src/kitemviews/private/kdirectorycontentscounter.h

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *   Copyright (C) 2013 by Frank Reininghaus <frank78ac@googlemail.com>    *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  19  ***************************************************************************/
  20
  21 #ifndef KDIRECTORYCONTENTSCOUNTER_H
  22 #define KDIRECTORYCONTENTSCOUNTER_H
  23
  24 #include "kdirectorycontentscounterworker.h"
  25
  26 #include <QSet>
  27 #include <QHash>
  28
  29 class KDirWatch;
  30 class KFileItemModel;
  31 class QString;
  32
  33 class KDirectoryContentsCounter : public QObject
  34 {
  35     Q_OBJECT
  36
  37 public:
  38     explicit KDirectoryContentsCounter(KFileItemModel* model, QObject* parent = nullptr);
  39     ~KDirectoryContentsCounter() override;
  40
  41     /**
  42      * Requests the number of items inside the directory \a path. The actual
  43      * counting is done asynchronously, and the result is announced via the
  44      * signal \a result.
  45      *
  46      * The directory \a path is watched for changes, and the signal is emitted
  47      * again if a change occurs.
  48      *
  49      * Uses a cache internally to speed up first result,
  50      * but emit again result when the cache was updated
  51      */
  52     void scanDirectory(const QString& path);
  53
  54 signals:
  55     /**
  56      * Signals that the directory \a path contains \a count items of size \a
  57      * Size calculation depends on parameter DetailsModeSettings::recursiveDirectorySizeLimit
  58      */
  59     void result(const QString& path, int count, long size);
  60
  61     void requestDirectoryContentsCount(const QString& path, KDirectoryContentsCounterWorker::Options options);
  62
  63 private slots:
  64     void slotResult(const QString& path, int count, long size);
  65     void slotDirWatchDirty(const QString& path);
  66     void slotItemsRemoved();
  67
  68 private:
  69     void startWorker(const QString& path);
  70
  71 private:
  72     KFileItemModel* m_model;
  73
  74     // Used as FIFO queues.
  75     std::list<QString> m_priorityQueue;
  76     std::list<QString> m_queue;
  77
  78     static QThread* m_workerThread;
  79
  80     KDirectoryContentsCounterWorker* m_worker;
  81     bool m_workerIsBusy;
  82
  83     KDirWatch* m_dirWatcher;
  84     QSet<QString> m_watchedDirs;    // Required as sadly KDirWatch does not offer a getter method
  85                                     // to get all watched directories.
  86 };
  87
  88 #endif