如何给Qlabel添加clicked属性（覆盖mousePressEvent，处理QMouseEvent消息，反正是软绘制，想怎么样就怎么样）

clickedLabel.h

#ifndef CLICKLABEL_H
#define CLICKLABEL_H
#include <QLabel>
#include <QMouseEvent>

class ClickLabel : public QLabel
{
    Q_OBJECT
public:
    explicit ClickLabel(QWidget *parent = 0);
    ~ClickLabel();
signals:
    void clicked();//自定义clicked()信号,在mousePressEvent事件发生时触发
protected:
    virtual void mousePressEvent(QMouseEvent* event);//重写mousePressEvent事件
};

#endif // CLICKLABEL_H

clickedLabel.cpp

#include "clicklabel.h"

ClickLabel::ClickLabel(QWidget* parent)
    : QLabel(parent)
{
}

ClickLabel::~ClickLabel()
{
}

void ClickLabel::mousePressEvent(QMouseEvent *event)//重写mousePressEvent事件,检测事件类型是不是点击了鼠标左键
{
    //如果单击了就触发clicked信号
    if (event->button() == Qt::LeftButton) {
        //触发clicked信号
        emit clicked();
    }
    //将该事件传给父类处理
    QLabel::mousePressEvent(event);
}

使用前把qlabel的类提升为ClickLabel 
 

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添加SLOT函数

private slots:
    void clicklabel_clicked();  //定义槽函数处理label clicked

connect

 connect(ui->setrefresh_img_label, SIGNAL(clicked()), this, SLOT(clicklabel_clicked()));

---

 

 

http://blog.csdn.net/linbounconstraint/article/details/52414013