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Kod: Zaznacz cały

#include <QLabel>
#include <QMouseEvent>

class CustomLabel: public QLabel
{
    Q_OBJECT

public:
    CustomLabel(QWidget *parent): QLabel(parent), m_pressed(false) {}

protected:
    void mousePressEvent(QMouseEvent *e)
    {
        if (e->button() == Qt::LeftButton)
            m_pressed = true;
    }

    void mouseReleaseEvent(QMouseEvent *e)
    {
        if (e->button() == Qt::LeftButton && m_pressed)
        {
            m_pressed = false;
            emit clicked();
        }
    }

signals:
    void clicked();

private:
    bool m_pressed;
};