QT 4-8密码框

widget.h

#ifndef WIDGET_H

#define WIDGET_H

#include <QWidget>

namespace Ui {

class Widget;

}

class Widget : public QWidget

{

    Q_OBJECT

public:

    explicit Widget(QWidget *parent = 0);

    ~Widget();

private slots:

    void on_checkBox_clicked();

    void on_checkBox_2_clicked();

    void on_pushButton_clicked();

private:

    Ui::Widget *ui;

};

#endif // WIDGET_H

widget.cpp

#include "widget.h"

#include "ui_widget.h"

Widget::Widget(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Widget)

{

    ui->setupUi(this);

}

Widget::~Widget()

{

    delete ui;

}

void Widget::on_checkBox_clicked()

{

    if(ui->checkBox->isChecked())

    {

        ui->lineEdit->setReadOnly(true);

    }

    else

        ui->lineEdit->setReadOnly(false);

}

void Widget::on_checkBox_2_clicked()

{

    if(ui->checkBox_2->isChecked())

        ui->lineEdit->setEchoMode(QLineEdit::Password);

    else

        ui->lineEdit->setEchoMode(QLineEdit::Normal);

}

void Widget::on_pushButton_clicked()

{

    ui->label->setText(ui->lineEdit->text());

}

main.cpp

#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    Widget w;

    w.show();

    return a.exec();

}