Qt 5.9 | Qt SQL | Drill Down Example | imageitem.cpp Example File

Qt 5.9.9 Reference Documentation

# imageitem.cpp Example File

drilldown/imageitem.cpp

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      #include "imageitem.h"

      ImageItem::ImageItem(int id, const QPixmap &pixmap, QGraphicsItem *parent)
          : QGraphicsPixmapItem(pixmap, parent)
      {
          recordId = id;
          setAcceptHoverEvents(true);

          timeLine.setDuration(150);
          timeLine.setFrameRange(0, 150);

          connect(&timeLine, &QTimeLine::frameChanged, this, &ImageItem::setFrame);
          connect(&timeLine, &QTimeLine::finished, this, &ImageItem::updateItemPosition);

          adjust();
      }

      void ImageItem::hoverEnterEvent(QGraphicsSceneHoverEvent * /*event*/)
      {
          timeLine.setDirection(QTimeLine::Forward);

          if (z != 1.0) {
              z = 1.0;
              updateItemPosition();
          }

          if (timeLine.state() == QTimeLine::NotRunning)
              timeLine.start();
      }

      void ImageItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * /*event*/)
      {
          timeLine.setDirection(QTimeLine::Backward);
          if (z != 0.0)
              z = 0.0;

          if (timeLine.state() == QTimeLine::NotRunning)
              timeLine.start();
      }

      void ImageItem::setFrame(int frame)
      {
          adjust();
          QPointF center = boundingRect().center();

          setTransform(QTransform::fromTranslate(center.x(), center.y()), true);
          setTransform(QTransform::fromScale(1 + frame / 330.0, 1 + frame / 330.0), true);
          setTransform(QTransform::fromTranslate(-center.x(), -center.y()), true);
      }

      void ImageItem::adjust()
      {
          QMatrix matrix;
          matrix.scale(120/ boundingRect().width(), 120/ boundingRect().height());
          setMatrix(matrix);
      }

      int ImageItem::id() const
      {
          return recordId;
      }

      void ImageItem::updateItemPosition()
      {
          setZValue(z);
      }