QT实现消息未读提示

#ifndef BTNQLABELDEMO_H
#define BTNQLABELDEMO_H#include <QWidget>#include <QPushButton>
#include <QLabel>
#include <QVBoxLayout>// 自定义带消息提示的按钮
class BadgeButton : public QPushButton
{Q_OBJECT
public:explicit BadgeButton(QWidget *parent = nullptr) : QPushButton(parent){// 创建红色提示原点m_badge = new QLabel(this);m_badge->setFixedSize(10, 10);  // 原点大小m_badge->setStyleSheet("background-color: red; border-radius: 5px;");  // 圆形样式m_badge->hide();  // 默认隐藏// 设置原点位置（右上角）updateBadgePosition();}// 显示/隐藏提示原点void setBadgeVisible(bool visible){m_badge->setVisible(visible);}protected:// 按钮大小改变时更新原点位置void resizeEvent(QResizeEvent *event) override{QPushButton::resizeEvent(event);updateBadgePosition();}private:QLabel *m_badge;// 更新原点位置到右上角void updateBadgePosition(){int x = width() - m_badge->width() - 2;  // 靠右偏移2pxint y = 2;  // 靠上偏移2pxm_badge->move(x, y);}
};#endif // BTNQLABELDEMO_H