带有下划线的按钮_qt toolbutton下划线

继承QLabel，话不多说，直接上代码 

underlinebutton.h

#ifndef UNDERLINEBUTTON_H
#define UNDERLINEBUTTON_H
 
#include <QLabel>
#include <QMouseEvent>
 
class UnderlineButton : public QLabel
{
    Q_OBJECT
public:
    explicit UnderlineButton(QWidget *parent = 0);
    explicit UnderlineButton(const QString &text, QWidget *parent=0);
 
    bool isPress;
 
Q_SIGNALS:
    void clicked();
 
public slots:
    bool enterBtn(QPoint pp);
 
protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
};
 
#endif // UNDERLINEBUTTON_H

underlinebutton.cpp

#include "underlinebutton.h"
 
UnderlineButton::UnderlineButton(QWidget *parent) : QLabel(parent)
{
    isPress = false;
}
 
UnderlineButton::UnderlineButton(const QString &text, QWidget *parent) : QLabel(parent)
{
    setText("<U>" + text + "</U>");
    setStyleSheet("color:blue");
}
 
bool UnderlineButton::enterBtn(QPoint pp)
{
    int height = this->height();
    int width = this->width();
 
    QPoint btnMaxPos;
    btnMaxPos.setX(width);
    btnMaxPos.setY(height);
 
    if(pp.x() >= 0 && pp.y() >= 0 && pp.x() <= btnMaxPos.x() && pp.y() <= btnMaxPos.y())
       return true;
    else
       return false;
}
 
void UnderlineButton::mousePressEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton)
    {
        isPress = true;
        setStyleSheet("color:red");
    }
}
 
void UnderlineButton::mouseReleaseEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton)
    {
        isPress = false;
        setStyleSheet("color:blue");
        if (enterBtn(event->pos()))
        {
            emit clicked();
        }
    }
}

效果图：

可当按钮使用