Qlabel 每五个一换行 并、号分割

于 2025-02-11 23:09:51 发布
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学习点

Qlabel 每五个一换行 并、号分割

QString MainWindow::formatHobbies(const std::set<QString>& hobbies) {
    QString formattedHobbies;
    int count = 0;

    for (const QString& hobby : hobbies) {
        if (count > 0 && count % 5 == 0)
            formattedHobbies += "\n"; // 每 5 个换行
        formattedHobbies += hobby + "、";
        ++count;
    }

    // 去掉最后一个 "、"
    if (!formattedHobbies.isEmpty())
        formattedHobbies.chop(1);

    return formattedHobbies;
}

效果图展示
在这里插入图片描述

Qlabel 每五个一换行 对齐排列

使用 QGridLayout 来排列爱好标签。
每行最多显示 5 个爱好，如果超过 5 个则换行。
使用 QLabel 来显示每个爱好，确保这些标签有一致的大小，并进行对齐

 QGridLayout* hobbiesLayout;
//添加到对应布局
 QWidget* rightPanel = new QWidget();
    QVBoxLayout* rightLayout = new QVBoxLayout(rightPanel);

    studentInfoLabel = new QLabel();
    rightLayout->addWidget(studentInfoLabel);

    // Create a layout for hobbies
    hobbiesLayout = new QGridLayout();
    hobbiesWidget = new QWidget();
    hobbiesWidget->setLayout(hobbiesLayout);
    rightLayout->addWidget(hobbiesWidget);

//具体实现
    void MainWindow::updateHobbiesLayout(const std::set<QString>& hobbies)
{
    // Clear the previous hobbies
    QLayoutItem* item;
    while ((item = hobbiesLayout->takeAt(0)) != nullptr) {
        delete item->widget();
        delete item;
    }

    // Add the new hobbies
    int row = 0, col = 0;
    for (const QString& hobby : hobbies) {
        QLabel* hobbyLabel = new QLabel(hobby);
        hobbyLabel->setAlignment(Qt::AlignCenter);
        hobbyLabel->setFixedSize(100, 30);  // Fix label size

        hobbiesLayout->addWidget(hobbyLabel, row, col);
        ++col;
        if (col == 5) {
            col = 0;
            ++row;
        }
    }
}

在这里插入图片描述

添加滑动条

// Right: Scroll area for hobbies and other widgets
    hobbiesWidget->setLayout(new QGridLayout());
    hobbiesScrollArea->setWidget(hobbiesWidget);
    hobbiesScrollArea->setWidgetResizable(true);
    hobbiesScrollArea->setMaximumHeight(40);  // Minimum height
    hobbiesScrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    hobbiesScrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);

rightLayout->addWidget(hobbiesScrollArea);
void MainWindow::updateHobbiesLayout(const std::set<QString>& hobbies) {
    QGridLayout* layout = qobject_cast<QGridLayout*>(hobbiesWidget->layout());
    if (!layout)
        return;

    // Clear existing layout items
    while (QLayoutItem* item = layout->takeAt(0)) {
        delete item->widget();
        delete item;
    }

    // Add hobbies to grid layout
    int row = 0, col = 0;
    for (const auto& hobby : hobbies) {
        QLabel* hobbyLabel = new QLabel(hobby);
        layout->addWidget(hobbyLabel, row, col);

        if (++col >= 5) {
            col = 0;
            ++row;
        }
    }

    hobbiesWidget->adjustSize();
}

在这里插入图片描述

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTreeWidget>
#include <QStackedWidget>
#include <QTableWidget>
#include <QLabel>
#include <QTabWidget>
#include <vector>
#include <set>

struct Student {
    QString id;
    QString name;
    QString className;
    int chinese;
    int math;
    int english;
    std::set<QString> hobbies;
    std::set<QString> honors;
};

struct Teacher {
    QString id;
    QString name;
    std::set<QString> subjects;  // 任课科目
    std::set<QString> classes;   // 所教班级
};

class MainWindow : public QMainWindow {
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);

private:
    void setupUI();
    void loadStudentData();
    void loadTeacherData();
    void displayStudentDetails(const Student &student);
    void displayTeacherDetails(const Teacher &teacher);
    QStringList setToQStringList(const std::set<QString> &set);
    // 左侧控件
    QTabWidget *tabWidget;
    QTreeWidget *studentTree;
    QTreeWidget *teacherTree;

    // 右侧控件
    QStackedWidget *stackedWidget;
    QWidget *studentPage;
    QWidget *teacherPage;

    // 学生界面
    QLabel *studentInfoLabel;
    QTableWidget *studentTable;

    // 教师界面
    QLabel *teacherInfoLabel;
    QTableWidget *teacherTable;

    // 数据
    std::vector<Student> students;
    std::vector<Teacher> teachers;

private slots:
    void onTabChanged(int index);
    void onTreeItemClicked(QTreeWidgetItem *item, int column);
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QHeaderView>
#include <QStringList>
#include <cstdlib>
#include <ctime>

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) {
    setupUI();
    loadStudentData();
    loadTeacherData();
}

void MainWindow::setupUI() {
    // 左侧 Tab 页
    tabWidget = new QTabWidget(this);
    studentTree = new QTreeWidget(tabWidget);
    teacherTree = new QTreeWidget(tabWidget);

    studentTree->setHeaderLabel("学生 ID");
    teacherTree->setHeaderLabel("教师 ID");

    tabWidget->addTab(studentTree, "学生信息");
    tabWidget->addTab(teacherTree, "教师信息");

    connect(tabWidget, &QTabWidget::currentChanged, this, &MainWindow::onTabChanged);
    connect(studentTree, &QTreeWidget::itemClicked, this, &MainWindow::onTreeItemClicked);
    connect(teacherTree, &QTreeWidget::itemClicked, this, &MainWindow::onTreeItemClicked);

    // 右侧 StackedWidget
    stackedWidget = new QStackedWidget(this);
    studentPage = new QWidget(stackedWidget);
    teacherPage = new QWidget(stackedWidget);

    stackedWidget->addWidget(studentPage);
    stackedWidget->addWidget(teacherPage);

    // 学生界面布局
    QVBoxLayout *studentLayout = new QVBoxLayout(studentPage);
    studentInfoLabel = new QLabel("学生详细信息", studentPage);
    studentTable = new QTableWidget(studentPage);
    studentTable->setColumnCount(3);
    studentTable->setHorizontalHeaderLabels({"语文", "数学", "英语"});
    studentTable->horizontalHeader()->setStretchLastSection(true);
    studentTable->verticalHeader()->setVisible(false);

    studentLayout->addWidget(studentInfoLabel);
    studentLayout->addWidget(studentTable);

    // 教师界面布局
    QVBoxLayout *teacherLayout = new QVBoxLayout(teacherPage);
    teacherInfoLabel = new QLabel("教师详细信息", teacherPage);
    teacherTable = new QTableWidget(teacherPage);
    teacherTable->setColumnCount(2);
    teacherTable->setHorizontalHeaderLabels({"班级", "学生数量"});
    teacherTable->horizontalHeader()->setStretchLastSection(true);
    teacherTable->verticalHeader()->setVisible(false);

    teacherLayout->addWidget(teacherInfoLabel);
    teacherLayout->addWidget(teacherTable);

    // 主布局
    QHBoxLayout *mainLayout = new QHBoxLayout();
    mainLayout->addWidget(tabWidget, 1);
    mainLayout->addWidget(stackedWidget, 3);

    QWidget *central = new QWidget(this);
    central->setLayout(mainLayout);
    setCentralWidget(central);
}

void MainWindow::loadStudentData() {
    srand(static_cast<unsigned>(time(nullptr)));

    for (int i = 1; i <= 30; ++i) {
        Student student;
        student.id = QString("ID%1").arg(i, 2, 10, QChar('0'));
        student.name = QString("学生%1").arg(i);
        student.className = QString("高三%1班").arg(i % 5 + 1);
        student.chinese = rand() % 40 + 60;
        student.math = rand() % 40 + 60;
        student.english = rand() % 40 + 60;
        student.hobbies = {"篮球", "足球", "画画", "写作", "音乐"};
        student.honors = {"优秀学生", "三好学生", "数学竞赛一等奖", "文艺活动积极分子"};

        students.push_back(student);

        QTreeWidgetItem *item = new QTreeWidgetItem(studentTree);
        item->setText(0, student.id);
    }
}

void MainWindow::loadTeacherData() {
    for (int i = 1; i <= 10; ++i) {
        Teacher teacher;
        teacher.id = QString("T%1").arg(i, 2, 10, QChar('0'));
        teacher.name = QString("教师%1").arg(i);
        teacher.subjects = {"语文", "数学", "英语"};
        teacher.classes = {"高一1班", "高二2班", "高三3班"};

        teachers.push_back(teacher);

        QTreeWidgetItem *item = new QTreeWidgetItem(teacherTree);
        item->setText(0, teacher.id);
    }
}

void MainWindow::onTabChanged(int index) {
    if (index == 0) {
        stackedWidget->setCurrentWidget(studentPage);
    } else if (index == 1) {
        stackedWidget->setCurrentWidget(teacherPage);
    }
}

void MainWindow::onTreeItemClicked(QTreeWidgetItem *item, int column) {
    QString id = item->text(column);

    if (tabWidget->currentIndex() == 0) {
        for (const auto &student : students) {
            if (student.id == id) {
                displayStudentDetails(student);
                break;
            }
        }
    } else if (tabWidget->currentIndex() == 1) {
        for (const auto &teacher : teachers) {
            if (teacher.id == id) {
                displayTeacherDetails(teacher);
                break;
            }
        }
    }
}

void MainWindow::displayStudentDetails(const Student &student) {
    //QString hobbies = QStringList(student.hobbies.begin(), student.hobbies.end()).join("、");
     QString hobbies = setToQStringList(student.hobbies).join("、");
    studentInfoLabel->setText(
        QString("学号: %1\n姓名: %2\n班级: %3\n爱好: %4")
            .arg(student.id)
            .arg(student.name)
            .arg(student.className)
            .arg(hobbies)
    );

    studentTable->setRowCount(1);
    studentTable->setItem(0, 0, new QTableWidgetItem(QString::number(student.chinese)));
    studentTable->setItem(0, 1, new QTableWidgetItem(QString::number(student.math)));
    studentTable->setItem(0, 2, new QTableWidgetItem(QString::number(student.english)));
}

void MainWindow::displayTeacherDetails(const Teacher &teacher) {
    QString subjects = setToQStringList(teacher.subjects).join("、");
    teacherInfoLabel->setText(
        QString("工号: %1\n姓名: %2\n任课科目: %3")
            .arg(teacher.id)
            .arg(teacher.name)
            .arg(subjects)
    );

    teacherTable->setRowCount(teacher.classes.size());
    int row = 0;
    for (const auto &cls : teacher.classes) {
        teacherTable->setItem(row, 0, new QTableWidgetItem(cls));
        teacherTable->setItem(row, 1, new QTableWidgetItem(QString::number(rand() % 50 + 10)));
        ++row;
    }
}

QStringList MainWindow::setToQStringList(const std::set<QString> &set)
{
    QStringList list;
       for (const auto &item : set) {
           list.append(item);
       }
       return list;
}


void MainWindow::displayStudentDetails(const Student &student) {
    // 上半部分Label显示信息
    QStringList hobbiesList;
    for (const auto &hobby : student.hobbies) {
        hobbiesList.append(hobby);
    }

    QString hobbies = hobbiesList.join("、");
    studentInfoLabel->setText(
        QString("学号: %1\n姓名: %2\n班级: %3\n爱好: %4")
            .arg(student.id)
            .arg(student.name)
            .arg(student.className)
            .arg(hobbies)
    );

    // 下半部分Table显示成绩
    studentTable->setRowCount(student.scores.size()); // 根据成绩数量设置行数
    for (int i = 0; i < student.scores.size(); ++i) {
        studentTable->setItem(i, 0, new QTableWidgetItem(QString::number(student.scores[i])));
    }
}

添加阴影效果
mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QPushButton>
#include <QLineEdit>
#include "loadingwidget.h"

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

protected:
    void resizeEvent(QResizeEvent *event) override;

private slots:
    void onStartLoading();
    void onStopLoading();

private:
    QPushButton *startButton;
    QPushButton *stopButton;

    QLineEdit * myLine;
    LoadingWidget *loadingWidget;
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "MainWindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), startButton(nullptr), stopButton(nullptr), loadingWidget(nullptr)
{
    resize(400, 300);

    // 创建加载遮罩
    loadingWidget = new LoadingWidget(this);
    loadingWidget->setGeometry(rect()); // 遮罩覆盖整个主窗口

    // 创建按钮
    startButton = new QPushButton("加载", this);
    startButton->setGeometry(50, 50, 100, 50);

    stopButton = new QPushButton("取消", this);
    stopButton->setGeometry(250, 50, 100, 50);

    myLine = new QLineEdit(this);
    myLine->setGeometry(250, 150, 100, 50);


    // 绑定信号与槽
    connect(startButton, &QPushButton::clicked, this, &MainWindow::onStartLoading);
    connect(stopButton, &QPushButton::clicked, this, &MainWindow::onStopLoading);
}

MainWindow::~MainWindow()
{
    delete loadingWidget;
}

void MainWindow::resizeEvent(QResizeEvent *event)
{
    QMainWindow::resizeEvent(event);
    if (loadingWidget) {
        loadingWidget->setGeometry(rect()); // 调整遮罩大小
    }
}

void MainWindow::onStartLoading()
{
    if (loadingWidget) {
        loadingWidget->start();
    }
}

void MainWindow::onStopLoading()
{
    if (loadingWidget) {
        loadingWidget->stop();
    }
}

loadingwidget.h

#ifndef LOADINGWIDGET_H
#define LOADINGWIDGET_H

#include <QWidget>
#include <QTimer>

class LoadingWidget : public QWidget
{
    Q_OBJECT
public:
    explicit LoadingWidget(QWidget *parent = nullptr);

protected:
    void paintEvent(QPaintEvent *event) override;
    void timerEvent(QTimerEvent *event) override;

public slots:
    void start();
    void stop();

private:
    int m_angle = 0;               // 当前旋转角度
    int m_timerID = -1;            // 定时器ID
    const int UPDATE_INTERVAL = 60; // 定时器间隔（毫秒）
};

#endif // LOADINGWIDGET_H

···
loadingwidget.
```cpp
#include "LoadingWidget.h"
#include <QPainter>

LoadingWidget::LoadingWidget(QWidget *parent)
    : QWidget(parent)
{
    setAttribute(Qt::WA_StyledBackground, true);
    setWindowFlags(Qt::FramelessWindowHint);  // 无边框窗口
    setAttribute(Qt::WA_TransparentForMouseEvents, true); // 鼠标事件穿透
    setStyleSheet("background-color: rgba(0, 0, 0, 127);"); // 半透明背景
}

void LoadingWidget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);

    int size = qMin(width(), height()) / 4;
    painter.translate(width() / 2, height() / 2);
    painter.rotate(m_angle);

    QPen pen;
    pen.setWidth(3);
    pen.setColor(Qt::white);
    painter.setPen(pen);
    painter.drawArc(-size, -size, size * 2, size * 2, 0, 120 * 16);
}

void LoadingWidget::timerEvent(QTimerEvent *event)
{
    m_angle = (m_angle + 10) % 360;
    update();
}

void LoadingWidget::start()
{
    if (m_timerID == -1) {
        m_timerID = startTimer(UPDATE_INTERVAL);
        show();
    }
}

void LoadingWidget::stop()
{
    if (m_timerID != -1) {
        killTimer(m_timerID);
        m_timerID = -1;
        hide();
    }
}

···
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