g_pfnGetSystemMetrics = GetProcAddress(hUser32,"GetSystemMetrics")) &&
(*(FARPROC*)&g_pfnMonitorFromWindow = GetProcAddress(hUser32,"MonitorFromWindow")) &&
(*(FARPROC*)&g_pfnMonitorFromRect = GetProcAddress(hUser32,"MonitorFromRect")) &&
(*(FARPROC*)&g_pfnMonitorFromPoint = GetProcAddress(hUser32,"MonitorFromPoint")) &&
(*(FARPROC*)&g_pfnEnumDisplayMonitors = GetProcAddress(hUser32,"EnumDisplayMonitors")) &&
#ifdef UNICODE
(*(FARPROC*)&g_pfnGetMonitorInfo = GetProcAddress(hUser32,"GetMonitorInfoW")) &&
#else
(*(FARPROC*)&g_pfnGetMonitorInfo = GetProcAddress(hUser32,"GetMonitorInfoA")) &&
#endif
//
// Old builds of Memphis had different indices for these metrics, and
// some of the APIs and structs have changed since then, so validate that
// the returned metrics are not totally stupid. (for example on an old
// Memphis build, the new index for SM_CYVIRTUALSCREEN will fetch 0)
//
// If this is preventing you from using the shell on secondary monitors
// under Memphis then upgrade to a new Memphis build that is in sync with
// the current version of the multi-monitor APIs.
//
(GetSystemMetrics(SM_CXVIRTUALSCREEN) >= GetSystemMetrics(SM_CXSCREEN)) &&
(GetSystemMetrics(SM_CYVIRTUALSCREEN) >= GetSystemMetrics(SM_CYSCREEN)) )
{
fInitDone = TRUE;
return TRUE;
}
else
{
g_pfnGetSystemMetrics = NULL;
g_pfnMonitorFromWindow = NULL;
g_pfnMonitorFromRect = NULL;
g_pfnMonitorFromPoint = NULL;
g_pfnGetMonitorInfo = NULL;
g_pfnEnumDisplayMonitors = NULL;
fInitDone = TRUE;
return FALSE;
}
}
//-----------------------------------------------------------------------------
//
// fake implementations of Monitor APIs that work with the primary display
// no special parameter validation is made since these run in client code
//
//-----------------------------------------------------------------------------
int WINAPI
xGetSystemMetrics(int nIndex)
{
if (InitMultipleMonitorStubs())
return g_pfnGetSystemMetrics(nIndex);
switch (nIndex)
{
case SM_CMONITORS:
case SM_SAMEDISPLAYFORMAT:
return 1;
case SM_XVIRTUALSCREEN:
case SM_YVIRTUALSCREEN:
return 0;
case SM_CXVIRTUALSCREEN:
nIndex = SM_CXSCREEN;
break;
case SM_CYVIRTUALSCREEN:
nIndex = SM_CYSCREEN;
break;
}
return GetSystemMetrics(nIndex);
}
#define xPRIMARY_MONITOR ((HMONITOR)0x42)
HMONITOR WINAPI
xMonitorFromRect(LPCRECT lprcScreenCoords, UINT uFlags)
{
if (InitMultipleMonitorStubs())
return g_pfnMonitorFromRect(lprcScreenCoords, uFlags);
if ((uFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) ||
((lprcScreenCoords->right > 0) &&
(lprcScreenCoords->bottom > 0) &&
(lprcScreenCoords->left < GetSystemMetrics(SM_CXSCREEN)) &&
(lprcScreenCoords->top < GetSystemMetrics(SM_CYSCREEN))))
{
return xPRIMARY_MONITOR;
}
return NULL;
}
HMONITOR WINAPI
xMonitorFromPoint(POINT ptScreenCoords, UINT uFlags)
{
if (InitMultipleMonitorStubs())
return g_pfnMonitorFromPoint(ptScreenCoords, uFlags);
if ((uFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST)) ||
((ptScreenCoords.x >= 0) &&
(ptScreenCoords.x < GetSystemMetrics(SM_CXSCREEN)) &&
(ptScreenCoords.y >= 0) &&
(ptScreenCoords.y < GetSystemMetrics(SM_CYSCREEN))))
{
return xPRIMARY_MONITOR;
}
return NULL;
}
HMONITOR WINAPI
xMonitorFromWindow(HWND hWnd, UINT uFlags)
{
RECT rc;
if (InitMultipleMonitorStubs())
return g_pfnMonitorFromWindow(hWnd, uFlags);
if (uFlags & (MONITOR_DEFAULTTOPRIMARY | MONITOR_DEFAULTTONEAREST))
return xPRIMARY_MONITOR;
if (GetWindowRect(hWnd, &rc))
return xMonitorFromRect(&rc, uFlags);
return NULL;
}
BOOL WINAPI
xGetMonitorInfo(HMONITOR hMonitor, LPMONITORINFO lpMonitorInfo)
{
RECT rcWork;
if (InitMultipleMonitorStubs())
return g_pfnGetMonitorInfo(hMonitor, lpMonitorInfo);
if ((hMonitor == xPRIMARY_MONITOR) && lpMonitorInfo &&
(lpMonitorInfo->cbSize >= sizeof(MONITORINFO)) &&
SystemParametersInfo(SPI_GETWORKAREA, 0, &rcWork, 0))
{
lpMonitorInfo->rcMonitor.left = 0;
lpMonitorInfo->rcMonitor.top = 0;
lpMonitorInfo->rcMonitor.right = GetSystemMetrics(SM_CXSCREEN);
lpMonitorInfo->rcMonitor.bottom = GetSystemMetrics(SM_CYSCREEN);
lpMonitorInfo->rcWork = rcWork;
lpMonitorInfo->dwFlags = MONITORINFOF_PRIMARY;
if (lpMonitorInfo->cbSize >= sizeof(MONITORINFOEX))
lstrcpy(((MONITORINFOEX*)lpMonitorInfo)->szDevice, TEXT("DISPLAY"));
return TRUE;
}
return FALSE;
}
BOOL WINAPI
xEnumDisplayMonitors(HDC hdcOptionalForPainting,
LPCRECT lprcEnumMonitorsThatIntersect, MONITORENUMPROC lpfnEnumProc,
LPARAM lData)
{
RECT rcCallback, rcLimit;
if (InitMultipleMonitorStubs())
return g_pfnEnumDisplayMonitors(hdcOptionalForPainting,
lprcEnumMonitorsThatIntersect, lpfnEnumProc, lData);
if (!lpfnEnumProc)
return FALSE;
rcLimit.left = 0;
rcLimit.top = 0;
rcLimit.right = GetSystemMetrics(SM_CXSCREEN);
rcLimit.bottom = GetSystemMetrics(SM_CYSCREEN);
if (hdcOptionalForPainting)
{
RECT rcClip;
HWND hWnd;
if ((hWnd = WindowFromDC(hdcOptionalForPainting)) == NULL)
return FALSE;
switch (GetClipBox(hdcOptionalForPainting, &rcClip))
{
default:
MapWindowPoints(NULL, hWnd, (LPPOINT)&rcLimit, 2);
if (IntersectRect(&rcCallback, &rcClip, &rcLimit))
break;
//fall thru
case NULLREGION:
return TRUE;
case ERROR:
return FALSE;
}
rcLimit = rcCallback;
}
if (!lprcEnumMonitorsThatIntersect ||
IntersectRect(&rcCallback, lprcEnumMonitorsThatIntersect, &rcLimit))
{
lpfnEnumProc(xPRIMARY_MONITOR, hdcOptionalForPainting, &rcCallback,
lData);
}
return TRUE;
}
#undef xPRIMARY_MONITOR
#undef COMPILE_MULTIMON_STUBS
#else// COMPILE_MULTIMON_STUBS
extern intWINAPI xGetSystemMetrics(int);
extern HMONITOR WINAPI xMonitorFromWindow(HWND, UINT);
extern HMONITOR WINAPI xMonitorFromRect(LPCRECT, UINT);
extern HMONITOR WINAPI xMonitorFromPoint(POINT, UINT);
extern BOOLWINAPI xGetMonitorInfo(HMONITOR, LPMONITORINFO);
extern BOOLWINAPI xEnumDisplayMonitors(HDC, LPCRECT, MONITORENUMPROC, LPARAM);
#endif// COMPILE_MULTIMON_STUBS
//
// build defines that replace the regular APIs with our versions
//
#define GetSystemMetrics xGetSystemMetrics
#define MonitorFromWindow xMonitorFromWindow
#define MonitorFromRect xMonitorFromRect
#define MonitorFromPoint xMonitorFromPoint
#define GetMonitorInfo xGetMonitorInfo
#define EnumDisplayMonitors xEnumDisplayMonitors
#ifdef __cplusplus
}
#endif/* __cplusplus */
#endif /* !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0500) */