Qt实现删除布局与布局切换功能

// 假设有一个窗口widget，其布局为VBoxLayout
QVBoxLayout* oldLayout = qobject_cast<QVBoxLayout*>(widget->layout());

// 断开布局与父部件的关联
if (oldLayout) {
    // 遍历布局中的所有子部件，断开与布局的关联
    for (int i = 0; i < oldLayout->count(); ++i) {
        QWidget* child = oldLayout->itemAt(i)->widget();
        if (child) {
            oldLayout->removeWidget(child);
            child->setParent(nullptr); // 释放子部件的父引用
        }
    }

    // 删除布局
    delete oldLayout;
    widget->setLayout(nullptr); // 设置为空布局
}

// 创建主窗口
QWidget* mainWindow = new QWidget;
QStackedLayout* stackedLayout = new QStackedLayout(mainWindow);

// 创建第一个布局（Layout1）
QWidget* layout1 = new QWidget;
QHBoxLayout* layout1HBoxLayout = new QHBoxLayout(layout1);
layout1HBoxLayout->addWidget(new QPushButton("Button1"));
layout1HBoxLayout->addWidget(new QPushButton("Button2"));
stackedLayout->addWidget(layout1);

// 创建第二个布局（Layout2）
QWidget* layout2 = new QWidget;
QVBoxLayout* layout2VBoxLayout = new QVBoxLayout(layout2);
layout2VBoxLayout->addWidget(new QLineEdit("Input1"));
layout2VBoxLayout->addWidget(new QLineEdit("Input2"));
stackedLayout->addWidget(layout2);

// 切换到第二个布局
stackedLayout->setCurrentIndex(1);

// 显示窗口
mainWindow->show();

void switchLayout(QWidget* widget) {
    // 删除旧布局
    QLayout* oldLayout = widget->layout();
    if (oldLayout) {
        // 断开布局与子部件的关联
        for (int i = 0; i < oldLayout->count(); ++i) {
            QWidget* child = oldLayout->itemAt(i)->widget();
            if (child) {
                oldLayout->removeWidget(child);
                child->setParent(nullptr);
            }
        }
        delete oldLayout;
    }

    // 创建新布局
    QHBoxLayout* newLayout = new QHBoxLayout(widget);
    newLayout->addWidget(new QPushButton("New Button1"));
    newLayout->addWidget(new QPushButton("New Button2"));
}

#include <QWidget>
#include <QPushButton>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QStackedLayout>
#include <QDebug>

void deleteLayout(QWidget* widget) {
    QLayout* oldLayout = widget->layout();
    if (oldLayout) {
        // 断开布局与子部件的关联
        for (int i = 0; i < oldLayout->count(); ++i) {
            QWidget* child = oldLayout->itemAt(i)->widget();
            if (child) {
                oldLayout->removeWidget(child);
                child->setParent(nullptr);
            }
        }
        delete oldLayout;
        widget->setLayout(nullptr);
    }
}

void createNewLayout(QWidget* widget) {
    QHBoxLayout* newLayout = new QHBoxLayout(widget);
    newLayout->addWidget(new QPushButton("New Button1"));
    newLayout->addWidget(new QPushButton("New Button2"));
}

int main(int argc, char* argv[]) {
    QApplication app(argc, argv);

    QWidget* window = new QWidget;
    window->setWindowTitle("Qt Layout Switch Demo");
    window->resize(300, 200);

    // 创建初始布局
    QVBoxLayout* initialLayout = new QVBoxLayout(window);
    initialLayout->addWidget(new QPushButton("Button A"));
    initialLayout->addWidget(new QPushButton("Button B"));

    // 创建删除布局按钮
    QPushButton* deleteBtn = new QPushButton("Delete Layout");
    deleteBtn->setObjectName("deleteBtn");
    deleteBtn->setGeometry(20, 150, 120, 30);

    // 创建切换布局按钮
    QPushButton* switchBtn = new QPushButton("Switch Layout");
    switchBtn->setObjectName("switchBtn");
    switchBtn->setGeometry(140, 150, 120, 30);

    // 槽函数
    QObject::connect(deleteBtn, &QPushButton::clicked, [window]() {
        deleteLayout(window);
        qDebug() << "Layout deleted!";
    });

    QObject::connect(switchBtn, &QPushButton::clicked, [window]() {
        deleteLayout(window);
        createNewLayout(window);
        qDebug() << "Layout switched!";
    });

    window->show();
    return app.exec();
}