コード例 #1
0
 private P getWithUpstreamTracking() {
   // this logic should probably go in DerivedValue somehow, except that
   // it's only a value and does not know about it's parent property
   if (value instanceof DerivedValue) {
     // Turn on implicitUpstream, which watches for properties called during value.get.
     // Also, keep track if anyone was already tracking derived values so we can put it back.
     List<Property<?>> tempUpstream = implicitUpstream;
     implicitUpstream = new ArrayList<Property<?>>();
     P tempValue = value.get();
     List<Property<?>> newUpstream = new ArrayList<Property<?>>(implicitUpstream);
     // Put back the previous upstream before we do anything else
     implicitUpstream = tempUpstream;
     // Only update our upstream properties if they've changed
     if (lastUpstream == null || !lastUpstream.equals(newUpstream)) {
       ListDiff<Property<?>> diff = ListDiff.of(lastUpstream, newUpstream);
       for (Property<?> removed : diff.removed) {
         removed.removeDerived(this);
       }
       for (Property<?> added : diff.added) {
         added.addDerived(this);
       }
       // Remember for change tracking next time
       lastUpstream = newUpstream;
     }
     return tempValue;
   } else {
     return value.get();
   }
 }
コード例 #2
0
 @Override
 protected void fireChanged(List<E> oldValue, List<E> newValue) {
   ListDiff<E> diff = ListDiff.of(oldValue, newValue);
   for (Location<E> added : diff.added) {
     fireEvent(new ValueAddedEvent<E>(added.element));
     listenForMemberChanged(added.element);
     addToAllValidIfNeeded(added.element);
   }
   for (Location<E> removed : diff.removed) {
     fireEvent(new ValueRemovedEvent<E>(removed.element));
     removeFromAllValidIfNeeded(removed.element);
   }
   fireEvent(new ListChangedEvent<E>(this, oldValue, newValue, diff));
   // if someone is listening for "did one of your models change", they
   // probably also care about a new model showing up/old model going away
   fireEvent(new MemberChangedEvent());
   super.fireChanged(oldValue, newValue);
 }