天天向上

mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QtConcurrent/QtConcurrentRun>

QT_BEGIN_NAMESPACE

namespace Ui { class MainWindow; }

QT_END_NAMESPACE

class MainWindow : public QMainWindow

{

 Q_OBJECT

public:

 MainWindow(QWidget *parent = nullptr);

 ~MainWindow();

private slots:

 void on_pushButton_start_clicked();

 void on_pushButton_stop_clicked();

private:

 Ui::MainWindow *ui;

 int counter;

 bool running;

private:

 void addCounter();

};

#endif // MAINWINDOW_H

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Change tabPosition
Change tabShape

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Unfortunately Qt creator in linux does not support BGR888 format, so we have to convert the image to RGB format by using cvtColor funtion before displaying it.

Mat img = imread("lena.jpg");

cvtColor(img, img, COLOR_BGR2RGB);

auto w = ui->label->width();

auto h = ui->label->height();

ui->label->setPixmap(

 QPixmap::fromImage(

 QImage(img.data, img.cols, img.rows, img.step, QImage::Format_RGB888)

 ).scaled(w, h, Qt::KeepAspectRatio)

);

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INCLUDEPATH += /usr/local/include/opencv4/

LIBS+= -L/usr/local/lib/ \

`pkg-config --cflags --libs opencv4`

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#include "mainwindow.h"

#include "ui_mainwindow.h"

#include <QMessageBox>

#include <QTime>

#include <QDebug>

MainWindow::MainWindow(QWidget *parent)

 : QMainWindow(parent)

 , ui(new Ui::MainWindow)

{

 ui->setupUi(this);

}

MainWindow::~MainWindow()

{

 delete ui;

}

void MainWindow::on_pushButton_clicked()

{

 QMessageBox::about(this, "About", "This is an about dialog");

}

void MainWindow::on_pushButton_2_clicked()

{

 QMessageBox::aboutQt(this, "Something about QT");

}

void MainWindow::on_pushButton_3_clicked()

{

 QMessageBox::critical(this,"Error occured","You should check out what happened!");

}

void MainWindow::on_pushButton_4_clicked()

{

 QTime dt_now = QTime::currentTime();

 QMessageBox::information(this, "Current Time: ", dt_now.toString());

}

void MainWindow::on_pushButton_5_clicked()

{

 QMessageBox::StandardButton reply = QMessageBox::question(this, "Login","Are you ready to go?",

 QMessageBox::Yes | QMessageBox::No);

 if(reply == QMessageBox::Yes)

 {

 QMessageBox::information(this, "Yes", "You've selected 'Yes' button");

 qDebug() << "Yes is clicked" << endl;

 }else if(reply == QMessageBox::No)

 {

 QMessageBox::information(this, "No", "You've selected 'No' button");

 qDebug() << "No is clicked" << endl;

 }

}

void MainWindow::on_pushButton_6_clicked()

{

 QMessageBox::warning(this, "Warning","Some warning messages have occured!");

}

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Downloading Git for Windows

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Platform: Windows 10
OpenCV: 4.2.0
Qt Creator: 4.11.0

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download Qt 5.14.1

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