From 1ea1f351d63dcbeb047d0658f415ac63a6e8091a Mon Sep 17 00:00:00 2001
From: Peter Penz <peter.penz19@gmail.com>
Date: Sat, 7 Apr 2012 20:59:06 +0200
Subject: [PATCH] Use stars for showing the rating in the group headers

---
 src/kitemviews/kfileitemlistgroupheader.cpp | 61 ++++++++++++++++-----
 src/kitemviews/kfileitemlistgroupheader.h   |  7 ++-
 2 files changed, 53 insertions(+), 15 deletions(-)

diff --git a/src/kitemviews/kfileitemlistgroupheader.cpp b/src/kitemviews/kfileitemlistgroupheader.cpp
index dd90a838c..0c940ed28 100644
--- a/src/kitemviews/kfileitemlistgroupheader.cpp
+++ b/src/kitemviews/kfileitemlistgroupheader.cpp
@@ -22,12 +22,14 @@
 
 #include "kfileitemlistgroupheader.h"
 
+#include <kratingpainter.h>
 #include <QPainter>
 
 KFileItemListGroupHeader::KFileItemListGroupHeader(QGraphicsWidget* parent) :
     KItemListGroupHeader(parent),
-    m_font(),
-    m_text()
+    m_dirtyCache(true),
+    m_text(),
+    m_pixmap()
 {
     m_text.setTextFormat(Qt::PlainText);
     m_text.setPerformanceHint(QStaticText::AggressiveCaching);
@@ -41,32 +43,65 @@ void KFileItemListGroupHeader::paint(QPainter* painter, const QStyleOptionGraphi
 {
     KItemListGroupHeader::paint(painter, option, widget);
 
-    painter->setPen(roleColor());
-    painter->setFont(m_font);
-    painter->drawStaticText(roleBounds().topLeft(), m_text);
+    if (m_dirtyCache) {
+        updateCache();
+    }
+
+    if (m_pixmap.isNull()) {
+        painter->setPen(roleColor());
+        painter->drawStaticText(roleBounds().topLeft(), m_text);
+    } else {
+        painter->drawPixmap(roleBounds().topLeft(), m_pixmap);
+    }
+}
+
+void KFileItemListGroupHeader::roleChanged(const QByteArray &current, const QByteArray &previous)
+{
+    Q_UNUSED(current);
+    Q_UNUSED(previous);
+    m_dirtyCache = true;
 }
 
 void KFileItemListGroupHeader::dataChanged(const QVariant& current, const QVariant& previous)
 {
     Q_UNUSED(current);
     Q_UNUSED(previous);
-    updateText();
+    m_dirtyCache = true;
 }
 
 void KFileItemListGroupHeader::resizeEvent(QGraphicsSceneResizeEvent* event)
 {
     QGraphicsWidget::resizeEvent(event);
-    updateText();
+    m_dirtyCache = true;
 }
 
-void KFileItemListGroupHeader::updateText()
+void KFileItemListGroupHeader::updateCache()
 {
-    const qreal width = size().width() - 4 * styleOption().padding;
-    m_font = font(); // TODO: Most probably the font size will be slightly shrinked in future
+    Q_ASSERT(m_dirtyCache);
+    m_dirtyCache = false;
+
+    const qreal maxWidth = size().width() - 4 * styleOption().padding;
+
+    if (role() == "rating") {
+        m_text = QString();
+
+        const qreal height = styleOption().fontMetrics.ascent();
+        const QSizeF pixmapSize(qMin(height * 5, maxWidth), height);
+
+        m_pixmap = QPixmap(pixmapSize.toSize());
+        m_pixmap.fill(Qt::transparent);
+
+        QPainter painter(&m_pixmap);
+        const QRect rect(0, 0, m_pixmap.width(), m_pixmap.height());
+        const int rating = data().toInt();
+        KRatingPainter::paintRating(&painter, rect, Qt::AlignJustify | Qt::AlignVCenter, rating);
+    } else {
+        m_pixmap = QPixmap();
 
-    QFontMetricsF fontMetrics(m_font);
-    const QString text = fontMetrics.elidedText(data().toString(), Qt::ElideRight, width);
-    m_text.setText(text);
+        QFontMetricsF fontMetrics(font());
+        const QString text = fontMetrics.elidedText(data().toString(), Qt::ElideRight, maxWidth);
+        m_text.setText(text);
+    }
 }
 
 #include "kfileitemlistgroupheader.moc"
diff --git a/src/kitemviews/kfileitemlistgroupheader.h b/src/kitemviews/kfileitemlistgroupheader.h
index 52d9a64f1..41a1123ff 100644
--- a/src/kitemviews/kfileitemlistgroupheader.h
+++ b/src/kitemviews/kfileitemlistgroupheader.h
@@ -24,6 +24,7 @@
 
 #include <kitemviews/kitemlistgroupheader.h>
 
+#include <QPixmap>
 #include <QStaticText>
 
 class LIBDOLPHINPRIVATE_EXPORT KFileItemListGroupHeader : public KItemListGroupHeader
@@ -37,15 +38,17 @@ public:
     virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
 
 protected:
+    virtual void roleChanged(const QByteArray &current, const QByteArray &previous);
     virtual void dataChanged(const QVariant& current, const QVariant& previous);
     virtual void resizeEvent(QGraphicsSceneResizeEvent* event);
 
 private:
-    void updateText();
+    void updateCache();
 
 private:
-    QFont m_font;
+    bool m_dirtyCache;
     QStaticText m_text;
+    QPixmap m_pixmap;
 };
 #endif
 
-- 
2.47.3