Create a reusable item delegate wich supports "annotations".

Currently used by the QML outline and C++ type hierarchy.

Reviewed-by: kkoehne
Task-number: QTCREATORBUG-2583

src/libs/utils/annotateditemdelegate.cpp

@@ -0,0 +1,115 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+**
+**************************************************************************/
+
+#include "annotateditemdelegate.h"
+
+#include <QtCore/QSize>
+#include <QtCore/QModelIndex>
+#include <QtGui/QStandardItemModel>
+#include <QtGui/QPainter>
+#include <QtGui/QStyle>
+#include <QtGui/QStyleOptionViewItemV4>
+#include <QtGui/QApplication>
+
+using namespace Utils;
+
+AnnotatedItemDelegate::AnnotatedItemDelegate(QObject *parent) : QStyledItemDelegate(parent)
+{}
+
+AnnotatedItemDelegate::~AnnotatedItemDelegate()
+{}
+
+void AnnotatedItemDelegate::setAnnotationRole(int role)
+{
+    m_annotationRole = role;
+}
+
+int AnnotatedItemDelegate::annotationRole() const
+{
+    return m_annotationRole;
+}
+
+void AnnotatedItemDelegate::setDelimiter(const QString &delimiter)
+{
+    m_delimiter = delimiter;
+}
+
+const QString &AnnotatedItemDelegate::delimiter() const
+{
+    return m_delimiter;
+}
+
+void AnnotatedItemDelegate::paint(QPainter *painter,
+                                  const QStyleOptionViewItem &option,
+                                  const QModelIndex &index) const
+{
+    QStyleOptionViewItemV4 opt = option;
+    initStyleOption(&opt, index);
+
+    QStyle *style = QApplication::style();
+    style->drawPrimitive(QStyle::PE_PanelItemViewItem, &opt, painter, opt.widget);
+    style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, opt.widget);
+
+    const QString &annotation = index.data(m_annotationRole).toString();
+    if (!annotation.isEmpty()) {
+        QPalette disabled(opt.palette);
+        disabled.setCurrentColorGroup(QPalette::Disabled);
+
+        painter->save();
+        painter->setPen(disabled.color(QPalette::WindowText));
+
+        static int extra = opt.fontMetrics.width(m_delimiter) + 10;
+        const QPixmap &pixmap = opt.icon.pixmap(opt.decorationSize);
+        const QRect &iconRect = style->itemPixmapRect(opt.rect, opt.decorationAlignment, pixmap);
+        const QRect &displayRect = style->itemTextRect(opt.fontMetrics, opt.rect,
+            opt.displayAlignment, true, index.data(Qt::DisplayRole).toString());
+        QRect annotationRect = style->itemTextRect(opt.fontMetrics, opt.rect,
+            opt.displayAlignment, true, annotation);
+        annotationRect.adjust(iconRect.width() + displayRect.width() + extra, 0,
+                              iconRect.width() + displayRect.width() + extra, 0);
+
+        QApplication::style()->drawItemText(painter, annotationRect,
+            Qt::AlignLeft | Qt::AlignBottom, disabled, true, annotation);
+
+        painter->restore();
+    }
+}
+
+QSize AnnotatedItemDelegate::sizeHint(const QStyleOptionViewItem &option,
+                                      const QModelIndex &index) const
+{
+    QStyleOptionViewItemV4 opt = option;
+    initStyleOption(&opt, index);
+
+    const QString &annotation = index.data(m_annotationRole).toString();
+    if (!annotation.isEmpty())
+        opt.text += m_delimiter + annotation;
+
+    return QApplication::style()->sizeFromContents(QStyle::CT_ItemViewItem, &opt, QSize(), 0);
+}