Qt Reference Documentation

main.cpp Example File

graphicsview/weatheranchorlayout/main.cpp
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 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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 ** Contact: Nokia Corporation (qt-info@nokia.com)
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 ** This file is part of the examples of the Qt Toolkit.
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 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
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 #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;
             default:
                 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);

         // create gradient
         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));

         // apply 'mask'
         p.setBrush(linearGrad);
         p.fillRect(0, 0, tmp.width(), tmp.height(), QBrush(linearGrad));
         p.fillRect(0, 0, tmp.width(), tmp.height(), QBrush(linearGrad));

         // paint the image flipped
         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;
 };

 int main(int argc, char **argv)
 {
     Q_INIT_RESOURCE(weatheranchorlayout);

     QApplication app(argc, argv);

     QGraphicsScene scene;
     scene.setSceneRect(0, 0, 800, 480);

     // pixmaps widgets
     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"));

     // setup sizes
     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);

     // start anchor layout
     QGraphicsAnchorLayout *l = new QGraphicsAnchorLayout;
     l->setSpacing(0);

     // setup the main widget
     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);

     // vertical anchors
     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);

     // horizontal anchors
     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);

     // QGV setup
     scene.addItem(w);
     scene.setBackgroundBrush(Qt::white);
     QGraphicsView *view = new QGraphicsView(&scene);
     view->show();

     return app.exec();
 }

 #include "main.moc"
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