Qt 4.8: stardelegate.cpp Example File (itemviews/stardelegate/stardelegate.cpp)

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# stardelegate.cpp Example File

itemviews/stardelegate/stardelegate.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** 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 Digia Plc and its Subsidiary(-ies) 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,
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     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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     ****************************************************************************/

     #include <QtGui>

     #include "stardelegate.h"
     #include "stareditor.h"
     #include "starrating.h"

     void StarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                              const QModelIndex &index) const
     {
         if (index.data().canConvert<StarRating>()) {
             StarRating starRating = qvariant_cast<StarRating>(index.data());

             if (option.state & QStyle::State_Selected)
                 painter->fillRect(option.rect, option.palette.highlight());

             starRating.paint(painter, option.rect, option.palette,
                              StarRating::ReadOnly);
         } else {
             QStyledItemDelegate::paint(painter, option, index);
         }
     }

     QSize StarDelegate::sizeHint(const QStyleOptionViewItem &option,
                                  const QModelIndex &index) const
     {
         if (index.data().canConvert<StarRating>()) {
             StarRating starRating = qvariant_cast<StarRating>(index.data());
             return starRating.sizeHint();
         } else {
             return QStyledItemDelegate::sizeHint(option, index);
         }
     }

     QWidget *StarDelegate::createEditor(QWidget *parent,
                                         const QStyleOptionViewItem &option,
                                         const QModelIndex &index) const

     {
         if (index.data().canConvert<StarRating>()) {
             StarEditor *editor = new StarEditor(parent);
             connect(editor, SIGNAL(editingFinished()),
                     this, SLOT(commitAndCloseEditor()));
             return editor;
         } else {
             return QStyledItemDelegate::createEditor(parent, option, index);
         }
     }

     void StarDelegate::setEditorData(QWidget *editor,
                                      const QModelIndex &index) const
     {
         if (index.data().canConvert<StarRating>()) {
             StarRating starRating = qvariant_cast<StarRating>(index.data());
             StarEditor *starEditor = qobject_cast<StarEditor *>(editor);
             starEditor->setStarRating(starRating);
         } else {
             QStyledItemDelegate::setEditorData(editor, index);
         }
     }

     void StarDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                     const QModelIndex &index) const
     {
         if (index.data().canConvert<StarRating>()) {
             StarEditor *starEditor = qobject_cast<StarEditor *>(editor);
             model->setData(index, QVariant::fromValue(starEditor->starRating()));
         } else {
             QStyledItemDelegate::setModelData(editor, model, index);
         }
     }

     void StarDelegate::commitAndCloseEditor()
     {
         StarEditor *editor = qobject_cast<StarEditor *>(sender());
         emit commitData(editor);
         emit closeEditor(editor);
     }