Qt 5.6 | Qt Widgets | Star Delegate Example | stardelegate.cpp Example File

Qt 5.6.2 Reference Documentation

# stardelegate.cpp Example File

itemviews/stardelegate/stardelegate.cpp

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      #include <QtWidgets>

      #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, &StarEditor::editingFinished,
                      this, &StarDelegate::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);
      }