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  *   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 "kstandarditemlistgroupheader.h"
  24
  25 #include <KRatingPainter>
  26 #include <QPainter>
  27
  28 KStandardItemListGroupHeader::KStandardItemListGroupHeader(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 KStandardItemListGroupHeader::~KStandardItemListGroupHeader()
  39 {
  40 }
  41
  42 void KStandardItemListGroupHeader::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  43 {
  44     if (m_dirtyCache) {
  45         updateCache();
  46     }
  47     KItemListGroupHeader::paint(painter, option, widget);
  48 }
  49
  50 void KStandardItemListGroupHeader::paintRole(QPainter* painter, const QRectF& roleBounds, const QColor& color)
  51 {
  52     if (m_pixmap.isNull()) {
  53         painter->setPen(color);
  54         painter->drawStaticText(roleBounds.topLeft(), m_text);
  55     } else {
  56         painter->drawPixmap(roleBounds.topLeft(), m_pixmap);
  57     }
  58 }
  59
  60 void KStandardItemListGroupHeader::paintSeparator(QPainter* painter, const QColor& color)
  61 {
  62     if (itemIndex() == 0) {
  63         // No top- or left-line should be drawn for the first group-header
  64         return;
  65     }
  66
  67     painter->setPen(color);
  68
  69     if (scrollOrientation() == Qt::Horizontal) {
  70         painter->drawLine(0, 0, 0, size().height() - 1);
  71     } else {
  72         painter->drawLine(0, 0, size().width() - 1, 0);
  73     }
  74 }
  75
  76 void KStandardItemListGroupHeader::roleChanged(const QByteArray &current, const QByteArray &previous)
  77 {
  78     Q_UNUSED(current);
  79     Q_UNUSED(previous);
  80     m_dirtyCache = true;
  81 }
  82
  83 void KStandardItemListGroupHeader::dataChanged(const QVariant& current, const QVariant& previous)
  84 {
  85     Q_UNUSED(current);
  86     Q_UNUSED(previous);
  87     m_dirtyCache = true;
  88 }
  89
  90 void KStandardItemListGroupHeader::resizeEvent(QGraphicsSceneResizeEvent* event)
  91 {
  92     QGraphicsWidget::resizeEvent(event);
  93     m_dirtyCache = true;
  94 }
  95
  96 void KStandardItemListGroupHeader::updateCache()
  97 {
  98     Q_ASSERT(m_dirtyCache);
  99     m_dirtyCache = false;
 100
 101     const qreal maxWidth = size().width() - 4 * styleOption().padding;
 102
 103     if (role() == "rating") {
 104         m_text = QString(); // krazy:exlude=nullstrassign
 105
 106         const qreal height = styleOption().fontMetrics.ascent();
 107         const QSizeF pixmapSize(qMin(height * 5, maxWidth), height);
 108
 109         m_pixmap = QPixmap(pixmapSize.toSize());
 110         m_pixmap.fill(Qt::transparent);
 111
 112         QPainter painter(&m_pixmap);
 113         const QRect rect(0, 0, m_pixmap.width(), m_pixmap.height());
 114         const int rating = data().toInt();
 115         KRatingPainter::paintRating(&painter, rect, Qt::AlignJustify | Qt::AlignVCenter, rating);
 116     } else {
 117         m_pixmap = QPixmap();
 118
 119         QFontMetricsF fontMetrics(font());
 120         const QString text = fontMetrics.elidedText(data().toString(), Qt::ElideRight, maxWidth);
 121         m_text.setText(text);
 122     }
 123 }
 124