Clickable QLabel: Difference between revisions

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=A ‘Click’able QLabel=
{{LangSwitch}}
A "clicked" signal may sometimes be required from a label, but there is no "clicked" signal emitted by QLabel. You can work around this easily by making a QPushButton like a label by setting the 'flat' property.


A “clicked” signal may sometimes be required from a label, but there is no “clicked” signal emitted by QLabel.<br /> You can work around this easily by making a QPushButton like a label by setting the ‘flat’ property.
However, if there are other properties of a QLabel object that you need, here is a code snippet for a custom QLabel which can emit a signal: 'clicked'. In other words, a Clickable QLabel!


However, if there are other properties of a QLabel object that you need, here is a code snippet for a custom QLabel which can emit a signal : ‘clicked’.<br /> In other words, a Clickable QLabel!
== Header ==


==Header==
<nowiki>
#ifndef CLICKABLELABEL_H
#define CLICKABLELABEL_H


==Source==
#include <QLabel>
#include <QWidget>
#include <Qt>


What we do here is simple : Catch the mouse press event on the label. Then emit ‘clicked’ signal. We could as well make the signal be emitted when mouse gets released. This is let to be a decision of the developer.
class ClickableLabel : public QLabel {
    Q_OBJECT


===Categories:===
public:
    explicit ClickableLabel(QWidget* parent = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags());
    ~ClickableLabel();


* [[:Category:Developing with Qt|Developing_with_Qt]]
signals:
* [[:Category:snippets|snippets]]
    void clicked();
 
protected:
    void mousePressEvent(QMouseEvent* event);
 
};
 
#endif // CLICKABLELABEL_H
 
</nowiki>
 
== Source ==
 
<nowiki>
#include "clickablelabel.h"
 
ClickableLabel::ClickableLabel(QWidget* parent, Qt::WindowFlags f)
    : QLabel(parent) {
   
}
 
ClickableLabel::~ClickableLabel() {}
 
void ClickableLabel::mousePressEvent(QMouseEvent* event) {
    emit clicked();
}
 
</nowiki>
 
What we do here is simple: Catch the mouse press event on the label. Then emit 'clicked' signal. We could as well make the signal be emitted when mouse gets released. This is let to be a decision of the developer.
 
[[Category:Developing_with_Qt]]

Latest revision as of 13:32, 29 January 2021

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A "clicked" signal may sometimes be required from a label, but there is no "clicked" signal emitted by QLabel. You can work around this easily by making a QPushButton like a label by setting the 'flat' property.

However, if there are other properties of a QLabel object that you need, here is a code snippet for a custom QLabel which can emit a signal: 'clicked'. In other words, a Clickable QLabel!

Header

#ifndef CLICKABLELABEL_H
#define CLICKABLELABEL_H

#include <QLabel>
#include <QWidget>
#include <Qt>

class ClickableLabel : public QLabel { 
    Q_OBJECT 

public:
    explicit ClickableLabel(QWidget* parent = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags());
    ~ClickableLabel();

signals:
    void clicked();

protected:
    void mousePressEvent(QMouseEvent* event);

};

#endif // CLICKABLELABEL_H


Source

#include "clickablelabel.h"

ClickableLabel::ClickableLabel(QWidget* parent, Qt::WindowFlags f)
    : QLabel(parent) {
    
}

ClickableLabel::~ClickableLabel() {}

void ClickableLabel::mousePressEvent(QMouseEvent* event) {
    emit clicked();
}


What we do here is simple: Catch the mouse press event on the label. Then emit 'clicked' signal. We could as well make the signal be emitted when mouse gets released. This is let to be a decision of the developer.