com.lowagie.rups.view.RupsMenuBar Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of pdf-swing Show documentation
There is a newer version: 2.2.2
/*
 * $Id: RupsMenuBar.java 4039 2009-07-24 10:29:47Z blowagie $
 *
 * Copyright 2007 Bruno Lowagie.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

package com.lowagie.rups.view;

import com.lowagie.rups.io.FileChooserAction;
import com.lowagie.rups.io.FileCloseAction;
import com.lowagie.rups.io.filters.PdfFilter;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Observable;
import java.util.Observer;
import javax.swing.Box;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

public class RupsMenuBar extends JMenuBar implements Observer {

    /**
     * Caption for the file menu.
     */
    public static final String FILE_MENU = "File";
    /**
     * Caption for "Open file".
     */
    public static final String OPEN = "Open";
    /**
     * Caption for "Close file".
     */
    public static final String CLOSE = "Close";
    /**
     * Caption for the help menu.
     */
    public static final String HELP_MENU = "Help";
    /**
     * Caption for "Help about".
     */
    public static final String ABOUT = "About";
    /**
     * Caption for "Help versions".
     *
     * @since iText 5.0.0 (renamed from VERSIONS)
     */
    public static final String VERSION = "Version";
    /**
     * A Serial Version UID.
     */
    private static final long serialVersionUID = 6403040037592308742L;
    /**
     * The Observable object.
     */
    protected Observable observable;
    /**
     * The action needed to open a file.
     */
    protected FileChooserAction fileChooserAction;
    /**
     * The HashMap with all the actions.
     */
    protected HashMap items;

    /**
     * Creates a JMenuBar.
     *
     * @param observable the controller to which this menu bar is added
     */
    public RupsMenuBar(Observable observable) {
        this.observable = observable;
        items = new HashMap<>();
        fileChooserAction = new FileChooserAction(observable, "Open", PdfFilter.INSTANCE, false);
        MessageAction message = new MessageAction();
        JMenu file = new JMenu(FILE_MENU);
        addItem(file, OPEN, fileChooserAction);
        addItem(file, CLOSE, new FileCloseAction(observable));
        add(file);
        add(Box.createGlue());
        JMenu help = new JMenu(HELP_MENU);
        addItem(help, ABOUT, message);
        addItem(help, VERSION, message);
        add(help);
        enableItems(false);
    }

    /**
     * @see java.util.Observer#update(java.util.Observable, java.lang.Object)
     */
    public void update(Observable observable, Object obj) {
        if (OPEN.equals(obj)) {
            enableItems(true);
            return;
        }
        if (CLOSE.equals(obj)) {
            enableItems(false);
            return;
        }
        if (FILE_MENU.equals(obj)) {
            fileChooserAction.actionPerformed(null);
        }
    }

    /**
     * Create an item with a certain caption and a certain action, then add the item to a menu.
     *
     * @param menu    the menu to which the item has to be added
     * @param caption the caption of the item
     * @param action  the action corresponding with the caption
     */
    protected void addItem(JMenu menu, String caption, ActionListener action) {
        JMenuItem item = new JMenuItem(caption);
        item.addActionListener(action);
        menu.add(item);
        items.put(caption, item);
    }

    /**
     * Enables/Disables a series of menu items.
     *
     * @param enabled true for enabling; false for disabling
     */
    protected void enableItems(boolean enabled) {
        enableItem(CLOSE, enabled);
    }

    /**
     * Enables/disables a specific menu item
     *
     * @param caption the caption of the item that needs to be enabled/disabled
     * @param enabled true for enabling; false for disabling
     */
    protected void enableItem(String caption, boolean enabled) {
        items.get(caption).setEnabled(enabled);
    }
}