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

Qt Reference Documentation

# stardelegate.cpp Example File

itemviews/stardelegate/stardelegate.cpp

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     ** This file is part of the examples of the Qt Toolkit.
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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);
     }