Qt tips 如何给Qlabel添加clicked属性

旧城等待， 2022-07-18 00:15 287阅读 0赞

*  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。

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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  
![这里写图片描述][20160902150627205]  
![这里写图片描述][20160902150635893]

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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()));

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![这里写图片描述][20160902151407699]

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**code**

--------------------

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 = 0);
        ~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][Link 1]

[20160902150627205]: /images/20220717/4a94797cb0184a5e92519e9c3a2444e5.png
[20160902150635893]: /images/20220717/e47ae967b9c849a8b21b7356e88e178e.png
[20160902151407699]: /images/20220717/3c93aa6ab59a494e87421ede469c2ea3.png
[Link 1]: http://download.csdn.net/detail/linbounconstraint/9622087