QThread demo using worker model

main.cpp

#include <QApplication>
#include <QObject>
#include <QTextEdit>
#include <QThread>
#include <QVBoxLayout>
#include <QWidget>
#include <QtWidgets>

class Worker : public QObject {
    Q_OBJECT
  public slots:
    void doWork() {
        QThread::sleep(5);
        emit resultReady("Workers are the best");
    }
  signals:
    void resultReady(const QString &data);
};

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);

    /* Simple UI*/
    auto widget = new QWidget();
    auto vLayout = new QVBoxLayout(widget);
    auto textEdit = new QTextEdit(widget);
    vLayout->addWidget(textEdit);
    vLayout->addWidget(new QPushButton("click me to test blocking UI", widget));

    /* Setup thread */
    auto thread = new QThread(widget);
    auto worker = new Worker();
    worker->moveToThread(thread);

    QObject::connect(thread, &QThread::finished, worker, &QObject::deleteLater);
    QObject::connect(thread, &QThread::started, worker, &Worker::doWork);
    QObject::connect(worker, &Worker::resultReady, textEdit, &QTextEdit::append);

    /* Start working*/
    thread->start();

    widget->show();

    return a.exec();
}

/* If define class QT in cpp file, have to add this include to bypass build
 * error */
/* https://stackoverflow.com/a/41844844 */
#include "main.moc"

thread-worker.pro

#-------------------------------------------------
#
# Project created by QtCreator 2019-06-17T22:08:10
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = thread-worker
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0


SOURCES += main.cpp