C++ QT 实现自定义事件

Mr.Wang8092025-09-27 20:58

自定义事件类

cpp 复制代码

#include <QEvent>

class MyEvent : public QEvent
{
public:
	MyEvent():QEvent(QEvent::Type(myEventType)) {}
	~MyEvent() {}
public:
	static int myEventType; //自定义事件类型
};
int MyEvent::myEventType = QEvent::registerEventType();

随便写一个继承QObject的类

cpp 复制代码

#include <QtWidgets/QMainWindow>
#include "ui_MyEventAppl.h"
#include "MyEvent.h"
#include <QPushButton>
#include <QGuiApplication>

class MyEventAppl : public QMainWindow
{
	Q_OBJECT

public:
	MyEventAppl(QWidget* parent = nullptr)
		: QMainWindow(parent)
	{
		ui.setupUi(this);
		connect(ui.pushButton, &QPushButton::pressed, this, &MyEventAppl::OnButtonClick);
		//ui.pushButton->installEventFilter(this);
		//ui.label->installEventFilter(this);
	}
protected:
	virtual void customEvent(QEvent* pEvent)
	{
		if (pEvent->type() == MyEvent::myEventType)
		{
			ui.label->setText("getMyEvent");
		}
	}
private slots:
	void OnButtonClick()
	{
		QGuiApplication::postEvent(/*QGuiApplication::focusObject()*/this, new MyEvent, Qt::NormalEventPriority);

	}
private:
	Ui::MyEventApplClass ui;
};

效果