QLabel高亮教程

QLabel编程——高亮教程

自定义重写的QLabel

• 当鼠标进入时

• 当鼠标离开时

MyQLabel.cpp

#include "MyQLabel.h"
#include 

MyLabel::MyLabel(QWidget *parent)
    : QLabel(parent)
    , m_mouseEnterFlag(false)
{
}

MyLabel::~MyLabel()
{

}

void MyLabel::enterEvent(QEvent *ev)
{
    QWidget::enterEvent(ev);
    m_mouseEnterFlag = true;
    emit mouseEntered();
}

void MyLabel::leaveEvent(QEvent *event)
{
    this->setStyleSheet(""); 
    QLabel::leaveEvent(event); 
}

MyQLabel.h

#ifndef MYQLABEL_H
#define MYQLABEL_H
#include 

class MyLabel : public QLabel {
    Q_OBJECT

public:
    explicit MyLabel(QWidget *parent = nullptr);
    ~MyLabel();

protected:
    void enterEvent(QEvent *ev) override;
    void leaveEvent(QEvent *event)override;
private:
    bool m_mouseEnterFlag;

signals:
    void mouseEntered();
};

#endif // MYQLABEL_H

main.cpp

    MyLabel *label = new MyLabel(this);
    label->setText("test");
    connect(label, &MyLabel::mouseEntered, [label]() {
        label->setStyleSheet("background-color: #ffff99");
    });