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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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/*
 * #%L
 * SciJava Common shared library for SciJava software.
 * %%
 * Copyright (C) 2009 - 2015 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.
 * 
 * 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 HOLDERS 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%
 */

package org.scijava.tool;

import org.scijava.display.event.input.KyPressedEvent;
import org.scijava.display.event.input.KyReleasedEvent;
import org.scijava.display.event.input.MsClickedEvent;
import org.scijava.display.event.input.MsDraggedEvent;
import org.scijava.display.event.input.MsMovedEvent;
import org.scijava.display.event.input.MsPressedEvent;
import org.scijava.display.event.input.MsReleasedEvent;
import org.scijava.display.event.input.MsWheelEvent;
import org.scijava.input.MouseCursor;
import org.scijava.plugin.Plugin;
import org.scijava.plugin.RichPlugin;
import org.scijava.plugin.SingletonPlugin;

/**
 * Interface for tools. A tool is a collection of rules binding user input
 * (e.g., keyboard and mouse events) to display and data manipulation in a
 * coherent way.
 * 
 * For example, a {@code PanTool} might pan a display when the mouse is dragged
 * or arrow key is pressed, while a {@code PencilTool} could draw hard lines on
 * the data within a display.
 * 
 * 
 * Tools discoverable at runtime must implement this interface and be annotated
 * with @{@link Plugin} with {@link Plugin#type()} = {@link Tool}.class. While
 * it possible to create a tool merely by implementing this interface, it is
 * encouraged to instead extend {@link AbstractTool}, for convenience.
 * 
 * 
 * @author Rick Lentz
 * @author Grant Harris
 * @author Curtis Rueden
 * @see Plugin
 * @see ToolService
 */
public interface Tool extends RichPlugin, SingletonPlugin {

	/** When true, tool has no button but rather is active all the time. */
	boolean isAlwaysActive();

	/**
	 * When true, tool receives events when the main application frame is active.
	 * When false, tool only receives events when a display window is active.
	 */
	boolean isActiveInAppFrame();

	/** The tool's mouse pointer. */
	MouseCursor getCursor();

	/** Informs the tool that it is now active. */
	void activate();

	/** Informs the tool that it is no longer active. */
	void deactivate();

	/** Occurs when a key on the keyboard is pressed while the tool is active. */
	void onKeyDown(KyPressedEvent event);

	/** Occurs when a key on the keyboard is released while the tool is active. */
	void onKeyUp(KyReleasedEvent event);

	/** Occurs when a mouse button is pressed while the tool is active. */
	void onMouseDown(MsPressedEvent event);

	/** Occurs when a mouse button is released while the tool is active. */
	void onMouseUp(MsReleasedEvent event);

	/** Occurs when a mouse button is double clicked while the tool is active. */
	void onMouseClick(MsClickedEvent event);

	/** Occurs when the mouse is moved while the tool is active. */
	void onMouseMove(MsMovedEvent event);

	/** Occurs when the mouse is dragged while the tool is active. */
	void onMouseDrag(MsDraggedEvent event);

	/** Occurs when the mouse wheel is moved while the tool is active. */
	void onMouseWheel(MsWheelEvent event);

	/** Occurs when the user right clicks this tool's icon. */
	void configure();

	/** Returns the text the tool provides when mouse hovers over tool */
	String getDescription();

}