Java Swing Icon getEmptyIcon()

Description

Returns the ImageIcon for the empty icon.

License

Open Source License

Return

the ImageIcon

Declaration

public static ImageIcon getEmptyIcon() 

Method Source Code

//package com.java2s;
/*//from  w  ww.  ja  v  a 2s. c om
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import javax.swing.ImageIcon;

import java.net.URL;

public class Main {
    /** the empty icon name. */
    public final static String EMPTY_ICON = "empty.gif";

    /**
     * Returns the ImageIcon for the empty icon.
     *
     * @return      the ImageIcon
     */
    public static ImageIcon getEmptyIcon() {
        return getIcon(EMPTY_ICON);
    }

    /**
     * Returns an ImageIcon for the given class.
     *
     * @param cls      the class to get the icon for (gif, png or jpg)
     * @return      the ImageIcon or null if none found
     */
    public static ImageIcon getIcon(Class cls) {
        if (hasImageFile(cls.getName() + ".gif"))
            return getIcon(cls.getName() + ".gif");
        else if (hasImageFile(cls.getName() + ".png"))
            return getIcon(cls.getName() + ".png");
        else if (hasImageFile(cls.getName() + ".jpg"))
            return getIcon(cls.getName() + ".jpg");
        else
            return null;
    }

    /**
     * Returns an ImageIcon from the given name.
     *
     * @param name   the filename without path
     * @return      the ImageIcon or null if not available
     */
    public static ImageIcon getIcon(String name) {
        String filename;

        filename = getImageFilename(name);
        if (filename != null)
            return new ImageIcon(ClassLoader.getSystemClassLoader().getResource(filename));
        else
            return null;
    }

    /**
     * Checks whether the image is available.
     *
     * @param name   the name of the image (filename without path but with
     *          extension)
     * @return      true if image exists
     */
    public static boolean hasImageFile(String name) {
        return (getImageFilename(name) != null);
    }

    /**
     * Adds the path of the images directory to the name of the image.
     *
     * @param name   the name of the image to add the path to
     * @return      the full path of the image
     */
    public static String getImageFilename(String name) {
        String result;
        String dir;
        URL url;

        result = null;

        dir = "com/github/fracpete/screencast4j/images/";
        try {
            url = ClassLoader.getSystemClassLoader().getResource(dir + name);
            if (url != null)
                result = dir + name;
        } catch (Exception e) {
            // ignored
        }

        return result;
    }
}

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8. getIcon(boolean isPressed, Icon baseIcon_)
9. getIcon(Class baseclass, String name)