qt5base-lts/examples/widgets/tutorials/addressbook/part3/addressbook.cpp

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#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"));
    addButton->show();
    submitButton = new QPushButton(tr("&Submit"));
    submitButton->hide();
    cancelButton = new QPushButton(tr("&Cancel"));
    cancelButton->hide();
//! [navigation pushbuttons]
    nextButton = new QPushButton(tr("&Next"));
    nextButton->setEnabled(false);
    previousButton = new QPushButton(tr("&Previous"));
    previousButton->setEnabled(false);
//! [navigation pushbuttons]

    connect(addButton, SIGNAL(clicked()), this, SLOT(addContact()));
    connect(submitButton, SIGNAL(clicked()), this, SLOT(submitContact()));
    connect(cancelButton, SIGNAL(clicked()), this, SLOT(cancel()));
//! [connecting navigation signals]    
    connect(nextButton, SIGNAL(clicked()), this, SLOT(next()));
    connect(previousButton, SIGNAL(clicked()), this, SLOT(previous()));
//! [connecting navigation signals]

    QVBoxLayout *buttonLayout1 = new QVBoxLayout;
    buttonLayout1->addWidget(addButton, Qt::AlignTop);
    buttonLayout1->addWidget(submitButton);
    buttonLayout1->addWidget(cancelButton);
    buttonLayout1->addStretch();
//! [navigation layout]
    QHBoxLayout *buttonLayout2 = new QHBoxLayout;
    buttonLayout2->addWidget(previousButton);
    buttonLayout2->addWidget(nextButton);
//! [ navigation layout]
    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);
//! [adding navigation layout]
    mainLayout->addLayout(buttonLayout2, 2, 1);
//! [adding navigation layout]
    setLayout(mainLayout);
    setWindowTitle(tr("Simple Address Book"));
}

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

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

    nameLine->setReadOnly(false);
    nameLine->setFocus(Qt::OtherFocusReason);
    addressText->setReadOnly(false);
    
    addButton->setEnabled(false);
//! [disabling navigation]
    nextButton->setEnabled(false);
    previousButton->setEnabled(false);
//! [disabling navigation]
    submitButton->show();
    cancelButton->show();
}

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 (!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));
    }

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

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

//! [enabling navigation]
    int number = contacts.size();
    nextButton->setEnabled(number > 1);
    previousButton->setEnabled(number > 1);
//! [enabling navigation]
    submitButton->hide();
    cancelButton->hide();
}

void AddressBook::cancel()
{
    nameLine->setText(oldName);
    addressText->setText(oldAddress);
   
    if (contacts.isEmpty()) {
        nameLine->clear();
        addressText->clear();
    }
    
    nameLine->setReadOnly(true);
    addressText->setReadOnly(true);
    addButton->setEnabled(true);
    
    int number = contacts.size();
    nextButton->setEnabled(number > 1);
    previousButton->setEnabled(number > 1);
    
    submitButton->hide();
    cancelButton->hide();
}

//! [next() function]
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());
}
//! [next() function]
//! [previous() function]
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());
}
//! [previous() function]