src/kitemviews/kstandarditemlistgroupheader.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  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program; if not, write to the                         *
  18  *   Free Software Foundation, Inc.,                                       *
  19  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  20  ***************************************************************************/
  21
  22 #include "kstandarditemlistgroupheader.h"
  23
  24 #include <KRatingPainter>
  25 #include <QPainter>
  26
  27 KStandardItemListGroupHeader::KStandardItemListGroupHeader(QGraphicsWidget* parent) :
  28     KItemListGroupHeader(parent),
  29     m_dirtyCache(true),
  30     m_text(),
  31     m_pixmap()
  32 {
  33     m_text.setTextFormat(Qt::PlainText);
  34     m_text.setPerformanceHint(QStaticText::AggressiveCaching);
  35 }
  36
  37 KStandardItemListGroupHeader::~KStandardItemListGroupHeader()
  38 {
  39 }
  40
  41 void KStandardItemListGroupHeader::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  42 {
  43     if (m_dirtyCache) {
  44         updateCache();
  45     }
  46     KItemListGroupHeader::paint(painter, option, widget);
  47 }
  48
  49 void KStandardItemListGroupHeader::paintRole(QPainter* painter, const QRectF& roleBounds, const QColor& color)
  50 {
  51     if (m_pixmap.isNull()) {
  52         painter->setPen(color);
  53         painter->drawStaticText(roleBounds.topLeft(), m_text);
  54     } else {
  55         painter->drawPixmap(roleBounds.topLeft(), m_pixmap);
  56     }
  57 }
  58
  59 void KStandardItemListGroupHeader::paintSeparator(QPainter* painter, const QColor& color)
  60 {
  61     if (itemIndex() == 0) {
  62         // No top- or left-line should be drawn for the first group-header
  63         return;
  64     }
  65
  66     painter->setPen(color);
  67
  68     if (scrollOrientation() == Qt::Horizontal) {
  69         painter->drawLine(0, 0, 0, size().height() - 1);
  70     } else {
  71         painter->drawLine(0, 0, size().width() - 1, 0);
  72     }
  73 }
  74
  75 void KStandardItemListGroupHeader::roleChanged(const QByteArray &current, const QByteArray &previous)
  76 {
  77     Q_UNUSED(current)
  78     Q_UNUSED(previous)
  79     m_dirtyCache = true;
  80 }
  81
  82 void KStandardItemListGroupHeader::dataChanged(const QVariant& current, const QVariant& previous)
  83 {
  84     Q_UNUSED(current)
  85     Q_UNUSED(previous)
  86     m_dirtyCache = true;
  87 }
  88
  89 void KStandardItemListGroupHeader::resizeEvent(QGraphicsSceneResizeEvent* event)
  90 {
  91     QGraphicsWidget::resizeEvent(event);
  92     m_dirtyCache = true;
  93 }
  94
  95 void KStandardItemListGroupHeader::updateCache()
  96 {
  97     Q_ASSERT(m_dirtyCache);
  98     m_dirtyCache = false;
  99
 100     const qreal maxWidth = size().width() - 4 * styleOption().padding;
 101
 102     if (role() == "rating") {
 103         m_text.setText(QString());
 104
 105         const qreal height = styleOption().fontMetrics.ascent();
 106         const QSizeF pixmapSize(qMin(height * 5, maxWidth), height);
 107
 108         m_pixmap = QPixmap(pixmapSize.toSize());
 109         m_pixmap.fill(Qt::transparent);
 110
 111         QPainter painter(&m_pixmap);
 112         const QRect rect(0, 0, m_pixmap.width(), m_pixmap.height());
 113         const int rating = data().toInt();
 114         KRatingPainter::paintRating(&painter, rect, Qt::AlignJustify | Qt::AlignVCenter, rating);
 115     } else {
 116         m_pixmap = QPixmap();
 117
 118         QFontMetricsF fontMetrics(font());
 119         const QString text = fontMetrics.elidedText(data().toString(), Qt::ElideRight, maxWidth);
 120         m_text.setText(text);
 121     }
 122 }
 123