qt-everywhere-src-5.15.1/qtbase/src/corelib/io/qfilesystemwatcher_polling_p.h

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#ifndef QFILESYSTEMWATCHER_POLLING_P_H
#define QFILESYSTEMWATCHER_POLLING_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/qfileinfo.h>
#include <QtCore/qmutex.h>
#include <QtCore/qdatetime.h>
#include <QtCore/qdir.h>
#include <QtCore/qtimer.h>
#include <QtCore/qhash.h>

#include "qfilesystemwatcher_p.h"

QT_REQUIRE_CONFIG(filesystemwatcher);
QT_BEGIN_NAMESPACE

enum { PollingInterval = 1000 };

class QPollingFileSystemWatcherEngine : public QFileSystemWatcherEngine
{
    Q_OBJECT

    class FileInfo
    {
        uint ownerId;
        uint groupId;
        QFile::Permissions permissions;
        QDateTime lastModified;
        QStringList entries;

    public:
        FileInfo(const QFileInfo &fileInfo)
            : ownerId(fileInfo.ownerId()),
              groupId(fileInfo.groupId()),
              permissions(fileInfo.permissions()),
              lastModified(fileInfo.lastModified())
        {
            if (fileInfo.isDir()) {
                entries = fileInfo.absoluteDir().entryList(QDir::AllEntries);
            }
        }
        FileInfo &operator=(const QFileInfo &fileInfo)
        {
            *this = FileInfo(fileInfo);
            return *this;
        }

        bool operator!=(const QFileInfo &fileInfo) const
        {
            if (fileInfo.isDir() && entries != fileInfo.absoluteDir().entryList(QDir::AllEntries))
                return true;
            return (ownerId != fileInfo.ownerId()
                    || groupId != fileInfo.groupId()
                    || permissions != fileInfo.permissions()
                    || lastModified != fileInfo.lastModified());
        }
    };

    QHash<QString, FileInfo> files, directories;

public:
    QPollingFileSystemWatcherEngine(QObject *parent);

    QStringList addPaths(const QStringList &paths, QStringList *files, QStringList *directories) override;
    QStringList removePaths(const QStringList &paths, QStringList *files, QStringList *directories) override;

private Q_SLOTS:
    void timeout();

private:
    QTimer timer;
};

QT_END_NAMESPACE
#endif // QFILESYSTEMWATCHER_POLLING_P_H