Make KListView capable of drawing categories on our own way. This make things easier

when we are trying to customize it. We can also benefit from KStyle if some day it 
supports category drawing.

KListView keyboard navigation. Tricier than I thought.

Pending renaming to KCategorizedView. Seems a good name.

svn path=/trunk/KDE/kdebase/apps/; revision=684478

1 files changed, 100 insertions, 0 deletions

diff --git a/src/kitemcategorizer.cpp b/src/kitemcategorizer.cpp
new file mode 100644
index 000000000..93969c3a8
--- /dev/null
+++ b/src/kitemcategorizer.cpp
@@ -0,0 +1,100 @@
+/**
+  * This file is part of the KDE project
+  * Copyright (C) 2007 Rafael Fernández López <[email protected]>
+  *
+  * This library is free software; you can redistribute it and/or
+  * modify it under the terms of the GNU Library General Public
+  * License as published by the Free Software Foundation; either
+  * version 2 of the License, or (at your option) any later version.
+  *
+  * This library is distributed in the hope that it will be useful,
+  * but WITHOUT ANY WARRANTY; without even the implied warranty of
+  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  * Library General Public License for more details.
+  *
+  * You should have received a copy of the GNU Library General Public License
+  * along with this library; see the file COPYING.LIB.  If not, write to
+  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+  * Boston, MA 02110-1301, USA.
+  */
+
+#include "kitemcategorizer.h"
+
+#include <QPainter>
+#include <QStyleOption>
+
+KItemCategorizer::KItemCategorizer()
+{
+}
+
+KItemCategorizer::~KItemCategorizer()
+{
+}
+
+void KItemCategorizer::drawCategory(const QModelIndex &index,
+                                    int sortRole,
+                                    const QStyleOption &option,
+                                    QPainter *painter) const
+{
+    const QString category = categoryForItem(index, sortRole);
+
+    QColor color = option.palette.color(QPalette::Text);
+
+    painter->save();
+    painter->setRenderHint(QPainter::Antialiasing);
+
+    QStyleOptionButton opt;
+
+    opt.rect = option.rect;
+    opt.palette = option.palette;
+    opt.direction = option.direction;
+    opt.text = category;
+
+    if (option.state & QStyle::State_MouseOver)
+    {
+        const QPalette::ColorGroup group =
+                                          option.state & QStyle::State_Enabled ?
+                                          QPalette::Normal : QPalette::Disabled;
+
+        QLinearGradient gradient(option.rect.topLeft(),
+                                 option.rect.bottomRight());
+        gradient.setColorAt(0,
+                            option.palette.color(group,
+                                                 QPalette::Highlight).light());
+        gradient.setColorAt(1, Qt::transparent);
+
+        painter->fillRect(option.rect, gradient);
+    }
+
+    QFont painterFont = painter->font();
+    painterFont.setWeight(QFont::Bold);
+    painterFont.setPointSize(painterFont.pointSize() + 2);
+    QFontMetrics metrics(painterFont);
+    painter->setFont(painterFont);
+
+    QPainterPath path;
+    path.addRect(option.rect.left(),
+                 option.rect.bottom() - 2,
+                 option.rect.width(),
+                 2);
+
+    QLinearGradient gradient(option.rect.topLeft(),
+                             option.rect.bottomRight());
+    gradient.setColorAt(0, color);
+    gradient.setColorAt(1, Qt::transparent);
+
+    painter->setBrush(gradient);
+    painter->fillPath(path, gradient);
+
+    painter->setPen(color);
+
+    painter->drawText(option.rect, Qt::AlignVCenter | Qt::AlignLeft,
+    metrics.elidedText(category, Qt::ElideRight, option.rect.width()));
+
+    painter->restore();
+}
+
+int KItemCategorizer::categoryHeight(const QStyleOption &option) const
+{
+    return option.fontMetrics.height() + 6 /* 4 separator; 2 gradient */;
+}