QListWidget

main.cpp

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#include <QApplication>
#include <QWidget>
#include <QListWidget>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPushButton>
#include <QLabel>
#include <QMessageBox>

void setupListWidgetDemo(QWidget *parent) {
    QVBoxLayout *mainLayout = new QVBoxLayout(parent);

    // --- 1. 创建列表控件 ---
    QListWidget *listWidget = new QListWidget(parent);

    // 添加简单的文字项
    listWidget->addItem("C++ 基础教程");
    listWidget->addItem("Qt 控件指南");

    // 添加带图标的项（使用 QListWidgetItem 可以设置更多细节）
    QListWidgetItem *itemWithIcon = new QListWidgetItem(
        parent->style()->standardIcon(QStyle::SP_ComputerIcon), "我的电脑"
        );
    listWidget->addItem(itemWithIcon);

    // 允许按住 Ctrl 进行多选
    listWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);

    // --- 2. 交互按钮 ---
    QHBoxLayout *btnLayout = new QHBoxLayout();
    QPushButton *btnAdd = new QPushButton("添加新项");
    QPushButton *btnDel = new QPushButton("删除选中");
    btnLayout->addWidget(btnAdd);
    btnLayout->addWidget(btnDel);

    // --- 3. 信号处理：双击某一项 ---
    QObject::connect(listWidget, &QListWidget::itemDoubleClicked, [](QListWidgetItem *item) {
        QMessageBox::information(nullptr, "提示", "你双击了：" + item->text());
    });

    // --- 4. 逻辑：动态添加 ---
    QObject::connect(btnAdd, &QPushButton::clicked, [listWidget]() {
        static int count = 1;
        listWidget->addItem(QString("新任务 %1").arg(count++));
    });

    // --- 5. 逻辑：删除选中 ---
    QObject::connect(btnDel, &QPushButton::clicked, [listWidget]() {
        // 获取所有选中的项（因为开启了多选）
        QList<QListWidgetItem*> items = listWidget->selectedItems();
        for (QListWidgetItem* item : items) {
            delete listWidget->takeItem(listWidget->row(item));
        }
    });

    mainLayout->addWidget(new QLabel("任务清单（双击查看详情）："));
    mainLayout->addWidget(listWidget);
    mainLayout->addLayout(btnLayout);
}

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    QWidget w;
    w.setWindowTitle("QListWidget 列表演示");
    w.resize(300, 400);
    setupListWidgetDemo(&w);
    w.show();
    return a.exec();
}