如何在不同的类中编写lineEdit的connect语句

Question

我如何使信号和lineEdit插槽在另一个类中声明？ LineEdit是在Peakdetechtion类中声明的，我想在Peakdetechtion中制作信号和插槽， peaksettingform怎么办？

Answer 1

QLineEdit必须从外部（公共或获取）进行访问，或者您必须转发您感兴趣的信号。

可访问的版本（不完整且非常脏）

class Peakdetechtion { // horrible name
public:
  QLineEdit* getLineEdit() { return m_lineEdit; } // don't do it

private:
  QLineEdit* m_lineEdit;
};

class Peaksettingform : public QObject { //horrible name
  Q_OBJECT
public:
  Peaksettingform(Peakdetechtion *p, QObject *parent = 0)
  : QObject(parent) {
    // you can do this from outside and replace 'this' with a pointer to a Peaksettingform object 
    connect(p->getLineEdit(), SIGNAL(textChanged(const QString &)), this, SLOT(handleText(const QString &))); 
}

public slots:
  void handleText(const QString &);
};

信号转发

class Peakdetechtion : public QObject { // horrible name
Q_OBJECT
public:
  Peakdetechtion() {
    m_lineEdit = new QLineEdit(); // should have a parent but i am lazy
    connect(m_lineEdit, SIGNAL(textChanged(const QString&)), this, SIGNAL(leTextChanged(const QString&)));
  }

signals:
  void leTextChanged(const QString &);

private:
  QLineEdit* m_lineEdit;
};

class Peaksettingform : public QObject { //horrible name
  Q_OBJECT
public:
  Peaksettingform(Peakdetechtion *p, QObject *parent = 0)
  : QObject(parent) {
    // you can do this from outside and replace 'this' with a pointer to a Peaksettingform object 
    connect(p, SIGNAL(leTextChanged(const QString &)), this, SLOT(handleText(const QString &))); 
}

public slots:
  void handleText(const QString &);
};