qsettings.h

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QSETTINGS_H
#define QSETTINGS_H
 
#include <QtCore/qobject.h>
#include <QtCore/qvariant.h>
#include <QtCore/qstring.h>
#include <QtCore/qscopedpointer.h>
 
QT_REQUIRE_CONFIG(settings);
 
#include <ctype.h>
 
QT_BEGIN_NAMESPACE
 
#ifdef Status // we seem to pick up a macro Status --> int somewhere
#undef Status
#endif
 
class QIODevice;
class QSettingsPrivate;
 
#ifndef QT_NO_QOBJECT
class Q_CORE_EXPORT QSettings : public QObject
#else
class Q_CORE_EXPORT QSettings
#endif
{
#ifndef QT_NO_QOBJECT
    Q_OBJECT
#else
    QScopedPointer<QSettingsPrivate> d_ptr;
#endif
    Q_DECLARE_PRIVATE(QSettings)
 
public:
    enum Status {
        NoError = 0,
        AccessError,
        FormatError
    };
#ifndef QT_NO_QOBJECT
    Q_ENUM(Status)
#endif
 
    enum Format {
        NativeFormat,
        IniFormat,
 
#if defined(Q_OS_WIN) || defined(Q_QDOC)
        Registry32Format,
        Registry64Format,
#endif
 
#if defined(Q_OS_WASM)
    // FIXME: add public API in next minor release.
    // WebLocalStorageFormat (IniFormat + 1)
    // WebIDBSFormat (IniFormat + 2)
#endif
 
        InvalidFormat = 16,
        CustomFormat1,
        CustomFormat2,
        CustomFormat3,
        CustomFormat4,
        CustomFormat5,
        CustomFormat6,
        CustomFormat7,
        CustomFormat8,
        CustomFormat9,
        CustomFormat10,
        CustomFormat11,
        CustomFormat12,
        CustomFormat13,
        CustomFormat14,
        CustomFormat15,
        CustomFormat16
    };
#ifndef QT_NO_QOBJECT
    Q_ENUM(Format)
#endif
 
    enum Scope {
        UserScope,
        SystemScope
    };
#ifndef QT_NO_QOBJECT
    Q_ENUM(Scope)
#endif
 
#ifndef QT_NO_QOBJECT
    explicit QSettings(const QString &organization,
                       const QString &application = QString(), QObject *parent = nullptr);
    QSettings(Scope scope, const QString &organization,
              const QString &application = QString(), QObject *parent = nullptr);
    QSettings(Format format, Scope scope, const QString &organization,
              const QString &application = QString(), QObject *parent = nullptr);
    QSettings(const QString &fileName, Format format, QObject *parent = nullptr);
    explicit QSettings(QObject *parent = nullptr);
    explicit QSettings(Scope scope, QObject *parent = nullptr);
#else
    explicit QSettings(const QString &organization,
                       const QString &application = QString());
    QSettings(Scope scope, const QString &organization,
              const QString &application = QString());
    QSettings(Format format, Scope scope, const QString &organization,
              const QString &application = QString());
    QSettings(const QString &fileName, Format format);
    explicit QSettings(Scope scope = UserScope);
#endif
    ~QSettings();
 
    void clear();
    void sync();
    Status status() const;
    bool isAtomicSyncRequired() const;
    void setAtomicSyncRequired(bool enable);
 
#if QT_CORE_REMOVED_SINCE(6, 4)
    void beginGroup(const QString &prefix);
#endif
    void beginGroup(QAnyStringView prefix);
    void endGroup();
    QString group() const;
 
#if QT_CORE_REMOVED_SINCE(6, 4)
    int beginReadArray(const QString &prefix);
    void beginWriteArray(const QString &prefix, int size = -1);
#endif
    int beginReadArray(QAnyStringView prefix);
    void beginWriteArray(QAnyStringView prefix, int size = -1);
    void endArray();
    void setArrayIndex(int i);
 
    QStringList allKeys() const;
    QStringList childKeys() const;
    QStringList childGroups() const;
    bool isWritable() const;
 
#if QT_CORE_REMOVED_SINCE(6, 4)
    void setValue(const QString &key, const QVariant &value);
    QVariant value(const QString &key, const QVariant &defaultValue) const;
    QVariant value(const QString &key) const;
#endif
    void setValue(QAnyStringView key, const QVariant &value);
    QVariant value(QAnyStringView key, const QVariant &defaultValue) const;
    QVariant value(QAnyStringView key) const;
 
#if QT_CORE_REMOVED_SINCE(6, 4)
    void remove(const QString &key);
    bool contains(const QString &key) const;
#endif
    void remove(QAnyStringView key);
    bool contains(QAnyStringView key) const;
 
    void setFallbacksEnabled(bool b);
    bool fallbacksEnabled() const;
 
    QString fileName() const;
    Format format() const;
    Scope scope() const;
    QString organizationName() const;
    QString applicationName() const;
 
    static void setDefaultFormat(Format format);
    static Format defaultFormat();
    static void setPath(Format format, Scope scope, const QString &path);
 
    typedef QMap<QString, QVariant> SettingsMap;
    typedef bool (*ReadFunc)(QIODevice &device, SettingsMap &map);
    typedef bool (*WriteFunc)(QIODevice &device, const SettingsMap &map);
 
    static Format registerFormat(const QString &extension, ReadFunc readFunc, WriteFunc writeFunc,
                                 Qt::CaseSensitivity caseSensitivity = Qt::CaseSensitive);
 
protected:
#ifndef QT_NO_QOBJECT
    bool event(QEvent *event) override;
#endif
 
private:
    Q_DISABLE_COPY(QSettings)
};
 
QT_END_NAMESPACE
 
#endif // QSETTINGS_H