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
  23 KStandardItemListGroupHeader::~KStandardItemListGroupHeader()
  24 {
  25 }
  26
  27 void KStandardItemListGroupHeader::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  28 {
  29     if (m_dirtyCache) {
  30         updateCache();
  31     }
  32     KItemListGroupHeader::paint(painter, option, widget);
  33 }
  34
  35 void KStandardItemListGroupHeader::paintRole(QPainter* painter, const QRectF& roleBounds, const QColor& color)
  36 {
  37     if (m_pixmap.isNull()) {
  38         painter->setPen(color);
  39         painter->drawText(roleBounds, 0, m_text);
  40     } else {
  41         painter->drawPixmap(roleBounds.topLeft(), m_pixmap);
  42     }
  43 }
  44
  45 void KStandardItemListGroupHeader::paintSeparator(QPainter* painter, const QColor& color)
  46 {
  47     if (itemIndex() == 0) {
  48         // No top- or left-line should be drawn for the first group-header
  49         return;
  50     }
  51
  52     painter->setPen(color);
  53
  54     if (scrollOrientation() == Qt::Horizontal) {
  55         painter->drawLine(0, 0, 0, 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