InputHalter.java

package net.alcuria.umbracraft.engine.manager.input;

import net.alcuria.umbracraft.Game;
import net.alcuria.umbracraft.engine.events.Event;
import net.alcuria.umbracraft.engine.events.ScriptEndedEvent;
import net.alcuria.umbracraft.engine.events.ScriptStartedEvent;
import net.alcuria.umbracraft.engine.screens.SetInputEnabled;

/** A small helper class to handle multiple scripts halting input. It is
 * responsible for marking when input ought to be relinquished if a script is
 * halting input and restoring that input once all scripts halting have
 * completed.
 * @author Andrew Keturi */
public class InputHalter {

	private int haltCounter;
	private boolean haltInput;

	/** Checks an event, updating any halt counters as necessary
	 * @param event an incoming {@link Event} */
	public void check(Event event) {
		if (event instanceof ScriptStartedEvent) {
			if (((ScriptStartedEvent) event).page.haltInput) {
				disable();
			}
		} else if (event instanceof ScriptEndedEvent) {
			if (((ScriptEndedEvent) event).page.haltInput) {
				enable();
			}
		} else if (event instanceof SetInputEnabled) {
			if (((SetInputEnabled) event).enabled) {
				enable();
			} else {
				disable();
			}
		}
	}

	private void disable() {
		haltCounter++;
		Game.log("Halting input. counter: " + haltCounter);
		haltInput = true;
	}

	private void enable() {
		haltCounter--;
		Game.log("Updating halt counter: " + haltCounter);
		if (haltCounter <= 0) {
			haltInput = false;
			Game.log("Resuming input");
			haltCounter = 0;
		}
	}

	/** @return whether or not this input is halted */
	public boolean isHalted() {
		return haltInput;
	}
}