[Qt]《开发指南》3.1源码分析

界面：

ButterflyGraph：

可以看出，本工程在主程序main里调用窗口界面qmywidget，窗口界面继承了QWidget，并调用自定义类qperson，推测是qmywidget类中的一个属性

qmywidget的实现，调用了显示界面ui_qmywidget，包含了元对象QMetaProperty

UML图：

QmyWidget中，on开头的都是槽函数，QmyWidget是主窗口，所以不发射信号，只接收信号

main.cpp

 1 #include "qmywidget.h"

 2 #include <QApplication>

 3

 4 int main(int argc, char *argv[])

 5 {

 6     QApplication a(argc, argv);

 7     QmyWidget w;

 8     w.show();

 9

10     return a.exec();

11 }

qperson.h

 1 #ifndef QPERSON_H

 2 #define QPERSON_H

 3

 4 #include <QObject>

 5

 6 class QPerson : public QObject

 7 {

 8     Q_OBJECT

 9

10     Q_CLASSINFO("author","Wang")

11     Q_CLASSINFO("company","UPC")

12     Q_CLASSINFO("version","1.0.0")

13

14     Q_PROPERTY(int age READ age WRITE setAge NOTIFY ageChanged)

15     Q_PROPERTY(QString name MEMBER m_name)

16     Q_PROPERTY(int score MEMBER m_score)

17 private:

18     int  m_age=10;

19     QString m_name;

20     int     m_score=79;

21 public:

22     explicit QPerson(QString fName, QObject *parent = nullptr);

23

24     int     age();

25     void    setAge(int value);

26

27     void    incAge();

28 signals:

29     void    ageChanged( int  value);

30

31 public slots:

32 };

33

34 #endif // QPERSON_H

qmywidget.cpp

  1 #include "qmywidget.h"

  2 #include "ui_qmywidget.h"

  3 #include    <QMetaProperty>

  4

  5 QmyWidget::QmyWidget(QWidget *parent) :

  6     QWidget(parent),

  7     ui(new Ui::QmyWidget)

  8 {//构造函数

  9     ui->setupUi(this);

 10

 11     boy=new QPerson("王小明");

 12     boy->setProperty("score",95);

 13     boy->setProperty("age",10);

 14     boy->setProperty("sex","Boy");//动态属性

 15 //    connect(boy,SIGNAL(ageChanged(int)),this,SLOT(on_ageChanged(int)));

 16     connect(boy,&QPerson::ageChanged,this,&QmyWidget::on_ageChanged);

 17

 18     girl=new QPerson("张小丽");

 19     girl->setProperty("score",81);

 20     girl->setProperty("age",20);

 21     girl->setProperty("sex","Girl");//动态属性

 22     connect(girl,&QPerson::ageChanged,this,&QmyWidget::on_ageChanged);

 23

 24     ui->spinBoy->setProperty("isBoy",true); //动态属性

 25     ui->spinGirl->setProperty("isBoy",false);

 26

 27 //  不能使用此形式，因为QSpinBox有两种参数形式的valueChanged()信号

 28 //    connect(ui->spinGirl,&QSpinBox::valueChanged,

 29 //            this,&QmyWidget::on_spinBoy_valueChanged);

 30     connect(ui->spinGirl,SIGNAL(valueChanged(int)),

 31             this,SLOT(on_spin_valueChanged(int)));

 32     connect(ui->spinBoy,SIGNAL(valueChanged(int)),

 33             this,SLOT(on_spin_valueChanged(int)));

 34 }

 35

 36 QmyWidget::~QmyWidget()

 37 {

 38     delete ui;

 39 }

 40

 41 void QmyWidget::on_ageChanged( int value)

 42 {//响应QPerson的ageChanged()信号

 43     Q_UNUSED(value);

 44     QPerson *aPerson = qobject_cast<QPerson *>(sender()); //类型投射

 45     QString hisName=aPerson->property("name").toString(); //姓名

 46 //    QString hisName=aPerson->name(); //获取姓名，错误

 47     QString hisSex=aPerson->property("sex").toString(); //动态属性

 48     int hisAge=aPerson->age();//通过接口函数获取年龄

 49 //    int hisAge=aPerson->property("age").toInt();//通过属性获得年龄

 50

 51     ui->textEdit->appendPlainText(hisName+","+hisSex

 52                                +QString::asprintf(",年龄=%d",hisAge));

 53 }

 54

 55 void QmyWidget::on_btnClear_clicked()

 56 {//"清空文本框"按钮

 57     ui->textEdit->clear();

 58 }

 59

 60 void QmyWidget::on_btnBoyInc_clicked()

 61 {//"boy长大一岁"按钮

 62     boy->incAge();

 63 }

 64

 65 void QmyWidget::on_btnGirlInc_clicked()

 66 {//"girl长大一岁"按钮

 67     girl->incAge();

 68 }

 69

 70 void QmyWidget::on_spin_valueChanged(int arg1)

 71 {//响应界面上spinBox的valueChanged(int)信号

 72     Q_UNUSED(arg1);

 73     QSpinBox *spinBox = qobject_cast<QSpinBox *>(sender());

 74     if (spinBox->property("isBoy").toBool())

 75         boy->setAge(spinBox->value());

 76     else

 77         girl->setAge(spinBox->value());

 78 }

 79

 80 void QmyWidget::on_btnClassInfo_clicked()

 81 {//"类的元对象信息"按钮

 82     const QMetaObject *meta=boy->metaObject();

 83 //    const QMetaObject *meta=girl->metaObject();

 84 //    const QMetaObject *meta=ui->spinBoy->metaObject();

 85     ui->textEdit->clear();

 86

 87     ui->textEdit->appendPlainText("==元对象信息==\n");

 88     ui->textEdit->appendPlainText(QString("类名称：%1\n").arg(meta->className()));

 89

 90     ui->textEdit->appendPlainText("property");

 91     for (int i=meta->propertyOffset();i<meta->propertyCount();i++)

 92     {

 93         const char* propName=meta->property(i).name();

 94         ui->textEdit->appendPlainText(

 95            QString("属性名称=%1，属性值=%2").arg(propName).arg(boy->property(propName).toString()));

 96     }

 97

 98     ui->textEdit->appendPlainText("");

 99     ui->textEdit->appendPlainText("classInfo");

100     for (int i=meta->classInfoOffset();i<meta->classInfoCount();++i)

101     {

102        QMetaClassInfo classInfo=meta->classInfo(i);

103         ui->textEdit->appendPlainText(

104            QString("Name=%1; Value=%2").arg(classInfo.name()).arg(classInfo.value()));

105     }

106

107 }

qperson.cpp

 1 #include "qperson.h"

 2

 3 QPerson::QPerson(QString fName,QObject *parent) : QObject(parent)

 4 { //构造函数

 5     m_name=fName;

 6 }

 7

 8 int QPerson::age()

 9 { //返回age

10     return  m_age;

11 }

12

13 void QPerson::setAge(int value)

14 {//设置age

15     m_age=value;

16     emit ageChanged(m_age); //发射信号

17 }

18

19 void QPerson::incAge()

20 {

21     m_age++;

22     emit ageChanged(m_age);//发射信号

23 }

巴特西

[Qt]《开发指南》3.1源码分析

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