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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 - 2014 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
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package org.scijava.ui;

import java.io.File;

import org.scijava.Disposable;
import org.scijava.display.Display;
import org.scijava.plugin.Plugin;
import org.scijava.plugin.RichPlugin;
import org.scijava.ui.viewer.DisplayWindow;
import org.scijava.widget.FileWidget;

/**
 * An end-user ImageJ application user interface.
 * 
 * UIs discoverable at runtime must implement this interface and be annotated
 * with @{@link Plugin} with attribute {@link Plugin#type()} =
 * {@link UserInterface}.class. While it possible to create a UI merely by
 * implementing this interface, it is encouraged to instead extend
 * {@link AbstractUserInterface}, for convenience.
 * 
 * 
 * @author Curtis Rueden
 * @see Plugin
 * @see UIService
 */
public interface UserInterface extends RichPlugin, Disposable {

	/**
	 * Shows the UI.
	 * 
	 * Note that the actual UI components are created lazily when this method is
	 * called, rather then upon the UI's initial construction.
	 * 
	 */
	void show();

	/** Whether this UI is visible onscreen. */
	boolean isVisible();

	/** Shows the object onscreen using an appropriate UI widget. */
	void show(Object o);

	/**
	 * Shows the object onscreen using an appropriate UI widget.
	 * 
	 * @param name The name to use when displaying the object.
	 * @param o The object to be displayed.
	 */
	void show(String name, Object o);

	/** Shows the display onscreen using an appropriate UI widget. */
	void show(Display display);

	/** Gets the desktop, for use with multi-document interfaces (MDI). */
	Desktop getDesktop();

	/** Gets the main ImageJ application frame, or null if not applicable. */
	ApplicationFrame getApplicationFrame();

	/** Gets the main ImageJ toolbar, or null if not applicable. */
	ToolBar getToolBar();

	/** Gets the main ImageJ status bar, or null if not applicable. */
	StatusBar getStatusBar();

	/** Gets the system clipboard associated with this UI. */
	SystemClipboard getSystemClipboard();

	/** Creates a new display window housing the given display. */
	DisplayWindow createDisplayWindow(Display display);

	/**
	 * Creates a dialog prompter.
	 * 
	 * @param message The message in the dialog itself.
	 * @param title The title of the dialog.
	 * @param messageType The type of message. This typically is rendered as an
	 *          icon next to the message. For example,
	 *          {@link DialogPrompt.MessageType#WARNING_MESSAGE} typically appears
	 *          as an exclamation point.
	 * @param optionType The choices available when dismissing the dialog. These
	 *          choices are typically rendered as buttons for the user to click.
	 * @return The newly created DialogPrompt object.
	 */
	DialogPrompt dialogPrompt(String message, String title,
		DialogPrompt.MessageType messageType, DialogPrompt.OptionType optionType);

	/**
	 * Prompts the user to choose a file.
	 * 
	 * @param file The initial value displayed in the file chooser prompt.
	 * @param style The style of chooser to use:
	 *          
	 *          {@link FileWidget#OPEN_STYLE}
	 *          {@link FileWidget#SAVE_STYLE}
	 *          {@link FileWidget#DIRECTORY_STYLE}
	 *          
	 */
	File chooseFile(File file, String style);

	/**
	 * Displays a popup context menu for the given display at the specified
	 * position.
	 */
	void showContextMenu(String menuRoot, Display display, int x, int y);

	/** Persists the application frame's current location. */
	void saveLocation();

	/** Restores the application frame's current location. */
	void restoreLocation();

	/** Returns true if this UI requires the EDT. */
	boolean requiresEDT();

}