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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 - 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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package org.scijava.ui.dnd;

import java.util.List;

import org.scijava.display.Display;
import org.scijava.plugin.HandlerService;
import org.scijava.service.SciJavaService;

/**
 * Interface for service that handles drag and drop events.
 * 
 * @author Curtis Rueden
 */
public interface DragAndDropService extends
	HandlerService>, SciJavaService
{

	/**
	 * Checks whether the given {@link DragAndDropData} can be dropped onto the
	 * specified display. A (data, display) pair is deemed compatible if a
	 * compatible handler exists for them.
	 * 
	 * @see DragAndDropHandler
	 */
	boolean supports(DragAndDropData data, Display display);

	/**
	 * Checks whether the given object can be dropped onto the specified display.
	 * An (object, display) pair is deemed compatible if a compatible handler
	 * exists for them.
	 * 
	 * @see DragAndDropHandler
	 */
	boolean supports(Object object, Display display);

	/**
	 * Performs a drag-and-drop operation in the given display with the specified
	 * {@link DragAndDropData}, using the first available compatible handler.
	 * 
	 * @see DragAndDropHandler
	 * @return true if the drop operation was successful
	 * @throws IllegalArgumentException if the display and/or data object are
	 *           unsupported, or are incompatible with one another.
	 */
	boolean drop(DragAndDropData data, Display display);

	/**
	 * Performs a drag-and-drop operation in the given display with the specified
	 * data object, using the first available compatible handler.
	 * 
	 * @see DragAndDropHandler
	 * @return true if the drop operation was successful
	 * @throws IllegalArgumentException if the display and/or data object are
	 *           unsupported, or are incompatible with one another.
	 */
	boolean drop(Object data, Display display);

	/**
	 * Gets the drag-and-drop handler which will be used to handle the given
	 * {@link DragAndDropData} dragged onto the specified display.
	 * 
	 * @return The first compatible drag-and-drop handler, or null if none
	 *         available.
	 */
	DragAndDropHandler getHandler(DragAndDropData data, Display display);

	/**
	 * Gets the drag-and-drop handler which will be used to handle the given
	 * object dragged onto the specified display.
	 * 
	 * @return The first compatible drag-and-drop handler, or null if none
	 *         available.
	 */
	DragAndDropHandler getHandler(Object object, Display display);

	// NB: Javadoc overrides.

	// -- SingletonService methods --

	/**
	 * Gets the list of available drag-and-drop handlers, which are used to
	 * perform drag-and-drop operations.
	 */
	@Override
	List> getInstances();

}