src/kitemviews/kfileitemlistgroupheader.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   Based on the Itemviews NG project from Trolltech Labs:                *
   5  *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
   6  *                                                                         *
   7  *   This program is free software; you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation; either version 2 of the License, or     *
  10  *   (at your option) any later version.                                   *
  11  *                                                                         *
  12  *   This program is distributed in the hope that it will be useful,       *
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  15  *   GNU General Public License for more details.                          *
  16  *                                                                         *
  17  *   You should have received a copy of the GNU General Public License     *
  18  *   along with this program; if not, write to the                         *
  19  *   Free Software Foundation, Inc.,                                       *
  20  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  21  ***************************************************************************/
  22
  23 #include "kfileitemlistgroupheader.h"
  24
  25 #include <kratingpainter.h>
  26 #include <QPainter>
  27
  28 KFileItemListGroupHeader::KFileItemListGroupHeader(QGraphicsWidget* parent) :
  29     KItemListGroupHeader(parent),
  30     m_dirtyCache(true),
  31     m_text(),
  32     m_pixmap()
  33 {
  34     m_text.setTextFormat(Qt::PlainText);
  35     m_text.setPerformanceHint(QStaticText::AggressiveCaching);
  36 }
  37
  38 KFileItemListGroupHeader::~KFileItemListGroupHeader()
  39 {
  40 }
  41
  42 void KFileItemListGroupHeader::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  43 {
  44     KItemListGroupHeader::paint(painter, option, widget);
  45
  46     if (m_dirtyCache) {
  47         updateCache();
  48     }
  49
  50     if (m_pixmap.isNull()) {
  51         painter->setPen(roleColor());
  52         painter->drawStaticText(roleBounds().topLeft(), m_text);
  53     } else {
  54         painter->drawPixmap(roleBounds().topLeft(), m_pixmap);
  55     }
  56 }
  57
  58 void KFileItemListGroupHeader::roleChanged(const QByteArray &current, const QByteArray &previous)
  59 {
  60     Q_UNUSED(current);
  61     Q_UNUSED(previous);
  62     m_dirtyCache = true;
  63 }
  64
  65 void KFileItemListGroupHeader::dataChanged(const QVariant& current, const QVariant& previous)
  66 {
  67     Q_UNUSED(current);
  68     Q_UNUSED(previous);
  69     m_dirtyCache = true;
  70 }
  71
  72 void KFileItemListGroupHeader::resizeEvent(QGraphicsSceneResizeEvent* event)
  73 {
  74     QGraphicsWidget::resizeEvent(event);
  75     m_dirtyCache = true;
  76 }
  77
  78 void KFileItemListGroupHeader::updateCache()
  79 {
  80     Q_ASSERT(m_dirtyCache);
  81     m_dirtyCache = false;
  82
  83     const qreal maxWidth = size().width() - 4 * styleOption().padding;
  84
  85     if (role() == "rating") {
  86         m_text = QString();
  87
  88         const qreal height = styleOption().fontMetrics.ascent();
  89         const QSizeF pixmapSize(qMin(height * 5, maxWidth), height);
  90
  91         m_pixmap = QPixmap(pixmapSize.toSize());
  92         m_pixmap.fill(Qt::transparent);
  93
  94         QPainter painter(&m_pixmap);
  95         const QRect rect(0, 0, m_pixmap.width(), m_pixmap.height());
  96         const int rating = data().toInt();
  97         KRatingPainter::paintRating(&painter, rect, Qt::AlignJustify | Qt::AlignVCenter, rating);
  98     } else {
  99         m_pixmap = QPixmap();
 100
 101         QFontMetricsF fontMetrics(font());
 102         const QString text = fontMetrics.elidedText(data().toString(), Qt::ElideRight, maxWidth);
 103         m_text.setText(text);
 104     }
 105 }
 106
 107 #include "kfileitemlistgroupheader.moc"