Qt 事件筛选器无法从QScrollArea截获控制盘事件
以下是事件筛选器:Qt 事件筛选器无法从QScrollArea截获控制盘事件,qt,events,qscrollarea,Qt,Events,Qscrollarea,以下是事件筛选器: bool ListenerClass::eventFilter(QObject *obj, QEvent *event) { std::cout << "Got event type " << event->type() << std::endl; return false; } 上述过滤器通常工作,因为它可以截取事件,如调整大小、悬停等。但是,仅当达到滚动范围边缘时,才截取滚轮事件,而不是在整个滚动期间截取滚轮事件
bool ListenerClass::eventFilter(QObject *obj, QEvent *event) {
std::cout << "Got event type " << event->type() << std::endl;
return false;
}
上述过滤器通常工作,因为它可以截取事件,如调整大小、悬停等。但是,仅当达到滚动范围边缘时,才截取滚轮事件,而不是在整个滚动期间截取滚轮事件
Viewport position User action Output
----------------------------------------------------------
Top downwards wheel <<No output>>
Middle downwards wheel <<No output>>
Middle downwards wheel <<No output>>
Just touch bottom downwards wheel Got event type 31
Bottom (can't downwards wheel Got event type 31
scroll anymore)
视口位置用户操作输出
----------------------------------------------------------
自上而下车轮
中下轮
中下轮
只需触摸底部向下的车轮即可获得事件类型31
底部(无法向下移动)事件类型31
滚动(不再)
如何在页面滚动期间截获控制盘事件?当用户滚动视口时,事件发生在滚动区域的
viewport()
小部件中。如果请求的滚动操作是可能的,那么事件将被接受,并且不会传播到滚动区域本身,因此您无法检测到它
要解决此问题,只需将事件过滤器安装到viewport()
小部件即可
Viewport position User action Output
----------------------------------------------------------
Top downwards wheel <<No output>>
Middle downwards wheel <<No output>>
Middle downwards wheel <<No output>>
Just touch bottom downwards wheel Got event type 31
Bottom (can't downwards wheel Got event type 31
scroll anymore)