Qt 5.6 | Qt Widgets | Combo Widget Mapper Example | window.cpp Example File

Qt 5.6.2 Reference Documentation

# window.cpp Example File

itemviews/combowidgetmapper/window.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
      **
      ** 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 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 "window.h"

      Window::Window(QWidget *parent)
          : QWidget(parent)
      {
          setupModel();

          nameLabel = new QLabel(tr("Na&me:"));
          nameEdit = new QLineEdit();
          addressLabel = new QLabel(tr("&Address:"));
          addressEdit = new QTextEdit();
          typeLabel = new QLabel(tr("&Type:"));
          typeComboBox = new QComboBox();
          nextButton = new QPushButton(tr("&Next"));
          previousButton = new QPushButton(tr("&Previous"));

          nameLabel->setBuddy(nameEdit);
          addressLabel->setBuddy(addressEdit);
          typeLabel->setBuddy(typeComboBox);

          typeComboBox->setModel(typeModel);

          mapper = new QDataWidgetMapper(this);
          mapper->setModel(model);
          mapper->addMapping(nameEdit, 0);
          mapper->addMapping(addressEdit, 1);
          mapper->addMapping(typeComboBox, 2, "currentIndex");

          connect(previousButton, &QAbstractButton::clicked,
                  mapper, &QDataWidgetMapper::toPrevious);
          connect(nextButton, &QAbstractButton::clicked,
                  mapper, &QDataWidgetMapper::toNext);
          connect(mapper, &QDataWidgetMapper::currentIndexChanged,
                  this, &Window::updateButtons);

          QGridLayout *layout = new QGridLayout();
          layout->addWidget(nameLabel, 0, 0, 1, 1);
          layout->addWidget(nameEdit, 0, 1, 1, 1);
          layout->addWidget(previousButton, 0, 2, 1, 1);
          layout->addWidget(addressLabel, 1, 0, 1, 1);
          layout->addWidget(addressEdit, 1, 1, 2, 1);
          layout->addWidget(nextButton, 1, 2, 1, 1);
          layout->addWidget(typeLabel, 3, 0, 1, 1);
          layout->addWidget(typeComboBox, 3, 1, 1, 1);
          setLayout(layout);

          setWindowTitle(tr("Delegate Widget Mapper"));
          mapper->toFirst();
      }

      void Window::setupModel()
      {
          QStringList items;
          items << tr("Home") << tr("Work") << tr("Other");
          typeModel = new QStringListModel(items, this);

          model = new QStandardItemModel(5, 3, this);
          QStringList names;
          names << "Alice" << "Bob" << "Carol" << "Donald" << "Emma";
          QStringList addresses;
          addresses << "<qt>123 Main Street<br/>Market Town</qt>"
                    << "<qt>PO Box 32<br/>Mail Handling Service"
                       "<br/>Service City</qt>"
                    << "<qt>The Lighthouse<br/>Remote Island</qt>"
                    << "<qt>47338 Park Avenue<br/>Big City</qt>"
                    << "<qt>Research Station<br/>Base Camp<br/>Big Mountain</qt>";

          QStringList types;
          types << "0" << "1" << "2" << "0" << "2";

          for (int row = 0; row < 5; ++row) {
            QStandardItem *item = new QStandardItem(names[row]);
            model->setItem(row, 0, item);
            item = new QStandardItem(addresses[row]);
            model->setItem(row, 1, item);
            item = new QStandardItem(types[row]);
            model->setItem(row, 2, item);
          }
      }

      void Window::updateButtons(int row)
      {
          previousButton->setEnabled(row > 0);
          nextButton->setEnabled(row < model->rowCount() - 1);
      }