plasma-framework/shadowitem.cpp

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/*
* Copyright 2007 by Zack Rusin <zack@kde.org>
*
* This program 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, or
* (at your option) any later version.
*
* This program 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 General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "shadowitem_p.h"
#include "effects/blur.cpp"
#include <QPainter>
#include <QImage>
#include <QDebug>
ShadowItem::ShadowItem(QGraphicsItem *item)
{
setZValue(20);
m_shadowParent = 0;
m_offset = QPointF(12, 12);
setShadowParent(item);
}
void ShadowItem::setShadowParent(QGraphicsItem *item)
{
m_shadowParent = item;
adjustPosition();
generate();
}
QGraphicsItem * ShadowItem::shadowParent() const
{
return m_shadowParent;
}
QSize ShadowItem::shadowedSize() const
{
QSize s = boundingRect().size().toSize();
return s - QSize(32, 32);
}
void ShadowItem::generate()
{
if (!m_shadowParent) {
return;
}
QPainterPath path = m_shadowParent->shape();
QRectF rect = path.boundingRect();
QSize s = rect.size().toSize() + QSize(30, 30);
QImage img(s, QImage::Format_ARGB32_Premultiplied);
img.fill(0);
QPainter p(&img);
p.translate(15, 15);
p.setRenderHint(QPainter::Antialiasing);
p.setCompositionMode(QPainter::CompositionMode_Source);
p.fillPath(path, Qt::gray);
p.end();
#ifdef DO_GLOW
QImage blurred = img;
expblur<16, 7>(img, 7);
p.begin(&img);
p.setCompositionMode(QPainter::CompositionMode_Plus);
p.drawImage(0, 0, blurred);
p.end();
#else
expblur<16, 7>(img, 7);
#endif
setPixmap(QPixmap::fromImage(img));
}
void ShadowItem::adjustPosition()
{
if (!m_shadowParent) {
return;
}
setPos(m_shadowParent->pos() - m_offset);
}
void ShadowItem::setOffset(const QPointF &offset)
{
m_offset = offset;
}
QPointF ShadowItem::offset() const
{
return m_offset;
}