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# sortingbox.cpp Example File
widgets/tooltips/sortingbox.cpp

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        ** This file is part of the documentation of the Qt Toolkit.
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        #include <QtGui>

        #include <stdlib.h>

        #include "sortingbox.h"

        SortingBox::SortingBox()
        {
            setAttribute(Qt::WA_StaticContents);
            setMouseTracking(true);
            setBackgroundRole(QPalette::Base);

            itemInMotion = 0;

            newCircleButton = createToolButton(tr("New Circle"),
                                               QIcon(":/images/circle.png"),
                                               SLOT(createNewCircle()));

            newSquareButton = createToolButton(tr("New Square"),
                                               QIcon(":/images/square.png"),
                                               SLOT(createNewSquare()));

            newTriangleButton = createToolButton(tr("New Triangle"),
                                                 QIcon(":/images/triangle.png"),
                                                 SLOT(createNewTriangle()));

            circlePath.addEllipse(QRect(0, 0, 100, 100));
            squarePath.addRect(QRect(0, 0, 100, 100));

            qreal x = trianglePath.currentPosition().x();
            qreal y = trianglePath.currentPosition().y();
            trianglePath.moveTo(x + 120 / 2, y);
            trianglePath.lineTo(0, 100);
            trianglePath.lineTo(120, 100);
            trianglePath.lineTo(x + 120 / 2, y);

            setWindowTitle(tr("Tooltips"));
            resize(500, 300);

            createShapeItem(circlePath, tr("Circle"), initialItemPosition(circlePath),
                            initialItemColor());
            createShapeItem(squarePath, tr("Square"), initialItemPosition(squarePath),
                            initialItemColor());
            createShapeItem(trianglePath, tr("Triangle"),
                            initialItemPosition(trianglePath), initialItemColor());
        }

        bool SortingBox::event(QEvent *event)
        {
            if (event->type() == QEvent::ToolTip) {
                QHelpEvent *helpEvent = static_cast<QHelpEvent *>(event);
                int index = itemAt(helpEvent->pos());
                if (index != -1)
                    QToolTip::showText(helpEvent->globalPos(), shapeItems[index].toolTip());
            }
            return QWidget::event(event);
        }

        void SortingBox::resizeEvent(QResizeEvent * /* event */)
        {
            int margin = style()->pixelMetric(QStyle::PM_DefaultTopLevelMargin);
            int x = width() - margin;
            int y = height() - margin;

            y = updateButtonGeometry(newCircleButton, x, y);
            y = updateButtonGeometry(newSquareButton, x, y);
            updateButtonGeometry(newTriangleButton, x, y);
        }

        void SortingBox::paintEvent(QPaintEvent * /* event */)
        {
            QPainter painter(this);
            foreach (ShapeItem shapeItem, shapeItems) {
                painter.translate(shapeItem.position());
                painter.setBrush(shapeItem.color());
                painter.drawPath(shapeItem.path());
                painter.translate(-shapeItem.position());
            }
        }

        void SortingBox::mousePressEvent(QMouseEvent *event)
        {
            if (event->button() == Qt::LeftButton) {
                int index = itemAt(event->pos());
                if (index != -1) {
                    itemInMotion = &shapeItems[index];
                    previousPosition = event->pos();
                    shapeItems.move(index, shapeItems.size() - 1);
                    update();
                }
            }
        }

        void SortingBox::mouseMoveEvent(QMouseEvent *event)
        {
            if ((event->buttons() & Qt::LeftButton) && itemInMotion)
                moveItemTo(event->pos());
        }

        void SortingBox::mouseReleaseEvent(QMouseEvent *event)
        {
            if (event->button() == Qt::LeftButton && itemInMotion) {
                moveItemTo(event->pos());
                itemInMotion = 0;
            }
        }

        void SortingBox::createNewCircle()
        {
            createShapeItem(circlePath, tr("Circle"), randomItemPosition(),
                            randomItemColor());
        }

        void SortingBox::createNewSquare()
        {
            createShapeItem(squarePath, tr("Square"), randomItemPosition(),
                            randomItemColor());
        }

        void SortingBox::createNewTriangle()
        {
            createShapeItem(trianglePath, tr("Triangle"), randomItemPosition(),
                            randomItemColor());
        }

        int SortingBox::itemAt(const QPoint &pos)
        {
            for (int i = shapeItems.size() - 1; i >= 0; --i) {
                const ShapeItem &item = shapeItems[i];
                if (item.path().contains(pos - item.position()))
                    return i;
            }
            return -1;
        }

        void SortingBox::moveItemTo(const QPoint &pos)
        {
            QPoint offset = pos - previousPosition;
            itemInMotion->setPosition(itemInMotion->position() + offset);
            previousPosition = pos;
            update();
        }

        int SortingBox::updateButtonGeometry(QToolButton *button, int x, int y)
        {
            QSize size = button->sizeHint();
            button->setGeometry(x - size.rwidth(), y - size.rheight(),
                                size.rwidth(), size.rheight());

            return y - size.rheight()
                   - style()->pixelMetric(QStyle::PM_DefaultLayoutSpacing);
        }

        void SortingBox::createShapeItem(const QPainterPath &path,
                                         const QString &toolTip, const QPoint &pos,
                                         const QColor &color)
        {
            ShapeItem shapeItem;
            shapeItem.setPath(path);
            shapeItem.setToolTip(toolTip);
            shapeItem.setPosition(pos);
            shapeItem.setColor(color);
            shapeItems.append(shapeItem);
            update();
        }

        QToolButton *SortingBox::createToolButton(const QString &toolTip,
                                                  const QIcon &icon, const char *member)
        {
            QToolButton *button = new QToolButton(this);
            button->setToolTip(toolTip);
            button->setIcon(icon);
            button->setIconSize(QSize(32, 32));
            connect(button, SIGNAL(clicked()), this, member);

            return button;
        }

        QPoint SortingBox::initialItemPosition(const QPainterPath &path)
        {
            int x;
            int y = (height() - (int)path.controlPointRect().height()) / 2;
            if (shapeItems.size() == 0)
                x = ((3 * width()) / 2 - (int)path.controlPointRect().width()) / 2;
            else
                x = (width() / shapeItems.size()
                     - (int)path.controlPointRect().width()) / 2;

            return QPoint(x, y);
        }

        QPoint SortingBox::randomItemPosition()
        {
            return QPoint(rand() % (width() - 120), rand() % (height() - 120));
        }

        QColor SortingBox::initialItemColor()
        {
            return QColor::fromHsv(((shapeItems.size() + 1) * 85) % 256, 255, 190);
        }

        QColor SortingBox::randomItemColor()
        {
            return QColor::fromHsv(rand() % 256, 255, 190);
        }