Class TopologyBox

src/main/java/fieldbox/boxes/plugins/TopologyBox.java:29–199

A Box with a custom drawer for holding onto and drawning a connection between two other boxes. Automatically deletes itself should either of its two ends disappears.

 * Automatically deletes itself should either of its two ends disappears.
 */
public class TopologyBox extends Box
	    implements IO.Loaded // the drawer is initialized after all the properties are loaded
{

	static public final Dict.Prop<BoxRef> head = new Dict.Prop<>("head").type().toCanon().doc("the head of this topology arrow box");
	static public final Dict.Prop<BoxRef> tail = new Dict.Prop<>("tail").type().toCanon().doc("the tail of this topology arrow box");

	static {
		// these properties need to be saved in our document
		IO.persist(head);
		IO.persist(tail);
	}

	public TopologyBox(Box head, Box tail) {
		this.properties.put(TopologyBox.head, new BoxRef(head));
		this.properties.put(TopologyBox.tail, new BoxRef(tail));

		loaded();
	}

	/**
	 * custom constructor, call init after you are done
	 */
	public TopologyBox() {
	}

	public void loaded() {
		this.properties.putToMap(Boxes.insideRunLoop, "main.__checkfordeletion__", this::checkForDeletion);
		this.properties.putToMap(Boxes.insideRunLoop, "main.__updateframe__", this::updateFrameToMiddle);
		this.properties.computeIfAbsent(frameDrawing, this::defaultdrawsLines);
		this.properties.put(frame, head().properties.get(frame).union(tail().properties.get(frame)));
		this.properties.put(FrameManipulation.lockHeight, true); // the dimensions of this box cannot be changed
		this.properties.put(FrameManipulation.lockWidth, true);
		this.properties.put(FrameManipulation.lockX, true); // nor can its position
		this.properties.put(FrameManipulation.lockY, true);

		this.properties.put(Box.name, head().properties.get(Box.name) + "->" + tail().properties.get(Box.name));
		this.properties.put(DragToCopy._ownedByParent, true);
	}


	protected Map<String, Function<Box, FLine>> defaultdrawsLines(Dict.Prop<Map<String, Function<Box, FLine>>> k) {
		Map<String, Function<Box, FLine>> r = new LinkedHashMap<>();

		r.put("__outline__", new Cached<Box, Object, FLine>((box, previously) -> {
			Rect rect = box.properties.get(frame);
			if (rect == null) return null;

			FLine f = arc(((TopologyBox) box).head().properties.get(frame), ((TopologyBox) box).tail().properties.get(frame));

			f = thickenArc(f, ((TopologyBox) box).head().properties.get(frame), ((TopologyBox) box).tail().properties.get(frame));

			boolean selected = box.properties.isTrue(Mouse.isSelected, false);

			f.attributes.put(fillColor, selected ? new Vec4(1, 1, 1, -1f) : new Vec4(1, 1, 1, 0.85f));
			f.attributes.put(strokeColor, selected ? new Vec4(1, 1, 1, 0.25f) : new Vec4(1, 1, 1, 0.15f));
			f.attributes.put(thicken, new BasicStroke(selected ? 3 : 0.5f, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_MITER));