1 /*

     2  * CDDL HEADER START

     3  *

     4  * The contents of this file are subject to the terms of the

     5  * Common Development and Distribution License (the "License").

     6  * You may not use this file except in compliance with the License.

     7  *

     8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

     9  * or http://www.opensolaris.org/os/licensing.

    10  * See the License for the specific language governing permissions

    11  * and limitations under the License.

    12  *

    13  * When distributing Covered Code, include this CDDL HEADER in each

    14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

    15  * If applicable, add the following below this CDDL HEADER, with the

    16  * fields enclosed by brackets "[]" replaced with your own identifying

    17  * information: Portions Copyright [yyyy] [name of copyright owner]

    18  *

    19  * CDDL HEADER END

    20  */

    21 

    22 /*

    23  * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.

    24  */

    25 

    26 package com.oracle.solaris.vp.util.swing;

    27 

    28 import java.beans.*;

    29 import javax.swing.*;

    30 

    31 /**

    32  * The {@code AutoHideLabel} is a {@code JLabel} whose visibility is

    33  * automatically set to {@code false} when its text and icon are {@code null} or

    34  * empty, {@code true} otherwise.

    35  */

    36 @SuppressWarnings({"serial"})

    37 public class AutoHideLabel extends JLabel {

    38     public static class AutoHideListener implements PropertyChangeListener {

    39 	//

    40 	// PropertyChangeListener methods

    41 	//

    42 

    43 	@Override

    44 	public void propertyChange(PropertyChangeEvent event) {

    45 	    setVisible((JLabel)event.getSource());

    46 	}

    47 

    48 	//

    49 	// AutoHideListener methods

    50 	//

    51 

    52 	public void deinit(JLabel label) {

    53 	    label.removePropertyChangeListener("text", this);

    54 	    label.removePropertyChangeListener("icon", this);

    55 	}

    56 

    57 	public void init(JLabel label) {

    58 	    label.addPropertyChangeListener("text", this);

    59 	    label.addPropertyChangeListener("icon", this);

    60 	    setVisible(label);

    61 	}

    62 

    63 	//

    64 	// Private methods

    65 	//

    66 

    67 	/**

    68 	 * Sets the visibility of the given {@code label} based on whether it

    69 	 * has a non-{@code null}/empty icon or text.

    70 	 */

    71 	private void setVisible(JLabel label) {

    72 	    String text = label.getText();

    73 	    label.setVisible((text != null && !text.isEmpty()) ||

    74 		label.getIcon() != null);

    75 	}

    76     }

    77 

    78     //

    79     // Static data

    80     //

    81 

    82     private static final AutoHideListener LISTENER = new AutoHideListener();

    83 

    84     //

    85     // Constructors

    86     //

    87 

    88     public AutoHideLabel() {

    89 	init();

    90     }

    91 

    92     public AutoHideLabel(Icon icon) {

    93 	super(icon);

    94 	init();

    95     }

    96 

    97     public AutoHideLabel(Icon icon, int horizontalAlignment) {

    98 	super(icon, horizontalAlignment);

    99 	init();

   100     }

   101 

   102     public AutoHideLabel(String text) {

   103 	super(text);

   104 	init();

   105     }

   106 

   107     public AutoHideLabel(String text, Icon icon, int horizontalAlignment) {

   108 	super(text, icon, horizontalAlignment);

   109 	init();

   110     }

   111 

   112     public AutoHideLabel(String text, int horizontalAlignment) {

   113 	super(text, horizontalAlignment);

   114 	init();

   115     }

   116 

   117     //

   118     // Private methods

   119     //

   120 

   121     private void init() {

   122 	autoHide(this);

   123     }

   124 

   125     //

   126     // Static methods

   127     //

   128 

   129     /**

   130      * Add an {@link AutoHideListener} to the given {@code JLabel} to

   131      * automatically set its visibility whenever its text or icon properties

   132      * change.

   133      *

   134      * @return	    the added {@link AutoHideListener}

   135      */

   136     public static AutoHideListener autoHide(JLabel label) {

   137 	LISTENER.init(label);

   138 	return LISTENER;

   139     }

   140 }