public CompletionMenuModel()

in completion/src/main/java/jetbrains/jetpad/completion/CompletionMenuModel.java [51:130]
73 lines of code
11 McCabe index (conditional complexity)

  public CompletionMenuModel(int chunkSize, int distanceFromEnd) {
    myChunkSize = chunkSize;
    myDistanceFromEndToLoad = distanceFromEnd;
    visibleCount = new ValueProperty<>(myChunkSize);

    visibleItems = Transformers.filter(new Function<CompletionItem, ReadableProperty<Boolean>>() {
      @Override
      public ReadableProperty<Boolean> apply(final CompletionItem input) {
        return new DerivedProperty<Boolean>(text) {
          @Override
          public Boolean doGet() {
            return input.isMatchPrefix(text.get() == null ? "" : text.get());
          }

          @Override
          public String getPropExpr() {
            return "isMatchPrefix(" + text.getPropExpr() + ", " + input + ")";
          }
        };
      }
    }).andThen(
      Transformers.sortBy(new Function<CompletionItem, ReadableProperty<CompletionItem>>() {
        @Override
        public ReadableProperty<CompletionItem> apply(final CompletionItem input) {
          return Properties.constant(input);
        }
      }, new Comparator<CompletionItem>() {
        @Override
        public int compare(CompletionItem c1, CompletionItem c2) {
          String text = "";

          int delta = c2.getSortPriority() - c1.getSortPriority();
          if (delta != 0) {
            return delta;
          }

          String t1 = c1.visibleText(text);
          String t2 = c2.visibleText(text);
          if (c1.isMatch(text) && !c2.isMatch(text)) {
            return -1;
          }
          if (!c1.isMatch(text) && c2.isMatch(text)) {
            return 1;
          }
          return t1.compareTo(t2);
        }
      })
    ).andThen(
      Transformers.<CompletionItem>firstN(visibleCount)
    ).transform(items).getTarget();

    visibleItems.addHandler(new EventHandler<CollectionItemEvent<? extends CompletionItem>>() {
      @Override
      public void onEvent(CollectionItemEvent<? extends CompletionItem> event) {
        if (myDisableReset) return;

        if (visibleItems.isEmpty()) {
          selectedItem.set(null);
        } else {
          selectedItem.set(visibleItems.get(0));
        }
      }
    });

    selectedItem.addHandler(new EventHandler<PropertyChangeEvent<CompletionItem>>() {
      @Override
      public void onEvent(PropertyChangeEvent<CompletionItem> event) {
        int index = visibleItems.lastIndexOf(event.getNewValue());
        if (index == -1) return;
        if ((visibleCount.get() - 1) - index <= myDistanceFromEndToLoad) {
          myDisableReset = true;
          try {
            visibleCount.set(visibleCount.get() + myChunkSize);
          } finally {
            myDisableReset = false;
          }
        }
      }
    });
  }