1.相关说明

监控鼠标进入组件、出组件、点击组件、双击组件的事件，需要重写eventFilter函数

2.相关界面

3.相关代码

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);ui->labSC->installEventFilter(this);ui->labDC->installEventFilter(this);
}Widget::~Widget()
{delete ui;
}bool Widget::eventFilter(QObject *watched, QEvent *event)
{if(watched == ui->labSC){if(event->type() == QEvent::Enter){ui->labSC->setStyleSheet("background-color:rgb(170,255,255)");}else if(event->type() == QEvent::Leave){ui->labSC->setText("单击");ui->labSC->setStyleSheet("");}else if(event->type() == QEvent::MouseButtonPress){ui->labSC->setText("button pressed");}else if(event->type() == QEvent::MouseButtonRelease){ui->labSC->setText("button released");}}if(watched == ui->labDC){if(event->type() == QEvent::Enter){ui->labDC->setStyleSheet("background-color:rgb(85,255,255)");}else if(event->type() == QEvent::Leave){ui->labDC->setText("双击");ui->labDC->setStyleSheet("");}else if(event->type() == QEvent::MouseButtonDblClick){ui->labDC->setText("button double clicked");}}if(watched == ui->labNo){if(event->type() == QEvent::Enter){ui->labNo->setStyleSheet("background-color:rgb(85,255,255)");}else if(event->type() == QEvent::Leave){ui->labNo->setText("No");ui->labNo->setStyleSheet("");}}return QWidget::eventFilter(watched, event);
}