Subclass QLabel

[Globulus]

I am new in QT...
So, my question is clear for most of you, but I still dont understand,
how can I subclass QLabel to make my own enterEvent, leaveEvent, mousePressEvent, mouseReleaseEvent, to extend QLabel functionality.
And then use it in my .ui application?

[Dong Back Kim]

I am new in QT...
So, my question is clear for most of you, but I still dont understand,
how can I subclass QLabel to make my own enterEvent, leaveEvent, mousePressEvent, mouseReleaseEvent, to extend QLabel functionality.
And then use it in my .ui application?

Hi there,

I reply here instead of the previous post.

class MyLabel : public QLabel
{
    Q_OBJECT
 
public:
    MyLabel(QWidget * parent = 0);
    ~MyLabel();
 
protected slots:
 
    virtual void enterEvent ( QEvent * event );
    virtual void leaveEvent ( QEvent * event );
    virtual void mouseMoveEvent ( QMouseEvent * event );
    virtual void mousePressEvent ( QMouseEvent * event );
    virtual void mouseReleaseEvent ( QMouseEvent * event );
};
 
MyLabel::MyLabel(QWidget * parent) : QWidget(parent)
{
}
 
MyLabel::~MyLabel()
{
}
 
void MyLabel::enterEvent ( QEvent * event )
{
}
 
void MyLabel::leaveEvent ( QEvent * event )
{
}
 
void MyLabel::mouseMoveEvent ( QMouseEvent * event )
{
}
 
void MyLabel::mousePressEvent ( QMouseEvent * event )
{
}
 
void MyLabel::mouseReleaseEvent ( QMouseEvent * event )
{
}

class MyLabel : public QLabel
{
    Q_OBJECT

public:
    MyLabel(QWidget * parent = 0);
    ~MyLabel();

protected slots:

    virtual void enterEvent ( QEvent * event );
    virtual void leaveEvent ( QEvent * event );
    virtual void mouseMoveEvent ( QMouseEvent * event );
    virtual void mousePressEvent ( QMouseEvent * event );
    virtual void mouseReleaseEvent ( QMouseEvent * event );
};

MyLabel::MyLabel(QWidget * parent) : QWidget(parent)
{
}

MyLabel::~MyLabel()
{
}

void MyLabel::enterEvent ( QEvent * event )
{
}

void MyLabel::leaveEvent ( QEvent * event )
{
}

void MyLabel::mouseMoveEvent ( QMouseEvent * event )
{
}

void MyLabel::mousePressEvent ( QMouseEvent * event )
{
}

void MyLabel::mouseReleaseEvent ( QMouseEvent * event )
{
}

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In order to use this widget in the QtDesigner...

1. remember the header file name of this class (i.e. MyLabel.h in this case)
2. go to QtDesigner and put a QLabel or QWidget into the form
3. and the promote the QLabel or QWidget to MyLabel.

Hope this helps.

Regards,

[Globulus]

That was usefull!
Thanks!

[Dong Back Kim]

That was usefull!
Thanks!

My pleasure =)

[nileshjarhad]

cn u gv me complete code for this...
?

[ChrisW67]

That is "complete code for this." What is more, inheriting from a class and overriding or adding functions is pure C++ and not Qt specific.