Qt 5.11 | Qt Widgets | Star Delegate Example | stardelegate.cpp Example File

Qt 5.11.3 Reference Documentation

# stardelegate.cpp Example File

itemviews/stardelegate/stardelegate.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, 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 The Qt Company Ltd 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,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #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);
      }