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LoginDialog::LoginDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::LoginDialog)
{
    ui->setupUi(this);
    ui->imgLabel->setScaledContents(true);// Set the fill 
    this->resize(ui->imgLabel->width(),ui->imgLabel->height());// Set window size 

    // Set the window title 
    this->setWindowTitle((" Driving school subject one test login "));
    // Set the window style 
    this->setWindowFlags(Qt::Dialog |Qt::WindowCloseButtonHint);
}

2. Login function realization

2.1 Verify email address

First, judge whether the entered account conforms to the email format , If yes, login and verify , Otherwise, the prompt format is incorrect

void LoginDialog::on_loginButton_clicked()
{
    // First, determine whether the account is a legal email format through regular expressions 
    //^： Indicates the beginning of the rule string 、$： Indicates the end of the rule string 
    //+： Indicates the number of matches ≥1 Time 、*： It means matching any number of times ( for 0 Time ) {n,m} Indicates the least number of matches n Time   most m Time 
    QRegExp rx("^[A-Za-z0-9]+([_\.][A-Za-z0-9]+)*@([A-Za-z0-9\-]+\.)+[A-Za-z]{2,6}$");// Specify the rule string during initialization 
    bool res = rx.exactMatch(ui->accountEdit->text());// Match the account number entered by the user 
    if(res){// The match is successful 
        QMessageBox::information(this," Tips "," Welcome to the subject one examination subject system ");
    }else{// The match didn't work 
        QMessageBox::information(this," Tips "," Illegal email address ！ Please re-enter ");
        ui->accountEdit->clear();// Clear the account input box 
        ui->codeEdit->clear();// Clear the password input box 
        ui->accountEdit->setFocus();// The account input box focuses 
        return ; 
    }

}

2.2 Account password login

When the account format is legal , Read the document that saves the account and password to match

if(res){// The match is successful 
//QMessageBox::information(this," Tips "," Welcome to the subject one examination subject system ");
QString filename;// File path 
QString AccInput;// User input account number 
QString strCode;// User enters password 
QString strLine;// Read one line of data at a time 
QStringList strList;// Split and read a row of data 

filename="../account.txt";// Set file path 
AccInput=ui->accountEdit->text();// Get account number 
strCode=ui->codeEdit->text();// Get password 

QFile file(filename);// initialization 
QTextStream stream(&file);// Text type file stream 
// Specify read-only mode to open , Specify file type text type 
if(file.open(QIODevice::ReadOnly|QIODevice::Text)){
    // Open the success 
    while(!stream.atEnd()){
        strLine=stream.readLine();// Read one line at a time 
        strList = strLine.split(",");// Press "," Division 
        if(AccInput==strList.at(0)){
            if(strCode==strList.at(1)){
                // The account and password match successfully 
                QMessageBox::information(this," Tips "," Welcome to subject one examination system ");
                file.close();
                return ;
            }else{
                // Account matching succeeded & Password failed 
                QMessageBox::information(this," Tips "," Wrong password ！ Please re-enter ！");
                ui->codeEdit->clear();
                ui->codeEdit->setFocus();
                file.close();
                return ;
            }
        }
    }
    QMessageBox::information(this," Tips "," Incorrect account number entered ！ Please re-enter ！");
    ui->accountEdit->clear();// Clear the account input box 
    ui->codeEdit->clear();// Clear the password input box 
    ui->accountEdit->setFocus();// The account input box focuses 
    file.close();
    return;
}

2.3 Password hiding

Set the password control's echoMode Property value changed to Password that will do

3. Examination interface development

3.1 Exam time

First, add an exam dialog class ; Add QTimer and int Properties are used to represent timers and elapsed time ; Set the timer interval to 1s, adopt connect Function to connect the timer with the used time display signal slot

examDialog.h

#ifndef EXAMDIALOG_H
#define EXAMDIALOG_H
#include<QDialog>
#include<QTimer>
class ExamDialog : public QDialog
{
    Q_OBJECT// Use the signal slot 
public:
    ExamDialog(QWidget* parent=0);
    void initTimer();
private:
    QTimer*m_timer;// timer 
    int m_timeGo;// The exam has taken time 
private slots:  // Private slot method 
    void freshTime();
};

#endif // EXAMDIALOG_H

examDialog.cpp

#include "examdialog.h"

ExamDialog::ExamDialog(QWidget* parent):QDialog(parent)
{
    setWindowTitle(" The exam has taken time ：0 branch 0 second ");
    initTimer();
}

void ExamDialog::initTimer()
{
    m_timeGo=0;
    m_timer=new QTimer(this);
    m_timer->setInterval(1000);// Set timer interval 1s
    m_timer->start();// Start the timer 
    // adopt connect Method , Connect the signal slot .m_timer Per send timeout() Signal time , from this Execute slot method freshTime()
    connect(m_timer,SIGNAL(timeout()),this,SLOT(freshTime()));


}

void ExamDialog::freshTime()
{
    // Refresh exam time 
    m_timeGo++;
    QString min=QString::number(m_timeGo/60);// Count the minutes , Convert an integer to QString
    QString sec=QString::number(m_timeGo%60);
    setWindowTitle(" The exam has taken time ："+min+" branch "+sec+" second ");
}

3.2 Topic layout

Add attributes and initialization methods

public:
    void initLayout();  // Initialize layout manager 
    bool initTextEdit();// Initialize the text editor 
    void initButton();  // Initialize buttons and labels 
private:

    QTextEdit*m_textEdit;       // The exam question bank displays 
    QLabel*m_titleLabels[10];   // Title Tag 
    QRadioButton *m_radioBtns[32];// Radio button 
    QCheckBox *m_checkBtn[4];   // Multiple choice button 
    QRadioButton *m_radioA;     // Judgment questions A Options 
    QRadioButton *m_radioB;     // Judgment questions B Options 
    QGridLayout*m_layout;       // Layout manager 
    QStringList m_answerList;   // answer

stay initLayout Function , Set the current window as the parent window of the manager , Specify the distance between controls and the distance between controls and forms

void ExamDialog::initLayout()
{
    // Take the current window as the parent window 
    m_layout=new QGridLayout(this);
    m_layout->setSpacing(10);// Set spacing between controls 
    m_layout->setMargin(10);// Set the margins of the form and control keys 

}

stay initTextEdit Function , Read the question information in the text and store the answer line separately , Display the read topic information in the control , And give the control to the layout manager to layout on the form .

bool ExamDialog::initTextEdit()
{
    QString strLine;// Save file answer line data 
    QStringList strList;// Save the read answer line 
    QString fileName("../exam.txt");
    QFile file(fileName);
    QTextStream stream(&file);// Text type file stream 
    stream.setCodec("UTF-8");// Specified encoding 

    if(file.open(QIODevice::ReadOnly|QIODevice::Text)){
        // Take the current window as the parent window 
        m_textEdit=new QTextEdit(this);
        m_textEdit->setReadOnly(true);// Set text read-only 
        QString strText;// Used to save the data displayed in the text editor 
        int nLines = 0;
        while(!stream.atEnd()){
            if(nLines==0){// Filter first line 
                stream.readLine();
                nLines++;
                continue;
            }else if((nLines%6==0&&nLines>=6&&nLines<=6*9)||nLines==6*9+4){// Filter the answer line 
                strLine = stream.readLine();
                strList=strLine.split(" ");// Split the answer of the answer line through the space 
                m_answerList.append(strList.at(1));// Get the answer 
                strText+="\n";
                nLines++;
                continue;
            }
            strText+= stream.readLine();// Read a line 
            strText+="\n";
            nLines++;
        }
        // Show text content 
        m_textEdit->setText(strText);
        // Add the control to the layout manager 
        m_layout->addWidget(m_textEdit,0,0,1,10);
        file.close();
        return true;// Finished reading 
    }else{

        return false;
    }
}

Set the background and font of the form in the initialization function

ExamDialog::ExamDialog(QWidget* parent):QDialog(parent)
{
    // Set font size 
    QFont font;
    font.setPointSize(12);
    setFont(font);// Set the font of the current window 

    // Set the form background color 
    setPalette(QPalette(QColor(209,215,255)));

    setWindowTitle(" The exam has taken time ：0 branch 0 second ");
    setWindowFlags(Qt::Dialog|Qt::WindowCloseButtonHint);
    resize(800,900);// Set the window size 

    initTimer();
    initLayout();
    if(initTextEdit()){

    }else{
        // Read failed 
        QMessageBox::information(this," Tips "," Failed to initialize the question bank data file ！");
        // The current application immediately responds to the slot method quit
        QTimer::singleShot(0,qApp,SLOT(quit()));
    }
}

3.3 Button layout

The layout method is to initialize the control first , Then give it to the layout manager for layout . But note the grouping of radio buttons ： The four buttons of each radio choice question form a group , The two buttons of the true and false questions are a group

The newly added QbuttonGroup attribute

private:
    QButtonGroup* m_btnGroups[9];// Radio button grouping

In the initial button change function

void ExamDialog::initButton()
{
    QStringList strList={"A","B","C","D"};

    for(int i=0;i<10;++i){
        // Title Tag 
        m_titleLabels[i]=new QLabel(this);// The current window is initialized as the parent window 
        m_titleLabels[i]->setText(" The first "+QString::number(i+1)+" topic ");
        m_layout->addWidget(m_titleLabels[i],1,i);// Give it to the layout manager , The default is to occupy one row and one column 

        // Judgment questions 
        if(i==9){
            m_radioA=new QRadioButton(this);
            m_radioB=new QRadioButton(this);

            m_radioA->setText(" correct ");
            m_radioB->setText(" error ");

            m_layout->addWidget(m_radioA,2,9);
            m_layout->addWidget(m_radioB,3,9);

            // True or false button grouping 
            m_btnGroups[8]=new QButtonGroup(this);
            m_btnGroups[8]->addButton(m_radioA);
            m_btnGroups[8]->addButton(m_radioB);
        }
        if(i<8){
            // Radio button grouping 
            m_btnGroups[i]=new QButtonGroup(this);
        }
        // choice question 
        for(int j=0;j<4;++j){
            if(i==8){
                // Multiple choice 
                m_checkBtns[j]=new QCheckBox(this);
                m_checkBtns[j]->setText(strList.at(j));
                m_layout->addWidget(m_checkBtns[j],2+j,8);
            }else if(i<8){
                // Single topic selection 
                m_radioBtns[i*4+j]=new QRadioButton(this);
                m_radioBtns[i*4+j]->setText(strList.at(j));
                m_layout->addWidget(m_radioBtns[i*4+j],2+j,i);

                m_btnGroups[i]->addButton(m_radioBtns[i*4+j]);
            }
        }
        // Submit button 
        QPushButton*submitBtn=new QPushButton(this);
        submitBtn->setText(" Submit ");
        submitBtn->setFixedSize(100,35);
        m_layout->addWidget(submitBtn,6,9);
    }
}

3.4 Submit scores

First, connect the submit button to the signal slot

connect(submitBtn,SIGNAL(clicked(bool)),this,SLOT(getScore()));

Judge whether all the questions are completed before calculating the score , Then calculate the score according to the read answer

bool ExamDialog::hasNoSelect()
{
    int radioSelects=0;
    // Count the number of single choice questions completed 
    for(int i=0;i<8;++i){
        if(m_btnGroups[i]->checkedButton()){
            radioSelects++;
        }
    }
    // Judge whether the single choice questions are all completed 
    if(radioSelects!=8){
        return true;
    }
    // Count the number of multiple topic choices 
    int checkSelect=0;
    for(int i=0;i<4;++i){
        if(m_checkBtns[i]->isChecked()){
            checkSelect++;
        }
    }
    // Multiple choice questions are not selected or only one is not completed 
    if(checkSelect==0||checkSelect==1){
        return true;
    }
    // Judgment questions 
    if(!m_radioA->isChecked()&&!m_radioB->isChecked()){
        return true;
    }
    return false;
}

void ExamDialog::getScore()
{
    if(hasNoSelect()){
        // There are unfinished questions 
        QMessageBox::information(this," Tips "," You have unfinished questions ！ Please complete the exam "," yes ");
        return ;
    }else{
        // Begin to divide 
        int scores =0;
        for(int i=0;i<10;++i){
            // Single choice questions are divided 
            if(i<8){
                // Judge whether the selected button is consistent with the answer 
                if(m_btnGroups[i]->checkedButton()->text()==m_answerList.at(i)){
                    scores+=10;
                }
            }
            // Multiple choice questions are divided 
            if(i==8){
                QString answer=m_answerList.at(i);// Get answers to multiple topics 
                bool hasA=false;
                bool hasB=false;
                bool hasC=false;
                bool hasD=false;
                hasA=answer.contains("A");
                hasB=answer.contains("B");
                hasC=answer.contains("C");
                hasD=answer.contains("D");

                bool checkA=m_checkBtns[0]->checkState();
                bool checkB=m_checkBtns[1]->checkState();
                bool checkC=m_checkBtns[2]->checkState();
                bool checkD=m_checkBtns[3]->checkState();
                if(hasA!=checkA||hasB!=checkB||hasC!=checkC||hasD!=checkD){
                    // The answer is inconsistent 
                    continue;
                }else{
                    scores+=10;
                }
            }
            // The judgement questions are divided into 
            if(i==9){
                if(m_btnGroups[8]->checkedButton()->text()==m_answerList.at(i)){
                    scores+=10;
                }
            }
        }
        int res = QMessageBox::information(this," Tips "," Your score is ："+QString::number(scores)+" branch . Whether to retake the exam ？",QMessageBox::Yes|QMessageBox::No);
        if(res==QMessageBox::Yes){
            // Retest 
            return;
        }else{
            // Don't want to retake the exam 
            close();
        }
    }
}

3.5 Window interaction

Realize the connection between login window and examination window

When the user logs in successfully, it passes done Function to send a Accepted, Send a when the user clicks cancel Rejected, Then judge in the main function

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    LoginDialog loginDialog;
    int res = loginDialog.exec();   // Run in modal mode 
    if(res==QDialog::Accepted){
        ExamDialog examDialog;
        return a.exec();
    }else{
        return 0;
    }
    return a.exec();
}