parking_lot_sysytem/widget.cpp

#include "widget.h"
#include "ui_widget.h"


Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->log->setEnabled(false);


    //连接mqtt服务器，端口1883
    mqtt_client = new QMqttClient(this);
    mqtt_client->setHostname(hostname);
    mqtt_client->setPort(port);
    mqtt_client->setClientId("mobile");
    mqtt_client->setUsername("Phone");
    mqtt_client->setPassword("Phone");
    mqtt_client->connectToHost();
    connect(mqtt_client, &QMqttClient::disconnected, this, &Widget::disconnected_handler);
    connect(mqtt_client, &QMqttClient::messageReceived, this, &Widget::received_handler);
    connect(mqtt_client, &QMqttClient::pingResponseReceived, this, &Widget::pingresp_handler);
    connect(mqtt_client, &QMqttClient::connected, this, &Widget::connected_handler);
    connect(mqtt_client, &QMqttClient::errorChanged, this, &Widget::error_handler);
    connect(mqtt_client, &QMqttClient::stateChanged, this, &Widget::state_handler);

    connect(ui->pushButton, &QPushButton::clicked, [=]() {
        ui->stackedWidget->setCurrentIndex(0);
        });

    connect(ui->pushButton_2, &QPushButton::clicked, [=]() {
        ui->stackedWidget->setCurrentIndex(1);
        });

}



Widget::~Widget()
{
    delete ui;
}


//点击存车按钮
void Widget::on_pushButton_3_clicked()
{
    emit parking();
}

//点击取车按钮
void Widget::on_pushButton_4_clicked()
{
    if(ui->code->toPlainText().isEmpty())
    {
        QMessageBox::information(this,"取车错误","请先放置正确的取车码！");
    }
    emit pick_up(ui->code->toPlainText());
    ui->code->clear();
    ui->pushButton_3->setEnabled(true);
}

void Widget::connected_handler()
{
    const QString content = QDateTime::currentDateTime().toString()
                            +"\n"
                            +"MQTT服务器已连接上\n";
    ui->log->insertPlainText(content);
    sub = mqtt_client->subscribe(topic,1);
    if (sub)
    {
        const QString content = QDateTime::currentDateTime().toString()
                                +"\n"
                                +"Topic: "+ topic + QLatin1Char('\n')
                                +"Qos: "+QLatin1Char(sub->qos()+'0')+QLatin1Char('\n')+
                                "已订阅\n";
        ui->log->insertPlainText(content);
    }
    else
    {
        const QString content = QDateTime::currentDateTime().toString()
                                +"\n"
                                +"Topic: "+ topic + QLatin1Char('\n')
                                +"Qos: "+QLatin1Char(sub->qos()+'0')+QLatin1Char('\n')+
                                "订阅失败，请检查网络情况\n";
        ui->log->insertPlainText(content);
    }

}

void Widget::disconnected_handler()
{
    const QString content = QDateTime::currentDateTime().toString()
                            +"\n"
                            +"MQTT服务器已断开\n";
    ui->log->insertPlainText(content);

}

void Widget::received_handler(const QByteArray &message, const QMqttTopicName &topic)
{
    const QString content = QDateTime::currentDateTime().toString()
                            +"\n"
                            +"Topic: "+topic.name()+ QLatin1Char('\n')
                            +"Message: "+message+ QLatin1Char('\n')+
                            +"Qos: "+QLatin1Char(sub->qos()+'0')+QLatin1Char('\n');
    ui->log->insertPlainText(content);
}

void Widget::pingresp_handler()
{
    const QString content = QDateTime::currentDateTime().toString()
                            + QLatin1Char('\n')
                            + QLatin1String("MQTT Pong!")
                            + QLatin1Char('\n');
    ui->log->insertPlainText(content);
}

void Widget::state_handler()
{
    const QString content = QDateTime::currentDateTime().toString()
                            + QLatin1Char('\n')
                            + ":MQTT Client State Change"
                            + QString::number(mqtt_client->state())
                            + u'\n';
    ui->log->insertPlainText(content);
}

void Widget::error_handler(const QMqttClient::ClientError error)
{
    const QString content = QDateTime::currentDateTime().toString()
                            +"\n"
                            +"Error: "+ QString::number(static_cast<int>(error));
    ui->log->insertPlainText(content);
}


void Widget::disconnect_form_server()
{
    QMessageBox::critical(this,"连接超时","请检查您的网络连接！");
    qApp->quit();
}

void Widget::update_line(QString data)
{
    //向mqtt服务器发送路径消息
    qDebug() << "向mqtt服务器发送的路径消息" << data;














}

void Widget::update_code(QString code)
{
    if(code == "000")
    {
        QMessageBox::information(this,"消息","当前用户并无存车信息");
    }
    else
    {
        ui->code->setText(code);
        ui->pushButton_3->setEnabled(false);
    }
}

void Widget::handle_count(QString count)
{
    QString data = QString("当前剩余空位'%1'").arg(count);
    ui->label_4->setText(data);
    if(count.toInt() == 0)
    {
        ui->pushButton_3->setEnabled(false);
    }
    else
    {
        ui->pushButton_3->setEnabled(true);
    }
}

void Widget::on_pushButton_5_clicked()
{
    emit find_code();
    if(!ui->code->document()->isEmpty())
    {
        QMessageBox::information(this,"消息","已显示当前车位信息！");
    }
}


void Widget::on_pushButton_6_clicked()
{
    emit update_count();
}


void Widget::on_pushButton_7_clicked()
{
    ui->stackedWidget->setCurrentIndex(0);
}