QT第一天案例综合

qtdemo01/.gitignore

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+# This file is used to ignore files which are generated
+# ----------------------------------------------------------------------------
+
+*~
+*.autosave
+*.a
+*.core
+*.moc
+*.o
+*.obj
+*.orig
+*.rej
+*.so
+*.so.*
+*_pch.h.cpp
+*_resource.rc
+*.qm
+.#*
+*.*#
+core
+!core/
+tags
+.DS_Store
+.directory
+*.debug
+Makefile*
+*.prl
+*.app
+moc_*.cpp
+ui_*.h
+qrc_*.cpp
+Thumbs.db
+*.res
+*.rc
+/.qmake.cache
+/.qmake.stash
+
+# qtcreator generated files
+*.pro.user*
+
+# xemacs temporary files
+*.flc
+
+# Vim temporary files
+.*.swp
+
+# Visual Studio generated files
+*.ib_pdb_index
+*.idb
+*.ilk
+*.pdb
+*.sln
+*.suo
+*.vcproj
+*vcproj.*.*.user
+*.ncb
+*.sdf
+*.opensdf
+*.vcxproj
+*vcxproj.*
+
+# MinGW generated files
+*.Debug
+*.Release
+
+# Python byte code
+*.pyc
+
+# Binaries
+# --------
+*.dll
+*.exe
+

qtdemo01/main.cpp

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+#include "widget.h"
+#include "mywidget2.h"
+#include "widget3.h"
+
+#include <QApplication>
+#include <QScreen>
+#include <QDebug>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    //    Widget w;
+
+    // 设置窗口的标题、初始大小、固定的最大宽和高
+    //    w.setWindowTitle("标题");
+    //    w.resize(1200,900);
+    //    w.setFixedSize(600,400);
+
+    // 获取主屏幕
+    //    QScreen *desktop = QApplication::primaryScreen();
+    //    QRect screenGeometry = desktop->geometry();
+    //    int screenWidth = screenGeometry.width();
+    //    int screenHeight = screenGeometry.height();
+    //    // 获取屏幕信息
+    //    qDebug() << "屏幕宽度：" << screenWidth;
+    //    qDebug() << "屏幕高度：" << screenHeight;
+
+
+//    MyWidget2 w2; // 修改为新增的 MyWidget2 类
+
+    Widget3 w3;
+
+    w3.show();
+    return a.exec();
+}

qtdemo01/mywidget2.cpp

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+#include "mywidget2.h"
+
+MyWidget2::MyWidget2(QWidget *parent) : QWidget(parent)
+{
+    // 设置窗口的大小
+    resize(800,640);
+    setWindowTitle("第二个窗口");
+
+    mBtn = new QPushButton("提取输入的内容",this);
+    //    mEdit = new QLineEdit(this);
+    mEdit = new QLineEdit;
+    mEdit->setParent(this);
+
+    mEdit->setFixedSize(200,50);
+    mEdit->move(10,10);
+    mBtn->setFixedSize(200,100);
+    mBtn->move(10,70);
+
+    connect(mBtn,&QPushButton::clicked,this,&MyWidget2::getText);
+}
+
+void MyWidget2::getText()
+{
+    // 绑定
+    qDebug()<<mEdit->text();
+}

qtdemo01/mywidget2.h

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+#ifndef MYWIDGET2_H
+#define MYWIDGET2_H
+
+#include <QWidget>
+#include <QPushButton>
+#include <QLineEdit> // 单行输入框
+#include <QDebug>
+
+class MyWidget2 : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit MyWidget2(QWidget *parent = nullptr);
+
+public:
+    void getText(); // 自定义成员函数
+
+private:
+    QPushButton *mBtn;
+    QLineEdit *mEdit;
+
+signals:
+
+
+};
+
+#endif // MYWIDGET2_H

qtdemo01/qtdemo01.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 \
+    mywidget2.cpp \
+    student.cpp \
+    teacher.cpp \
+    widget.cpp \
+    widget3.cpp
+
+HEADERS += \
+    mywidget2.h \
+    student.h \
+    teacher.h \
+    widget.h \
+    widget3.h
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target

qtdemo01/student.cpp

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+#include "student.h"
+
+Student::Student(QObject *parent) : QObject(parent)
+{
+
+}

qtdemo01/student.h

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+#ifndef STUDENT_H
+#define STUDENT_H
+
+#include <QObject>
+
+class Student : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Student(QObject *parent = nullptr);
+
+signals:
+    void sleep(); // 信号(函数)不需要实现
+    void sleep(const QString &msg,int n);
+
+};
+
+#endif // STUDENT_H

qtdemo01/teacher.cpp

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+#include "teacher.h"
+
+Teacher::Teacher(QObject *parent) : QObject(parent)
+{
+
+}
+
+void Teacher::wake_up(){
+    qDebug() << "请睡觉的学生站起来，出去跑两圈";
+}
+
+void Teacher::wake_up(const QString &msg)
+{
+    qDebug() << "学生因为 "<<msg<<" 原因上课睡觉了";
+}

qtdemo01/teacher.h

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+#ifndef TEACHER_H
+#define TEACHER_H
+
+#include <QObject>
+#include <QDebug>
+
+class Teacher : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Teacher(QObject *parent = nullptr);
+
+public slots:
+    void wake_up();
+    void wake_up(const QString &msg); // 信号带参数，处理的槽函数也要有参数，且类型保持一致
+
+};
+
+#endif // TEACHER_H

qtdemo01/widget.cpp

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+#include "widget.h"
+
+// : Qwidget(parent) 初始化列表，调用父类构造函数
+Widget::Widget(QWidget *parent)
+    : QWidget(parent)
+{
+    // 初始化设置窗口的标题、大小和固定
+    //    setWindowTitle("按钮板");
+    //    //    resize(400,300);
+    //    setFixedSize(400, 190);
+
+    // 添加按钮
+    // 不要将对象存在栈区，应该在堆区创建
+    //    QPushButton *btn = new QPushButton("点我啊",this);
+    //    QPushButton *btn = new QPushButton;
+    //    btn->setParent(this);
+    //    btn->setText("点一下");
+    //    btn->setFixedSize(200, 100);
+    //    btn->move(100, 50); // 向右移动 100, 向下移动 50
+
+    // 创建 9 个按钮，三行三列，每个按钮的大小为 120,50
+    // 每个按钮之间的间隔为 10
+    //    int w = 120, h = 50, space = 10;
+    //    QVector<QPushButton *> vbs; // 使用指针类型存储按钮
+    //    for (int i = 0; i < 3; i++)
+    //    { // 修改行范围
+    //        for (int j = 0; j < 3; j++)
+    //        { // 修改列范围
+    //            int btnNumber = i + j * 3 + 1;
+    //            // QPushButton *btn = new QPushButton(QString::number(btnNumber), this);
+    //            QPushButton *btn = new QPushButton;
+    //            btn->setText(QString::number(btnNumber));
+    //            btn->setParent(this);
+    //            btn->setFixedSize(w, h);
+    //            btn->move((space + w) * i + space, (space + h) * j + space);
+    //            vbs.append(btn); // 将按钮添加到向量中
+    //        }
+    //    }
+
+    // 方法二
+    //        int w=120, h =50,space=10;
+    //        QVector<QPushButton *> vbs;
+    //        for(int i=0;i <9; i++){
+    //            // QString::number(int) 将整数转化为QString字符串
+    //            QPushButton *btn=new QPushButton(QString::number(i+1), this);
+    //            btn->setFixedSize(w,h);
+
+    //            // 第一行
+    //            int row = i/3;
+    //            int col= i % 3;
+    //            btn->move((space+w)*col+space,
+    //                      (space+h)*row+space);
+    //            vbs.append(btn); // 将按钮添加到向量中
+    //        }
+
+
+    resize(800,640);
+    setMaximumSize(900,700); // 窗口最大尺寸
+    move(0,0);
+
+    QPushButton *btn = new QPushButton("关闭",this);
+    btn->setFixedSize(120,50);
+    btn->move(10,10);
+
+    // 当前类对象 QPushButton 的点击事件感兴趣
+    // 使用 connect() 进行绑定到当前窗口的 close()
+    // 发送者和接受者都是 QObject 类对象的指针
+    // Qt5 的信号绑定槽函数的方式
+    connect(btn,&QPushButton::clicked,this,&Widget::close);
+
+
+    QPushButton *maxBtn = new QPushButton("最大化",this);
+    maxBtn->setFixedSize(120,50);
+    maxBtn->move(10,70);
+
+    // 绑定的槽函数是自定义的
+    connect(maxBtn,&QPushButton::clicked,this,&Widget::toggleShow);
+}
+
+void Widget::toggleShow() // 自定义槽函数
+{
+    // qDebug() 引入 <QDebug> 头文件
+    qDebug()<<"show or hide"<<this->isMaximized() <<endl;
+    if(isMaximized())
+    {
+        showNormal(); // 槽函数可以作为成员函数使用
+    }
+    else{
+        showMaximized();
+    }
+}
+
+Widget::~Widget()
+{
+}

qtdemo01/widget.h

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+#ifndef WIDGET_H
+#define WIDGET_H
+
+#include <QWidget>
+#include <QPushButton>
+#include <QDebug>
+
+class Widget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Widget(QWidget *parent = nullptr);
+    ~Widget();
+
+public:
+    void toggleShow();
+};
+#endif // WIDGET_H

qtdemo01/widget3.cpp

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+#include "widget3.h"
+
+Widget3::Widget3(QWidget *parent) : QWidget(parent)
+{
+    setWindowTitle("自定义信号和槽");
+    resize(800,640);
+
+    stu = new Student();
+    stu->setParent(this);
+
+    techr = new Teacher(this);
+
+    // 绑定无参信号
+    void(Student:: *sleep1)() = &Student::sleep;
+    void(Teacher:: *wakeup1)() = &Teacher::wake_up;
+    connect(stu,sleep1,techr,wakeup1);
+
+    // 绑定有参的信号和槽函数
+    void(Student:: *sleep2)(const QString &,int n) = &Student::sleep;
+    void(Teacher:: *wakeup2)(const QString &) = &Teacher::wake_up;
+    connect(stu,sleep2,techr,wakeup2);
+    // 手动发送一个信号
+    //    emit stu->sleep();
+
+    //    点击按钮发送学生睡觉的信号
+    QPushButton *btn = new QPushButton("我睡会",this);
+    btn->resize(120,50);
+    btn->move(20,20);
+
+    QPushButton *btn2 = new QPushButton("再睡会",this);
+    btn2->resize(120,50);
+    btn2->move(20,90);
+    edit = new QLineEdit(this);
+    edit->resize(300,50);
+    edit->move(20,160);
+
+    // 将一个信号绑定到另一个信号上，即发送另一个信号
+    //    connect(btn,&QPushButton::clicked,stu,&Student::sleep);
+    //            connect(btn,&QPushButton::clicked,this,&Widget3::to_sleep);
+    connect(btn, SIGNAL(clicked()) ,this,SLOT(to_sleep())); // QT4 的信号槽写法
+    //    connect(btn2,&QPushButton::clicked,this,&Widget3::to_sleep2);
+
+    // Lambda表达式（匿名函数）
+    //    connect(btn,&QPushButton::clicked,[&](){
+    //        emit stu->sleep();
+
+    //        void(Student:: *sleep1)() = &Student::sleep;
+    //        void(Teacher:: *wakeup1)() = &Teacher::wake_up;
+    //        disconnect(stu,sleep1,techr,wakeup1);
+    //    });
+    connect(btn2,&QPushButton::clicked,[&](){
+        const QString msg = edit->text();
+        emit stu->sleep(msg,2);
+    });
+}
+
+void Widget3::to_sleep()
+{
+    emit stu->sleep(); // 发送一个睡觉的信号
+}
+
+void Widget3::to_sleep2()
+{
+    const QString &msg = edit->text();
+    emit stu->sleep(msg,2);
+}

qtdemo01/widget3.h

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+#ifndef WIDGET3_H
+#define WIDGET3_H
+
+#include <QWidget>
+#include <QPushButton>
+#include <QLineEdit>
+#include "student.h"
+#include "teacher.h"
+
+class Widget3 : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit Widget3(QWidget *parent = nullptr);
+
+public slots:
+    void to_sleep();
+    void to_sleep2();
+
+private:
+    Student *stu;
+    Teacher *techr;
+    QLineEdit *edit; // 睡觉的原因
+
+signals:
+
+};
+
+#endif // WIDGET3_H