qt-C++笔记之使用信号和槽实现跨类成员变量同步响应
—— 杭州 2024-01-24
code review!
1.运行
2.main.cpp
代码
#include <QCoreApplication>
#include <QObject>
#include <QDebug>
// MySource 类定义
class MySource : public QObject {
Q_OBJECT
public:
MySource() : m_value(0) {
}
void setValue(int value) {
if (m_value != value) {
m_value = value;
emit valueChanged(m_value);
}
}
signals:
void valueChanged(int newValue);
private:
int m_value;
};
// MyTarget 类定义
class MyTarget : public QObject {
Q_OBJECT
public slots:
void onValueChanged(int newValue) {
qDebug() << "Value changed to:" << newValue;
m_value = newValue;
// 这里可以添加其他响应newValue变化的代码
}
private:
int m_value;
};
#include "main.moc" // 如果你使用的是qmake，确保这个文件可以被moc工具找到
// 主函数
int main(int argc, char *argv[]) {
QCoreApplication a(argc, argv);
MySource source;
MyTarget target;
// 将source的valueChanged信号连接到target的onValueChanged槽
QObject::connect(&source, &MySource::valueChanged, &target, &MyTarget::onValueChanged);
// 当我们设置source的值时，target的onValueChanged槽将被调用
source.setValue(10); // target的onValueChanged将被调用，打印"Value changed to: 10"
source.setValue(20); // target的onValueChanged将被调用，打印"Value changed to: 20"
return a.exec();
}
3.test.pro
# filename: test.pro
QT += core
QT -= gui
TARGET = test
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
4.编译
/usr/lib/qt5/bin/qmake test.pro
make
