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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.display.event;

import org.scijava.display.Display;

/**
 * An event indicating a display has updated; e.g., an object has been added or
 * removed.
 * 
 * @author Grant Harris
 * @author Lee Kamentsky
 */
public class DisplayUpdatedEvent extends DisplayEvent {

	/**
	 * The display update level gives a hint about how much work needs to be done
	 * during the update.
	 */
	public enum DisplayUpdateLevel {

		/**
		 * The data has changed, but the extents and decorations have not.

		 * An example: changing the intensity of a single pixel.
		 */
		UPDATE,

		/**
		 * The extents and decorations have changed.

		 * An example: stretching an image so it's height changes.
		 */
		REBUILD

	}

	private final DisplayUpdateLevel level;

	public DisplayUpdatedEvent(final Display display,
		final DisplayUpdateLevel level)
	{
		super(display);
		this.level = level;
	}

	public DisplayUpdateLevel getLevel() {
		return level;
	}

}