EventListener.java

package ij.plugin;
import ij.*;
import ij.gui.Toolbar;

/** This plugin implements the Plugins/Utilities/Monitor Events command.
	By implementing the IJEventListener, CommandListenerand ImageLister
	interfaces, it is able to monitor foreground and background color changes,
	tool switches, Log window closings, command executions and image
	window openings, closings and updates.
*/
public class EventListener implements PlugIn, IJEventListener, ImageListener, CommandListener {

	public void run(String arg) {
		IJ.addEventListener(this);
		Executer.addCommandListener(this);
		ImagePlus.addImageListener(this);
		IJ.log("EventListener started");
	}
	
	public void eventOccurred(int eventID) {
		switch (eventID) {
			case IJEventListener.FOREGROUND_COLOR_CHANGED:
				String c = Integer.toHexString(Toolbar.getForegroundColor().getRGB());
				c = "#"+c.substring(2);
				IJ.log("Changed foreground color to "+c);
				break;
			case IJEventListener.BACKGROUND_COLOR_CHANGED:
				c = Integer.toHexString(Toolbar.getBackgroundColor().getRGB());
				c = "#"+c.substring(2);
				IJ.log("Changed background color to "+c);
				break;
			case IJEventListener.TOOL_CHANGED:
				String name = IJ.getToolName();
				IJ.log("Switched to the "+name+(name.endsWith("Tool")?"":" tool"));
				break;
			case IJEventListener.COLOR_PICKER_CLOSED:
				IJ.log("Color picker closed");
				break;
			case IJEventListener.LOG_WINDOW_CLOSED:
				IJ.removeEventListener(this);
				Executer.removeCommandListener(this);
				ImagePlus.removeImageListener(this);
				IJ.showStatus("Log window closed; EventListener stopped");
				break;
		}
	}

	// called when an image is opened
	public void imageOpened(ImagePlus imp) {
		IJ.log("Opened \""+imp.getTitle()+"\"");
	}

	// Called when an image is closed
	public void imageClosed(ImagePlus imp) {
		IJ.log("Closed \""+imp.getTitle()+"\"");
	}

	// Called when an image's pixel data is updated
	public void imageUpdated(ImagePlus imp) {
		IJ.log("Updated \""+imp.getTitle()+"\"");
	}
	
	public String commandExecuting(String command) {
		IJ.log("Executed \""+command+"\" command");
		return command;
	}

}