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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.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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package org.scijava.ui.viewer;

import org.scijava.display.Display;
import org.scijava.display.event.DisplayActivatedEvent;
import org.scijava.display.event.DisplayCreatedEvent;
import org.scijava.display.event.DisplayDeletedEvent;
import org.scijava.display.event.DisplayUpdatedEvent;
import org.scijava.display.event.DisplayUpdatedEvent.DisplayUpdateLevel;
import org.scijava.event.EventHandler;
import org.scijava.plugin.AbstractRichPlugin;

/**
 * The AbstractDisplayViewer provides some basic generic implementations for a
 * DisplayViewer such as storing and providing the display, window and panel for
 * a DisplayViewer.
 * 
 * @author Lee Kamentsky
 * @author Curtis Rueden
 */
public abstract class AbstractDisplayViewer extends AbstractRichPlugin
	implements DisplayViewer
{

	private Display display;
	private DisplayWindow window;
	private DisplayPanel panel;

	@Override
	public void view(final DisplayWindow w, final Display d) {
		if (!canView(d)) {
			throw new IllegalArgumentException("Incompatible display: " + d);
		}
		@SuppressWarnings("unchecked")
		final Display typedDisplay = (Display) d;
		display = typedDisplay;
		window = w;
	}

	@Override
	public Display getDisplay() {
		return display;
	}

	@Override
	public DisplayWindow getWindow() {
		return window;
	}

	@Override
	public void setPanel(final DisplayPanel panel) {
		this.panel = panel;
	}

	@Override
	public DisplayPanel getPanel() {
		return panel;
	}

	@Override
	public void onDisplayDeletedEvent(final DisplayDeletedEvent e) {
		getPanel().getWindow().close();
	}

	@Override
	public void onDisplayUpdatedEvent(final DisplayUpdatedEvent e) {
		if (e.getLevel() == DisplayUpdateLevel.REBUILD) {
			getPanel().redoLayout();
		}
		getPanel().redraw();
	}

	@Override
	public void onDisplayActivatedEvent(final DisplayActivatedEvent e) {
		getPanel().getWindow().requestFocus();
	}

	// -- Disposable methods --

	@Override
	public void dispose() {
		final DisplayWindow w = getWindow();
		if (w != null) w.close();
	}

	// -- Internal AbstractDisplayViewer methods --

	protected void updateTitle() {
		String name = getDisplay().getName();
		if (name == null) name = "";
		getWindow().setTitle(name);
	}

	// -- Event handlers --

	@EventHandler
	protected void onEvent(final DisplayCreatedEvent event) {
		if (event.getObject() != getDisplay()) return;
		updateTitle();
	}

	@EventHandler
	protected void onEvent(final DisplayUpdatedEvent event) {
		if (event.getDisplay() != getDisplay()) return;
		updateTitle();
	}

}