Part 4 - Editing and Removing Addresses▲
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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"));
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;
}
}