/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtGui module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "qapplication.h"+
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#include "qdesktopwidget.h"+
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#include "qlibrary.h"+
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#include "qt_x11_p.h"+
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#include "qvariant.h"+
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#include "qwidget_p.h"+
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#include "qx11info_x11.h"+
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#include <limits.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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// defined in qwidget_x11.cpp+
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extern int qt_x11_create_desktop_on_screen;+
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+
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+
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// function to update the workarea of the screen+
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static bool qt_desktopwidget_workarea_dirty = true;+
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void qt_desktopwidget_update_workarea()+
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{+
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    qt_desktopwidget_workarea_dirty = true;+
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}+
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+
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+
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class QSingleDesktopWidget : public QWidget+
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{+
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public:+
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    QSingleDesktopWidget();+
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    ~QSingleDesktopWidget();+
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};+
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+
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QSingleDesktopWidget::QSingleDesktopWidget()+
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    : QWidget(0, Qt::Desktop)+
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{+
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}+
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+
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QSingleDesktopWidget::~QSingleDesktopWidget()+
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{+
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    const QObjectList &childList = children();+
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    for (int i = childList.size(); i > 0 ;) {+
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        --i;+
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        childList.at(i)->setParent(0);+
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    }+
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}+
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+
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+
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class QDesktopWidgetPrivate : public QWidgetPrivate+
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{+
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public:+
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    QDesktopWidgetPrivate();+
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    ~QDesktopWidgetPrivate();+
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+
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    void init();+
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+
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    bool use_xinerama;+
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    int defaultScreen;+
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    int screenCount;+
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+
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    QWidget **screens;+
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    QRect *rects;+
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    QRect *workareas;+
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};+
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+
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QDesktopWidgetPrivate::QDesktopWidgetPrivate()+
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    : use_xinerama(false), defaultScreen(0), screenCount(1),+
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      screens(0), rects(0), workareas(0)+
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{+
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}+
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+
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QDesktopWidgetPrivate::~QDesktopWidgetPrivate()+
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{+
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    if (screens) {+
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        for (int i = 0; i < screenCount; ++i) {+
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            if (i == defaultScreen) continue;+
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            delete screens[i];+
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            screens[i] = 0;+
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        }+
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+
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        free (screens);+
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    }+
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+
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    if (rects)     delete [] rects;+
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    if (workareas) delete [] workareas;+
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}+
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+
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void QDesktopWidgetPrivate::init()+
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{+
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    // get the screen count+
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    int newScreenCount = ScreenCount(X11->display);+
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#ifndef QT_NO_XINERAMA+
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+
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    XineramaScreenInfo *xinerama_screeninfo = 0;+
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+
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    // we ignore the Xinerama extension when using the display is+
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    // using traditional multi-screen (with multiple root windows)+
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    if (newScreenCount == 1+
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        && X11->ptrXineramaQueryExtension+
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        && X11->ptrXineramaIsActive+
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        && X11->ptrXineramaQueryScreens) {+
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        int unused;+
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        use_xinerama = (X11->ptrXineramaQueryExtension(X11->display, &unused, &unused)+
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                        && X11->ptrXineramaIsActive(X11->display));+
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    }+
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+
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    if (use_xinerama) {+
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        xinerama_screeninfo =+
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            X11->ptrXineramaQueryScreens(X11->display, &newScreenCount);+
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    }+
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+
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    if (xinerama_screeninfo) {+
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        defaultScreen = 0;+
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     } else+
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#endif // QT_NO_XINERAMA+
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    {+
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        defaultScreen = DefaultScreen(X11->display);+
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        newScreenCount = ScreenCount(X11->display);+
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        use_xinerama = false;+
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    }+
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+
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    delete [] rects;+
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    rects     = new QRect[newScreenCount];+
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    delete [] workareas;+
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    workareas = new QRect[newScreenCount];+
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+
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    // get the geometry of each screen+
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    int i, j, x, y, w, h;+
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    for (i = 0, j = 0; i < newScreenCount; i++, j++) {+
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+
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#ifndef QT_NO_XINERAMA+
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        if (use_xinerama) {+
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            x = xinerama_screeninfo[i].x_org;+
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            y = xinerama_screeninfo[i].y_org;+
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            w = xinerama_screeninfo[i].width;+
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            h = xinerama_screeninfo[i].height;+
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        } else+
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#endif // QT_NO_XINERAMA+
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            {+
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                x = 0;+
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                y = 0;+
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                w = WidthOfScreen(ScreenOfDisplay(X11->display, i));+
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                h = HeightOfScreen(ScreenOfDisplay(X11->display, i));+
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            }+
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+
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        rects[j].setRect(x, y, w, h);+
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+
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        if (use_xinerama && j > 0 && rects[j-1].intersects(rects[j])) {+
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            // merge a "cloned" screen with the previous, hiding all crtcs+
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            // that are currently showing a sub-rect of the previous screen+
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            if ((rects[j].width()*rects[j].height()) >+
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                (rects[j-1].width()*rects[j-1].height()))+
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                rects[j-1] = rects[j];+
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            j--;+
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        }+
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+
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        workareas[i] = QRect();+
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    }+
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+
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    if (screens) {+
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        // leaks QWidget* pointers on purpose, can't delete them as pointer escapes+
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        screens = q_check_ptr((QWidget**) realloc(screens, j * sizeof(QWidget*)));+
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        if (j > screenCount)+
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            memset(&screens[screenCount], 0, (j-screenCount) * sizeof(QWidget*));+
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    }+
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+
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    screenCount = j;+
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+
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#ifndef QT_NO_XINERAMA+
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    if (use_xinerama && screenCount == 1)+
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        use_xinerama = false;+
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+
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    if (xinerama_screeninfo)+
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        XFree(xinerama_screeninfo);+
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#endif // QT_NO_XINERAMA+
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+
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}+
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+
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// the QDesktopWidget itself will be created on the default screen+
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// as qt_x11_create_desktop_on_screen defaults to -1+
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QDesktopWidget::QDesktopWidget()+
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    : QWidget(*new QDesktopWidgetPrivate, 0, Qt::Desktop)+
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{+
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    Q_D(QDesktopWidget);+
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    d->init();+
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}+
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+
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QDesktopWidget::~QDesktopWidget()+
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{+
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}+
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+
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bool QDesktopWidget::isVirtualDesktop() const+
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{+
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    Q_D(const QDesktopWidget);+
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    return d->use_xinerama;+
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}+
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+
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int QDesktopWidget::primaryScreen() const+
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{+
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    Q_D(const QDesktopWidget);+
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    return d->defaultScreen;+
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}+
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+
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int QDesktopWidget::numScreens() const+
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{+
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    Q_D(const QDesktopWidget);+
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    return d->screenCount;+
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}+
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+
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QWidget *QDesktopWidget::screen(int screen)+
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{+
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    Q_D(QDesktopWidget);+
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    if (d->use_xinerama)+
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        return this;+
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+
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    if (screen < 0 || screen >= d->screenCount)+
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        screen = d->defaultScreen;+
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+
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    if (! d->screens) {+
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        d->screens = (QWidget**) calloc( d->screenCount, sizeof(QWidget*));+
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        d->screens[d->defaultScreen] = this;+
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    }+
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+
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    if (! d->screens[screen] ||               // not created yet+
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        ! (d->screens[screen]->windowType() == Qt::Desktop)) { // reparented away+
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        qt_x11_create_desktop_on_screen = screen;+
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        d->screens[screen] = new QSingleDesktopWidget;+
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        qt_x11_create_desktop_on_screen = -1;+
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    }+
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+
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    return d->screens[screen];+
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}+
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+
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const QRect QDesktopWidget::availableGeometry(int screen) const+
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{+
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    Q_D(const QDesktopWidget);+
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    if (qt_desktopwidget_workarea_dirty) {+
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        // the workareas are dirty, invalidate them+
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        for (int i = 0; i < d->screenCount; ++i)+
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            d->workareas[i] = QRect();+
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        qt_desktopwidget_workarea_dirty = false;+
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    }+
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+
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    if (screen < 0 || screen >= d->screenCount)+
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        screen = d->defaultScreen;+
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+
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    if (d->workareas[screen].isValid())+
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        return d->workareas[screen];+
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+
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    if (X11->isSupportedByWM(ATOM(_NET_WORKAREA))) {+
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        int x11Screen = isVirtualDesktop() ? DefaultScreen(X11->display) : screen;+
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+
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        Atom ret;+
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        int format, e;+
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        unsigned char *data = 0;+
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        unsigned long nitems, after;+
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+
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        e = XGetWindowProperty(X11->display,+
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                               QX11Info::appRootWindow(x11Screen),+
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                               ATOM(_NET_WORKAREA), 0, 4, False, XA_CARDINAL,+
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                               &ret, &format, &nitems, &after, &data);+
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+
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        QRect workArea;+
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        if (e == Success && ret == XA_CARDINAL &&+
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            format == 32 && nitems == 4) {+
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            long *workarea = (long *) data;+
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            workArea = QRect(workarea[0], workarea[1], workarea[2], workarea[3]);+
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        } else {+
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            workArea = screenGeometry(screen);+
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        }+
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+
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        if (isVirtualDesktop()) {+
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            // intersect the workarea (which spawns all Xinerama screens) with the rect for the+
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            // requested screen+
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            workArea &= screenGeometry(screen);+
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        }+
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+
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        d->workareas[screen] = workArea;+
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+
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        if (data)+
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            XFree(data);+
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    } else {+
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        d->workareas[screen] = screenGeometry(screen);+
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    }+
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+
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    return d->workareas[screen];+
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}+
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+
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const QRect QDesktopWidget::screenGeometry(int screen) const+
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{+
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    Q_D(const QDesktopWidget);+
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    if (screen < 0 || screen >= d->screenCount)+
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        screen = d->defaultScreen;+
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+
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    return d->rects[screen];+
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}+
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+
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int QDesktopWidget::screenNumber(const QWidget *widget) const+
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{+
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    Q_D(const QDesktopWidget);+
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    if (!widget)+
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        return d->defaultScreen;+
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+
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#ifndef QT_NO_XINERAMA+
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    if (d->use_xinerama) {+
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        // this is how we do it for xinerama+
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        QRect frame = widget->frameGeometry();+
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        if (!widget->isWindow())+
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            frame.moveTopLeft(widget->mapToGlobal(QPoint(0, 0)));+
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+
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        int maxSize = -1;+
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        int maxScreen = -1;+
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+
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        for (int i = 0; i < d->screenCount; ++i) {+
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            QRect sect = d->rects[i].intersected(frame);+
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            int size = sect.width() * sect.height();+
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            if (size > maxSize && sect.width() > 0 && sect.height() > 0) {+
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                maxSize = size;+
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                maxScreen = i;+
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            }+
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        }+
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        return maxScreen;+
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    }+
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#endif // QT_NO_XINERAMA+
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+
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    return widget->x11Info().screen();+
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}+
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+
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int QDesktopWidget::screenNumber(const QPoint &point) const+
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{+
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    Q_D(const QDesktopWidget);+
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    int closestScreen = -1;+
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    int shortestDistance = INT_MAX;+
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    for (int i = 0; i < d->screenCount; ++i) {+
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        int thisDistance = d->pointToRect(point, d->rects[i]);+
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        if (thisDistance < shortestDistance) {+
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            shortestDistance = thisDistance;+
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            closestScreen = i;+
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        }+
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    }+
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    return closestScreen;+
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}+
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+
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void QDesktopWidget::resizeEvent(QResizeEvent *event)+
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{+
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    Q_D(QDesktopWidget);+
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    int oldScreenCount = d->screenCount;+
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    QVector<QRect> oldRects(oldScreenCount);+
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    for (int i = 0; i < oldScreenCount; ++i) {+
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        oldRects[i] = d->rects[i];+
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    }+
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+
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    d->init();+
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+
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    for (int i = 0; i < qMin(oldScreenCount, d->screenCount); ++i) {+
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        if (oldRects.at(i) != d->rects[i])+
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            emit resized(i);+
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    }+
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+
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    if (oldScreenCount != d->screenCount) {+
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        emit screenCountChanged(d->screenCount);+
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    }+
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+
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    qt_desktopwidget_workarea_dirty = true;+
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    QWidget::resizeEvent(event);+
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}+
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+
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QT_END_NAMESPACE+
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