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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
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 * SciJava Common shared library for SciJava software.
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 * Copyright (C) 2009 - 2016 Board of Regents of the University of
 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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package org.scijava.input;

import java.util.HashSet;

import org.scijava.display.Display;
import org.scijava.display.event.DisplayDeletedEvent;
import org.scijava.display.event.input.KyPressedEvent;
import org.scijava.display.event.input.KyReleasedEvent;
import org.scijava.display.event.input.MsExitedEvent;
import org.scijava.display.event.input.MsMovedEvent;
import org.scijava.display.event.input.MsPressedEvent;
import org.scijava.display.event.input.MsReleasedEvent;
import org.scijava.event.EventHandler;
import org.scijava.event.EventService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.service.AbstractService;
import org.scijava.service.Service;

/**
 * Default implementation of {@link InputService}.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = Service.class)
public class DefaultInputService extends AbstractService implements
	InputService
{

	@Parameter
	private EventService eventService;

	private InputModifiers modifiers;

	private boolean altDown = false;
	private boolean altGrDown = false;
	private boolean ctrlDown = false;
	private boolean metaDown = false;
	private boolean shiftDown = false;

	private HashSet pressedKeys = new HashSet<>();

	private HashSet buttonsDown = new HashSet<>();

	private Display display;
	private int lastX = -1, lastY = -1;

	// -- InputService methods --

	@Override
	public EventService eventService() {
		return eventService;
	}

	@Override
	public InputModifiers getModifiers() {
		return modifiers;
	}

	@Override
	public boolean isAltDown() {
		return altDown;
	}

	@Override
	public boolean isAltGrDown() {
		return altGrDown;
	}

	@Override
	public boolean isCtrlDown() {
		return ctrlDown;
	}

	@Override
	public boolean isMetaDown() {
		return metaDown;
	}

	@Override
	public boolean isShiftDown() {
		return shiftDown;
	}

	@Override
	public boolean isKeyDown(final KeyCode code) {
		return pressedKeys.contains(code);
	}

	@Override
	public Display getDisplay() {
		return display;
	}

	@Override
	public int getX() {
		return lastX;
	}

	@Override
	public int getY() {
		return lastY;
	}

	@Override
	public boolean isButtonDown(final int button) {
		return buttonsDown.contains(button);
	}

	// -- Event handlers --

	@EventHandler
	public void onEvent(final KyPressedEvent evt) {
		modifiers = evt.getModifiers();
		altDown = modifiers.isAltDown();
		altGrDown = modifiers.isAltGrDown();
		ctrlDown = modifiers.isCtrlDown();
		metaDown = modifiers.isMetaDown();
		shiftDown = modifiers.isShiftDown();
		pressedKeys.add(evt.getCode());
	}

	@EventHandler
	public void onEvent(final KyReleasedEvent evt) {
		modifiers = evt.getModifiers();
		altDown = modifiers.isAltDown();
		altGrDown = modifiers.isAltGrDown();
		ctrlDown = modifiers.isCtrlDown();
		metaDown = modifiers.isMetaDown();
		shiftDown = modifiers.isShiftDown();
		pressedKeys.remove(evt.getCode());
	}

	@EventHandler
	protected void onEvent(final MsMovedEvent evt) {
		updateCoords(evt.getDisplay(), evt.getX(), evt.getY());
	}

	@EventHandler
	protected void onEvent(@SuppressWarnings("unused") final MsExitedEvent evt) {
		clearCoords();
	}

	@EventHandler
	protected void onEvent(final MsPressedEvent evt) {
		modifiers = evt.getModifiers();
		buttonsDown.add(evt.getButton());
	}

	@EventHandler
	protected void onEvent(final MsReleasedEvent evt) {
		modifiers = evt.getModifiers();
		buttonsDown.remove(evt.getButton());
	}

	@EventHandler
	protected void onEvent(final DisplayDeletedEvent evt) {
		if (display != evt.getObject()) return;
		clearCoords();
	}

	// -- Helper methods --

	private void updateCoords(final Display d, final int x, final int y) {
		display = d;
		lastX = x;
		lastY = y;
	}

	private void clearCoords() {
		updateCoords(null, -1, -1);
	}

}