Qt 5.9 C++开发指南-Qt核心特点源码

#include "widget.h" #include "ui_widget.h" #include <QSpinBox> #include "qperson.h" #include <QTextEdit> #include <QMetaProperty> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { //构造函数 ui->setupUi(this); boy=new qperson("王明"); boy->setProperty("score",95); boy->setProperty("age",10); boy->setProperty("sex","Boy");//动态属性 // connect(boy,SIGNAL(ageChanged(int)),this,SLOT(on_ageChanged(int))); connect(boy,&qperson::ageChanged,this,&Widget::on_ageChanged); girl=new qperson("张丽"); girl->setProperty("score",81); girl->setProperty("age",20); girl->setProperty("sex","Girl");//动态属性 connect(girl,&qperson::ageChanged,this,&Widget::on_ageChanged); ui->spinBoy->setProperty("isBoy",true); //动态属性 ui->spinGirl->setProperty("isBoy",false); // 不能使用此形式，因为QSpinBox有两种参数形式的valueChanged()信号 // connect(ui->spinGirl,&QSpinBox::valueChanged, // this,&QmyWidget::on_spinBoy_valueChanged); connect(ui->spinGirl,SIGNAL(valueChanged(int)), this,SLOT(on_spin_valueChanged(int))); connect(ui->spinBoy,SIGNAL(valueChanged(int)), this,SLOT(on_spin_valueChanged(int))); } Widget::~Widget() { delete ui; } //获取不同对象对应的属性值，并显示在textEdit上 void Widget::on_ageChanged(int value) { //响应QPerson的ageChanged()信号 Q_UNUSED(value); qperson *aPerson = qobject_cast<qperson *>(sender()); //类型投射 QString hisName=aPerson->property("name").toString(); //姓名 // QString hisName=aPerson->name(); //获取姓名，错误 QString hisSex=aPerson->property("sex").toString(); //动态属性 int hisAge=aPerson->age();//通过接口函数获取年龄 // int hisAge=aPerson->property("age").toInt();//通过属性获得年龄 ui->textEdit->appendPlainText(hisName+","+hisSex +QString::asprintf(",age=%d",hisAge)); } void Widget::on_spin_valueChanged(int arg1) { //响应界面上spinBox的valueChanged(int)信号 Q_UNUSED(arg1); QSpinBox *spinBox = qobject_cast<QSpinBox *>(sender()); if (spinBox->property("isBoy").toBool()) boy->setAge(spinBox->value()); else girl->setAge(spinBox->value()); } void Widget::on_btnClear_clicked() { //"清空文本框"按钮 ui->textEdit->clear(); } void Widget::on_btnBoyInc_clicked() { //"boy长大一岁"按钮 boy->incAge(); } void Widget::on_btnGirlInc_clicked() { //"girl长大一岁"按钮 girl->incAge(); } void Widget::on_btnClassInfo_clicked() { //"类的元对象信息"按钮，显示的时类的信息，不管是boy或者girl都是可以的 // const QMetaObject *meta=boy->metaObject(); const QMetaObject *meta=girl->metaObject(); //获取元对象 // const QMetaObject *meta=ui->spinBoy->metaObject(); ui->textEdit->clear(); ui->textEdit->appendPlainText("==元对象信息==\n"); ui->textEdit->appendPlainText(QString("类名称: %1\n").arg(meta->className())); ui->textEdit->appendPlainText("property"); for (int i=meta->propertyOffset();i<meta->propertyCount();i++) { const char* propName=meta->property(i).name(); ui->textEdit->appendPlainText( QString("属性名称=%1，属性值=%2").arg(propName).arg(boy->property(propName).toString())); } ui->textEdit->appendPlainText(""); ui->textEdit->appendPlainText("classInfo"); for (int i=meta->classInfoOffset();i<meta->classInfoCount();++i) { QMetaClassInfo classInfo=meta->classInfo(i); ui->textEdit->appendPlainText( QString("Name=%1; Value=%2").arg(classInfo.name()).arg(classInfo.value())); } }