addressbook.cpp Example File

 /****************************************************************************
 **
 ** 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 <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"));

     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);

     dialog = new FindDialog;

     connect(addButton, SIGNAL(clicked()), this, SLOT(addContact()));
     connect(submitButton, SIGNAL(clicked()), this, SLOT(submitContact()));
     connect(editButton, SIGNAL(clicked()), this, SLOT(editContact()));
     connect(cancelButton, SIGNAL(clicked()), this, SLOT(cancel()));
     connect(removeButton, SIGNAL(clicked()), this, SLOT(removeContact()));
     connect(findButton, SIGNAL(clicked()), this, SLOT(findContact()));
     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(findButton);
     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::findContact()
 {
     dialog->show();

     if (dialog->exec() == QDialog::Accepted) {
         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();
         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();
         break;
     }
 }