- Qt 5.5
- Qt Widgets
- Combo Widget Mapper Example
- window.cpp Example File
- Qt 5.5.1 Reference Documentation

# window.cpp Example File

itemviews/combowidgetmapper/window.cpp

    /****************************************************************************
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    ** 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:
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    #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, SIGNAL(clicked()),
                mapper, SLOT(toPrevious()));
        connect(nextButton, SIGNAL(clicked()),
                mapper, SLOT(toNext()));
        connect(mapper, SIGNAL(currentIndexChanged(int)),
                this, SLOT(updateButtons(int)));

        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);
    }