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  1. #1
    xytho33 is offline Member
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    Default Swing: Change the icon on a JComponent

    Hello,

    I am trying to change the icon in a Swing JComponent using the UIManager. I am executing some example code that I found on the web. Similar code appears in John Zukowski's book, The Definitive Guide to Java Swing, so it appears that it should work. However, when I execute this code, it does not change the icons. Can anyone determine why this code does not work? Thanks!

    Example here:


    package stuffPackage;

    import java.awt.BorderLayout;
    import java.awt.Color;
    import java.io.File;

    import javax.swing.JFrame;
    import javax.swing.JScrollPane;
    import javax.swing.JTree;
    import javax.swing.LookAndFeel;
    import javax.swing.UIDefaults;
    import javax.swing.UIManager;

    public class LazyLoaderTest {
    public static void main(String args[]) {
    JFrame frame = new JFrame("Lazy Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
    String path = "/home/icons/FloppyDrive.gif";
    File iconFile = new File(path);

    //debug
    if(iconFile.exists()) {
    System.out.println(iconFile.getAbsolutePath() + " was found!");
    }
    else {
    System.out.println("iconFile NOT found");
    }

    Object iconObject = LookAndFeel.makeIcon(LazyLoaderTest.class, path);
    UIManager.put("Tree.leafIcon", iconObject);

    Integer fifteen = new Integer(15);
    Object lazyArgs[] = new Object[] { Color.GREEN, Boolean.TRUE, fifteen, fifteen };
    Object lazyDiamond = new UIDefaults.ProxyLazyValue("DiamondIcon", lazyArgs);
    UIManager.put("Tree.openIcon", lazyDiamond);

    JTree tree = new JTree();
    JScrollPane scrollPane = new JScrollPane(tree);

    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(200, 200);
    frame.setVisible(true);
    }
    }


  2. #2
    DarrylBurke's Avatar
    DarrylBurke is offline Forum Police
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    Default

    1. Testing the existence of the file doesn't help, because makeIcon uses getResourceAsStream to load the image. Instead test
    Java Code:
    System.out.println("Path is ok ? " + (LazyLoaderTest.class.getResourceAsStream(path) != null));
    2. Do you have a DiamondIcon class that implements Icon and has a constructor that takes 4 parameters Color, Boolean, int[], int[] ? Even if you do, I'm guessing is won't provide any visible icon with two int arrays in which all the members are zero.

    db

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