Qt creator day3练习

2、升级优化自己应用程序的登录界面。

要求： 1. qss实现

2. 需要有图层的叠加 （QFrame）

3. 设置纯净窗口后，有关闭等窗口功能。

4. 如果账号密码正确，则实现登录界面关闭，另一个应用界面显示。

widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QMessageBox>QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();
signals:void my_signal();  //信号函数的声明void my_jump();  //第一个界面的跳转信号private slots:void on_pushButton_2_clicked();void on_pushButton_3_clicked();void on_pushButton_clicked();private:Ui::Widget *ui;
};
#endif // WIDGET_H

second.h

#ifndef SECOND_H
#define SECOND_H#include <QWidget>namespace Ui {
class Second;
}class Second : public QWidget
{Q_OBJECTpublic:explicit Second(QWidget *parent = nullptr);~Second();public slots:void jump_slot(); //第二个界面准备的槽函数private:Ui::Second *ui;
};#endif // SECOND_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);//将自定义的信号和Lambda表达式连接connect(this,&Widget::my_signal,[=](){//ui->resize(ui->width()+10,ui->height()+10);});//去掉头部this->setWindowFlag(Qt::FramelessWindowHint);//去掉空白部分this->setAttribute(Qt::WA_TranslucentBackground);connect(ui->lineEdit_2,SIGNAL(returnPressed()),ui->pushButton  //回车键登录,SIGNAL(clicked()),Qt::UniqueConnection);}Widget::~Widget()
{delete ui;
}void Widget::on_pushButton_2_clicked()
{this->close();
}void Widget::on_pushButton_3_clicked()
{}void Widget::on_pushButton_clicked()
{QMessageBox *box = new QMessageBox();  //实例化一个box，用来弹出消息box->setWindowTitle("提示");if(QString(ui->lineEdit->text()) == "admin" && QString(ui->lineEdit_2->text()) == "123456"){box->setText("登录成功^_^");box->show();box->exec();this->close();emit my_jump(); // 触发信号}else{box->setText("账号密码错误");box->show();  //提示box->exec();  //等待用户响应ui->lineEdit->setText("");ui->lineEdit_2->setText("");}
}

second.cpp

#include "second.h"
#include "ui_second.h"Second::Second(QWidget *parent) :QWidget(parent),ui(new Ui::Second)
{ui->setupUi(this);
}Second::~Second()
{delete ui;
}void Second::jump_slot()
{//显示this->show();
}

main.cpp

#include "widget.h"
#include "second.h"  //包含第二个头文件#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();Second s; //实例化第二个界面QObject::connect(&w, &Widget::my_jump, &s, &Second::jump_slot);return a.exec();
}