main.cpp Example File

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  #include <QApplication>
  #include <QLabel>
  #include <QPainter>
  #include <QPushButton>

  #include <QGraphicsAnchorLayout>
  #include <QGraphicsProxyWidget>
  #include <QGraphicsScene>
  #include <QGraphicsSceneResizeEvent>
  #include <QGraphicsView>
  #include <QGraphicsWidget>

  class GraphicsView : public QGraphicsView
  {
  public:
      GraphicsView(QGraphicsScene *scene, QGraphicsWidget *widget)
          : QGraphicsView(scene), w(widget)
      {
      }

      virtual void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE
      {
          w->setGeometry(0, 0, event->size().width(), event->size().height());
      }

      QGraphicsWidget *w;
  };

  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) Q_DECL_OVERRIDE
      {
          original->setTransform(QTransform::fromScale(rect.width() / r.width(),
                                                       rect.height() / r.height()), true);
          original->setPos(rect.x(), rect.y());
          r = rect;
      }

  protected:
      QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const Q_DECL_OVERRIDE
      {
          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*) Q_DECL_OVERRIDE
      {
          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) Q_DECL_OVERRIDE
      {
          QSize newSize = event->newSize().toSize();
          newSize.setHeight(newSize.height() / 2);
          scaled = original.scaled(newSize);
      }

      QRectF boundingRect() const Q_DECL_OVERRIDE
      {
          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 *layout = new QGraphicsAnchorLayout;
      layout->setSpacing(0);

      // setup the main widget
      QGraphicsWidget *widget = new QGraphicsWidget(0, Qt::Window);
      QPalette p;
      p.setColor(QPalette::Window, Qt::black);
      widget->setPalette(p);
      widget->setPos(20, 20);
      widget->setLayout(layout);

      // vertical anchors
      QGraphicsAnchor *anchor = layout->addAnchor(title, Qt::AnchorTop, layout, Qt::AnchorTop);
      anchor = layout->addAnchor(place, Qt::AnchorTop, title, Qt::AnchorBottom);
      anchor->setSpacing(12);
      anchor = layout->addAnchor(place, Qt::AnchorBottom, layout, Qt::AnchorBottom);
      anchor->setSpacing(12);

      anchor = layout->addAnchor(sunnyWeather, Qt::AnchorTop, title, Qt::AnchorTop);
      anchor = layout->addAnchor(sunnyWeather, Qt::AnchorBottom, layout, Qt::AnchorVerticalCenter);

      anchor = layout->addAnchor(tabbar, Qt::AnchorTop, title, Qt::AnchorBottom);
      anchor->setSpacing(5);
      anchor = layout->addAnchor(details, Qt::AnchorTop, tabbar, Qt::AnchorBottom);
      anchor->setSpacing(2);
      anchor = layout->addAnchor(details, Qt::AnchorBottom, layout, Qt::AnchorBottom);
      anchor->setSpacing(12);

      // horizontal anchors
      anchor = layout->addAnchor(layout, Qt::AnchorLeft, title, Qt::AnchorLeft);
      anchor = layout->addAnchor(title, Qt::AnchorRight, layout, Qt::AnchorRight);

      anchor = layout->addAnchor(place, Qt::AnchorLeft, layout, Qt::AnchorLeft);
      anchor->setSpacing(15);
      anchor = layout->addAnchor(place, Qt::AnchorRight, details, Qt::AnchorLeft);
      anchor->setSpacing(35);

      anchor = layout->addAnchor(sunnyWeather, Qt::AnchorLeft, place, Qt::AnchorHorizontalCenter);
      anchor = layout->addAnchor(sunnyWeather, Qt::AnchorRight, layout, Qt::AnchorHorizontalCenter);

      anchor = layout->addAnchor(tabbar, Qt::AnchorHorizontalCenter, details, Qt::AnchorHorizontalCenter);
      anchor = layout->addAnchor(details, Qt::AnchorRight, layout, Qt::AnchorRight);

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

      return app.exec();
  }

  #include "main.moc"