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private HandlerRegistration historyChangeHandlerRegistration;
@Override
protected void onLoad()
{
super.onLoad();
if(historyChangeHandlerRegistration == null)
{
historyChangeHandlerRegistration = History.addValueChangeHandler(historyHandler);
}
}
@Override
protected void onUnload()
{
super.onUnload();
if (historyChangeHandlerRegistration != null)
{
historyChangeHandlerRegistration.removeHandler();
historyChangeHandlerRegistration = null;
}
}
private ValueChangeHandler<String> historyHandler = new ValueChangeHandler<String>()
{
@Override
public void onValueChange(ValueChangeEvent<String> event)
{
if(historyChangeHandlerRegistration != null)
{
//some work with history token
}
else
{
// и сюда возможно попасть
}
}
};
guest10 25.08.2021 03:20 # 0