src/kcategorydrawer.cpp

   1 /**
   2   * This file is part of the KDE project
   3   * Copyright (C) 2007 Rafael Fernández López <ereslibre@kde.org>
   4   *
   5   * This library is free software; you can redistribute it and/or
   6   * modify it under the terms of the GNU Library General Public
   7   * License as published by the Free Software Foundation; either
   8   * version 2 of the License, or (at your option) any later version.
   9   *
  10   * This library 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 GNU
  13   * Library General Public License for more details.
  14   *
  15   * You should have received a copy of the GNU Library General Public License
  16   * along with this library; see the file COPYING.LIB.  If not, write to
  17   * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18   * Boston, MA 02110-1301, USA.
  19   */
  20
  21 #include "kcategorydrawer.h"
  22
  23 #include <QPainter>
  24 #include <QStyleOption>
  25
  26 #include <kiconloader.h>
  27 #include <kcategorizedsortfilterproxymodel.h>
  28
  29 KCategoryDrawer::KCategoryDrawer()
  30 {
  31 }
  32
  33 KCategoryDrawer::~KCategoryDrawer()
  34 {
  35 }
  36
  37 void KCategoryDrawer::drawCategory(const QModelIndex &index,
  38                                    int sortRole,
  39                                    const QStyleOption &option,
  40                                    QPainter *painter) const
  41 {
  42     const QString category = index.model()->data(index, KCategorizedSortFilterProxyModel::CategoryDisplayRole).toString();
  43
  44     QColor color;
  45
  46     if (option.state & QStyle::State_Selected)
  47     {
  48         color = option.palette.color(QPalette::HighlightedText);
  49     }
  50     else
  51     {
  52         color = option.palette.color(QPalette::Text);
  53     }
  54
  55     painter->save();
  56     painter->setRenderHint(QPainter::Antialiasing);
  57
  58     QStyleOptionButton opt;
  59
  60     opt.rect = option.rect;
  61     opt.palette = option.palette;
  62     opt.direction = option.direction;
  63     opt.text = category;
  64
  65     int iconSize = KIconLoader::global()->currentSize(KIconLoader::Small);
  66
  67     if (option.direction == Qt::LeftToRight)
  68     {
  69         opt.rect.setLeft(opt.rect.left() + (iconSize / 4));
  70     }
  71     else
  72     {
  73         opt.rect.setRight(opt.rect.width() - (iconSize / 4));
  74     }
  75
  76     if (option.state & QStyle::State_Selected)
  77     {
  78         QColor selected = option.palette.color(QPalette::Highlight);
  79
  80         QLinearGradient gradient(option.rect.topLeft(),
  81                                  option.rect.bottomRight());
  82         gradient.setColorAt(option.direction == Qt::LeftToRight ? 0
  83                                                                 : 1, selected);
  84         gradient.setColorAt(option.direction == Qt::LeftToRight ? 1
  85                                                                 : 0, Qt::transparent);
  86
  87         painter->fillRect(option.rect, gradient);
  88     }
  89     else if (option.state & QStyle::State_MouseOver)
  90     {
  91         QColor hover = option.palette.color(QPalette::Highlight).light();
  92         hover.setAlpha(88);
  93
  94         QLinearGradient gradient(option.rect.topLeft(),
  95                                  option.rect.bottomRight());
  96         gradient.setColorAt(option.direction == Qt::LeftToRight ? 0
  97                                                                 : 1, hover);
  98         gradient.setColorAt(option.direction == Qt::LeftToRight ? 1
  99                                                                 : 0, Qt::transparent);
 100
 101         painter->fillRect(option.rect, gradient);
 102     }
 103
 104     QFont painterFont = painter->font();
 105     painterFont.setWeight(QFont::Bold);
 106     painterFont.setPointSize(painterFont.pointSize() + 2);
 107     QFontMetrics metrics(painterFont);
 108     painter->setFont(painterFont);
 109
 110     QPainterPath path;
 111     path.addRect(option.rect.left(),
 112                  option.rect.bottom() - 2,
 113                  option.rect.width(),
 114                  2);
 115
 116     QLinearGradient gradient(option.rect.topLeft(),
 117                              option.rect.bottomRight());
 118     gradient.setColorAt(option.direction == Qt::LeftToRight ? 0
 119                                                             : 1, color);
 120     gradient.setColorAt(option.direction == Qt::LeftToRight ? 1
 121                                                             : 0, Qt::transparent);
 122
 123     painter->setBrush(gradient);
 124     painter->fillPath(path, gradient);
 125
 126     painter->setPen(color);
 127
 128     painter->drawText(opt.rect, Qt::AlignVCenter | Qt::AlignLeft,
 129     metrics.elidedText(category, Qt::ElideRight, option.rect.width()));
 130
 131     painter->restore();
 132 }
 133
 134 int KCategoryDrawer::categoryHeight(const QStyleOption &option) const
 135 {
 136     return option.fontMetrics.height() + 6 /* 4 separator; 2 gradient */;
 137 }