Qt 自定义登录界面(屏蔽键盘事件、设置窗口可拖动)

太过爱你忘了你带给我的痛 2023-06-19 05:29 3阅读 0赞

# **1.自定义一个简单登录界面** #

** 1.1首先设置窗口无边框**

// 设置当前窗口无标题栏
    setWindowFlags(Qt::FramelessWindowHint);

**1.2在登录过程中，按下Esc键会关闭窗口，所以需要屏蔽键盘Esc键**

void Dialog::keyPressEvent(QKeyEvent *event)
    {
        if (event->key() == Qt::Key_Escape)
        {
            return;
        }
        QDialog::keyPressEvent(event);
    }

**1.3设置登录密码格式**

//设置密码隐藏
    ui->lineEditPasswd->setEchoMode(QLineEdit::Password);
    
    //设置只能输入数字和英文,使用正则表达式
    QRegExpValidator *pRevalidotor = new QRegExpValidator(QRegExp("[A-Za-z0-9]{25}"), this);
    ui->lineEditPasswd->setValidator(pRevalidotor);
    
    //设置输入密码屏蔽输入法
    ui->lineEditPasswd->setAttribute(Qt::WA_InputMethodEnabled, false);

**1.4设置鼠标按住窗口顶部能够拖动，需要重写鼠标事件**

void Dialog::mousePressEvent(QMouseEvent *event)
    {
        if (event->button() == Qt::RightButton)
        {
            m_bMousePress = false;
            return QWidget::mousePressEvent(event);
        }
        else if (event->button() == Qt::LeftButton)
        {
            // 只有在标题栏区域内按下鼠标左键才可以进行拖动操作
            if (ui->frame->geometry().contains(event->pos()))
            {
                m_bMousePress = true;
    
            }
        }
        m_Move_point = event->globalPos() - pos();
        return QWidget::mousePressEvent(event);
    }
    
    
    void Dialog::mouseReleaseEvent(QMouseEvent *event)
    {
        m_bMousePress = false;
        QApplication::setOverrideCursor(Qt::ArrowCursor);
        return QWidget::mouseReleaseEvent(event);
    }
    
    
    void Dialog::mouseMoveEvent(QMouseEvent *event)
    {
        if (m_bMousePress)
        {
            QApplication::setOverrideCursor(Qt::SizeAllCursor);
            QPoint move_pos = event->globalPos();
            move(move_pos - m_Move_point);
        }
        return QWidget::mouseMoveEvent(event);
    }

#  2.运行截图 #

![20191204184235911.gif][]

# **3.完整代码 ** #

//.h文件
    
    #ifndef DIALOG_H
    #define DIALOG_H
    
    #include <QDialog>
    
    namespace Ui {
    class Dialog;
    }
    
    class Dialog : public QDialog
    {
        Q_OBJECT
    
    public:
        explicit Dialog(QWidget *parent = 0);
        ~Dialog();
    
    protected:
        void keyPressEvent(QKeyEvent *event);
        void mousePressEvent(QMouseEvent *event);
        void mouseReleaseEvent(QMouseEvent *event);
        void mouseMoveEvent(QMouseEvent *event);
    
    private Q_SLOTS:
        void slotCheckBoxState(bool);
        void slotMin();
        void slotClose();
    
    private:
        Ui::Dialog *ui;
    
    private:
        bool m_bMousePress = false;         //标记鼠标状态：按下；未按下
        QPoint m_Move_point;                 //标记鼠标移动距离
    };
    
    #endif // DIALOG_H
    
    
    //.cpp文件
    #include "dialog.h"
    #include "ui_dialog.h"
    #include <QRegExpValidator>
    
    Dialog::Dialog(QWidget *parent) :
        QDialog(parent),
        ui(new Ui::Dialog)
    {
        ui->setupUi(this);
    
        // 设置当前窗口无标题栏
        setWindowFlags(Qt::FramelessWindowHint);
    
        setAttribute(Qt::WA_DeleteOnClose);
    
        //设置密码隐藏
        ui->lineEditPasswd->setEchoMode(QLineEdit::Password);
    
        //设置只能输入数字和英文,使用正则表达式
        QRegExpValidator *pRevalidotor = new QRegExpValidator(QRegExp("[A-Za-z0-9]{25}"), this);
        ui->lineEditPasswd->setValidator(pRevalidotor);
        ui->lineEditPasswd->setAttribute(Qt::WA_InputMethodEnabled, false);
    
        connect(ui->checkBox,&QCheckBox::toggled,this,&Dialog::slotCheckBoxState);
        connect(ui->btnMin,&QPushButton::clicked,this,&Dialog::slotMin);
        connect(ui->btnClose,&QPushButton::clicked,this,&Dialog::slotClose);
    }
    
    Dialog::~Dialog()
    {
        delete ui;
    }
    
    void Dialog::keyPressEvent(QKeyEvent *event)
    {
        if (event->key() == Qt::Key_Escape)
        {
            return;
        }
        QDialog::keyPressEvent(event);
    }
    
    
    void Dialog::mousePressEvent(QMouseEvent *event)
    {
        if (event->button() == Qt::RightButton)
        {
            m_bMousePress = false;
            return QWidget::mousePressEvent(event);
        }
        else if (event->button() == Qt::LeftButton)
        {
            // 只有在标题栏区域内按下鼠标左键才可以进行拖动操作
            if (ui->frame->geometry().contains(event->pos()))
            {
                m_bMousePress = true;
    
            }
        }
        m_Move_point = event->globalPos() - pos();
        return QWidget::mousePressEvent(event);
    }
    
    
    void Dialog::mouseReleaseEvent(QMouseEvent *event)
    {
        m_bMousePress = false;
        QApplication::setOverrideCursor(Qt::ArrowCursor);
        return QWidget::mouseReleaseEvent(event);
    }
    
    
    void Dialog::mouseMoveEvent(QMouseEvent *event)
    {
        if (m_bMousePress)
        {
            QApplication::setOverrideCursor(Qt::SizeAllCursor);
            QPoint move_pos = event->globalPos();
            move(move_pos - m_Move_point);
        }
        return QWidget::mouseMoveEvent(event);
    }
    
    
    void Dialog::slotCheckBoxState(bool check)
    {
        if(check)
        {
            ui->lineEditPasswd->setEchoMode(QLineEdit::Normal);
        }
        else
        {
            ui->lineEditPasswd->setEchoMode(QLineEdit::Password);
        }
    }
    
    void Dialog::slotMin()
    {
        this->showMinimized();
    }
    
    void Dialog::slotClose()
    {
        this->close();
    }

[20191204184235911.gif]: https://img-blog.csdnimg.cn/20191204184235911.gif