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138 lines
3.1 KiB
C++
138 lines
3.1 KiB
C++
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/*
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KLayout Layout Viewer
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Copyright (C) 2006-2017 Matthias Koefferlein
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef HDR_tlFileSystemWatcher
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#define HDR_tlFileSystemWatcher
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#include "tlEvents.h"
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#include <QObject>
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#include <QDateTime>
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#include <map>
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#include <string>
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class QTimer;
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namespace tl
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{
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/**
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* @brief A file system watcher, similar to QFileSystemWatcher
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* The advantage of this object is to be less resource intensive.
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* Thousands of files can be added, but delay between detection of file
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* system updates and signals can increase.
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*/
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class TL_PUBLIC FileSystemWatcher
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: public QObject
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{
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Q_OBJECT
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public:
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/**
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* @brief Constructor
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*/
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FileSystemWatcher (QObject *parent = 0);
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/**
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* @brief Enables or disables the file watcher
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*/
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void enable (bool en);
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/**
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* @brief Sets the batch size (the number of files checked per timer event)
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* The default batch size is 100.
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*/
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void set_batch_size (size_t n);
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/**
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* @brief Gets the batch size
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*/
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size_t batch_size () const
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{
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return m_batch_size;
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}
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/**
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* @brief Clears the file watcher
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*/
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void clear ();
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/**
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* @brief Adds a file for being watched
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* Files can be added multiple times. In that case they need to be removed the same
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* number of times before they really disappear.
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*/
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void add_file (const std::string &path);
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/**
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* @brief Removes a file from the list of files to watch
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* See \add_file for details.
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*/
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void remove_file (const std::string &path);
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/**
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* @brief This event is triggered after the given file has changed
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*/
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tl::event<const std::string &> file_changed;
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/**
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* @brief This event is triggered after the given file has been removed
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*/
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tl::event<const std::string &> file_removed;
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signals:
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/**
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* @brief An alternative, Qt-style signal for file_removed
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*/
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void fileRemoved (const QString &path);
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/**
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* @brief An alternative, Qt-style signal for file_changed
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*/
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void fileChanged (const QString &path);
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private slots:
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void timeout ();
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private:
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struct FileEntry {
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FileEntry () : refcount (0), size (0) { }
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FileEntry (int r, size_t s, const QDateTime &t) : refcount (r), size (s), time (t) { }
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int refcount;
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size_t size;
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QDateTime time;
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};
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QTimer *m_timer;
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size_t m_batch_size;
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std::map<std::string, FileEntry> m_files;
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size_t m_index;
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std::map<std::string, FileEntry>::iterator m_iter;
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};
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}
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#endif
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