Qt点名器

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废话不多说，直接上代码。

CMakeLists.txt

cmake_minimum_required(VERSION 3.10)

project(qt-caller)

find_package(QT NAMES Qt6 Qt5 COMPONENTS Widgets REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Widgets REQUIRED)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

add_executable(qtCaller main.cpp widget.cpp widget.h)

target_link_libraries(qtCaller PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)

main.cpp

#include <QWidget>
#include <QApplication>
#include <QBoxLayout>
#include <QPushButton>
#include <QLabel>
#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Widget win;

    //设置窗口大小
    win.setMinimumSize(380,200);

    win.show();
    return app.exec();
}

widget.h

#include <QWidget>
#include <QFile>
#include <QTextStream>
#include <QFileDialog>
#include <QList>
#include <QRandomGenerator>
#include <QTimer>
#include <qapplication.h>
#include <qfont.h>
#include <qglobal.h>
#include <qgridlayout.h>
#include <qnamespace.h>
#include <qobjectdefs.h>
#include <qwindowdefs.h>

class Widget : public QWidget
{
    public:
        Widget();
        ~Widget();

    private:
        //声明控件
        QGridLayout *layout = new QGridLayout(this);
        QPushButton *pushButton = new QPushButton("开始");
        QLabel *label = new QLabel("预备备");

        //名单读取
        bool loadtxt();
        qint8 num = 0;
        QList<QString> namelists;

        //点名
        void caller();
        QTimer *timer = new QTimer(this);
        qint8 j = 0;

    private slots:
        //按钮事件
        void on_pushButton_clicked(bool checked);

        //播放名单
        void play_lists();
};

widget.cpp

#include "widget.h"
#include <QDebug>
#include <qdebug.h>
#include <qpushbutton.h>
#include <qrandom.h>
#include <qtimer.h>
#include <qwidget.h>

Widget::Widget()
{
    label->setAlignment(Qt::AlignCenter);
    label->setStyleSheet("border: 2px solid blue");
    label->setScaledContents(true);

    //设置字体大小
    QFont font;
    font.setPointSize(36);
    label->setFont(font);

    //添加控件至界面布局
    layout->addWidget(label, 0, 0, 1, 2);
    layout->addWidget(pushButton, 1, 0, 1, 2);

    //加载名单
    if(!loadtxt())
        qDebug() << "读取失败";
    else
        qDebug() << "读取成功";

    //连接按钮事件
    connect(pushButton,&QPushButton::clicked,this,&Widget::on_pushButton_clicked);

    //循环显示名单
    connect(timer,&QTimer::timeout,this,&Widget::play_lists);
    timer->start(100);

}

Widget::~Widget()
{
    //释放内存
    delete(pushButton);
    delete(label);
    delete(layout);
}

void Widget::on_pushButton_clicked(bool checked)
{
    if(checked == true)
    {
        pushButton->setText("开始");
        caller();
        pushButton->setCheckable(false);
    }
    else
    {
        pushButton->setText("停止");
        pushButton->setCheckable(true);
    }
}

bool Widget::loadtxt(void)
{
    QFile file("namelists.txt");
    if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
        return false;

    QTextStream nameFile(&file);

    while (!nameFile.atEnd()) {
        namelists << nameFile.readLine();
        num++;
    }

    return true;
}

void Widget::caller()
{
    qint32 i = QRandomGenerator::global()->bounded(0, num);
    label->setText(namelists[i]);
}

void Widget::play_lists()
{
    if(pushButton->isCheckable())
        label->setText(namelists[j++]);

    if(j >= num)
        j = 0;
}

效果图(screenshot)

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