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 <QtCore/QTimer>
  24 #include <QtGui/QPainter>
  25 #include <QtGui/QKeyEvent>
  26
  27 #include <kglobalsettings.h>
  28 #include <kdiskfreespace.h>
  29 #include <kmountpoint.h>
  30 #include <klocale.h>
  31 #include <kio/job.h>
  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     // Update the space information each 10 seconds. Polling is useful
  42     // here, as files can be deleted/added outside the scope of Dolphin.
  43     QTimer* timer = new QTimer(this);
  44     connect(timer, SIGNAL(timeout()), this, SLOT(refresh()));
  45     timer->start(10000);
  46 }
  47
  48 StatusBarSpaceInfo::~StatusBarSpaceInfo()
  49 {
  50 }
  51
  52 void StatusBarSpaceInfo::setUrl(const KUrl& url)
  53 {
  54     m_url = url;
  55     refresh();
  56     QTimer::singleShot(300, this, SLOT(update()));
  57 }
  58
  59 void StatusBarSpaceInfo::paintEvent(QPaintEvent* /* event */)
  60 {
  61     QPainter painter(this);
  62     const int barWidth = width();
  63     const int barTop = 1;
  64     const int barHeight = height() - 5;
  65
  66     QString text;
  67
  68     const int widthDec = 3;  // visual decrement for the available width
  69
  70     const QColor c1 = palette().brush(QPalette::Background).color();
  71     const QColor c2 = KGlobalSettings::buttonTextColor();
  72     const QColor frameColor((c1.red()   + c2.red())   / 2,
  73                             (c1.green() + c2.green()) / 2,
  74                             (c1.blue()  + c2.blue())  / 2);
  75     painter.setPen(frameColor);
  76
  77     const QColor backgrColor = KGlobalSettings::baseColor();
  78     painter.setBrush(backgrColor);
  79
  80     painter.drawRect(QRect(0, barTop + 1 , barWidth - widthDec, barHeight));
  81
  82     if ((m_kBSize > 0) && (m_kBAvailable > 0)) {
  83         // draw 'used size' bar
  84         painter.setPen(Qt::NoPen);
  85         painter.setBrush(progressColor(backgrColor));
  86         int usedWidth = barWidth - static_cast<int>((m_kBAvailable *
  87                         static_cast<float>(barWidth)) / m_kBSize);
  88         const int left = 1;
  89         int right = usedWidth - widthDec;
  90         if (right < left) {
  91             right = left;
  92         }
  93         painter.drawRect(QRect(left, barTop + 2, right, barHeight - 1));
  94
  95         text = i18n("%1 free", KIO::convertSizeFromKiB(m_kBAvailable));
  96     } else {
  97         if (m_gettingSize) {
  98             text = i18n("Getting size...");
  99         } else {
 100             text = QString();
 101             QTimer::singleShot(0, this, SLOT(hide()));
 102         }
 103     }
 104
 105     // draw text
 106     painter.setPen(KGlobalSettings::textColor());
 107     painter.drawText(QRect(1, 1, barWidth - 2, barHeight + 6),
 108                      Qt::AlignCenter | Qt::TextWordWrap,
 109                      text);
 110 }
 111
 112
 113 void StatusBarSpaceInfo::slotFoundMountPoint(const unsigned long& kBSize,
 114                                              const unsigned long& kBUsed,
 115                                              const unsigned long& kBAvailable,
 116                                              const QString& mountPoint)
 117 {
 118     Q_UNUSED(kBUsed);
 119     Q_UNUSED(mountPoint);
 120
 121     m_gettingSize = false;
 122     m_kBSize = kBSize;
 123     m_kBAvailable = kBAvailable;
 124
 125     update();
 126 }
 127
 128 void StatusBarSpaceInfo::showResult()
 129 {
 130     m_gettingSize = false;
 131     update();
 132 }
 133
 134 void StatusBarSpaceInfo::refresh()
 135 {
 136     m_kBSize = 0;
 137     m_kBAvailable = 0;
 138
 139     // KDiskFreeSpace is for local paths only
 140     if (!m_url.isLocalFile())
 141         return;
 142
 143     m_gettingSize = true;
 144     KMountPoint::Ptr mp = KMountPoint::currentMountPoints().findByPath(m_url.path());
 145     if (!mp)
 146         return;
 147
 148     KDiskFreeSpace* job = new KDiskFreeSpace(this);
 149     connect(job, SIGNAL(foundMountPoint(const unsigned long&,
 150                                         const unsigned long&,
 151                                         const unsigned long&,
 152                                         const QString&)),
 153             this, SLOT(slotFoundMountPoint(const unsigned long&,
 154                                            const unsigned long&,
 155                                            const unsigned long&,
 156                                            const QString&)));
 157     connect(job, SIGNAL(done()),
 158             this, SLOT(showResult()));
 159
 160     job->readDF(mp->mountPoint());
 161 }
 162
 163 QColor StatusBarSpaceInfo::progressColor(const QColor& bgColor) const
 164 {
 165     QColor color = KGlobalSettings::buttonBackground();
 166
 167     // assure that enough contrast is given between the background color
 168     // and the progressbar color
 169     int bgRed   = bgColor.red();
 170     int bgGreen = bgColor.green();
 171     int bgBlue  = bgColor.blue();
 172
 173     const int backgrBrightness = qGray(bgRed, bgGreen, bgBlue);
 174     const int progressBrightness = qGray(color.red(), color.green(), color.blue());
 175
 176     const int limit = 32;
 177     const int diff = backgrBrightness - progressBrightness;
 178     bool adjustColor = ((diff >= 0) && (diff <  limit)) ||
 179                        ((diff  < 0) && (diff > -limit));
 180     if (adjustColor) {
 181         const int inc = (backgrBrightness < 2 * limit) ? (2 * limit) : -limit;
 182         color = QColor(bgRed + inc, bgGreen + inc, bgBlue + inc);
 183     }
 184
 185     return color;
 186 }
 187
 188 #include "statusbarspaceinfo.moc"