source: trunk/src/gui/kernel/qdesktopwidget_win.cpp

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#include "qdesktopwidget.h"
#include "qt_windows.h"
#include "qapplication_p.h"
#include <private/qsystemlibrary_p.h>
#include <qvector.h>
#include <limits.h>
#ifdef Q_WS_WINCE
#include <sipapi.h>
#endif
#include "qwidget_p.h"
#include "qdebug.h"

QT_BEGIN_NAMESPACE

class QDesktopWidgetPrivate : public QWidgetPrivate
{
public:
    QDesktopWidgetPrivate();
    ~QDesktopWidgetPrivate();

    static void init(QDesktopWidget *that);
    static void cleanup();
    static int screenCount;
    static int primaryScreen;

    static QVector<QRect> *rects;
    static QVector<QRect> *workrects;

    struct MONITORINFO
    {
        DWORD   cbSize;
        RECT    rcMonitor;
        RECT    rcWork;
        DWORD   dwFlags;
    };

    typedef BOOL (WINAPI *InfoFunc)(HMONITOR, MONITORINFO*);
    typedef BOOL (QT_WIN_CALLBACK *EnumProc)(HMONITOR, HDC, LPRECT, LPARAM);
    typedef BOOL (WINAPI *EnumFunc)(HDC, LPCRECT, EnumProc, LPARAM);

    static EnumFunc enumDisplayMonitors;
    static InfoFunc getMonitorInfo;
    static int refcount;
};

int QDesktopWidgetPrivate::screenCount = 1;
int QDesktopWidgetPrivate::primaryScreen = 0;
QDesktopWidgetPrivate::EnumFunc QDesktopWidgetPrivate::enumDisplayMonitors = 0;
QDesktopWidgetPrivate::InfoFunc QDesktopWidgetPrivate::getMonitorInfo = 0;
QVector<QRect> *QDesktopWidgetPrivate::rects = 0;
QVector<QRect> *QDesktopWidgetPrivate::workrects = 0;
static int screen_number = 0;
int QDesktopWidgetPrivate::refcount = 0;
#ifdef Q_WS_WINCE_WM
// Use SIP information, if available
// SipGetInfo is not supported by SSDK (no definition!). 
static inline void qt_get_sip_info(QRect &rect)
{
    SIPINFO sip;
    memset(&sip, 0, sizeof(SIPINFO));
    sip.cbSize = sizeof(SIPINFO);
    if (SipGetInfo(&sip))
        rect = QRect(QPoint(sip.rcVisibleDesktop.left, sip.rcVisibleDesktop.top),
        QPoint(sip.rcVisibleDesktop.right - 1, sip.rcVisibleDesktop.bottom - 1));
}
#endif


BOOL QT_WIN_CALLBACK enumCallback(HMONITOR hMonitor, HDC, LPRECT, LPARAM)
{
    QDesktopWidgetPrivate::screenCount++;
    QDesktopWidgetPrivate::rects->resize(QDesktopWidgetPrivate::screenCount);
    QDesktopWidgetPrivate::workrects->resize(QDesktopWidgetPrivate::screenCount);
    // Get the MONITORINFO block
    QDesktopWidgetPrivate::MONITORINFO info;
    memset(&info, 0, sizeof(QDesktopWidgetPrivate::MONITORINFO));
    info.cbSize = sizeof(QDesktopWidgetPrivate::MONITORINFO);
    BOOL res = QDesktopWidgetPrivate::getMonitorInfo(hMonitor, &info);
    if (!res) {
        (*QDesktopWidgetPrivate::rects)[screen_number] = QRect();
        (*QDesktopWidgetPrivate::workrects)[screen_number] = QRect();
        return true;
    }

    // Fill list of rects
    RECT r = info.rcMonitor;
    QRect qr(QPoint(r.left, r.top), QPoint(r.right - 1, r.bottom - 1));
    (*QDesktopWidgetPrivate::rects)[screen_number] = qr;

    r = info.rcWork;
    qr = QRect(QPoint(r.left, r.top), QPoint(r.right - 1, r.bottom - 1));
    (*QDesktopWidgetPrivate::workrects)[screen_number] = qr;

    if (info.dwFlags & 0x00000001) //MONITORINFOF_PRIMARY
        QDesktopWidgetPrivate::primaryScreen = screen_number;

    ++screen_number;
    // Stop the enumeration if we have them all
    return true;
}

QDesktopWidgetPrivate::QDesktopWidgetPrivate()
{
    ++refcount;
}

void QDesktopWidgetPrivate::init(QDesktopWidget *that)
{
    if (rects)
        return;

    rects = new QVector<QRect>();
    workrects = new QVector<QRect>();
    screenCount = 0;

#ifndef Q_OS_WINCE
    QSystemLibrary user32Lib(QLatin1String("user32"));
    if (user32Lib.load()) {
        enumDisplayMonitors = (EnumFunc)user32Lib.resolve("EnumDisplayMonitors");
        getMonitorInfo = (InfoFunc)user32Lib.resolve("GetMonitorInfoW");
    }

    if (!enumDisplayMonitors || !getMonitorInfo) {
        screenCount = GetSystemMetrics(80);  // SM_CMONITORS
        rects->resize(screenCount);
        for (int i = 0; i < screenCount; ++i)
            rects->replace(i, that->rect());
        return;
    }
    // Calls enumCallback