The solution was to modify the DefaultHistorian by overriding
addValueChangeHanlder. I was then able to inspect the value change event
before passing it along to the PlaceHistoryHandler.
PlaceHistoryHandler historyHandler=new PlaceHistoryHandler(
getPlaceHistoryMapper(),getHistorian());
public Historian getHistorian() {
return new PlaceHistoryHandler.DefaultHistorian(){
@Override
public HandlerRegistration addValueChangeHandler(final
ValueChangeHandler<String> valueChangeHandler) {
//The PlaceHistoryHandler will be adding this ValueChangeHandler. Override
and inspect the ValueChangeEvent before alerting the PlaceHistoryHandler
that there has been a change.
return super.addValueChangeHandler(new ValueChangeHandler<String>() {
@Override
public void onValueChange(ValueChangeEvent<String> event) {
if(event.getValue().toLowerCase().equals("toc") //Ignore table of contents
navigation event.
|| event.getValue().indexOf(WcagHelper.HYPERLINK_PREFIX)>=0){ //Ignore
specially marked hyperlinks.
return;
}
//We made it this far so it is safe to pass the navigation event along.
valueChangeHandler.onValueChange(event);
}
});
}
};
}
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