qt5base-lts/examples/graphicsview/basicgraphicslayouts/layoutitem.cpp

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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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****************************************************************************/
#include "layoutitem.h"
//! [0]
LayoutItem::LayoutItem(QGraphicsItem *parent/* = 0*/)
: QGraphicsLayoutItem(), QGraphicsItem(parent)
{
m_pix = new QPixmap(QLatin1String(":/images/block.png"));
setGraphicsItem(this);
}
//! [0]
LayoutItem::~LayoutItem()
{
delete m_pix;
}
//! [1]
void LayoutItem::paint(QPainter *painter,
const QStyleOptionGraphicsItem *option, QWidget *widget /*= 0*/)
{
Q_UNUSED(widget);
Q_UNUSED(option);
QRectF frame(QPointF(0,0), geometry().size());
qreal w = m_pix->width();
qreal h = m_pix->height();
QGradientStops stops;
//! [1]
//! [2]
// paint a background rect (with gradient)
QLinearGradient gradient(frame.topLeft(), frame.topLeft() + QPointF(200,200));
stops << QGradientStop(0.0, QColor(60, 60, 60));
stops << QGradientStop(frame.height()/2/frame.height(), QColor(102, 176, 54));
//stops << QGradientStop(((frame.height() + h)/2 )/frame.height(), QColor(157, 195, 55));
stops << QGradientStop(1.0, QColor(215, 215, 215));
gradient.setStops(stops);
painter->setBrush(QBrush(gradient));
painter->drawRoundedRect(frame, 10.0, 10.0);
// paint a rect around the pixmap (with gradient)
QPointF pixpos = frame.center() - (QPointF(w, h)/2);
QRectF innerFrame(pixpos, QSizeF(w, h));
innerFrame.adjust(-4, -4, +4, +4);
gradient.setStart(innerFrame.topLeft());
gradient.setFinalStop(innerFrame.bottomRight());
stops.clear();
stops << QGradientStop(0.0, QColor(215, 255, 200));
stops << QGradientStop(0.5, QColor(102, 176, 54));
stops << QGradientStop(1.0, QColor(0, 0, 0));
gradient.setStops(stops);
painter->setBrush(QBrush(gradient));
painter->drawRoundedRect(innerFrame, 10.0, 10.0);
painter->drawPixmap(pixpos, *m_pix);
}
//! [2]
//! [3]
QRectF LayoutItem::boundingRect() const
{
return QRectF(QPointF(0,0), geometry().size());
}
//! [3]
//! [4]
void LayoutItem::setGeometry(const QRectF &geom)
{
prepareGeometryChange();
QGraphicsLayoutItem::setGeometry(geom);
setPos(geom.topLeft());
}
//! [4]
//! [5]
QSizeF LayoutItem::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
switch (which) {
case Qt::MinimumSize:
case Qt::PreferredSize:
// Do not allow a size smaller than the pixmap with two frames around it.
return m_pix->size() + QSize(12, 12);
case Qt::MaximumSize:
return QSizeF(1000,1000);
default:
break;
}
return constraint;
}
//! [5]