qt5base-lts/examples/sql/books/bookdelegate.cpp

/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "bookdelegate.h"

#include <QtWidgets>

BookDelegate::BookDelegate(QObject *parent)
    : QSqlRelationalDelegate(parent), star(QPixmap(":images/star.png"))
{
}

void BookDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const
{
    if (index.column() != 5) {
        QStyleOptionViewItemV3 opt = option;
        opt.rect.adjust(0, 0, -1, -1); // since we draw the grid ourselves
        QSqlRelationalDelegate::paint(painter, opt, index);
    } else {
        const QAbstractItemModel *model = index.model();
        QPalette::ColorGroup cg = (option.state & QStyle::State_Enabled) ?
            (option.state & QStyle::State_Active) ? QPalette::Normal : QPalette::Inactive : QPalette::Disabled;

        if (option.state & QStyle::State_Selected)
            painter->fillRect(option.rect, option.palette.color(cg, QPalette::Highlight));

        int rating = model->data(index, Qt::DisplayRole).toInt();
        int width = star.width();
        int height = star.height();
        int x = option.rect.x();
        int y = option.rect.y() + (option.rect.height() / 2) - (height / 2);
        for (int i = 0; i < rating; ++i) {
            painter->drawPixmap(x, y, star);
            x += width;
        }
        drawFocus(painter, option, option.rect.adjusted(0, 0, -1, -1)); // since we draw the grid ourselves
    }

    QPen pen = painter->pen();
    painter->setPen(option.palette.color(QPalette::Mid));
    painter->drawLine(option.rect.bottomLeft(), option.rect.bottomRight());
    painter->drawLine(option.rect.topRight(), option.rect.bottomRight());
    painter->setPen(pen);
}

QSize BookDelegate::sizeHint(const QStyleOptionViewItem &option,
                                 const QModelIndex &index) const
{
    if (index.column() == 5)
        return QSize(5 * star.width(), star.height()) + QSize(1, 1);

    return QSqlRelationalDelegate::sizeHint(option, index) + QSize(1, 1); // since we draw the grid ourselves
}

bool BookDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
                               const QStyleOptionViewItem &option,
                               const QModelIndex &index)
{
    if (index.column() != 5)
        return QSqlRelationalDelegate::editorEvent(event, model, option, index);

    if (event->type() == QEvent::MouseButtonPress) {
        QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
        int stars = qBound(0, int(0.7 + qreal(mouseEvent->pos().x()
            - option.rect.x()) / star.width()), 5);
        model->setData(index, QVariant(stars));
        return false; //so that the selection can change
    }

    return true;
}

QWidget *BookDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                                    const QModelIndex &index) const
{
    if (index.column() != 4)
        return QSqlRelationalDelegate::createEditor(parent, option, index);

    // for editing the year, return a spinbox with a range from -1000 to 2100.
    QSpinBox *sb = new QSpinBox(parent);
    sb->setFrame(false);
    sb->setMaximum(2100);
    sb->setMinimum(-1000);

    return sb;
}