Prevent onRightButtonPress From Being Clicked Repeatedly

[cancan101]

Add some mechanism to prevent onRightButtonPress from being clicked Repeatedly. Right now if the action of clicking onRightButtonPressis asynchronous, it may be hit a second time. Resulting in duplicate navigations.

I tried adding state the button allowing only one press but I don't know how to clear this when the back button is pressed returning to the current route.

Ideally after a call to something like navigator.push(route), the button would be disabled.

[aksonov]

I had this problem as well. I've used onWillFocus, onDidBlur handler to prevent duplicate transition - once latest route from navigator.getCurrentRoutes() is not in focus, i'm not processing 'push' action. I've implemented it with new release of https://github.com/aksonov/react-native-router-flux

[corbt]

I created a PR that fixes this issue, but @ide thinks there's a better way to implement it. #71