src/statusbar/spaceinfoobserver.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2014 by Frank Reininghaus <frank78ac@googlemail.com>    *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
  18  ***************************************************************************/
  19
  20 #include "spaceinfoobserver.h"
  21
  22 #include "mountpointobserver.h"
  23
  24 SpaceInfoObserver::SpaceInfoObserver(const QUrl& url, QObject* parent) :
  25     QObject(parent),
  26     m_mountPointObserver(nullptr),
  27     m_hasData(false),
  28     m_dataSize(0),
  29     m_dataAvailable(0)
  30 {
  31     m_mountPointObserver = MountPointObserver::observerForUrl(url);
  32     m_mountPointObserver->ref();
  33     connect(m_mountPointObserver, &MountPointObserver::spaceInfoChanged, this, &SpaceInfoObserver::spaceInfoChanged);
  34     m_mountPointObserver->update();
  35 }
  36
  37 SpaceInfoObserver::~SpaceInfoObserver()
  38 {
  39     if (m_mountPointObserver) {
  40         m_mountPointObserver->deref();
  41         m_mountPointObserver = nullptr;
  42     }
  43 }
  44
  45 quint64 SpaceInfoObserver::size() const
  46 {
  47     return m_dataSize;
  48 }
  49
  50 quint64 SpaceInfoObserver::available() const
  51 {
  52     return m_dataAvailable;
  53 }
  54
  55 void SpaceInfoObserver::setUrl(const QUrl& url)
  56 {
  57     MountPointObserver* newObserver = MountPointObserver::observerForUrl(url);
  58     if (newObserver != m_mountPointObserver) {
  59         if (m_mountPointObserver) {
  60             disconnect(m_mountPointObserver, &MountPointObserver::spaceInfoChanged, this, &SpaceInfoObserver::spaceInfoChanged);
  61             m_mountPointObserver->deref();
  62             m_mountPointObserver = nullptr;
  63         }
  64
  65         m_mountPointObserver = newObserver;
  66         m_mountPointObserver->ref();
  67         connect(m_mountPointObserver, &MountPointObserver::spaceInfoChanged, this, &SpaceInfoObserver::spaceInfoChanged);
  68
  69         // If newObserver is cached it won't call update until the next timer update,
  70         // so update the observer now.
  71         m_mountPointObserver->update();
  72     }
  73 }
  74
  75 void SpaceInfoObserver::update()
  76 {
  77     if (m_mountPointObserver) {
  78         m_mountPointObserver->update();
  79     }
  80 }
  81
  82 void SpaceInfoObserver::spaceInfoChanged(quint64 size, quint64 available)
  83 {
  84     // Make sure that the size has actually changed
  85     if (m_dataSize != size || m_dataAvailable != available || !m_hasData) {
  86         m_hasData = true;
  87         m_dataSize = size;
  88         m_dataAvailable = available;
  89
  90         emit valuesChanged();
  91     }
  92 }