Den 29-01-2014 09:27, Etienne Sandré-Chardonnal skrev:
> Dear all,
>
> I'm facing the following issue. I would like to forward events (keys,
> mouse, etc...) from a widget to a child widget. I have tried calling
> sendEvent(child, event) from reimplemented event handlers.
>
> However, if the child ignores the event, this is re-propagated to its
> parent, and this crashes due to recursion. Is there an elegant simple
> way to make this work?
You have three choices here, I think:
1) Un-protect the events that you need and call the event handler method
directly:
class Child {
public:
use keyPressEvent;
};
void Parent::keyPressEvent(event) {
...
child->keyPressEvent();
}
2) Switch direction. Instead of trying to bend the Qt event system to do
what you want, use normal methods:
class Child {
public:
void handleKeyPress(event)
};
void Parent::keyPressEvent(event) {
...
child->handleKeyPress();
}
3) Continue with your current sendEvent idea, but store the event
pointer in the parent and check if you get an event resent.
My choice would be 2). I don't like doing weird things to something like
events. You do not want to make a mistake in this area.
3) is only acceptable if you absolutely have to support unknown sets of
children. It's a brittle approach and the one that's most likely to go
bad at some point.
Bo.
--
Bo Thorsen, European Engineering Manager, ICS
Integrated Computer Solutions. Delivering World-Class Applications
http://ics.com/services
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