- Qt 5.5
- Qt Widgets
- Part 4 - Editing and Removing Addresses
- addressbook.cpp Example File
- Qt 5.5.1 Reference Documentation

# addressbook.cpp Example File

tutorials/addressbook/part4/addressbook.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 "addressbook.h"

    AddressBook::AddressBook(QWidget *parent)
        : QWidget(parent)
    {
        QLabel *nameLabel = new QLabel(tr("Name:"));
        nameLine = new QLineEdit;
        nameLine->setReadOnly(true);

        QLabel *addressLabel = new QLabel(tr("Address:"));
        addressText = new QTextEdit;
        addressText->setReadOnly(true);

        addButton = new QPushButton(tr("&Add"));
        editButton = new QPushButton(tr("&Edit"));
        editButton->setEnabled(false);
        removeButton = new QPushButton(tr("&Remove"));
        removeButton->setEnabled(false);
        submitButton = new QPushButton(tr("&Submit"));
        submitButton->hide();
        cancelButton = new QPushButton(tr("&Cancel"));
        cancelButton->hide();

        nextButton = new QPushButton(tr("&Next"));
        nextButton->setEnabled(false);
        previousButton = new QPushButton(tr("&Previous"));
        previousButton->setEnabled(false);

        connect(addButton, SIGNAL(clicked()), this, SLOT(addContact()));
        connect(submitButton, SIGNAL(clicked()), this, SLOT(submitContact()));
        connect(editButton, SIGNAL(clicked()), this, SLOT(editContact()));
        connect(removeButton, SIGNAL(clicked()), this, SLOT(removeContact()));
        connect(cancelButton, SIGNAL(clicked()), this, SLOT(cancel()));
        connect(nextButton, SIGNAL(clicked()), this, SLOT(next()));
        connect(previousButton, SIGNAL(clicked()), this, SLOT(previous()));

        QVBoxLayout *buttonLayout1 = new QVBoxLayout;
        buttonLayout1->addWidget(addButton);
        buttonLayout1->addWidget(editButton);
        buttonLayout1->addWidget(removeButton);
        buttonLayout1->addWidget(submitButton);
        buttonLayout1->addWidget(cancelButton);
        buttonLayout1->addStretch();

        QHBoxLayout *buttonLayout2 = new QHBoxLayout;
        buttonLayout2->addWidget(previousButton);
        buttonLayout2->addWidget(nextButton);

        QGridLayout *mainLayout = new QGridLayout;
        mainLayout->addWidget(nameLabel, 0, 0);
        mainLayout->addWidget(nameLine, 0, 1);
        mainLayout->addWidget(addressLabel, 1, 0, Qt::AlignTop);
        mainLayout->addWidget(addressText, 1, 1);
        mainLayout->addLayout(buttonLayout1, 1, 2);
        mainLayout->addLayout(buttonLayout2, 2, 1);

        setLayout(mainLayout);
        setWindowTitle(tr("Simple Address Book"));
    }

    void AddressBook::addContact()
    {
        oldName = nameLine->text();
        oldAddress = addressText->toPlainText();

        nameLine->clear();
        addressText->clear();

        updateInterface(AddingMode);
    }
    void AddressBook::editContact()
    {
        oldName = nameLine->text();
        oldAddress = addressText->toPlainText();

        updateInterface(EditingMode);
    }
    void AddressBook::submitContact()
    {
        QString name = nameLine->text();
        QString address = addressText->toPlainText();

        if (name.isEmpty() || address.isEmpty()) {
            QMessageBox::information(this, tr("Empty Field"),
                tr("Please enter a name and address."));
            return;
        }
        if (currentMode == AddingMode) {

            if (!contacts.contains(name)) {
                contacts.insert(name, address);
                QMessageBox::information(this, tr("Add Successful"),
                    tr("\"%1\" has been added to your address book.").arg(name));
            } else {
                QMessageBox::information(this, tr("Add Unsuccessful"),
                    tr("Sorry, \"%1\" is already in your address book.").arg(name));
            }
        } else if (currentMode == EditingMode) {

            if (oldName != name) {
                if (!contacts.contains(name)) {
                    QMessageBox::information(this, tr("Edit Successful"),
                        tr("\"%1\" has been edited in your address book.").arg(oldName));
                    contacts.remove(oldName);
                    contacts.insert(name, address);
                } else {
                    QMessageBox::information(this, tr("Edit Unsuccessful"),
                        tr("Sorry, \"%1\" is already in your address book.").arg(name));
                }
            } else if (oldAddress != address) {
                QMessageBox::information(this, tr("Edit Successful"),
                    tr("\"%1\" has been edited in your address book.").arg(name));
                contacts[name] = address;
            }
        }

        updateInterface(NavigationMode);
    }

    void AddressBook::cancel()
    {
        nameLine->setText(oldName);
        addressText->setText(oldAddress);
        updateInterface(NavigationMode);
    }
    void AddressBook::removeContact()
    {
        QString name = nameLine->text();
        QString address = addressText->toPlainText();

        if (contacts.contains(name)) {

            int button = QMessageBox::question(this,
                tr("Confirm Remove"),
                tr("Are you sure you want to remove \"%1\"?").arg(name),
                QMessageBox::Yes | QMessageBox::No);

            if (button == QMessageBox::Yes) {

                previous();
                contacts.remove(name);

                QMessageBox::information(this, tr("Remove Successful"),
                    tr("\"%1\" has been removed from your address book.").arg(name));
            }
        }

        updateInterface(NavigationMode);
    }
    void AddressBook::next()
    {
        QString name = nameLine->text();
        QMap<QString, QString>::iterator i = contacts.find(name);

        if (i != contacts.end())
            i++;

        if (i == contacts.end())
            i = contacts.begin();

        nameLine->setText(i.key());
        addressText->setText(i.value());
    }

    void AddressBook::previous()
    {
        QString name = nameLine->text();
        QMap<QString, QString>::iterator i = contacts.find(name);

        if (i == contacts.end()) {
            nameLine->clear();
            addressText->clear();
            return;
        }

        if (i == contacts.begin())
            i = contacts.end();

        i--;
        nameLine->setText(i.key());
        addressText->setText(i.value());
    }
    void AddressBook::updateInterface(Mode mode)
    {
        currentMode = mode;

        switch (currentMode) {

        case AddingMode:
        case EditingMode:

            nameLine->setReadOnly(false);
            nameLine->setFocus(Qt::OtherFocusReason);
            addressText->setReadOnly(false);

            addButton->setEnabled(false);
            editButton->setEnabled(false);
            removeButton->setEnabled(false);

            nextButton->setEnabled(false);
            previousButton->setEnabled(false);

            submitButton->show();
            cancelButton->show();
            break;
        case NavigationMode:

            if (contacts.isEmpty()) {
                nameLine->clear();
                addressText->clear();
            }

            nameLine->setReadOnly(true);
            addressText->setReadOnly(true);
            addButton->setEnabled(true);

            int number = contacts.size();
            editButton->setEnabled(number >= 1);
            removeButton->setEnabled(number >= 1);
            nextButton->setEnabled(number > 1);
            previousButton->setEnabled(number >1 );

            submitButton->hide();
            cancelButton->hide();
            break;
        }
    }