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 * Institute of Molecular Cell Biology and Genetics, University of
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package org.scijava.input;

import org.scijava.display.Display;
import org.scijava.display.event.input.MsButtonEvent;
import org.scijava.event.EventService;
import org.scijava.service.SciJavaService;

/**
 * Interface for service that tracks the current status of input devices
 * (keyboard and mouse in particular).
 * 
 * @author Barry DeZonia
 * @author Curtis Rueden
 */
public interface InputService extends SciJavaService {

	default EventService eventService() {
		return context().getService(EventService.class);
	}

	InputModifiers getModifiers();

	boolean isAltDown();

	boolean isAltGrDown();

	boolean isCtrlDown();

	boolean isMetaDown();

	boolean isShiftDown();

	boolean isKeyDown(KeyCode code);

	/**
	 * Gets the display associated with the last observed mouse cursor.
	 * 
	 * @return The display in question, or null if the display has been deleted,
	 *         or the mouse cursor is outside all known displays, or no mouse
	 *         events have ever been observed.
	 */
	Display getDisplay();

	/**
	 * Gets the last observed X coordinate of the mouse cursor, relative to a
	 * specific display.
	 * 
	 * @see #getDisplay()
	 */
	int getX();

	/**
	 * Gets the last observed Y coordinate of the mouse cursor, relative to a
	 * specific display.
	 * 
	 * @see #getDisplay()
	 */
	int getY();

	/**
	 * Gets whether the given mouse button is currently pressed.
	 * 
	 * @param button One of:
	 *          
	 *          {@link MsButtonEvent#LEFT_BUTTON}
	 *          {@link MsButtonEvent#MIDDLE_BUTTON}
	 *          {@link MsButtonEvent#RIGHT_BUTTON}
	 *          
	 */
	boolean isButtonDown(int button);

	// -- Deprecated methods --

	/** @deprecated Use {@link #eventService()} instead. */
	@Deprecated
	default EventService getEventService() {
		return eventService();
	}
}