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#include <QtGui>

#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, 3, 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 == "" || address == "") {

        QMessageBox::information(this, tr("Empty Field"),

            tr("Please enter a name and address."));

    }

    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]