- 01
- 02
- 03
- 04
- 05
- 06
- 07
- 08
- 09
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
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
}
}
};