Qt 12.28 day3 - 技术栈

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

cpp 复制代码

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += 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 6.0.0

SOURCES += \
    main.cpp \
    second.cpp \
    widget.cpp

HEADERS += \
    second.h \
    widget.h

FORMS += \
    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 += target

RESOURCES += \
    ppppp.qrc

widget.h

cpp 复制代码

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>
#include <QMessageBox>


QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    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

cpp 复制代码

#ifndef SECOND_H
#define SECOND_H

#include <QWidget>

namespace Ui {
class Second;
}

class Second : public QWidget
{
    Q_OBJECT

public:
    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

cpp 复制代码

#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

cpp 复制代码

#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

cpp 复制代码

#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();
}