Qt 5.6 | Qt SQL | Drill Down Example | imageitem.cpp Example File

Qt 5.6.2 Reference Documentation

# imageitem.cpp Example File

drilldown/imageitem.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** 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 The Qt Company Ltd 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,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #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, SIGNAL(frameChanged(int)), this, SLOT(setFrame(int)));
          connect(&timeLine, SIGNAL(finished()), this, SLOT(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()
      {
          return recordId;
      }

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