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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QGraphicsItem>
#include <QPainter>
#include <QDebug>
#include "listitemcache.h"
ListItemCache::ListItemCache()
{
}
ListItemCache::~ListItemCache()
{
QPixmapCache::remove(m_cacheKey);
}
void ListItemCache::draw(QPainter * painter)
{
QRectF irect = sourceBoundingRect(Qt::LogicalCoordinates);
QRectF vrect = painter->clipPath().boundingRect();
if (vrect.intersects(irect)) {
QRectF newVisibleRect = irect.intersected(vrect);
QPixmap pixmap;
if (!QPixmapCache::find(m_cacheKey, &pixmap) ||
m_visibleRect.toRect() != newVisibleRect.toRect()) {
//qDebug() << "ListItemCache: caching" << m_visibleRect
// << "->" << newVisibleRect;
pixmap = QPixmap(sourceBoundingRect().toRect().size());
pixmap.fill(Qt::transparent);
QPainter pixmapPainter(&pixmap);
drawSource(&pixmapPainter);
pixmapPainter.end();
m_cacheKey = QPixmapCache::insert(pixmap);
m_visibleRect = newVisibleRect;
}
//qDebug() << "ListItemCache: blitting" << m_visibleRect;
painter->drawPixmap(0, 0, pixmap);
}
}
void ListItemCache::sourceChanged(ChangeFlags)
{
QPixmapCache::remove(m_cacheKey);
}
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