Qt如何实现密码显示按钮

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PasswordLineEdit.h

#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

PasswordLineEdit.cpp

#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);}

main.cpp

#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();}

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