作业：
1】 思维导图
2】 在登录界面的登录取消按钮进行以下设置：
使用手动连接，将登录框中的取消按钮使用qt4版本的连接到自定义的槽函数中，在自定义的槽函数中调用关闭函数
将登录按钮使用qt5版本的连接到自定义的槽函数中，在槽函数中判断ui界面上输入的账号是否为"admin"，密码是否为"123456",如果账号密码匹配成功，则输出“登录成功”，并关闭该界面，弹出另一个界面。如果匹配失败，则输出登录失败，并将密码框中的内容清空
3】 自己完成一个使用qss的登陆窗口界面【资源文件的添加、qss语法】。
已更新12.29题目为新增功能代码
untitled.pro
QT += core guigreaterThan(QT_MAJOR_VERSION, 4): QT += widgetsCONFIG += c++11# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp \second.cpp \widget.cppHEADERS += \second.h \widget.hFORMS += \second.ui \widget.ui# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += targetRESOURCES += \ppppp.qrc
widget.h
#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QPushButton>
#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_jump();//第一个界面准备的信号private slots:void on_pushButton_2_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声明private:Ui::Second *ui;
};#endif // SECOND_H
main.cpp
#include "widget.h"
#include "second.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();//实例化第二界面Second s;QObject::connect(&w,&Widget::my_jump,&s,&Second::jump_slot);return a.exec();
}
widget.cpp
#include "widget.h"
#include "ui_widget.h"
#include <QDebug>
Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget){ui->setupUi(this);//去掉标题，纯净模式this->setWindowFlag(Qt::FramelessWindowHint);//去掉空白部分this->setAttribute(Qt::WA_TranslucentBackground);connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(my_slot()));
}Widget::~Widget()
{delete ui;
}
//基于静态成员函数版本
void Widget::on_pushButton_2_clicked()
{int ret = QMessageBox::question(this,"问题对话框","您是否确认要退出登录?",QMessageBox::Yes|QMessageBox::No);if(ret==QMessageBox::Yes){this->close();}else{}
}void Widget::on_pushButton_clicked()
{if(ui->lineEdit->text()=="admin"&&ui->lineEdit_2->text()=="123456"){//基于基本属性版本QMessageBox msg(QMessageBox::Information,"信息对话框","登录成功",QMessageBox::Ok,this);//调用exec()弹出信息对话框int ret = msg.exec();//if(ret == QMessageBox::Ok){this->close();emit my_jump();}}else{//基于静态成员函数版本int ret = QMessageBox::critical(this,"错误对话框","账号和密码不匹配，是否重新登录",QMessageBox::Yes|QMessageBox::No,QMessageBox::Yes);if(ret == QMessageBox::Yes){ui->lineEdit->clear();ui->lineEdit_2->clear();}else{this->close();}qDebug()<<"登录失败";}
}
second.cpp
#include "second.h"
#include "ui_second.h"Second::Second(QWidget *parent) :QWidget(parent),ui(new Ui::Second)
{ui->setupUi(this);//去掉标题，纯净模式this->setWindowFlag(Qt::FramelessWindowHint);//去掉空白部分this->setAttribute(Qt::WA_TranslucentBackground);
}Second::~Second()
{delete ui;
}//第二个界面来准备的槽函数实现
void Second::jump_slot()
{//显示this->show();
}
