Class FLineInteraction

src/main/java/fieldbox/boxes/FLineInteraction.java:23–211

Fundamental interaction support for FLines when placed on the canvas. FLines can respond to mouse events --- OnMouseEnter and OnMouseExit. Add FLines that support interaction to the "interactiveDrawing" property (signature Map >). Add implementations of Mouse.OnMouseE

 * FLines can respond to mouse events --- OnMouseEnter and OnMouseExit. Add FLines that support interaction to the "interactiveDrawing" property
 * (signature Map<String, Function<Box, FLine>>). Add implementations of Mouse.OnMouseEnter,Mouse.OnMouseExit & Mouse.OnMouseDown to FLine.attributes
 * (the shape of the line governs the sense of "enter" and "exit"). See MarkingMenus for an example of the use of this class.
 */
public class FLineInteraction extends Box implements Drawing.Drawer, Mouse.OnMouseDown, Mouse.OnMouseMove {

	static public final Dict.Prop<FLineInteraction> interaction = new Dict.Prop<>("interaction").type().toCanon()
		.doc("the FLineInteraction Plugin");
	static public final Dict.Prop<FLine> _interactionTarget = new Dict.Prop<>("_interactionTarget").type().toCanon();

	static public final Dict.Prop<Cached<FLine, Object, Area>> projectedArea = new Dict.Prop<>("_projectedArea");

	static public final Dict.Prop<IdempotencyMap<Function<Box, FLine>>> interactiveDrawing = new Dict.Prop<>("interactiveDrawing").type().toCanon().autoConstructs(() -> new IdempotencyMap<>(Function.class)).set(IO.dontCopy, true)
		.doc("add lines to this property to make them interactive. onMouseExit and onMouseEnter attributes will be called appropriately. See FLineButton for a helper class.");

	static public final Dict.Prop<Float> interactionOutset = new Dict.Prop<>("interactionOutset").type().toCanon()
		.doc("sets how much shapes are outset for the purposes of hovering, clicking and draging").set(Dict.domain, "fline");


	static public final Dict.Prop<IdempotencyMap<Supplier<FLine>>> interactiveLines = new Dict.Prop<>("interactiveLines").type().autoConstructs(() -> new IdempotencyMap<>(Supplier.class)).set(IO.dontCopy, true)
		.toCanon()
		.doc("add lines to this property to make them interactive. onMouseExit and onMouseEnter attributes will be called appropriately. See FLineButton for a helper class.");

	public FLineInteraction(Box root) {
		properties.putToList(Drawing.drawers, this);
		properties.put(interaction, this);
		properties.putToMap(Mouse.onMouseDown, "__flineInteraction__", this);
		properties.putToMap(Mouse.onMouseMove, "__flineInteraction__", this);
	}

	Set<FLine> all = null;

	@Override
	public void draw(DrawingInterface context) {
		all = new LinkedHashSet<>();
		this.breadthFirst(this.both()).forEach(x -> {
			try {
				Rect r = x.properties.get(frame);
				{
					Map<String, Function<Box, FLine>> drawing = x.properties
						.get(interactiveDrawing);

					if (drawing != null && drawing.size() > 0) {
						Iterator<Function<Box, FLine>> it = drawing.values().iterator();
						while (it.hasNext()) {
							Function<Box, FLine> f = it.next();
							FLine fl = f.apply(x);
							if (fl == null) it.remove();
							else all.add(fl);
						}
					}
				}
				{
					Map<String, Supplier<FLine>> drawing = x.properties.get(interactiveLines);

					if (drawing != null && drawing.size() > 0) {
						Iterator<Supplier<FLine>> it = drawing.values().iterator();
						while (it.hasNext()) {
							Supplier<FLine> f = it.next();
							FLine fl = f.get();