qfileinfogatherer_p.h

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// Copyright (C) 2016 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 QFILEINFOGATHERER_H
#define QFILEINFOGATHERER_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 <QtGui/private/qtguiglobal_p.h>
 
#include <qthread.h>
#include <qmutex.h>
#include <qwaitcondition.h>
#if QT_CONFIG(filesystemwatcher)
#include <qfilesystemwatcher.h>
#endif
#include <qabstractfileiconprovider.h>
#include <qpair.h>
#include <qstack.h>
#include <qdatetime.h>
#include <qdir.h>
#include <qelapsedtimer.h>
 
#include <private/qfilesystemengine_p.h>
 
QT_REQUIRE_CONFIG(filesystemmodel);
 
QT_BEGIN_NAMESPACE
 
class QExtendedInformation {
public:
    enum Type { Dir, File, System };
 
    QExtendedInformation() {}
    QExtendedInformation(const QFileInfo &info) : mFileInfo(info) {}
 
    inline bool isDir() { return type() == Dir; }
    inline bool isFile() { return type() == File; }
    inline bool isSystem() { return type() == System; }
 
    bool operator ==(const QExtendedInformation &fileInfo) const {
       return mFileInfo == fileInfo.mFileInfo
       && displayType == fileInfo.displayType
       && permissions() == fileInfo.permissions()
       && lastModified(QTimeZone::UTC) == fileInfo.lastModified(QTimeZone::UTC);
    }
 
#ifndef QT_NO_FSFILEENGINE
    bool isCaseSensitive() const {
        return QFileSystemEngine::isCaseSensitive();
    }
#endif
 
    QFile::Permissions permissions() const {
        return mFileInfo.permissions();
    }
 
    Type type() const {
        if (mFileInfo.isDir()) {
            return QExtendedInformation::Dir;
        }
        if (mFileInfo.isFile()) {
            return QExtendedInformation::File;
        }
        if (!mFileInfo.exists() && mFileInfo.isSymLink()) {
            return QExtendedInformation::System;
        }
        return QExtendedInformation::System;
    }
 
    bool isSymLink(bool ignoreNtfsSymLinks = false) const
    {
        if (ignoreNtfsSymLinks) {
#ifdef Q_OS_WIN
            return !mFileInfo.suffix().compare(QLatin1StringView("lnk"), Qt::CaseInsensitive);
#endif
        }
        return mFileInfo.isSymLink();
    }
 
    bool isHidden() const {
        return mFileInfo.isHidden();
    }
 
    QFileInfo fileInfo() const {
        return mFileInfo;
    }
 
    QDateTime lastModified(const QTimeZone &tz) const {
        return mFileInfo.lastModified(tz);
    }
 
    qint64 size() const {
        qint64 size = -1;
        if (type() == QExtendedInformation::Dir)
            size = 0;
        if (type() == QExtendedInformation::File)
            size = mFileInfo.size();
        if (!mFileInfo.exists() && !mFileInfo.isSymLink())
            size = -1;
        return size;
    }
 
    QString displayType;
    QIcon icon;
 
private :
    QFileInfo mFileInfo;
};
 
class QFileIconProvider;
 
class Q_GUI_EXPORT QFileInfoGatherer : public QThread
{
Q_OBJECT
 
Q_SIGNALS:
    void updates(const QString &directory, const QList<QPair<QString, QFileInfo>> &updates);
    void newListOfFiles(const QString &directory, const QStringList &listOfFiles) const;
    void nameResolved(const QString &fileName, const QString &resolvedName) const;
    void directoryLoaded(const QString &path);
 
public:
    explicit QFileInfoGatherer(QObject *parent = nullptr);
    ~QFileInfoGatherer();
 
    QStringList watchedFiles() const;
    QStringList watchedDirectories() const;
    void watchPaths(const QStringList &paths);
    void unwatchPaths(const QStringList &paths);
 
    bool isWatching() const;
    void setWatching(bool v);
 
    // only callable from this->thread():
    void clear();
    void removePath(const QString &path);
    QExtendedInformation getInfo(const QFileInfo &info) const;
    QAbstractFileIconProvider *iconProvider() const;
    bool resolveSymlinks() const;
 
public Q_SLOTS:
    void list(const QString &directoryPath);
    void fetchExtendedInformation(const QString &path, const QStringList &files);
    void updateFile(const QString &path);
    void setResolveSymlinks(bool enable);
    void setIconProvider(QAbstractFileIconProvider *provider);
 
private Q_SLOTS:
    void driveAdded();
    void driveRemoved();
 
private:
    void run() override;
    // called by run():
    void getFileInfos(const QString &path, const QStringList &files);
    void fetch(const QFileInfo &info, QElapsedTimer &base, bool &firstTime,
               QList<QPair<QString, QFileInfo>> &updatedFiles, const QString &path);
 
private:
    void createWatcher();
 
    mutable QMutex mutex;
    // begin protected by mutex
    QWaitCondition condition;
    QStack<QString> path;
    QStack<QStringList> files;
    // end protected by mutex
    QAtomicInt abort;
 
#if QT_CONFIG(filesystemwatcher)
    QFileSystemWatcher *m_watcher = nullptr;
#endif
    QAbstractFileIconProvider *m_iconProvider; // not accessed by run()
    QAbstractFileIconProvider defaultProvider;
#ifdef Q_OS_WIN
    bool m_resolveSymlinks = true; // not accessed by run()
#endif
#if QT_CONFIG(filesystemwatcher)
    bool m_watching = true;
#endif
};
 
QT_END_NAMESPACE
#endif // QFILEINFOGATHERER_H