connect(ui->cancelButton, &QPushButton::clicked, this, &Widget::on_cancelButton_clicked);

SIGNAL(clicked()), this, SLOT(cancel()));

This code connects the "clicked()" signal of the "cancelButton" widget to the "cancel()" slot of the current object. This means that when the user clicks the "cancelButton", the "cancel()" function will be called.

相关问题

Drawer::Drawer(QWidget *parent, Qt::WindowFlags f) : QToolBox(parent, f) { setWindowTitle(tr("Myself QQ 2013")); setWindowIcon(QPixmap(":/image/qq.png")); // 添加登录界面 QDialog loginDialog(this); loginDialog.setWindowTitle(tr("登录")); QLabel* nameLabel = new QLabel(tr("用户名：")); QLineEdit* nameEdit = new QLineEdit; QLabel* pwdLabel = new QLabel(tr("密码：")); QLineEdit* pwdEdit = new QLineEdit; pwdEdit->setEchoMode(QLineEdit::Password); QPushButton* loginButton = new QPushButton(tr("登录")); QPushButton* cancelButton = new QPushButton(tr("取消")); QHBoxLayout* nameLayout = new QHBoxLayout; nameLayout->addWidget(nameLabel); nameLayout->addWidget(nameEdit); QHBoxLayout* pwdLayout = new QHBoxLayout; pwdLayout->addWidget(pwdLabel); pwdLayout->addWidget(pwdEdit); QVBoxLayout* buttonLayout = new QVBoxLayout; buttonLayout->addWidget(loginButton); buttonLayout->addWidget(cancelButton); QVBoxLayout* mainLayout = new QVBoxLayout(&loginDialog); mainLayout->addLayout(nameLayout); mainLayout->addLayout(pwdLayout); mainLayout->addLayout(buttonLayout); connect(loginButton, &QPushButton::clicked, [&](){ QString username = nameEdit->text(); QString password = pwdEdit->text(); if (username == "admin" && password == "123456") { loginDialog.close(); showChatWidget1(); } else { QMessageBox::warning(this, tr("错误"), tr("用户名或密码不正确！")); } }); connect(cancelButton, &QPushButton::clicked, [&](){ loginDialog.close(); close(); }); // 添加聊天窗口按钮 toolBtn1 = new QToolButton; toolBtn1->setText(tr("道枝小尧")); toolBtn1->setIcon(QPixmap(":/image/spqy.png")); toolBtn1->setIconSize(QPixmap(":/image/spqy.png").size()); toolBtn1->setAutoRaise(true); toolBtn1->setToolButtonStyle(Qt::ToolButtonTextBesideIcon); connect(toolBtn1, &QToolButton::clicked, this, &Drawer::showChatWidget1);UI界面怎么写

这是一个使用Qt框架编写的QQ聊天工具的UI界面。界面分为登录界面和聊天窗口界面，其中登录界面包含用户名、密码输入框和登录、取消按钮，聊天窗口界面包含多个聊天窗口按钮，用于切换不同的聊天窗口。

登录界面的UI布局包括用户名和密码输入框、登录和取消按钮，使用了QLabel、QLineEdit、QPushButton等控件，并使用QHBoxLayout、QVBoxLayout等布局管理器进行布局。聊天窗口界面的UI布局包括多个聊天窗口按钮，使用了QToolButton控件，并使用QHBoxLayout、QVBoxLayout等布局管理器进行布局。其中，聊天窗口按钮通过setIcon和setText设置了图标和文字，并使用了setAutoRaise和setToolButtonStyle设置了按钮的样式。在按钮的clicked信号中，使用了connect函数将按钮的点击事件与相应的槽函数进行了连接，实现了按钮的点击响应功能。

Drawer::Drawer(QWidget *parent, Qt::WindowFlags f) :QToolBox(parent, f) { setWindowTitle(tr("Myself QQ 2013")); //设置主窗口的标题 setWindowIcon(QPixmap(":/image/qq.png")); //设置主窗体标题栏图标 toolBtn1 = new QToolButton; toolBtn1->setText(tr("道枝小尧")); toolBtn1->setIcon(QPixmap(":/image/spqy.png")); toolBtn1->setIconSize(QPixmap(":/image/spqy.png").size()); toolBtn1->setAutoRaise(true); toolBtn1->setToolButtonStyle(Qt::ToolButtonTextBesideIcon); connect(toolBtn1, SIGNAL(clicked()), this, SLOT(showChatWidget1())); toolBtn2 = new QToolButton; toolBtn2->setText(tr("忆梦如澜")); toolBtn2->setIcon(QPixmap(":/image/ymrl.png")); toolBtn2->setIconSize(QPixmap(":/image/ymrl.png").size()); toolBtn2->setAutoRaise(true); toolBtn2->setToolButtonStyle(Qt::ToolButtonTextBesideIcon); connect(toolBtn2, SIGNAL(clicked()), this, SLOT(showChatWidget2()));在此基础上添加登录界面

在这段代码中，Drawer 类的构造函数已经实现了 QQ 聊天界面的主体部分，现在需要添加登录界面。可以在构造函数中添加一个 QDialog 对象，该对象包含用户名和密码的输入框以及登录和取消按钮。当用户点击登录按钮时，检查输入的用户名和密码是否正确，如果正确则关闭登录界面并显示 QQ 聊天窗口，否则弹出错误提示框。

以下是可能的实现方式：

Drawer::Drawer(QWidget *parent, Qt::WindowFlags f)
    : QToolBox(parent, f)
{
    setWindowTitle(tr("Myself QQ 2013"));
    setWindowIcon(QPixmap(":/image/qq.png"));

    // 添加登录界面
    QDialog loginDialog(this);
    loginDialog.setWindowTitle(tr("登录"));
    QLabel* nameLabel = new QLabel(tr("用户名："));
    QLineEdit* nameEdit = new QLineEdit;
    QLabel* pwdLabel = new QLabel(tr("密码："));
    QLineEdit* pwdEdit = new QLineEdit;
    pwdEdit->setEchoMode(QLineEdit::Password);
    QPushButton* loginButton = new QPushButton(tr("登录"));
    QPushButton* cancelButton = new QPushButton(tr("取消"));
    QHBoxLayout* nameLayout = new QHBoxLayout;
    nameLayout->addWidget(nameLabel);
    nameLayout->addWidget(nameEdit);
    QHBoxLayout* pwdLayout = new QHBoxLayout;
    pwdLayout->addWidget(pwdLabel);
    pwdLayout->addWidget(pwdEdit);
    QVBoxLayout* buttonLayout = new QVBoxLayout;
    buttonLayout->addWidget(loginButton);
    buttonLayout->addWidget(cancelButton);
    QVBoxLayout* mainLayout = new QVBoxLayout(&loginDialog);
    mainLayout->addLayout(nameLayout);
    mainLayout->addLayout(pwdLayout);
    mainLayout->addLayout(buttonLayout);
    connect(loginButton, &QPushButton::clicked, [&](){
        QString username = nameEdit->text();
        QString password = pwdEdit->text();
        if (username == "admin" && password == "123456") {
            loginDialog.close();
            showChatWidget1();
        } else {
            QMessageBox::warning(this, tr("错误"), tr("用户名或密码不正确！"));
        }
    });
    connect(cancelButton, &QPushButton::clicked, [&](){
        loginDialog.close();
        close();
    });

    // 添加聊天窗口按钮
    toolBtn1 = new QToolButton;
    toolBtn1->setText(tr("道枝小尧"));
    toolBtn1->setIcon(QPixmap(":/image/spqy.png"));
    toolBtn1->setIconSize(QPixmap(":/image/spqy.png").size());
    toolBtn1->setAutoRaise(true);
    toolBtn1->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
    connect(toolBtn1, &QToolButton::clicked, this, &Drawer::showChatWidget1);

    toolBtn2 = new QToolButton;
    toolBtn2->setText(tr("忆梦如澜"));
    toolBtn2->setIcon(QPixmap(":/image/ymrl.png"));
    toolBtn2->setIconSize(QPixmap(":/image/ymrl.png").size());
    toolBtn2->setAutoRaise(true);
    toolBtn2->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
    connect(toolBtn2, &QToolButton::clicked, this, &Drawer::showChatWidget2);
}

注意，这里使用了 C++11 中的 lambda 表达式来简化信号槽的连接，同时也使用了新的信号槽语法。