day11 coding Qt案例: 餐馆点餐

day11/qtdemo2/custom.cpp

@@ -0,0 +1,46 @@
+#include "custom.h"
+
+Custom::Custom(QWidget *parent)
+    : QWidget(parent)
+{
+    // 初始化窗口的控件
+    nameEdit = new QLineEdit(this);
+    nameEdit->resize(200,40);
+    nameEdit->move(10,10);
+
+    nEdit = new QLineEdit(this);
+    nEdit->resize(100,40);
+    nEdit->move(10,60);
+
+    toOrderBtn = new QPushButton("下单",this);
+    toOrderBtn->resize(80,40);
+    toOrderBtn->move(10,110);
+
+    eatStateLable = new QLabel("未开吃",this);
+    eatStateLable->resize(100,40);
+    eatStateLable->move(10,160);
+
+    // 设置按钮的点击事件的处理函数
+    connect(toOrderBtn,&QPushButton::clicked,this,&Custom::toOrderHandle);
+}
+
+void Custom::toOrderHandle()
+{
+    eatStateLable->setText("等待上菜……");
+    // 下单按钮被点击了
+    qDebug() << "准备下单了";
+    qDebug() << "你的菜品: "<< nameEdit->text() << ", 数量:" << nEdit->text();
+
+    // 向店家发送信号，信号中包含菜品名和数量
+    emit toOrderSignal(nameEdit->text(), nEdit->text().toInt());
+}
+
+void Custom::okOrderHandle()
+{
+    eatStateLable->setText(nameEdit->text()+"开吃……");
+}
+
+Custom::~Custom()
+{
+}
+

day11/qtdemo2/custom.h

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+#ifndef CUSTOM_H
+#define CUSTOM_H
+
+#include <QWidget>
+#include <QLineEdit>
+#include <QPushButton>
+#include <QLabel>
+#include <QDebug>
+
+class Custom : public QWidget
+{
+    Q_OBJECT
+
+private:
+    QLineEdit *nameEdit; // 菜品
+    QLineEdit *nEdit; // 数量
+    QPushButton *toOrderBtn; // 下单
+    QLabel *eatStateLable; // 开吃状态
+
+public slots:
+    void toOrderHandle(); // 处理按钮的点击事件
+    void okOrderHandle(); // 店家上菜信号的处理函数
+
+
+signals:
+    void toOrderSignal(QString name,int n);
+
+public:
+    Custom(QWidget *parent = nullptr);
+    ~Custom();
+};
+#endif // CUSTOM_H

day11/qtdemo2/main.cpp

@@ -0,0 +1,26 @@
+#include "custom.h"
+#include "restaurant.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    Custom c;
+    c.setWindowTitle("点餐系统");
+    c.resize(800,600);
+
+    // 创建店类的对象
+    Restaurant r;
+
+    // 绑定客户下单信号处理函数
+    void (Custom:: *toOrder)(QString, int) = &Custom::toOrderSignal;
+    void (Restaurant:: *receiveOrder)(QString, int) = &Restaurant::receiveOrder;
+    QObject::connect(&c,toOrder,&r,receiveOrder);
+
+    // 绑定店家上菜信号和客户的槽函数
+    QObject::connect(&r,&Restaurant::okOrder,&c,&Custom::okOrderHandle);
+
+    c.show();
+    return a.exec();
+}

day11/qtdemo2/qtdemo2.pro

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+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 \
+    custom.cpp \
+    restaurant.cpp
+
+HEADERS += \
+    custom.h \
+    restaurant.h
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

day11/qtdemo2/restaurant.cpp

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+#include "restaurant.h"
+
+Restaurant::Restaurant(QWidget *parent) : QWidget(parent)
+{
+
+}
+
+void Restaurant::receiveOrder(QString name, int n)
+{
+    qDebug() << "店家已接收到菜单: " << name << ", 数量: " << n;
+
+    // 等待 10 秒
+    // QThread::msleep(10*1000); // 单位毫秒，UI阻塞
+
+    // 创建定时器，UI非阻塞
+    QTimer *timer = new QTimer();
+    // 绑定定时器的超时信号与 Lambda 表达式的匿名处理函数
+    QTimer::connect(timer,&QTimer::timeout,[&](){
+       qDebug() << "完成订单，上菜";
+       // 发送上菜的信号
+       emit okOrder();
+    });
+    timer->setSingleShot(true); // 单次使用
+    timer->start(10*1000); // 单位: 毫秒
+}

day11/qtdemo2/restaurant.h

@@ -0,0 +1,24 @@
+#ifndef RESTAURANT_H
+#define RESTAURANT_H
+
+#include <QWidget>
+#include <QTimer>
+#include <QDebug>
+#include "custom.h"
+
+class Restaurant : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit Restaurant(QWidget *parent = nullptr);
+
+public slots:
+    // 接单的处理槽函数
+    void receiveOrder(QString name, int n);
+
+signals:
+    void okOrder(); // 完成菜品
+
+};
+
+#endif // RESTAURANT_H