Code Review Asked by 19172281 on November 25, 2021
I’ve put together my first table using Qt’s QTableView and a custom data model. Currently, some data is populated on initialisation, and the user has the option of adding and deleting entries.
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <iostream>
using namespace std;
QList<Contact> contacts;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QList<QString> contactNames;
QList<QString> contactPhoneNums;
contacts.append(Contact{4,"Adam"});
contacts.append(Contact{5,"James"});
contacts.append(Contact{2,"Emily"});
contacts.append(Contact{1,"Mark"});
// Create model:
PhoneBookModel = new TestModel(this);
// Connect model to table view:
ui->tableView->setModel(PhoneBookModel);
ui->tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
ui->tableView->setSelectionMode( QAbstractItemView::SingleSelection );
// Make table header visible and display table:
ui->tableView->horizontalHeader()->setVisible(true);
ui->tableView->show();
//slots to signals
connect(ui->tableView->selectionModel(), &QItemSelectionModel::selectionChanged, this, &MainWindow::foo);
}
void MainWindow::foo(){
QItemSelectionModel *selected = ui->tableView->selectionModel();
QModelIndexList rowList = selected->selectedRows();
if (rowList.size() == 0){
ui->label->setText("YAY");
ui->tableView->selectRow(0);
} else {
ui->label->setText(contacts.at(rowList.at(0).row()).name);
}
}
MainWindow::~MainWindow()
{
delete ui;
}
TestModel::TestModel(QObject *parent) : QAbstractTableModel(parent)
{
}
int TestModel::rowCount(const QModelIndex &parent) const
{
Q_UNUSED(parent);
return contacts.length();
}
int TestModel::columnCount(const QModelIndex &parent) const
{
Q_UNUSED(parent);
return 2;
}
QVariant TestModel::data(const QModelIndex &index, int role) const
{
if (!index.isValid() || role != Qt::DisplayRole) {
return QVariant();
}
if (index.column() == 0) {
return contacts[index.row()].id;
} else if (index.column() == 1) {
return contacts[index.row()].name;
}
return QVariant();
}
void TestModel::update(int row){
QModelIndex i = this->index(row,0,QModelIndex());
QModelIndex p = this->index(row,1,QModelIndex());
emit dataChanged(i,p);
emit layoutChanged();
}
QVariant TestModel::headerData(int section, Qt::Orientation orientation, int role) const
{
if (role == Qt::DisplayRole && orientation == Qt::Horizontal) {
if (section == 0) {
return QString("Name");
} else if (section == 1) {
return QString("Phone");
}
}
return QVariant();
}
void MainWindow::on_DeleteButton_clicked()
{
QItemSelectionModel *selected = ui->tableView->selectionModel();
QModelIndexList rowList = selected->selectedRows();
for (int i = 0; i < rowList.count(); i++)
{
contacts.removeAt(rowList.at(i).row());
if (rowList.at(i).row() == contacts.size()){ //last element
ui->tableView->selectRow(rowList.at(i).row()-1);
} else {
}
PhoneBookModel->update(rowList.at(i).row());
foo();
}
}
void MainWindow::on_AddButton_clicked()
{
int id = ui->id->text().toInt();
QString name = ui->name->text();
contacts.append(Contact{id,name});
PhoneBookModel->update(contacts.size()-1);
}
It all works fine, although I worry that I may be using QTableView incorrectly and/or inefficiently. Any suggestions on how to improve my code while maintaining the same functionality would be appreciated.
I can't find anything wrong.If really give some suggestions, it would be the case of the function name 'on_AddButton_clicked' and 'on_DeleteButton_clicked'.It will be better to use 'addButton' and 'deleteButton'.
Answered by StephennQin on November 25, 2021
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