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#ifndef PASSWORDLINEEDIT_H

#define PASSWORDLINEEDIT_H

#include <QAction>

#include <QLineEdit>

#include <QToolButton>

class PasswordLineEdit : public QLineEdit {

public:

  PasswordLineEdit(QWidget *parent = nullptr);

private slots:

  void onPressed();

  void onReleased();

protected:

  void enterEvent(QEvent *event);

  void leaveEvent(QEvent *event);

  void focusInEvent(QFocusEvent *event);

  void focusOutEvent(QFocusEvent *event);

private:

  QToolButton *button;

};

#endif // PASSWORDLINEEDIT_H

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#include "passwordlineedit.h"

PasswordLineEdit::PasswordLineEdit(QWidget *parent) : QLineEdit(parent)

{

    setEchoMode(QLineEdit::Password);

    QAction *action = addAction(QIcon(":/eyeOff"), QLineEdit::TrailingPosition);

    button = qobject_cast<QToolButton *>(action->associatedWidgets().last());

    button->hide();

    button->setCursor(QCursor(Qt::PointingHandCursor));

    connect(button, &QToolButton::pressed, this, &PasswordLineEdit::onPressed);

    connect(button, &QToolButton::released, this, &PasswordLineEdit::onReleased);

}

void PasswordLineEdit::onPressed()

{

    QToolButton *button = qobject_cast<QToolButton *>(sender());

    button->setIcon(QIcon(":/eyeOn"));

    setEchoMode(QLineEdit::Normal);

}

void PasswordLineEdit::onReleased()

{

    QToolButton *button = qobject_cast<QToolButton *>(sender());

    button->setIcon(QIcon(":/eyeOff"));

    setEchoMode(QLineEdit::Password);

}

void PasswordLineEdit::enterEvent(QEvent *event)

{

    button->show();

    QLineEdit::enterEvent(event);

}

void PasswordLineEdit::leaveEvent(QEvent *event)

{

    button->hide();

    QLineEdit::leaveEvent(event);

}

void PasswordLineEdit::focusInEvent(QFocusEvent *event)

{

    button->show();

    QLineEdit::focusInEvent(event);

}

void PasswordLineEdit::focusOutEvent(QFocusEvent *event)

{

    button->hide();

    QLineEdit::focusOutEvent(event);

}

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#include "passwordlineedit.h"

#include <QApplication>

#include <QFormLayout>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    QWidget w;

    PasswordLineEdit *w1 = new PasswordLineEdit;

    QLineEdit *w2 = new QLineEdit;

    QFormLayout *lay = new QFormLayout(&w);

    lay->addRow("PasswordLineEdit: ", w1);

    lay->addRow("QLineEdit: ", w2);

    w.show();

    return a.exec();

}