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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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package org.scijava.ui.dnd;

import java.io.File;

import org.scijava.display.Display;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;
import org.scijava.script.ScriptService;

/**
 * Drag-and-drop handler for script files.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = DragAndDropHandler.class)
public class ScriptFileDragAndDropHandler extends
	AbstractDragAndDropHandler
{

	@Parameter(required = false)
	private ScriptService scriptService;

	// -- DragAndDropHandler methods --

	@Override
	public boolean drop(final File file, final Display display) {
		if (scriptService == null) return false;
		check(file, display);
		if (file == null) return true; // trivial case

		// TODO: Use the script service to open the file in the script editor.
		// We may also want to be context sensitive about which type of display
		// received the drop:
		// - If it's the main window, open a new Script Editor window.
		// - If it's an existing Script Editor window, open a new tab.
		// -- This will require the Script Editor windows to be Displays.
		// - Should a drop onto any other displays do anything?

		return true;
	}

	// -- Typed methods --

	@Override
	public boolean supports(final File file) {
		if (scriptService == null) return false;
		if (!super.supports(file)) return false;

		// verify that the file is a script
		return scriptService.canHandleFile(file);
	}

	@Override
	public Class getType() {
		return File.class;
	}

}