QT实现简单验证的页面跳转

来源：互联网发布：不用网络的跑酷游戏编辑：程序博客网时间：2024/05/29 14:01

LINUX爱好者！该文章的项目是基于LINUX下的QT。

转载请标明出处！

QT实现简单的页面跳转

以登录功能为例，本项目将默认类作为主界面（main_widgt），创建的新类（login_widget）作登录界面。

#ifndef LOGIN_WIDGET_H
#define LOGIN_WIDGET_H

#include <QObject>
#include <QWidget>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QVBoxLayout>
#include <QMessageBox>

class login_widget : public QWidget
{
    Q_OBJECT

public:
    login_widget();

    QLabel *userLabel;
    QLabel *pswLabel;
    QLineEdit *luserEdit;
    QLineEdit *pswEdit;
    QPushButton *loginBtn;
    QVBoxLayout *layout;

    QWidget *mainwidget;

private slots:
    void on_lloginBtn_Clicked();
};

#endif // LOGIN_WIDGET_H

#include "login_widget.h"
#include "main_widget.h"

login_widget::login_widget()
{
    userLabel = new QLabel;
    userLabel->setText(tr("username"));
    luserEdit = new QLineEdit;
    pswLabel = new QLabel;
    pswLabel->setText(tr("password"));
    pswEdit = new QLineEdit;
    //pswEdit->setEchoMode(QLineEdit::Password);//输入密码时显示*
    loginBtn = new QPushButton(tr("Login"));
    connect(loginBtn,SIGNAL(clicked(bool)),this,SLOT(on_lloginBtn_Clicked()));
    ......
}

void login_widget::on_lloginBtn_Clicked()
{
    if((this->luserEdit->text().trimmed()==tr("a"))&&(this->pswEdit->text().trimmed()==tr("a")))
    {
        this->hide();//密码正确登陆成功跳到主页面
        mainwidget = new main_widget;
        mainwidget->show();
    }
    else if (this->luserEdit->text().trimmed()==NULL)
    {
        QMessageBox::warning(this,tr("ERROR"),tr("please input username!"),QMessageBox::Yes);
        this->luserEdit->setFocus();//鼠标回到用户名栏
    }
    else
    {
        QMessageBox::warning(this,tr("WARNING"),tr("username or password wrong!"),QMessageBox::Yes);
        this->pswEdit->clear();//清除密码
        this->pswEdit->setFocus();//鼠标回到密码栏
    }
}

void login_widget::on_lregisterBtn_Clicked()
{
    this->hide();
    registerwidget = new register_widget;
    registerwidget->show();
}

#ifndef MAIN_WIDGET_H
#define MAIN_WIDGET_H
#include <QWidget>

class main_widget : public QWidget
{
    Q_OBJECT

public:
    main_widget(QWidget *parent = 0);
    ~main_widget();

    QLabel *welcomeLabel;
    QVBoxLayout *layout;
};

#endif // MAIN_WIDGET_H

#include "main_widget.h"
#include "login_widget.h"

#include <QtSql>//数据库

main_widget::main_widget(QWidget *parent)
    : QWidget(parent)
{
    welcomeLabel = new QLabel;
    welcomeLabel->setText(tr("welcome to back!"));
    ......
}

main_widget::~main_widget()
{

}

#include "login_widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    login_widget w;//设置启动的默认窗口
    w.show();

    return a.exec();
}

成功！

如有疑问请提出一起探讨，谢谢！

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