/******************************************************************************** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.**** This file is part of the QtGui module of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 as published by the Free Software Foundation** and appearing in the file LICENSE.GPL included in the packaging of** this file.  Please review the following information to ensure GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#include "qcursor.h"#ifndef QT_NO_CURSOR#include <qapplication.h>#include <qbitmap.h>#include <qimage.h>#include <qdatastream.h>#include <qvariant.h>#include <private/qcursor_p.h>/*!    \class QCursor    \brief The QCursor class provides a mouse cursor with an arbitrary    shape.    \ingroup appearance    \ingroup shared    \mainclass    This class is mainly used to create mouse cursors that are    associated with particular widgets and to get and set the position    of the mouse cursor.    Qt has a number of standard cursor shapes, but you can also make    custom cursor shapes based on a QBitmap, a mask and a hotspot.    To associate a cursor with a widget, use QWidget::setCursor(). To    associate a cursor with all widgets (normally for a short period    of time), use QApplication::setOverrideCursor().    To set a cursor shape use QCursor::setShape() or use the QCursor    constructor which takes the shape as argument, or you can use one    of the predefined cursors defined in the \l Qt::CursorShape enum.    If you want to create a cursor with your own bitmap, either use    the QCursor constructor which takes a bitmap and a mask or the    constructor which takes a pixmap as arguments.    To set or get the position of the mouse cursor use the static    methods QCursor::pos() and QCursor::setPos().    \img cursors.png Cursor Shapes    \section1 A Note for X11 Users    On X11, Qt supports the \link    http://www.xfree86.org/4.3.0/Xcursor.3.html Xcursor\endlink    library, which allows for full color icon themes. The table below    shows the cursor name used for each Qt::CursorShape value. If a    cursor cannot be found using the name shown below, a standard X11    cursor will be used instead. Note: X11 does not provide    appropriate cursors for all possible Qt::CursorShape values. It    is possible that some cursors will be taken from the Xcursor    theme, while others will use an internal bitmap cursor.    \table    \header \o Qt::CursorShape Values   \o Cursor Names    \row \o Qt::ArrowCursor             \o \c left_ptr    \row \o Qt::UpArrowCursor           \o \c up_arrow    \row \o Qt::CrossCursor             \o \c cross    \row \o Qt::WaitCursor              \o \c wait    \row \o Qt::BusyCursor              \o \c left_ptr_watch    \row \o Qt::IBeamCursor             \o \c ibeam    \row \o Qt::SizeVerCursor           \o \c size_ver    \row \o Qt::SizeHorCursor           \o \c size_hor    \row \o Qt::SizeBDiagCursor         \o \c size_bdiag    \row \o Qt::SizeFDiagCursor         \o \c size_fdiag    \row \o Qt::SizeAllCursor           \o \c size_all    \row \o Qt::SplitVCursor            \o \c split_v    \row \o Qt::SplitHCursor            \o \c split_h    \row \o Qt::PointingHandCursor      \o \c pointing_hand    \row \o Qt::ForbiddenCursor         \o \c forbidden    \row \o Qt::WhatsThisCursor         \o \c whats_this    \endtable    \sa QWidget, {fowler}{GUI Design Handbook: Cursors}*//*!    \fn HCURSOR_or_HANDLE QCursor::handle() const    Returns a handle to the cursor.    \warning Using the value returned by this function is not    portable.    \sa Qt::HANDLE*//*!    \fn QCursor::QCursor(HCURSOR cursor)    Constructs a Qt cursor from the given Windows \a cursor.    \warning This function is only available on Windows.    \sa handle()*//*!    \fn QCursor::QCursor(Qt::HANDLE handle)    Constructs a Qt cursor from the given \a handle.    \warning This function is only available on X11.    \sa handle()*//*****************************************************************************  QCursor stream functions *****************************************************************************/#ifndef QT_NO_DATASTREAM/*!    \fn QDataStream &operator<<(QDataStream &stream, const QCursor &cursor)    \relates QCursor    Writes the \a cursor to the \a stream.    \sa {Format of the QDataStream operators}*/QDataStream &operator<<(QDataStream &s, const QCursor &c){    s << (qint16)c.shape();                        // write shape id to stream    if (c.shape() == Qt::BitmapCursor) {                // bitmap cursor        bool isPixmap = false;        if (s.version() >= 7) {            isPixmap = !c.pixmap().isNull();            s << isPixmap;        }        if (isPixmap)            s << c.pixmap();        else            s << *c.bitmap() << *c.mask();        s << c.hotSpot();    }    return s;}/*!    \fn QDataStream &operator>>(QDataStream &stream, QCursor &cursor)    \relates QCursor    Reads the \a cursor from the \a stream.    \sa {Format of the QDataStream operators}*/QDataStream &operator>>(QDataStream &s, QCursor &c){    qint16 shape;    s >> shape;                                        // read shape id from stream    if (shape == Qt::BitmapCursor) {                // read bitmap cursor        bool isPixmap = false;        if (s.version() >= 7)            s >> isPixmap;        if (isPixmap) {            QPixmap pm;            QPoint hot;            s >> pm >> hot;            c = QCursor(pm, hot.x(), hot.y());        } else {            QBitmap bm, bmm;            QPoint hot;            s >> bm >> bmm >> hot;            c = QCursor(bm, bmm, hot.x(), hot.y());        }    } else {        c.setShape((Qt::CursorShape)shape);                // create cursor with shape    }    return s;}#endif // QT_NO_DATASTREAM/*!    Constructs a custom pixmap cursor.    \a pixmap is the image. It is usual to give it a mask (set using    QPixmap::setMask()). \a hotX and \a hotY define the cursor's hot    spot.    If \a hotX is negative, it is set to the \c{pixmap().width()/2}.    If \a hotY is negative, it is set to the \c{pixmap().height()/2}.    Valid cursor sizes depend on the display hardware (or the    underlying window system). We recommend using 32 x 32 cursors,    because this size is supported on all platforms. Some platforms    also support 16 x 16, 48 x 48, and 64 x 64 cursors.    \sa QPixmap::QPixmap(), QPixmap::setMask()*/QCursor::QCursor(const QPixmap &pixmap, int hotX, int hotY)    : d(0){    QImage img = pixmap.toImage().convertToFormat(QImage::Format_Indexed8, Qt::ThresholdDither|Qt::AvoidDither);    QBitmap bm = QBitmap::fromImage(img, Qt::ThresholdDither|Qt::AvoidDither);    QBitmap bmm = pixmap.mask();    if (!bmm.isNull()) {        QBitmap nullBm;        bm.setMask(nullBm);    }    else if (!pixmap.mask().isNull()) {        QImage mimg = pixmap.mask().toImage().convertToFormat(QImage::Format_Indexed8, Qt::ThresholdDither|Qt::AvoidDither);        bmm = QBitmap::fromImage(mimg, Qt::ThresholdDither|Qt::AvoidDither);    }    else {        bmm = QBitmap(bm.size());        bmm.fill(Qt::color1);    }    d = QCursorData::setBitmap(bm, bmm, hotX, hotY);    d->pixmap = pixmap;}/*!    Constructs a custom bitmap cursor.    \a bitmap and    \a mask make up the bitmap.    \a hotX and    \a hotY define the cursor's hot spot.    If \a hotX is negative, it is set to the \c{bitmap().width()/2}.    If \a hotY is negative, it is set to the \c{bitmap().height()/2}.    The cursor \a bitmap (B) and \a mask (M) bits are combined like this:    \list    \o B=1 and M=1 gives black.    \o B=0 and M=1 gives white.    \o B=0 and M=0 gives transparent.    \o B=1 and M=0 gives an XOR'd result.    \endlist    Use the global Qt color Qt::color0 to draw 0-pixels and Qt::color1 to    draw 1-pixels in the bitmaps.    Valid cursor sizes depend on the display hardware (or the    underlying window system). We recommend using 32 x 32 cursors,    because this size is supported on all platforms. Some platforms    also support 16 x 16, 48 x 48, and 64 x 64 cursors.    \sa QBitmap::QBitmap(), QBitmap::setMask()*/QCursor::QCursor(const QBitmap &bitmap, const QBitmap &mask, int hotX, int hotY)    : d(0){    d = QCursorData::setBitmap(bitmap, mask, hotX, hotY);}QCursorData *qt_cursorTable[Qt::LastCursor + 1];bool QCursorData::initialized = false;/*! \internal */void QCursorData::cleanup(){    if(!QCursorData::initialized)        return;    for (int shape = 0; shape <= Qt::LastCursor; ++shape) {        delete qt_cursorTable[shape];        qt_cursorTable[shape] = 0;    }    QCursorData::initialized = false;}/*! \internal */void QCursorData::initialize(){    if (QCursorData::initialized)        return;#ifdef Q_WS_MAC    InitCursor();#endif    for (int shape = 0; shape <= Qt::LastCursor; ++shape)        qt_cursorTable[shape] = new QCursorData((Qt::CursorShape)shape);    QCursorData::initialized = true;}/*!    Constructs a cursor with the default arrow shape.*/QCursor::QCursor(){    if (!QCursorData::initialized) {        if (qApp->startingUp()) {            d = 0;            return;        }        QCursorData::initialize();    }    QCursorData *c = qt_cursorTable[0];    c->ref.ref();    d = c;}/*!    Constructs a cursor with the specified \a shape.    See \l Qt::CursorShape for a list of shapes.    \sa setShape()*/QCursor::QCursor(Qt::CursorShape shape)    : d(0){    if (!QCursorData::initialized)        QCursorData::initialize();    setShape(shape);}/*!    Returns the cursor shape identifier. The return value is one of    the \l Qt::CursorShape enum values (cast to an int).    \sa setShape()*/Qt::CursorShape QCursor::shape() const{    if (!QCursorData::initialized)        QCursorData::initialize();    return d->cshape;}/*!    Sets the cursor to the shape identified by \a shape.    See \l Qt::CursorShape for the list of cursor shapes.    \sa shape()*/void QCursor::setShape(Qt::CursorShape shape){    if (!QCursorData::initialized)        QCursorData::initialize();    QCursorData *c = uint(shape) <= Qt::LastCursor ? qt_cursorTable[shape] : 0;    if (!c)        c = qt_cursorTable[0];    c->ref.ref();    if (!d) {        d = c;    } else {        c = qAtomicSetPtr(&d, c);        if (!c->ref.deref())            delete c;    }}/*!    Returns the cursor bitmap, or 0 if it is one of the standard    cursors.*/const QBitmap *QCursor::bitmap() const{    if (!QCursorData::initialized)        QCursorData::initialize();    return d->bm;}/*!    Returns the cursor bitmap mask, or 0 if it is one of the standard    cursors.*/const QBitmap *QCursor::mask() const{    if (!QCursorData::initialized)        QCursorData::initialize();    return d->bmm;}/*!    Returns the cursor pixmap. This is only valid if the cursor is a    pixmap cursor.*/QPixmap QCursor::pixmap() const{    if (!QCursorData::initialized)        QCursorData::initialize();    return d->pixmap;}/*!    Returns the cursor hot spot, or (0, 0) if it is one of the    standard cursors.*/QPoint QCursor::hotSpot() const{    if (!QCursorData::initialized)        QCursorData::initialize();    return QPoint(d->hx, d->hy);}/*!    Constructs a copy of the cursor \a c.*/QCursor::QCursor(const QCursor &c){    if (!QCursorData::initialized)        QCursorData::initialize();    d = c.d;    d->ref.ref();}/*!    Destroys the cursor.*/QCursor::~QCursor(){    if (d && !d->ref.deref())        delete d;}/*!    Assigns \a c to this cursor and returns a reference to this    cursor.*/QCursor &QCursor::operator=(const QCursor &c){    if (!QCursorData::initialized)        QCursorData::initialize();    qAtomicAssign(d, c.d);    return *this;}/*!   Returns the cursor as a QVariant.*/QCursor::operator QVariant() const{    return QVariant(QVariant::Cursor, this);}#endif // QT_NO_CURSOR