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 <QLinkedList>
  27 #include <QSet>
  28 #include <QHash>
  29
  30 class KDirWatch;
  31 class KFileItemModel;
  32 class QString;
  33
  34 class KDirectoryContentsCounter : public QObject
  35 {
  36     Q_OBJECT
  37
  38 public:
  39     explicit KDirectoryContentsCounter(KFileItemModel* model, QObject* parent = nullptr);
  40     ~KDirectoryContentsCounter() override;
  41
  42     /**
  43      * Requests the number of items inside the directory \a path. The actual
  44      * counting is done asynchronously, and the result is announced via the
  45      * signal \a result.
  46      *
  47      * The directory \a path is watched for changes, and the signal is emitted
  48      * again if a change occurs.
  49      *
  50      * Uses a cache internally to speed up first result,
  51      * but emit again result when the cache was updated
  52      */
  53     void scanDirectory(const QString& path);
  54
  55 signals:
  56     /**
  57      * Signals that the directory \a path contains \a count items of size \a
  58      * Size calculation depends on parameter DetailsModeSettings::recursiveDirectorySizeLimit
  59      */
  60     void result(const QString& path, int count, long size);
  61
  62     void requestDirectoryContentsCount(const QString& path, KDirectoryContentsCounterWorker::Options options);
  63
  64 private slots:
  65     void slotResult(const QString& path, int count, long size);
  66     void slotDirWatchDirty(const QString& path);
  67     void slotItemsRemoved();
  68
  69 private:
  70     void startWorker(const QString& path);
  71
  72 private:
  73     KFileItemModel* m_model;
  74
  75     QLinkedList<QString> m_priorityQueue;
  76     QLinkedList<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