qvariant.h

qt-x11-opensource-src-4.1.4.tar.gz源码

/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtCore 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 [e-mail].
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef QVARIANT_H
#define QVARIANT_H

#include <QtCore/qatomic.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qlist.h>
#include <QtCore/qmetatype.h>
#include <QtCore/qmap.h>
#include <QtCore/qstring.h>

QT_BEGIN_HEADER

QT_MODULE(Core)

class QBitArray;
class QDataStream;
class QDate;
class QDateTime;
class QLine;
class QLineF;
class QLocale;
class QStringList;
class QTime;
class QPoint;
class QPointF;
class QSize;
class QSizeF;
class QRect;
class QRectF;
class QRegExp;
class QTextFormat;
class QTextLength;
class QUrl;
class QVariant;
class QVariantComparisonHelper;

#ifndef QT_NO_MEMBER_TEMPLATES
template <typename T>
inline QVariant qVariantFromValue(const T &);

template <typename T>
inline void qVariantSetValue(QVariant &, const T &);

template<typename T>
inline T qVariantValue(const QVariant &);

template<typename T>
inline bool qVariantCanConvert(const QVariant &);
#endif

class Q_CORE_EXPORT QVariant
{
 public:
    enum Type {
        Invalid = 0,

        Bool = 1,
        Int = 2,
        UInt = 3,
        LongLong = 4,
        ULongLong = 5,
        Double = 6,
        Char = 7,
        Map = 8,
        List = 9,
        String = 10,
        StringList = 11,
        ByteArray = 12,
        BitArray = 13,
        Date = 14,
        Time = 15,
        DateTime = 16,
        Url = 17,
        Locale = 18,
        Rect = 19,
        RectF = 20,
        Size = 21,
        SizeF = 22,
        Line = 23,
        LineF = 24,
        Point = 25,
        PointF = 26,
	RegExp = 27,

#ifdef QT3_SUPPORT
        ColorGroup = 63,
#endif
        Font = 64,
        Pixmap = 65,
        Brush = 66,
        Color = 67,
        Palette = 68,
        Icon = 69,
        Image = 70,
        Polygon = 71,
        Region = 72,
        Bitmap = 73,
        Cursor = 74,
        SizePolicy = 75,
        KeySequence = 76,
        Pen = 77,
        TextLength = 78,
        TextFormat = 79,
        UserType = 127,
#ifdef QT3_SUPPORT
        IconSet = Icon,
        CString = ByteArray,
        PointArray = Polygon,
#endif
        LastType = 0xffffffff // need this so that gcc >= 3.4 allocates 32 bits for Type
    };

    inline QVariant();
    ~QVariant();
    QVariant(Type type);
    QVariant(int typeOrUserType, const void *copy);
    QVariant(const QVariant &other);

#ifndef QT_NO_DATASTREAM
    QVariant(QDataStream &s);
#endif

    QVariant(int i);
    QVariant(uint ui);
    QVariant(qlonglong ll);
    QVariant(qulonglong ull);
    QVariant(bool b);
    QVariant(double d);
#ifndef QT_NO_CAST_FROM_ASCII
    QVariant(const char *str);
#endif

    QVariant(const QByteArray &bytearray);
    QVariant(const QBitArray &bitarray);
    QVariant(const QString &string);
    QVariant(const QLatin1String &string);
    QVariant(const QStringList &stringlist);
    QVariant(const QChar &qchar);
    QVariant(const QDate &date);
    QVariant(const QTime &time);
    QVariant(const QDateTime &datetime);
    QVariant(const QList<QVariant> &list);
    QVariant(const QMap<QString,QVariant> &map);
#ifndef QT_NO_GEOM_VARIANT
    QVariant(const QSize &size);
    QVariant(const QSizeF &size);
    QVariant(const QPoint &pt);
    QVariant(const QPointF &pt);
    QVariant(const QLine &line);
    QVariant(const QLineF &line);
    QVariant(const QRect &rect);
    QVariant(const QRectF &rect);
#endif
    QVariant(const QUrl &url);
    QVariant(const QLocale &locale);
    QVariant(const QRegExp &regExp);

    QVariant& operator=(const QVariant &other);

    Type type() const;
    int userType() const;
    const char *typeName() const;

    bool canConvert(Type t) const;
    bool convert(Type t);

#ifdef QT3_SUPPORT
    inline QT3_SUPPORT bool canCast(Type t) const
    { return canConvert(t); }
    inline QT3_SUPPORT bool cast(Type t)
    { return convert(t); }
#endif

    inline bool isValid() const;
    bool isNull() const;

    void clear();

    void detach();
    inline bool isDetached() const;

    int toInt(bool *ok = 0) const;
    uint toUInt(bool *ok = 0) const;
    qlonglong toLongLong(bool *ok = 0) const;
    qulonglong toULongLong(bool *ok = 0) const;
    bool toBool() const;
    double toDouble(bool *ok = 0) const;
    QByteArray toByteArray() const;
    QBitArray toBitArray() const;
    QString toString() const;
    QStringList toStringList() const;
    QChar toChar() const;
    QDate toDate() const;
    QTime toTime() const;
    QDateTime toDateTime() const;
    QList<QVariant> toList() const;
    QMap<QString, QVariant> toMap() const;

#ifndef QT_NO_GEOM_VARIANT
    QPoint toPoint() const;
    QPointF toPointF() const;
    QRect toRect() const;
    QSize toSize() const;
    QSizeF toSizeF() const;
    QLine toLine() const;
    QLineF toLineF() const;
    QRectF toRectF() const;
#endif
    QUrl toUrl() const;
    QLocale toLocale() const;
    QRegExp toRegExp() const;

#ifdef QT3_SUPPORT
    inline QT3_SUPPORT int &asInt();
    inline QT3_SUPPORT uint &asUInt();
    inline QT3_SUPPORT qlonglong &asLongLong();
    inline QT3_SUPPORT qulonglong &asULongLong();
    inline QT3_SUPPORT bool &asBool();
    inline QT3_SUPPORT double &asDouble();
    inline QT3_SUPPORT QByteArray &asByteArray();
    inline QT3_SUPPORT QBitArray &asBitArray();
    inline QT3_SUPPORT QString &asString();
    inline QT3_SUPPORT QStringList &asStringList();
    inline QT3_SUPPORT QDate &asDate();
    inline QT3_SUPPORT QTime &asTime();
    inline QT3_SUPPORT QDateTime &asDateTime();
    inline QT3_SUPPORT QList<QVariant> &asList();
    inline QT3_SUPPORT QMap<QString,QVariant> &asMap();
    inline QT3_SUPPORT QPoint &asPoint();
    inline QT3_SUPPORT QRect &asRect();
    inline QT3_SUPPORT QSize &asSize();
#endif //QT3_SUPPORT

#ifndef QT_NO_DATASTREAM
    void load(QDataStream &ds);
    void save(QDataStream &ds) const;
#endif
    static const char *typeToName(Type type);
    static Type nameToType(const char *name);

#ifdef QT3_SUPPORT
    inline QT3_SUPPORT_CONSTRUCTOR QVariant(bool val, int) { create(Bool, &val); }
    inline QT3_SUPPORT const QByteArray toCString() const { return toByteArray(); }
    inline QT3_SUPPORT QByteArray &asCString() { return *reinterpret_cast<QByteArray *>(castOrDetach(ByteArray)); }
#endif

    void *data();
    const void *constData() const;
    inline const void *data() const { return constData(); }

#ifndef QT_NO_MEMBER_TEMPLATES
    template<typename T>
    inline void setValue(const T &value);

    template<typename T>
    inline T value() const
    { return qVariantValue<T>(*this); }

    template<typename T>
    static inline QVariant fromValue(const T &value)
    { return qVariantFromValue(value); }

    template<typename T>
    bool canConvert() const
    { return qVariantCanConvert<T>(*this); }
#endif

 public:
#ifndef qdoc
    struct PrivateShared
    {
        inline PrivateShared() : ref(1) { }
        inline PrivateShared(void *v) : ref(1) { ptr = v; }
        void *ptr;
        QAtomic ref;
    };
    struct Private
    {
        inline Private(): type(Invalid), is_shared(false), is_null(true) { data.ptr = 0; }
        inline Private(const Private &other)
            : data(other.data), type(other.type),
              is_shared(other.is_shared), is_null(other.is_null)
        {}
        union Data
        {
            int i;
            uint u;
            bool b;
            double d;
            qlonglong ll;
            qulonglong ull;
            void *ptr;
            PrivateShared *shared;
        } data;
        uint type : 30;
        uint is_shared : 1;
        uint is_null : 1;
    };
 public:
    typedef void (*f_construct)(Private *, const void *);
    typedef void (*f_clear)(Private *);
    typedef bool (*f_null)(const Private *);
#ifndef QT_NO_DATASTREAM
    typedef void (*f_load)(Private *, QDataStream &);
    typedef void (*f_save)(const Private *, QDataStream &);
#endif