如何声明Qt 5中的New-Signal-Slot语法作为函数的参数 [英] How to declare New-Signal-Slot syntax in Qt 5 as a parameter to function

问题描述

如何通过信号或槽（成员函数，Qt 5中的新语法）作为函数的参数，然后调用 connect ？

例如

：不能编译 - PointerToMemberFunction

code>是我的问题。

  bool waitForSignal（const QObject * sender，PointerToMemberFunction ??? signal，int timeOut = 5000 / * ms * /）
 {
 if（sender == nullptr）
 return true; 
 bool isTimeOut = false; 
 QEventLoop loop; 
 QTimer timer; 
 timer.setSingleShot（true）; 
 QObject :: connect（& timer，& QTimer :: timeout，
 [& loop，& isTimeOut]（）
 {
 loop.quit 
 isTimeOut = true; 
}）; 
 timer.start（timeOut）; 
 QObject :: connect（sender，signal，& loop，& QEventLoop :: quit）; 
 loop.exec（）; 
 timer.stop（）; 
 return！isTimeOut; 
} 
  

有没有办法将信号列表传递给此函数进行连接？ / p>

解决方案

您应该创建模板：

  template< typename Func> 
 void waitForSignal（const typename QtPrivate :: FunctionPointer< Func> :: Object * sender，Func signal）{
 QEventLoop loop; 
 connect（sender，signal，& loop，& QEventLoop :: quit）; 
 loop.exec（）; 
} 
  

用法：

  waitForSignal（button，& QPushButton :: clicked）; 
  

How can I pass signal or slot (member-function, new syntax in Qt 5) as a parameter to function and then call connect?

e.g. I want to write a function that waits for a signal.

Note: It is not compile - PointerToMemberFunction is my question.

bool waitForSignal(const QObject* sender, PointerToMemberFunction??? signal, int timeOut = 5000/*ms*/)
{
  if (sender == nullptr)
    return true;
  bool isTimeOut = false;
  QEventLoop loop;
  QTimer timer;
  timer.setSingleShot(true);
  QObject::connect(&timer, &QTimer::timeout,
    [&loop, &isTimeOut]()
    {
      loop.quit();
      isTimeOut = true;
    });
  timer.start(timeOut);
  QObject::connect(sender, signal, &loop, &QEventLoop::quit);
  loop.exec();
  timer.stop();
  return !isTimeOut;
}

Is there any way to pass list of signals to this function for connection?

解决方案

You should create template:

template<typename Func>
void waitForSignal(const typename QtPrivate::FunctionPointer<Func>::Object *sender, Func signal) {
    QEventLoop loop;
    connect(sender, signal, &loop, &QEventLoop::quit);
    loop.exec();
}

Usage:

waitForSignal(button, &QPushButton::clicked);

这篇关于如何声明Qt 5中的New-Signal-Slot语法作为函数的参数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！