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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.
 * <p>
 * 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.
 * </p>
 * <p>
 * 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.
 * </p>
 * 
 * @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. */
	default boolean isAlwaysActive() {
		return false;
	}

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

	/** The tool's mouse pointer. */
	default MouseCursor getCursor() {
		return MouseCursor.DEFAULT;
	}

	/** Informs the tool that it is now active. */
	default void activate() {
		// do nothing by default
	}

	/** Informs the tool that it is no longer active. */
	default void deactivate() {
		// do nothing by default
	}

	/** Occurs when a key on the keyboard is pressed while the tool is active. */
	@SuppressWarnings("unused")
	default void onKeyDown(final KyPressedEvent evt) {
		// do nothing by default
	}

	/** Occurs when a key on the keyboard is released while the tool is active. */
	@SuppressWarnings("unused")
	default void onKeyUp(final KyReleasedEvent evt) {
		// do nothing by default
	}

	/** Occurs when a mouse button is pressed while the tool is active. */
	@SuppressWarnings("unused")
	default void onMouseDown(final MsPressedEvent evt) {
		// do nothing by default
	}

	/** Occurs when a mouse button is released while the tool is active. */
	@SuppressWarnings("unused")
	default void onMouseUp(final MsReleasedEvent evt) {
		// do nothing by default
	}

	/** Occurs when a mouse button is double clicked while the tool is active. */
	@SuppressWarnings("unused")
	default void onMouseClick(final MsClickedEvent evt) {
		// do nothing by default
	}

	/** Occurs when the mouse is moved while the tool is active. */
	@SuppressWarnings("unused")
	default void onMouseMove(final MsMovedEvent evt) {
		// do nothing by default
	}

	/** Occurs when the mouse is dragged while the tool is active. */
	@SuppressWarnings("unused")
	default void onMouseDrag(final MsDraggedEvent evt) {
		// do nothing by default
	}

	/** Occurs when the mouse wheel is moved while the tool is active. */
	@SuppressWarnings("unused")
	default void onMouseWheel(final MsWheelEvent evt) {
		// do nothing by default
	}

	/** Occurs when the user right clicks this tool's icon. */
	default void configure() {
		// do nothing by default
	}

	/** Returns the text the tool provides when mouse hovers over tool */
	default String getDescription() {
		return getInfo().getDescription();
	}
}
