- Qt 5.5
- Qt SQL
- Drill Down Example
- imageitem.cpp Example File
- Qt 5.5.1 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
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    **   * Redistributions of source code must retain the above copyright
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    **     from this software without specific prior written permission.
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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, 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);
    }