Qlabel 每五个一换行 并、号分割
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
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 hobbieshobbiesLayout = 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 hobbiesQLayoutItem* item;while ((item = hobbiesLayout->takeAt(0)) != nullptr) {delete item->widget();delete item;}// Add the new hobbiesint row = 0, col = 0;for (const QString& hobby : hobbies) {QLabel* hobbyLabel = new QLabel(hobby);hobbyLabel->setAlignment(Qt::AlignCenter);hobbyLabel->setFixedSize(100, 30); // Fix label sizehobbiesLayout->addWidget(hobbyLabel, row, col);++col;if (col == 5) {col = 0;++row;}}
}
添加滑动条
// Right: Scroll area for hobbies and other widgetshobbiesWidget->setLayout(new QGridLayout());hobbiesScrollArea->setWidget(hobbiesWidget);hobbiesScrollArea->setWidgetResizable(true);hobbiesScrollArea->setMaximumHeight(40); // Minimum heighthobbiesScrollArea->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 itemswhile (QLayoutItem* item = layout->takeAt(0)) {delete item->widget();delete item;}// Add hobbies to grid layoutint 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();
}
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_OBJECTpublic: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 StackedWidgetstackedWidget = 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_Hmainwindow.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IDconst 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();}
}···