Qt：定义自定义事件类型 [英] Qt: Defining a custom event type

问题描述

我已经通过子类化QEvent在我的Qt应用程序中创建了一个自定义事件。

I have created a custom event in my Qt application by subclassing QEvent.

class MyEvent : public QEvent
{
  public:
    MyEvent() : QEvent((QEvent::Type)2000)) {}
    ~MyEvent(){}
}

为了检查这个事件，我在event（）方法中使用下面的代码：

In order to check for this event, I use the following code in an event() method:

if (event->type() == (QEvent::Type)2000)
{
  ...
}

我想能够在应用程序中定义自定义事件的类型，以便我不需要在我的事件方法中转换实际的整数。所以在我的event（）方法我想能够做一些像

I would like to be able to define the custom event's Type somewhere in my application so that I don't need to cast the actual integer in my event methods. So in my event() methods I'd like to be able to do something like

if (event->type() == MyEventType)
{
  ...
}

推荐答案

如果事件类型标识你的特定类，

If the event-type identifies your specific class, i'd put it there:

class MyEvent : public QEvent {
public:
    static const QEvent::Type myType = static_cast<QEvent::Type>(2000);
    // ...
};

// usage:
if(evt->type() == MyEvent::myType) {
    // ...
}

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