qt-everywhere-src-5.15.1/qtbase/examples/widgets/tutorials/addressbook/part7/addressbook.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, 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);
     findButton = new QPushButton(tr("&Find"));
     findButton->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);

     loadButton = new QPushButton(tr("&Load..."));
     loadButton->setToolTip(tr("Load contacts from a file"));
     saveButton = new QPushButton(tr("&Save..."));
     saveButton->setToolTip(tr("Save contacts to a file"));
     saveButton->setEnabled(false);

     exportButton = new QPushButton(tr("E&xport"));
     exportButton->setToolTip(tr("Export as vCard"));
     exportButton->setEnabled(false);

     dialog = new FindDialog(this);

     connect(addButton, &QPushButton::clicked,
             this, &AddressBook::addContact);
     connect(submitButton, &QPushButton::clicked,
             this, &AddressBook::submitContact);
     connect(editButton, &QPushButton::clicked,
             this, &AddressBook::editContact);
     connect(removeButton, &QPushButton::clicked,
             this, &AddressBook::removeContact);
     connect(cancelButton, &QPushButton::clicked,
             this, &AddressBook::cancel);
     connect(findButton, &QPushButton::clicked,
             this, &AddressBook::findContact);
     connect(nextButton, &QPushButton::clicked,
             this, &AddressBook::next);
     connect(previousButton, &QPushButton::clicked,
             this, &AddressBook::previous);
     connect(loadButton, &QPushButton::clicked,
             this, &AddressBook::loadFromFile);
     connect(saveButton, &QPushButton::clicked,
             this, &AddressBook::saveToFile);
     connect(exportButton, &QPushButton::clicked,
             this, &AddressBook::exportAsVCard);

     QVBoxLayout *buttonLayout1 = new QVBoxLayout;
     buttonLayout1->addWidget(addButton);
     buttonLayout1->addWidget(editButton);
     buttonLayout1->addWidget(removeButton);
     buttonLayout1->addWidget(findButton);
     buttonLayout1->addWidget(submitButton);
     buttonLayout1->addWidget(cancelButton);
     buttonLayout1->addWidget(loadButton);
     buttonLayout1->addWidget(saveButton);
     buttonLayout1->addWidget(exportButton);
     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::findContact()
 {
     dialog->show();

     if (dialog->exec() == 1) {
         QString contactName = dialog->getFindText();

         if (contacts.contains(contactName)) {
             nameLine->setText(contactName);
             addressText->setText(contacts.value(contactName));
         } else {
             QMessageBox::information(this, tr("Contact Not Found"),
                 tr("Sorry, \"%1\" is not in your address book.").arg(contactName));
             return;
         }
     }

     updateInterface(NavigationMode);
 }
 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();

         loadButton->setEnabled(false);
         saveButton->setEnabled(false);
         exportButton->setEnabled(false);
         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);
         findButton->setEnabled(number > 2);
         nextButton->setEnabled(number > 1);
         previousButton->setEnabled(number > 1);

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

         exportButton->setEnabled(number >= 1);

         loadButton->setEnabled(true);
         saveButton->setEnabled(number >= 1);
         break;
     }
 }

 void AddressBook::saveToFile()
 {
     QString fileName = QFileDialog::getSaveFileName(this,
         tr("Save Address Book"), "",
         tr("Address Book (*.abk);;All Files (*)"));

     if (fileName.isEmpty())
         return;
     else {
         QFile file(fileName);

         if (!file.open(QIODevice::WriteOnly)) {
             QMessageBox::information(this, tr("Unable to open file"),
                 file.errorString());
             return;
         }

         QDataStream out(&file);
         out.setVersion(QDataStream::Qt_4_3);
         out << contacts;
     }

     updateInterface(NavigationMode);
 }

 void AddressBook::loadFromFile()
 {
     QString fileName = QFileDialog::getOpenFileName(this,
         tr("Open Address Book"), "",
         tr("Address Book (*.abk);;All Files (*)"));

     if (fileName.isEmpty())
         return;
     else {
         QFile file(fileName);

         if (!file.open(QIODevice::ReadOnly)) {
             QMessageBox::information(this, tr("Unable to open file"),
                 file.errorString());
             return;
         }

         QDataStream in(&file);
         in.setVersion(QDataStream::Qt_4_3);
         in >> contacts;

         QMap<QString, QString>::iterator i = contacts.begin();
         nameLine->setText(i.key());
         addressText->setText(i.value());
     }

     updateInterface(NavigationMode);
 }

 //! [export function part1]
 void AddressBook::exportAsVCard()
 {
     QString name = nameLine->text();
     QString address = addressText->toPlainText();
     QString firstName;
     QString lastName;
     QStringList nameList;

     int index = name.indexOf(" ");

     if (index != -1) {
         nameList = name.split(QRegularExpression("\\s+"), Qt::SkipEmptyParts);
         firstName = nameList.first();
         lastName = nameList.last();
     } else {
         firstName = name;
         lastName = "";
     }

     QString fileName = QFileDialog::getSaveFileName(this,
         tr("Export Contact"), "",
         tr("vCard Files (*.vcf);;All Files (*)"));

     if (fileName.isEmpty())
         return;

     QFile file(fileName);
 //! [export function part1]

 //! [export function part2]
     if (!file.open(QIODevice::WriteOnly)) {
         QMessageBox::information(this, tr("Unable to open file"),
             file.errorString());
         return;
     }

     QTextStream out(&file);
 //! [export function part2]

 //! [export function part3]
     out << "BEGIN:VCARD" << '\n';
     out << "VERSION:2.1" << '\n';
     out << "N:" << lastName << ';' << firstName << '\n';

     if (!nameList.isEmpty())
        out << "FN:" << nameList.join(' ') << '\n';
     else
        out << "FN:" << firstName << '\n';
 //! [export function part3]

 //! [export function part4]
     address.replace(";", "\\;", Qt::CaseInsensitive);
     address.replace('\n', ";", Qt::CaseInsensitive);
     address.replace(",", " ", Qt::CaseInsensitive);

     out << "ADR;HOME:;" << address << '\n';
     out << "END:VCARD" << '\n';

     QMessageBox::information(this, tr("Export Successful"),
         tr("\"%1\" has been exported as a vCard.").arg(name));
 }
 //! [export function part4]
	/****************************************************************************
	**
	** Copyright (C) 2016 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the examples of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:BSD$
	** Commercial License Usage
	** Licensees holding valid commercial Qt licenses may use this file in
	** accordance with the commercial license agreement provided with the
	** Software or, alternatively, in accordance with the terms contained in
	** a written agreement between you and The Qt Company. For licensing terms
	** and conditions see https://www.qt.io/terms-conditions. For further
	** information use the contact form at https://www.qt.io/contact-us.
	**
	** BSD License Usage
	** Alternatively, 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);
	findButton = new QPushButton(tr("&Find"));
	findButton->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);

	loadButton = new QPushButton(tr("&Load..."));
	loadButton->setToolTip(tr("Load contacts from a file"));
	saveButton = new QPushButton(tr("&Save..."));
	saveButton->setToolTip(tr("Save contacts to a file"));
	saveButton->setEnabled(false);

	exportButton = new QPushButton(tr("E&xport"));
	exportButton->setToolTip(tr("Export as vCard"));
	exportButton->setEnabled(false);

	dialog = new FindDialog(this);

	connect(addButton, &QPushButton::clicked,
	this, &AddressBook::addContact);
	connect(submitButton, &QPushButton::clicked,
	this, &AddressBook::submitContact);
	connect(editButton, &QPushButton::clicked,
	this, &AddressBook::editContact);
	connect(removeButton, &QPushButton::clicked,
	this, &AddressBook::removeContact);
	connect(cancelButton, &QPushButton::clicked,
	this, &AddressBook::cancel);
	connect(findButton, &QPushButton::clicked,
	this, &AddressBook::findContact);
	connect(nextButton, &QPushButton::clicked,
	this, &AddressBook::next);
	connect(previousButton, &QPushButton::clicked,
	this, &AddressBook::previous);
	connect(loadButton, &QPushButton::clicked,
	this, &AddressBook::loadFromFile);
	connect(saveButton, &QPushButton::clicked,
	this, &AddressBook::saveToFile);
	connect(exportButton, &QPushButton::clicked,
	this, &AddressBook::exportAsVCard);

	QVBoxLayout *buttonLayout1 = new QVBoxLayout;
	buttonLayout1->addWidget(addButton);
	buttonLayout1->addWidget(editButton);
	buttonLayout1->addWidget(removeButton);
	buttonLayout1->addWidget(findButton);
	buttonLayout1->addWidget(submitButton);
	buttonLayout1->addWidget(cancelButton);
	buttonLayout1->addWidget(loadButton);
	buttonLayout1->addWidget(saveButton);
	buttonLayout1->addWidget(exportButton);
	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::findContact()
	{
	dialog->show();

	if (dialog->exec() == 1) {
	QString contactName = dialog->getFindText();

	if (contacts.contains(contactName)) {
	nameLine->setText(contactName);
	addressText->setText(contacts.value(contactName));
	} else {
	QMessageBox::information(this, tr("Contact Not Found"),
	tr("Sorry, \"%1\" is not in your address book.").arg(contactName));
	return;
	}
	}

	updateInterface(NavigationMode);
	}
	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();

	loadButton->setEnabled(false);
	saveButton->setEnabled(false);
	exportButton->setEnabled(false);
	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);
	findButton->setEnabled(number > 2);
	nextButton->setEnabled(number > 1);
	previousButton->setEnabled(number > 1);

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

	exportButton->setEnabled(number >= 1);

	loadButton->setEnabled(true);
	saveButton->setEnabled(number >= 1);
	break;
	}
	}

	void AddressBook::saveToFile()
	{
	QString fileName = QFileDialog::getSaveFileName(this,
	tr("Save Address Book"), "",
	tr("Address Book (.abk);;All Files ()"));

	if (fileName.isEmpty())
	return;
	else {
	QFile file(fileName);

	if (!file.open(QIODevice::WriteOnly)) {
	QMessageBox::information(this, tr("Unable to open file"),
	file.errorString());
	return;
	}

	QDataStream out(&file);
	out.setVersion(QDataStream::Qt_4_3);
	out << contacts;
	}

	updateInterface(NavigationMode);
	}

	void AddressBook::loadFromFile()
	{
	QString fileName = QFileDialog::getOpenFileName(this,
	tr("Open Address Book"), "",
	tr("Address Book (.abk);;All Files ()"));

	if (fileName.isEmpty())
	return;
	else {
	QFile file(fileName);

	if (!file.open(QIODevice::ReadOnly)) {
	QMessageBox::information(this, tr("Unable to open file"),
	file.errorString());
	return;
	}

	QDataStream in(&file);
	in.setVersion(QDataStream::Qt_4_3);
	in >> contacts;

	QMap<QString, QString>::iterator i = contacts.begin();
	nameLine->setText(i.key());
	addressText->setText(i.value());
	}

	updateInterface(NavigationMode);
	}

	//! [export function part1]
	void AddressBook::exportAsVCard()
	{
	QString name = nameLine->text();
	QString address = addressText->toPlainText();
	QString firstName;
	QString lastName;
	QStringList nameList;

	int index = name.indexOf(" ");

	if (index != -1) {
	nameList = name.split(QRegularExpression("\\s+"), Qt::SkipEmptyParts);
	firstName = nameList.first();
	lastName = nameList.last();
	} else {
	firstName = name;
	lastName = "";
	}

	QString fileName = QFileDialog::getSaveFileName(this,
	tr("Export Contact"), "",
	tr("vCard Files (.vcf);;All Files ()"));

	if (fileName.isEmpty())
	return;

	QFile file(fileName);
	//! [export function part1]

	//! [export function part2]
	if (!file.open(QIODevice::WriteOnly)) {
	QMessageBox::information(this, tr("Unable to open file"),
	file.errorString());
	return;
	}

	QTextStream out(&file);
	//! [export function part2]

	//! [export function part3]
	out << "BEGIN:VCARD" << '\n';
	out << "VERSION:2.1" << '\n';
	out << "N:" << lastName << ';' << firstName << '\n';

	if (!nameList.isEmpty())
	out << "FN:" << nameList.join(' ') << '\n';
	else
	out << "FN:" << firstName << '\n';
	//! [export function part3]

	//! [export function part4]
	address.replace(";", "\\;", Qt::CaseInsensitive);
	address.replace('\n', ";", Qt::CaseInsensitive);
	address.replace(",", " ", Qt::CaseInsensitive);

	out << "ADR;HOME:;" << address << '\n';
	out << "END:VCARD" << '\n';

	QMessageBox::information(this, tr("Export Successful"),
	tr("\"%1\" has been exported as a vCard.").arg(name));
	}
	//! [export function part4]