src/kitemviews/kstandarditemlistgroupheader.cpp

   1 /*
   2  * SPDX-FileCopyrightText: 2011 Peter Penz <peter.penz19@gmail.com>
   3  *
   4  * Based on the Itemviews NG project from Trolltech Labs
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-or-later
   7  */
   8
   9 #include "kstandarditemlistgroupheader.h"
  10
  11 #include <KRatingPainter>
  12 #include <QPainter>
  13
  14 KStandardItemListGroupHeader::KStandardItemListGroupHeader(QGraphicsWidget *parent)
  15     : KItemListGroupHeader(parent)
  16     , m_dirtyCache(true)
  17     , m_text()
  18     , m_pixmap()
  19 {
  20 }
  21
  22 KStandardItemListGroupHeader::~KStandardItemListGroupHeader()
  23 {
  24 }
  25
  26 void KStandardItemListGroupHeader::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
  27 {
  28     if (m_dirtyCache) {
  29         updateCache();
  30     }
  31     KItemListGroupHeader::paint(painter, option, widget);
  32 }
  33
  34 void KStandardItemListGroupHeader::paintRole(QPainter *painter, const QRectF &roleBounds, const QColor &color)
  35 {
  36     if (m_pixmap.isNull()) {
  37         painter->setPen(color);
  38         painter->drawText(roleBounds, 0, m_text);
  39     } else {
  40         painter->drawPixmap(roleBounds.topLeft(), m_pixmap);
  41     }
  42 }
  43
  44 void KStandardItemListGroupHeader::paintSeparator(QPainter *painter, const QColor &color)
  45 {
  46     if (itemIndex() == 0) {
  47         // No top- or left-line should be drawn for the first group-header
  48         return;
  49     }
  50
  51     painter->setPen(color);
  52
  53     if (scrollOrientation() == Qt::Horizontal) {
  54         const qreal x = layoutDirection() == Qt::RightToLeft ? size().width() - 1 : 0;
  55         painter->drawLine(x, 0, x, size().height() - 1);
  56     } else {
  57         if (layoutDirection() == Qt::LeftToRight) {
  58             painter->drawLine(0, 0, size().width() - 1, 0);
  59         } else {
  60             painter->drawLine(1, 0, size().width(), 0);
  61         }
  62     }
  63 }
  64
  65 void KStandardItemListGroupHeader::roleChanged(const QByteArray &current, const QByteArray &previous)
  66 {
  67     Q_UNUSED(current)
  68     Q_UNUSED(previous)
  69     m_dirtyCache = true;
  70 }
  71
  72 void KStandardItemListGroupHeader::dataChanged(const QVariant &current, const QVariant &previous)
  73 {
  74     Q_UNUSED(current)
  75     Q_UNUSED(previous)
  76     m_dirtyCache = true;
  77 }
  78
  79 void KStandardItemListGroupHeader::resizeEvent(QGraphicsSceneResizeEvent *event)
  80 {
  81     KItemListGroupHeader::resizeEvent(event);
  82     m_dirtyCache = true;
  83 }
  84
  85 void KStandardItemListGroupHeader::updateCache()
  86 {
  87     Q_ASSERT(m_dirtyCache);
  88     m_dirtyCache = false;
  89
  90     const qreal maxWidth = size().width() - 4 * styleOption().padding;
  91
  92     if (role() == "rating") {
  93         m_text = QString();
  94
  95         const qreal height = styleOption().fontMetrics.ascent();
  96         const QSizeF pixmapSize(qMin(height * 5, maxWidth), height);
  97
  98         m_pixmap = QPixmap(pixmapSize.toSize());
  99         m_pixmap.fill(Qt::transparent);
 100
 101         QPainter painter(&m_pixmap);
 102         const QRect rect(0, 0, m_pixmap.width(), m_pixmap.height());
 103         const int rating = data().toInt();
 104         KRatingPainter::paintRating(&painter, rect, Qt::AlignJustify | Qt::AlignVCenter, rating);
 105     } else {
 106         m_pixmap = QPixmap();
 107
 108         QFontMetricsF fontMetrics(font());
 109         const QString text = fontMetrics.elidedText(data().toString(), Qt::ElideRight, maxWidth);
 110         m_text = text;
 111     }
 112 }
 113
 114 #include "moc_kstandarditemlistgroupheader.cpp"