Qt tips 如何给Qlabel添加clicked属性

• 有时候需要使用qlabel的clicked属性。但qlabel是没有clicked属性的。添加一个属性。

clickedLabel.h

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

class ClickLabel : public QLabel
{
    Q_OBJECT
public:
    explicit ClickLabel(QWidget *parent = );
    ~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

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()));
           

code

clicklabel.h

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

class ClickLabel : public QLabel
{
    Q_OBJECT
public:
    explicit ClickLabel(QWidget *parent = );
    ~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
           

clicklabel.cpp

#include "clicklabel.h"

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

ClickLabel::~ClickLabel()
{
}



//重写mousePressEvent事件,检测事件类型是不是点击了鼠标左键
void ClickLabel::mousePressEvent(QMouseEvent *event)
{
    //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);
}
           

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = );
    ~Widget();

private:
    Ui::Widget *ui;

private slots:
    //定义槽函数处理lineedit clicked
    void handlelabelclicked();
};

#endif // WIDGET_H
           

widget.cpp

#include "widget.h"
#include "ui_widget.h"
#include "clicklabel.h"
#include <QDebug>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    connect(ui->label, SIGNAL(clicked()), this, SLOT(handlelabelclicked()));
}

Widget::~Widget()
{
    delete ui;
}

void Widget::handlelabelclicked()
{
    qDebug() << "ppppppppppppppppp";
}
           

源代码这里写链接内容