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#include "qdesktopwidget.h"

#include "qt_windows.h"

#include "qapplication_p.h"

#include "qlibrary.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 (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 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

    QLibrary 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

    enumDisplayMonitors(0, 0, enumCallback, 0);

    enumDisplayMonitors = 0;

    getMonitorInfo = 0;

#else

    QLibrary coreLib(QLatin1String("coredll"));

    if (coreLib.load()) {

        // CE >= 4.0 case

        enumDisplayMonitors = (EnumFunc)coreLib.resolve("EnumDisplayMonitors");

        getMonitorInfo = (InfoFunc)coreLib.resolve("GetMonitorInfo");

    }

    if ((!enumDisplayMonitors || !getMonitorInfo)) {

        screenCount = GetSystemMetrics(SM_CMONITORS);

        return;

    }

    if (!coreLib.isLoaded() || !enumDisplayMonitors || !getMonitorInfo) {

        rects->resize(screenCount);

        for (int i = 0; i < screenCount; ++i)

            (*rects)[i] = that->rect();

        RECT r;

        SystemParametersInfo(SPI_GETWORKAREA, 0, &r, 0);

        QRect qr = QRect(QPoint(r.left, r.top), QPoint(r.right - 1, r.bottom - 1));

#if defined(Q_WS_WINCE_WM)

        qt_get_sip_info(qr);

#endif

        workrects->resize(screenCount);

        for (int j = 0; j < screenCount; ++j)

            (*workrects)[j] = qr;

        return;

    }

    // Calls enumCallback

    enumDisplayMonitors(0, 0, enumCallback, 0);

    enumDisplayMonitors = 0;

    getMonitorInfo = 0;

#endif // Q_WS_WINCE

}

QDesktopWidgetPrivate::~QDesktopWidgetPrivate()

{

    if (!--refcount)

        cleanup();

}

void QDesktopWidgetPrivate::cleanup()

{

    screen_number = 0;

    screenCount = 1;

    primaryScreen = 0;

    enumDisplayMonitors = 0;

    getMonitorInfo = 0;

    delete rects;

    rects = 0;

    delete workrects;

    workrects = 0;

}

/*

    \omit

    Function is commented out in header

    \fn void *QDesktopWidget::handle(int screen) const

    Returns the window system handle of the display device with the

    index \a screen, for low-level access.  Using this function is not

    portable.

    The return type varies with platform; see qwindowdefs.h for details.

    \sa x11Display(), QPaintDevice::handle()

    \endomit

*/

QDesktopWidget::QDesktopWidget()

    : QWidget(*new QDesktopWidgetPrivate, 0, Qt::Desktop)

{

    setObjectName(QLatin1String("desktop"));

    QDesktopWidgetPrivate::init(this);

}

QDesktopWidget::~QDesktopWidget()

{

}

bool QDesktopWidget::isVirtualDesktop() const

{

    return true;

}

int QDesktopWidget::primaryScreen() const

{

    return d_func()->primaryScreen;

}

int QDesktopWidget::numScreens() const

{

    return d_func()->screenCount;

}

QWidget *QDesktopWidget::screen(int /* screen */)

{

    // It seems that a Qt::WType_Desktop cannot be moved?

    return this;

}

//

// MSVC 7.10 warns that d (the result of the expanded Q_D macro) as a local variable that is not referenced.

// Therefore, we ignore that warning with the following pragmas

// I've also tried to eliminate the macro, but to no use...

// We pop it further down

#ifdef Q_CC_MSVC

# pragma warning(push)

# pragma warning(disable : 4189)

#endif

const QRect QDesktopWidget::availableGeometry(int screen) const

{

    Q_D(const QDesktopWidget);

#ifdef Q_WS_WINCE_WM

    for(int i=0; i < d->workrects->size(); ++i)

        qt_get_sip_info((*d->workrects)[i]);

#endif

    if (screen < 0 || screen >= d->screenCount)

        screen = d->primaryScreen;

    return d->workrects->at(screen);

}

const QRect QDesktopWidget::screenGeometry(int screen) const

{

    const QDesktopWidgetPrivate *d = d_func();

    if (screen < 0 || screen >= d->screenCount)

        screen = d->primaryScreen;

    return d->rects->at(screen);

}

int QDesktopWidget::screenNumber(const QWidget *widget) const

{

    Q_D(const QDesktopWidget);

    if (!widget)

        return d->primaryScreen;

    QRect frame = widget->frameGeometry();

    if (!widget->isWindow())

        frame.moveTopLeft(widget->mapToGlobal(QPoint(0,0)));

    int maxSize = -1;

    int maxScreen = -1;

    for (int i = 0; i < d->screenCount; ++i) {

        QRect sect = d->rects->at(i).intersected(frame);

        int size = sect.width() * sect.height();

        if (size > maxSize && sect.width() > 0 && sect.height() > 0) {

            maxSize = size;

            maxScreen = i;

        }

    }

    return maxScreen;

}

int QDesktopWidget::screenNumber(const QPoint &point) const

{

    Q_D(const QDesktopWidget);

    int closestScreen = -1;

    int shortestDistance = INT_MAX;

    for (int i = 0; i < d->screenCount; ++i) {

        int thisDistance = d->pointToRect(point, d->rects->at(i));

        if (thisDistance < shortestDistance) {

            shortestDistance = thisDistance;

            closestScreen = i;

        }

    }

    return closestScreen;

}

void QDesktopWidget::resizeEvent(QResizeEvent *)

{

    Q_D(QDesktopWidget);

    const QVector<QRect> oldrects(*d->rects);

    const QVector<QRect> oldworkrects(*d->workrects);

    int oldscreencount = d->screenCount;

    QDesktopWidgetPrivate::cleanup();

    QDesktopWidgetPrivate::init(this);

#ifdef Q_WS_WINCE_WM

    for(int i=0; i < d->workrects->size(); ++i)

        qt_get_sip_info((*d->workrects)[i]);

#endif

    for (int i = 0; i < qMin(oldscreencount, d->screenCount); ++i) {

        const QRect oldrect = oldrects[i];

        const QRect newrect = d->rects->at(i);

        if (oldrect != newrect)

            emit resized(i);

    }

    for (int j = 0; j < qMin(oldscreencount, d->screenCount); ++j) {

        const QRect oldrect = oldworkrects[j];

        const QRect newrect = d->workrects->at(j);

        if (oldrect != newrect)

            emit workAreaResized(j);

    }

    if (oldscreencount != d->screenCount) {

        emit screenCountChanged(d->screenCount);

    }

}

#ifdef Q_CC_MSVC

# pragma warning(pop)

#endif

QT_END_NAMESPACE