<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Qt 4.6: main.cpp Example File (graphicsview/weatheranchorlayout/main.cpp)</title>
<link href="classic.css" rel="stylesheet" type="text/css" />
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td>
<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">main.cpp Example File<br /><span class="small-subtitle">graphicsview/weatheranchorlayout/main.cpp</span>
</h1>
<pre><span class="comment"> /****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/</span>
#include <QLabel>
#include <QPainter>
#include <QPushButton>
#include <QApplication>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsWidget>
#include <QGraphicsProxyWidget>
#include <QGraphicsAnchorLayout>
#include <QGraphicsSceneResizeEvent>
class PixmapWidget : public QGraphicsLayoutItem
{
public:
PixmapWidget(const QPixmap &pix) : QGraphicsLayoutItem()
{
original = new QGraphicsPixmapItem(pix);
setGraphicsItem(original);
original->show();
r = QRectF(QPointF(0, 0), pix.size());
}
~PixmapWidget()
{
setGraphicsItem(0);
delete original;
}
void setZValue(qreal z)
{
original->setZValue(z);
}
void setGeometry (const QRectF &rect)
{
original->scale(rect.width() / r.width(), rect.height() / r.height());
original->setPos(rect.x(), rect.y());
r = rect;
}
protected:
QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const
{
Q_UNUSED(constraint);
QSizeF sh;
switch (which) {
case Qt::MinimumSize:
sh = QSizeF(0, 0);
break;
case Qt::PreferredSize:
sh = QSizeF(50, 50);
break;
case Qt::MaximumSize:
sh = QSizeF(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
break;
}
return sh;
}
private:
QGraphicsPixmapItem *original;
QRectF r;
};
class PlaceWidget : public QGraphicsWidget
{
Q_OBJECT
public:
PlaceWidget(const QPixmap &pix) : QGraphicsWidget(), original(pix), scaled(pix)
{
}
void paint(QPainter *painter, const QStyleOptionGraphicsItem*, QWidget*)
{
QPointF reflection = QPointF();
reflection.setY(scaled.height() + 2);
painter->drawPixmap(QPointF(), scaled);
QPixmap tmp(scaled.size());
tmp.fill(Qt::transparent);
QPainter p(&tmp);
<span class="comment">// create gradient</span>
QPoint p1(scaled.width() / 2, 0);
QPoint p2(scaled.width() / 2, scaled.height());
QLinearGradient linearGrad(p1, p2);
linearGrad.setColorAt(0, QColor(0, 0, 0, 0));
linearGrad.setColorAt(0.65, QColor(0, 0, 0, 127));
linearGrad.setColorAt(1, QColor(0, 0, 0, 255));
<span class="comment">// apply 'mask'</span>
p.setBrush(linearGrad);
p.fillRect(0, 0, tmp.width(), tmp.height(), QBrush(linearGrad));
p.fillRect(0, 0, tmp.width(), tmp.height(), QBrush(linearGrad));
<span class="comment">// paint the image flipped</span>
p.setCompositionMode(QPainter::CompositionMode_DestinationOver);
p.drawPixmap(0, 0, QPixmap::fromImage(scaled.toImage().mirrored(false, true)));
p.end();
painter->drawPixmap(reflection, tmp);
}
void resizeEvent(QGraphicsSceneResizeEvent *event)
{
QSize newSize = event->newSize().toSize();
newSize.setHeight(newSize.height() / 2);
scaled = original.scaled(newSize);
}
QRectF boundingRect() const
{
QSize size(scaled.width(), scaled.height() * 2 + 2);
return QRectF(QPointF(0, 0), size);
}
private:
QPixmap original;
QPixmap scaled;
};
static QGraphicsProxyWidget *createItem(const QString &name = "Unnamed")
{
QGraphicsProxyWidget *w = new QGraphicsProxyWidget;
w->setWidget(new QPushButton(name));
w->setData(0, name);
w->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
return w;
}
int main(int argc, char **argv)
{
Q_INIT_RESOURCE(weatheranchorlayout);
QApplication app(argc, argv);
QGraphicsScene scene;
scene.setSceneRect(0, 0, 800, 480);
<span class="comment">// pixmaps widgets</span>
PixmapWidget *title = new PixmapWidget(QPixmap(":/images/title.jpg"));
PlaceWidget *place = new PlaceWidget(QPixmap(":/images/place.jpg"));
PixmapWidget *details = new PixmapWidget(QPixmap(":/images/5days.jpg"));
PixmapWidget *sunnyWeather = new PixmapWidget(QPixmap(":/images/weather-few-clouds.png"));
PixmapWidget *tabbar = new PixmapWidget(QPixmap(":/images/tabbar.jpg"));
<span class="comment">// setup sizes</span>
title->setPreferredSize(QSizeF(348, 45));
title->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
place->setPreferredSize(QSizeF(96, 72));
place->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
details->setMinimumSize(QSizeF(200, 112));
details->setPreferredSize(QSizeF(200, 112));
details->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
tabbar->setPreferredSize(QSizeF(70, 24));
tabbar->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
sunnyWeather->setPreferredSize(QSizeF(128, 97));
sunnyWeather->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
sunnyWeather->setZValue(9999);
<span class="comment">// start anchor layout</span>
QGraphicsAnchorLayout *l = new QGraphicsAnchorLayout;
l->setSpacing(0);
<span class="comment">// setup the main widget</span>
QGraphicsWidget *w = new QGraphicsWidget(0, Qt::Window);
QPalette p;
p.setColor(QPalette::Window, Qt::black);
w->setPalette(p);
w->setPos(20, 20);
w->setLayout(l);
<span class="comment">// vertical anchors</span>
QGraphicsAnchor *anchor = l->addAnchor(title, Qt::AnchorTop, l, Qt::AnchorTop);
anchor = l->addAnchor(place, Qt::AnchorTop, title, Qt::AnchorBottom);
anchor->setSpacing(12);
anchor = l->addAnchor(place, Qt::AnchorBottom, l, Qt::AnchorBottom);
anchor->setSpacing(12);
anchor = l->addAnchor(sunnyWeather, Qt::AnchorTop, title, Qt::AnchorTop);
anchor = l->addAnchor(sunnyWeather, Qt::AnchorBottom, l, Qt::AnchorVerticalCenter);
anchor = l->addAnchor(tabbar, Qt::AnchorTop, title, Qt::AnchorBottom);
anchor->setSpacing(5);
anchor = l->addAnchor(details, Qt::AnchorTop, tabbar, Qt::AnchorBottom);
anchor->setSpacing(2);
anchor = l->addAnchor(details, Qt::AnchorBottom, l, Qt::AnchorBottom);
anchor->setSpacing(12);
<span class="comment">// horizontal anchors</span>
anchor = l->addAnchor(l, Qt::AnchorLeft, title, Qt::AnchorLeft);
anchor = l->addAnchor(title, Qt::AnchorRight, l, Qt::AnchorRight);
anchor = l->addAnchor(place, Qt::AnchorLeft, l, Qt::AnchorLeft);
anchor->setSpacing(15);
anchor = l->addAnchor(place, Qt::AnchorRight, details, Qt::AnchorLeft);
anchor->setSpacing(35);
anchor = l->addAnchor(sunnyWeather, Qt::AnchorLeft, place, Qt::AnchorHorizontalCenter);
anchor = l->addAnchor(sunnyWeather, Qt::AnchorRight, l, Qt::AnchorHorizontalCenter);
anchor = l->addAnchor(tabbar, Qt::AnchorHorizontalCenter, details, Qt::AnchorHorizontalCenter);
anchor = l->addAnchor(details, Qt::AnchorRight, l, Qt::AnchorRight);
<span class="comment">// QGV setup</span>
scene.addItem(w);
scene.setBackgroundBrush(Qt::white);
QGraphicsView *view = new QGraphicsView(&scene);
view->show();
return app.exec();
}
#include "main.moc"</pre>
<p /><address><hr /><div align="center">
<table width="100%" cellspacing="0" border="0"><tr class="address">
<td width="40%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td>
<td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td>
<td width="40%" align="right"><div align="right">Qt 4.6.3</div></td>
</tr></table></div></address></body>
</html>
distrib
>
Mandriva
>
current
>
i586
>
media
>
main-updates
>
by-pkgid
>
8e6051afcdb111a0317a58fb64c2abf5
>
files
>
948
