/****************************************************************************

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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** This file is part of the QtGui module of the Qt Toolkit.

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** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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****************************************************************************/

#include "qdesktopwidget.h"

#include "qscreen_qws.h"

#include "private/qapplication_p.h"

QT_BEGIN_NAMESPACE

QT_USE_NAMESPACE

QDesktopWidget::QDesktopWidget()

    : QWidget(0, Qt::Desktop)

{

    setObjectName(QLatin1String("desktop"));

}

QDesktopWidget::~QDesktopWidget()

{

}

bool QDesktopWidget::isVirtualDesktop() const

{

    return true;

}

int QDesktopWidget::primaryScreen() const

{

    return 0;

}

int QDesktopWidget::numScreens() const

{

    QScreen *screen = QScreen::instance();

    if (!screen)

        return 0;

    const QList<QScreen*> subScreens = screen->subScreens();

    return qMax(subScreens.size(), 1);

}

QWidget *QDesktopWidget::screen(int)

{

    return this;

}

const QRect QDesktopWidget::availableGeometry(int screenNo) const

{

    const QScreen *screen = QScreen::instance();

    if (screenNo == -1)

        screenNo = 0;

    if (!screen || screenNo < 0)

        return QRect();

    const QList<QScreen*> subScreens = screen->subScreens();

    if (!subScreens.isEmpty()) {

        if (screenNo >= subScreens.size())

            return QRect();

        screen = subScreens.at(screenNo);

    }

    QApplicationPrivate *ap = QApplicationPrivate::instance();

    const QRect r = ap->maxWindowRect(screen);

    if (!r.isEmpty())

        return r;

    return screen->region().boundingRect();

}

const QRect QDesktopWidget::screenGeometry(int screenNo) const

{

    const QScreen *screen = QScreen::instance();

    if (screenNo == -1)

        screenNo = 0;

    if (!screen || screenNo < 0)

        return QRect();

    const QList<QScreen*> subScreens = screen->subScreens();

    if (subScreens.size() == 0 && screenNo == 0)

        return screen->region().boundingRect();

    if (screenNo >= subScreens.size())

        return QRect();

    return subScreens.at(screenNo)->region().boundingRect();

}

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

{

    if (!w)

        return 0;

    QRect frame = w->frameGeometry();

    if (!w->isWindow())

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

    const QPoint midpoint = (frame.topLeft() + frame.bottomRight()) / 2;

    return screenNumber(midpoint);

}

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

{

    const QScreen *screen = QScreen::instance();

    if (!screen || !screen->region().contains(p))

        return -1;

    const QList<QScreen*> subScreens = screen->subScreens();

    if (subScreens.size() == 0)

        return 0;

    for (int i = 0; i < subScreens.size(); ++i)

        if (subScreens.at(i)->region().contains(p))

            return i;

    return -1;

}

void QDesktopWidget::resizeEvent(QResizeEvent *)

{

}

QT_END_NAMESPACE