Partner_Project/src/ui/QuizFrame.java

package ui;

import model.Grade;
import model.Question;
import model.QuestionMaker;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.io.Serial;
import java.util.List;

/**
 * 答题界面
 * 显示题目和选项,接收用户答案
 */
public class QuizFrame extends JFrame {
    @Serial
    private static final long serialVersionUID = 1L;

    private final String email;
    private final Grade gradeType;
    private final List<Question> questions;
    private int currentIndex;
    private int correctCount;

    private JLabel questionLabel;
    private JLabel progressLabel;
    private JRadioButton[] optionButtons;
    private JButton submitButton;

    /**
     * 构造答题界面
     *
     * @param email 用户邮箱
     * @param gradeType 年级类型
     * @param questionCount 题目数量
     */
    public QuizFrame(String email, Grade gradeType, int questionCount) {
        this.email = email;
        this.gradeType = gradeType;
        this.currentIndex = 0;
        this.correctCount = 0;

        QuestionMaker generator = new QuestionMaker();
        this.questions = generator.makeQuestions(gradeType, questionCount, email);

        if (questions.isEmpty()) {
            JOptionPane.showMessageDialog(null,
                    "生成题目失败,返回主界面",
                    "错误",
                    JOptionPane.ERROR_MESSAGE);
            returnToGradeSelection();
            return;
        }

        setTitle("数学学习软件 - 答题");
        setSize(600, 450);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setResizable(false);

        JPanel mainPanel = new JPanel(new BorderLayout(10, 10));
        mainPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));

        progressLabel = new JLabel("", JLabel.CENTER);
        progressLabel.setFont(new Font("微软雅黑", Font.BOLD, 14));
        mainPanel.add(progressLabel, BorderLayout.NORTH);

        JPanel centerPanel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(10, 10, 10, 10);
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 2;

        questionLabel = new JLabel();
        questionLabel.setFont(new Font("微软雅黑", Font.PLAIN, 16));
        questionLabel.setBorder(BorderFactory.createEmptyBorder(10, 10, 20, 10));
        centerPanel.add(questionLabel, gbc);

        ButtonGroup optionGroup = new ButtonGroup();
        optionButtons = new JRadioButton[4];

        for (int i = 0; i < 4; i++) {
            optionButtons[i] = new JRadioButton();
            optionButtons[i].setFont(new Font("微软雅黑", Font.PLAIN, 14));
            optionGroup.add(optionButtons[i]);
            gbc.gridy = i + 1;
            centerPanel.add(optionButtons[i], gbc);
        }

        mainPanel.add(centerPanel, BorderLayout.CENTER);

        JPanel bottomPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        submitButton = new JButton("提交答案");
        submitButton.setPreferredSize(new Dimension(150, 35));
        submitButton.setFont(new Font("微软雅黑", Font.BOLD, 14));
        bottomPanel.add(submitButton);

        mainPanel.add(bottomPanel, BorderLayout.SOUTH);

        add(mainPanel);

        submitButton.addActionListener(e -> handleSubmit());

        displayQuestion();
    }

    /**
     * 显示当前题目
     */
    private void displayQuestion() {
        if (currentIndex >= questions.size()) {
            showResult();
            return;
        }

        Question question = questions.get(currentIndex);
        progressLabel.setText(String.format("第 %d/%d 题",
                currentIndex + 1, questions.size()));
        questionLabel.setText("<html><body style='width: 500px'>" +
                question.getQuestionText() + "</body></html>");

        String[] options = question.getOptions();
        for (int i = 0; i < 4; i++) {
            optionButtons[i].setText(options[i]);
            optionButtons[i].setSelected(false);
        }

        submitButton.setEnabled(true);
    }

    /**
     * 处理答案提交
     */
    private void handleSubmit() {
        int selectedIndex = -1;
        for (int i = 0; i < 4; i++) {
            if (optionButtons[i].isSelected()) {
                selectedIndex = i;
                break;
            }
        }

        if (selectedIndex == -1) {
            JOptionPane.showMessageDialog(this,
                    "请选择一个答案",
                    "提示",
                    JOptionPane.WARNING_MESSAGE);
            return;
        }

        Question question = questions.get(currentIndex);
        if (selectedIndex == question.getCorrectAnswer()) {
            correctCount++;
        }

        currentIndex++;
        displayQuestion();
    }

    /**
     * 显示答题结果
     */
    private void showResult() {
        double percentage = (double) correctCount / questions.size() * 100;
        int score = (int) percentage;

        ResultFrame resultFrame = new ResultFrame(
                email, gradeType, score, correctCount, questions.size());
        resultFrame.setVisible(true);
        this.dispose();
    }

    /**
     * 返回年级选择界面
     */
    private void returnToGradeSelection() {
        GradeSelectionFrame frame = new GradeSelectionFrame(email, gradeType);
        frame.setVisible(true);
        this.dispose();
    }
}