qt - 临时阻塞两个 QObject 之间的信号

Question

我想一般性地暂时阻止两个 QObjects 之间的信号。无需修改其他信号/槽的行为，并且不知道它们的上下文。

像 QObject::blockSignals(bool) , 但只在两个 QObjects 之间起作用.

也就是执行下面的SignalBlocker::blockSignals(bool)功能:

class SignalBlocker {

public:
  SignalBlocker(QObject *sender, QObject *receiver) :
    mSender(sender), mReceiver(receiver) {}
  void blockSignals(bool block);

private:
  QObject *mSender, *mReceiver;
}

可以通过断开和重新连接对象来实现，但首先必须存储信号/插槽列表。
自省(introspection)方法似乎不够强大，无法实现这一点(我查看了 QMetaObject 和 QSignalSpy 没有成功)。

Answer 1

QT 无法仅禁用信号槽对。试试这个解决方法:

struct SignalDisabler
{
    SignalDisabler(const QObject *sender, const char *signal, const QObject *receiver, const char *member)
        : sender(sender)
        , signal(signal)
        , receiver(receiver)
        , member(member)
    {
        QObject::disconnect(sender, signal, receiver, member);
    }

    ~SignalDisabler()
    {
        QObject::connect(sender, signal, receiver, member);
    }

    const QObject *sender;
    const char *signal;
    const QObject *receiver;
    const char *member;
};