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     m_text.setTextFormat(Qt::PlainText);
  21     m_text.setPerformanceHint(QStaticText::AggressiveCaching);
  22 }
  23
  24 KStandardItemListGroupHeader::~KStandardItemListGroupHeader()
  25 {
  26 }
  27
  28 void KStandardItemListGroupHeader::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  29 {
  30     if (m_dirtyCache) {
  31         updateCache();
  32     }
  33     KItemListGroupHeader::paint(painter, option, widget);
  34 }
  35
  36 void KStandardItemListGroupHeader::paintRole(QPainter* painter, const QRectF& roleBounds, const QColor& color)
  37 {
  38     if (m_pixmap.isNull()) {
  39         painter->setPen(color);
  40         painter->drawStaticText(roleBounds.topLeft(), m_text);
  41     } else {
  42         painter->drawPixmap(roleBounds.topLeft(), m_pixmap);
  43     }
  44 }
  45
  46 void KStandardItemListGroupHeader::paintSeparator(QPainter* painter, const QColor& color)
  47 {
  48     if (itemIndex() == 0) {
  49         // No top- or left-line should be drawn for the first group-header
  50         return;
  51     }
  52
  53     painter->setPen(color);
  54
  55     if (scrollOrientation() == Qt::Horizontal) {
  56         painter->drawLine(0, 0, 0, size().height() - 1);
  57     } else {
  58         painter->drawLine(0, 0, size().width() - 1, 0);
  59     }
  60 }
  61
  62 void KStandardItemListGroupHeader::roleChanged(const QByteArray &current, const QByteArray &previous)
  63 {
  64     Q_UNUSED(current)
  65     Q_UNUSED(previous)
  66     m_dirtyCache = true;
  67 }
  68
  69 void KStandardItemListGroupHeader::dataChanged(const QVariant& current, const QVariant& previous)
  70 {
  71     Q_UNUSED(current)
  72     Q_UNUSED(previous)
  73     m_dirtyCache = true;
  74 }
  75
  76 void KStandardItemListGroupHeader::resizeEvent(QGraphicsSceneResizeEvent* event)
  77 {
  78     QGraphicsWidget::resizeEvent(event);
  79     m_dirtyCache = true;
  80 }
  81
  82 void KStandardItemListGroupHeader::updateCache()
  83 {
  84     Q_ASSERT(m_dirtyCache);
  85     m_dirtyCache = false;
  86
  87     const qreal maxWidth = size().width() - 4 * styleOption().padding;
  88
  89     if (role() == "rating") {
  90         m_text.setText(QString());
  91
  92         const qreal height = styleOption().fontMetrics.ascent();
  93         const QSizeF pixmapSize(qMin(height * 5, maxWidth), height);
  94
  95         m_pixmap = QPixmap(pixmapSize.toSize());
  96         m_pixmap.fill(Qt::transparent);
  97
  98         QPainter painter(&m_pixmap);
  99         const QRect rect(0, 0, m_pixmap.width(), m_pixmap.height());
 100         const int rating = data().toInt();
 101         KRatingPainter::paintRating(&painter, rect, Qt::AlignJustify | Qt::AlignVCenter, rating);
 102     } else {
 103         m_pixmap = QPixmap();
 104
 105         QFontMetricsF fontMetrics(font());
 106         const QString text = fontMetrics.elidedText(data().toString(), Qt::ElideRight, maxWidth);
 107         m_text.setText(text);
 108     }
 109 }
 110