src/search/filters/ratingsearchfilterwidget.cpp

   1 /***************************************************************************
   2 *    Copyright (C) 2010 by Peter Penz <peter.penz19@gmail.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 "ratingsearchfilterwidget.h"
  21
  22 #include <klocale.h>
  23 #include <nepomuk/comparisonterm.h>
  24 #include <nepomuk/literalterm.h>
  25 #include <nepomuk/orterm.h>
  26 #include <nepomuk/kratingpainter.h>
  27 #include <nepomuk/property.h>
  28 #include <nepomuk/query.h>
  29 #include "nie.h"
  30 #include <Soprano/LiteralValue>
  31 #include <Soprano/Vocabulary/NAO>
  32 #include <QFontMetrics>
  33 #include <QIcon>
  34 #include <QLabel>
  35 #include <QPainter>
  36 #include <QPushButton>
  37 #include <QHBoxLayout>
  38
  39 namespace {
  40     // Only show the ratings 0, 2, 4, ... 10
  41     const int RatingInc = 2;
  42 };
  43
  44 RatingSearchFilterWidget::RatingSearchFilterWidget(QWidget* parent) :
  45     AbstractSearchFilterWidget(parent),
  46     m_ratingButtons()
  47 {
  48     QHBoxLayout* layout = new QHBoxLayout(this);
  49     layout->setSpacing(0);
  50
  51     QFontMetrics fontMetrics(font());
  52     const int iconHeight = fontMetrics.height();
  53
  54     KRatingPainter ratingPainter;
  55     const int maxRating = ratingPainter.maxRating();
  56     const QSize iconSize(iconHeight * (maxRating / 2), iconHeight);
  57     const QRect paintRect(QPoint(0, 0), iconSize);
  58
  59     for (int rating = 0; rating <= ratingPainter.maxRating(); rating += RatingInc) {
  60         // Create pixmap that represents the rating
  61         QPixmap pixmap(iconSize);
  62         pixmap.fill(Qt::transparent);
  63         QPainter painter(&pixmap);
  64         ratingPainter.paint(&painter, paintRect, rating);
  65
  66         // Create button with the rating pixmap as icon
  67         QPushButton* button = createButton();
  68         button->setIconSize(iconSize);
  69         button->setIcon(QIcon(pixmap));
  70
  71         layout->addWidget(button);
  72         m_ratingButtons.append(button);
  73     }
  74
  75     layout->addStretch(1);
  76 }
  77
  78 RatingSearchFilterWidget::~RatingSearchFilterWidget()
  79 {
  80 }
  81
  82 QString RatingSearchFilterWidget::filterLabel() const
  83 {
  84     return i18nc("@title:group", "Rating");
  85 }
  86
  87 Nepomuk::Query::Term RatingSearchFilterWidget::queryTerm() const
  88 {
  89     Nepomuk::Query::OrTerm orTerm;
  90
  91     int rating = 0;
  92     foreach (const QPushButton* ratingButton, m_ratingButtons) {
  93         if (ratingButton->isChecked()) {
  94             const Nepomuk::Query::LiteralTerm term(rating);
  95             const Nepomuk::Query::ComparisonTerm compTerm(Soprano::Vocabulary::NAO::numericRating(),
  96                                                           term,
  97                                                           Nepomuk::Query::ComparisonTerm::Equal);
  98             orTerm.addSubTerm(compTerm);
  99         }
 100         rating += RatingInc;
 101     }
 102
 103     return orTerm;
 104 }
 105
 106 #include "ratingsearchfilterwidget.moc"