TimeGraphDrawnEventLayer.java 文件源码

public TimeGraphDrawnEventLayer(TimeGraphWidget widget, Group parentGroup) {
    super(widget, parentGroup);

    ObservableSet<TimeGraphDrawnEventProvider> providers = TimeGraphDrawnEventProviderManager.instance().getRegisteredProviders();
    /* Populate with the initial values */
    providers.forEach(this::trackEventProvider);

    /* Add listeners to track registered/deregistered providers */
    providers.addListener((SetChangeListener<TimeGraphDrawnEventProvider>) change -> {
        if (change == null) {
            return;
        }
        TimeGraphDrawnEventProvider addedProvider = change.getElementAdded();
        if (addedProvider != null) {
            trackEventProvider(addedProvider);
        }

        TimeGraphDrawnEventProvider removedProvider = change.getElementRemoved();
        if (removedProvider != null) {
            untrackEventProvider(removedProvider);
        }
    });

    filterListener = new DrawnEventFilterListener(getWidget());
}