src/statusbarspaceinfo.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Peter Penz (peter.penz@gmx.at) and              *
   3  *   and Patrice Tremblay                                                  *
   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 #include "statusbarspaceinfo.h"
  22
  23 #include <kcolorscheme.h>
  24 #include <kdiskfreespace.h>
  25 #include <kmountpoint.h>
  26 #include <klocale.h>
  27 #include <kio/job.h>
  28
  29 #include <QTimer>
  30 #include <QPainter>
  31 #include <QKeyEvent>
  32
  33 StatusBarSpaceInfo::StatusBarSpaceInfo(QWidget* parent) :
  34     QWidget(parent),
  35     m_gettingSize(false),
  36     m_kBSize(0),
  37     m_kBAvailable(0)
  38 {
  39     setMinimumWidth(200);
  40
  41     QPalette palette;
  42     palette.setColor(QPalette::Background, Qt::transparent);
  43     setPalette(palette);
  44
  45     // Update the space information each 10 seconds. Polling is useful
  46     // here, as files can be deleted/added outside the scope of Dolphin.
  47     QTimer* timer = new QTimer(this);
  48     connect(timer, SIGNAL(timeout()), this, SLOT(refresh()));
  49     timer->start(10000);
  50 }
  51
  52 StatusBarSpaceInfo::~StatusBarSpaceInfo()
  53 {
  54 }
  55
  56 void StatusBarSpaceInfo::setUrl(const KUrl& url)
  57 {
  58     m_url = url;
  59     refresh();
  60     QTimer::singleShot(300, this, SLOT(update()));
  61 }
  62
  63 void StatusBarSpaceInfo::paintEvent(QPaintEvent* /* event */)
  64 {
  65     QPainter painter(this);
  66     const int barWidth = width();
  67     const int barTop = 1;
  68     const int barHeight = height() - 5;
  69
  70     QString text;
  71
  72     const int widthDec = 3;  // visual decrement for the available width
  73
  74     QColor frameColor = palette().brush(QPalette::Background).color();
  75     frameColor.setAlpha(128);
  76     painter.setPen(frameColor);
  77
  78     const QColor backgrColor = KColorScheme(KColorScheme::View).background();
  79     painter.setBrush(backgrColor);
  80
  81     painter.drawRect(QRect(0, barTop + 1 , barWidth - widthDec, barHeight));
  82
  83     if ((m_kBSize > 0) && (m_kBAvailable > 0)) {
  84         // draw 'used size' bar
  85         painter.setPen(Qt::NoPen);
  86         painter.setBrush(progressColor(backgrColor));
  87         int usedWidth = barWidth - static_cast<int>((m_kBAvailable *
  88                         static_cast<float>(barWidth)) / m_kBSize);
  89         const int left = 1;
  90         int right = usedWidth - widthDec;
  91         if (right < left) {
  92             right = left;
  93         }
  94         painter.drawRect(QRect(left, barTop + 2, right, barHeight - 1));
  95
  96         text = i18nc("@info:status", "%1 free", KIO::convertSizeFromKiB(m_kBAvailable));
  97     } else {
  98         if (m_gettingSize) {
  99             text = i18nc("@info:status", "Getting size...");
 100         } else {
 101             text = QString();
 102             QTimer::singleShot(0, this, SLOT(hide()));
 103         }
 104     }
 105
 106     // draw text
 107     painter.setPen(KColorScheme(KColorScheme::View).foreground());
 108     painter.drawText(QRect(1, 1, barWidth - 2, barHeight + 6),
 109                      Qt::AlignCenter | Qt::TextWordWrap,
 110                      text);
 111 }
 112
 113
 114 void StatusBarSpaceInfo::slotFoundMountPoint(const QString& mountPoint,
 115                                              quint64 kBSize,
 116                                              quint64 kBUsed,
 117                                              quint64 kBAvailable)
 118 {
 119     Q_UNUSED(kBUsed);
 120     Q_UNUSED(mountPoint);
 121
 122     m_gettingSize = false;
 123     m_kBSize = kBSize;
 124     m_kBAvailable = kBAvailable;
 125
 126     update();
 127 }
 128
 129 void StatusBarSpaceInfo::showResult()
 130 {
 131     m_gettingSize = false;
 132     update();
 133 }
 134
 135 void StatusBarSpaceInfo::refresh()
 136 {
 137     m_kBSize = 0;
 138     m_kBAvailable = 0;
 139
 140     // KDiskFreeSpace is for local paths only
 141     if (!m_url.isLocalFile()) {
 142         return;
 143     }
 144
 145     m_gettingSize = true;
 146     KMountPoint::Ptr mp = KMountPoint::currentMountPoints().findByPath(m_url.path());
 147     if (!mp)
 148         return;
 149
 150     KDiskFreeSpace* job = new KDiskFreeSpace(this);
 151     connect(job, SIGNAL(foundMountPoint(const QString&,
 152                                         quint64,
 153                                         quint64,
 154                                         quint64)),
 155             this, SLOT(slotFoundMountPoint(const QString&,
 156                                            quint64,
 157                                            quint64,
 158                                            quint64)));
 159     connect(job, SIGNAL(done()),
 160             this, SLOT(showResult()));
 161
 162     job->readDF(mp->mountPoint());
 163 }
 164
 165 QColor StatusBarSpaceInfo::progressColor(const QColor& bgColor) const
 166 {
 167     QColor color = KColorScheme(KColorScheme::Button).background();
 168
 169     // assure that enough contrast is given between the background color
 170     // and the progressbar color
 171     int bgRed   = bgColor.red();
 172     int bgGreen = bgColor.green();
 173     int bgBlue  = bgColor.blue();
 174
 175     const int backgrBrightness = qGray(bgRed, bgGreen, bgBlue);
 176     const int progressBrightness = qGray(color.red(), color.green(), color.blue());
 177
 178     const int limit = 32;
 179     const int diff = backgrBrightness - progressBrightness;
 180     bool adjustColor = ((diff >= 0) && (diff <  limit)) ||
 181                        ((diff  < 0) && (diff > -limit));
 182     if (adjustColor) {
 183         const int inc = (backgrBrightness < 2 * limit) ? (2 * limit) : -limit;
 184         color = QColor(bgRed + inc, bgGreen + inc, bgBlue + inc);
 185     }
 186
 187     return color;
 188 }
 189
 190 #include "statusbarspaceinfo.moc"