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 <kcategorizedsortfilterproxymodel.h>
  27
  28 KCategoryDrawer::KCategoryDrawer()
  29 {
  30 }
  31
  32 KCategoryDrawer::~KCategoryDrawer()
  33 {
  34 }
  35
  36 void KCategoryDrawer::drawCategory(const QModelIndex &index,
  37                                    int sortRole,
  38                                    const QStyleOption &option,
  39                                    QPainter *painter) const
  40 {
  41     const QString category = index.model()->data(index, KCategorizedSortFilterProxyModel::CategoryDisplayRole).toString();
  42
  43     QColor color;
  44
  45     if (option.state & QStyle::State_Selected)
  46     {
  47         color = option.palette.color(QPalette::HighlightedText);
  48     }
  49     else
  50     {
  51         color = option.palette.color(QPalette::Text);
  52     }
  53
  54     painter->save();
  55     painter->setRenderHint(QPainter::Antialiasing);
  56
  57     QStyleOptionButton opt;
  58
  59     opt.rect = option.rect;
  60     opt.palette = option.palette;
  61     opt.direction = option.direction;
  62     opt.text = category;
  63
  64     if (option.state & QStyle::State_Selected)
  65     {
  66         QColor selected = option.palette.color(QPalette::Highlight);
  67
  68         QLinearGradient gradient(option.rect.topLeft(),
  69                                  option.rect.bottomRight());
  70         gradient.setColorAt(option.direction == Qt::LeftToRight ? 0
  71                                                                 : 1, selected);
  72         gradient.setColorAt(option.direction == Qt::LeftToRight ? 1
  73                                                                 : 0, Qt::transparent);
  74
  75         painter->fillRect(option.rect, gradient);
  76     }
  77     else if (option.state & QStyle::State_MouseOver)
  78     {
  79         QColor hover = option.palette.color(QPalette::Highlight).light();
  80         hover.setAlpha(88);
  81
  82         QLinearGradient gradient(option.rect.topLeft(),
  83                                  option.rect.bottomRight());
  84         gradient.setColorAt(option.direction == Qt::LeftToRight ? 0
  85                                                                 : 1, hover);
  86         gradient.setColorAt(option.direction == Qt::LeftToRight ? 1
  87                                                                 : 0, Qt::transparent);
  88
  89         painter->fillRect(option.rect, gradient);
  90     }
  91
  92     QFont painterFont = painter->font();
  93     painterFont.setWeight(QFont::Bold);
  94     painterFont.setPointSize(painterFont.pointSize() + 2);
  95     QFontMetrics metrics(painterFont);
  96     painter->setFont(painterFont);
  97
  98     QPainterPath path;
  99     path.addRect(option.rect.left(),
 100                  option.rect.bottom() - 2,
 101                  option.rect.width(),
 102                  2);
 103
 104     QLinearGradient gradient(option.rect.topLeft(),
 105                              option.rect.bottomRight());
 106     gradient.setColorAt(option.direction == Qt::LeftToRight ? 0
 107                                                             : 1, color);
 108     gradient.setColorAt(option.direction == Qt::LeftToRight ? 1
 109                                                             : 0, Qt::transparent);
 110
 111     painter->setBrush(gradient);
 112     painter->fillPath(path, gradient);
 113
 114     painter->setPen(color);
 115
 116     painter->drawText(option.rect, Qt::AlignVCenter | Qt::AlignLeft,
 117     metrics.elidedText(category, Qt::ElideRight, option.rect.width()));
 118
 119     painter->restore();
 120 }
 121
 122 int KCategoryDrawer::categoryHeight(const QStyleOption &option) const
 123 {
 124     return option.fontMetrics.height() + 6 /* 4 separator; 2 gradient */;
 125 }