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JavaFX on-screen keyboard Swing support module.
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package org.comtel2000.swing.robot;

/*
 * #%L
 * fx-onscreen-keyboard
 * %%
 * Copyright (C) 2014 - 2015 comtel2000
 * %%
 * 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.
 * 
 * 3. Neither the name of the comtel2000 nor the names of its contributors
 *    may be used to endorse or promote products derived from this software without
 *    specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

import static java.awt.event.InputEvent.CTRL_DOWN_MASK;
import static java.awt.event.InputEvent.META_DOWN_MASK;
import static java.awt.event.InputEvent.SHIFT_DOWN_MASK;
import static java.awt.event.KeyEvent.KEY_LOCATION_STANDARD;
import static java.awt.event.KeyEvent.KEY_LOCATION_UNKNOWN;
import static java.awt.event.KeyEvent.KEY_PRESSED;
import static java.awt.event.KeyEvent.KEY_RELEASED;
import static java.awt.event.KeyEvent.KEY_TYPED;
import static java.awt.event.KeyEvent.VK_UNDEFINED;

import java.awt.Component;
import java.awt.KeyboardFocusManager;
import java.awt.event.KeyEvent;

import javax.swing.SwingUtilities;

import org.comtel2000.keyboard.robot.IRobot;
import org.slf4j.LoggerFactory;

public class AWTRobotHandler implements IRobot {

	private final static org.slf4j.Logger logger = LoggerFactory.getLogger(AWTRobotHandler.class);

	private final int controlDownMask;

	public AWTRobotHandler() {
		String osName = System.getProperty("os.name");
		if (osName.toLowerCase().startsWith("mac")) {
			controlDownMask = META_DOWN_MASK;
		} else {
			controlDownMask = CTRL_DOWN_MASK;
		}
	}

	@Override
	public void sendToComponent(Object source, final char ch, final boolean ctrl) {
		logger.trace("fire: {}", ch);
		SwingUtilities.invokeLater(() -> send(ch, ctrl));
	}

	private void send(char ch, boolean ctrl) {
		Component c = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
		if (c == null || !c.isEnabled()) {
			logger.warn("no awt focus owner");
			return;
		}

		KeyboardFocusManager kfm = KeyboardFocusManager.getCurrentKeyboardFocusManager();

		if (ctrl) {
			switch (ch) {
			case java.awt.event.KeyEvent.VK_ENTER:
			case java.awt.event.KeyEvent.VK_BACK_SPACE:
			case java.awt.event.KeyEvent.VK_DELETE:
			case java.awt.event.KeyEvent.VK_ESCAPE:
			case java.awt.event.KeyEvent.VK_SPACE:
			case java.awt.event.KeyEvent.VK_TAB:
			case java.awt.event.KeyEvent.VK_UP:
			case java.awt.event.KeyEvent.VK_DOWN:
			case java.awt.event.KeyEvent.VK_LEFT:
			case java.awt.event.KeyEvent.VK_RIGHT:
			case java.awt.event.KeyEvent.VK_UNDO:
			case java.awt.event.KeyEvent.VK_AGAIN:
				kfm.dispatchKeyEvent(new KeyEvent(c, KEY_PRESSED, System.currentTimeMillis(), 0, ch, ch, KEY_LOCATION_STANDARD));
				kfm.dispatchKeyEvent(new KeyEvent(c, KEY_RELEASED, System.currentTimeMillis(), 0, ch, ch, KEY_LOCATION_STANDARD));
				return;
			}

			int keycode = KeyEvent.getExtendedKeyCodeForChar(ch);
			if (keycode != KeyEvent.VK_UNDEFINED) {
				kfm.dispatchKeyEvent(new KeyEvent(c, KEY_PRESSED, System.currentTimeMillis(), controlDownMask, keycode, ch, KEY_LOCATION_STANDARD));
				kfm.dispatchKeyEvent(new KeyEvent(c, KEY_RELEASED, System.currentTimeMillis(), controlDownMask, keycode, ch, KEY_LOCATION_STANDARD));
				return;
			}
		}

		int modififiers = Character.isUpperCase(ch) ? SHIFT_DOWN_MASK : 0;

		kfm.dispatchKeyEvent(new KeyEvent(c, KEY_PRESSED, System.currentTimeMillis(), modififiers, VK_UNDEFINED, ch, KEY_LOCATION_STANDARD));
		kfm.dispatchKeyEvent(new KeyEvent(c, KEY_TYPED, System.currentTimeMillis(), modififiers, VK_UNDEFINED, ch, KEY_LOCATION_UNKNOWN));
		kfm.dispatchKeyEvent(new KeyEvent(c, KEY_RELEASED, System.currentTimeMillis(), modififiers, VK_UNDEFINED, ch, KEY_LOCATION_STANDARD));

	}

}