qtinstallEventFilter的使用

#include "widget.h"#include "ui_widget.h"#include Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget){ ui->setupUi(this); ui->label->installEventFilter(this); ui->label->setObjectName("hello");}Widget::~Widget(){ delete ui;}bool Widget::eventFilter(QObject *obj, QEvent *event){ //当鼠标按下label时，输出该对象名hello if (event->type() == QEvent::MouseButtonPress) { if (obj->inherits("QLabel")) { QLabel* label = qobject_cast(obj); if(label) qDebug() << label->objectName(); } } return QWidget::eventFilter(obj, event);}