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/*
* @(#)HollowLabel.java 7/12/2005
*
* Copyright 2002 - 2005 JIDE Software Inc. All rights reserved.
*/
package com.jidesoft.swing;
import javax.swing.*;
import javax.swing.plaf.FontUIResource;
import javax.swing.plaf.ColorUIResource;
import java.awt.*;
/**
* This is part of the null-components. A null component doesn't have foreground, background or font value set. In the
* other words, the foreground, background and font value of null-component are null. But this doesn't mean
* getBackground(), getForeground() or getFont() will return null. According to {@link
* java.awt.Component#getBackground()}, {@link java.awt.Component#getForeground()} and {@link
* java.awt.Component#getFont()}, if the value is null, it will get the value from its parent. In the other words, if
* you add a null-component to JPanel, you can use JPanel to control the background, foreground and font of this
* null-component. The feature is very helpful if you want to make sure all components in a JPanel has the same
* background, foreground or font.
* <p/>
* Even in null-components, you can still change the foreground, background or font value if you do want. However, you'll
* have to use a font which is not an instance of FontUIResource or a color which is not an instance of ColorUIResource.
* <p/>
* We creates a few null-components. It doesn't cover all components. You can always create your own. All you need to do
* is this
* <pre><code>
* public class NullXxxComponent extends XxxComponent {
* // invoke clearAttribute() in all the constructors
* <p/>
* public void setFont(Font font) {
* if (font instanceof FontUIResource) {
* return;
* }
* super.setFont(font);
* }
* <p/>
* public void setBackground(Color bg) {
* if (bg instanceof ColorUIResource) {
* return;
* }
* super.setBackground(bg);
* }
* <p/>
* public void setForeground(Color fg) {
* if (fg instanceof ColorUIResource) {
* return;
* }
* super.setForeground(fg);
* }
* <p/>
* private void clearAttribute() {
* setFont(null);
* setBackground(null);
* // do not do this for JButton since JButton always paints button
* // content background. So it'd better to leave the foreground alone
* setForeground(null);
* }
* }
* </code></pre>
*
* @see com.jidesoft.swing.NullButton
* @see com.jidesoft.swing.NullCheckBox
* @see com.jidesoft.swing.NullJideButton
* @see com.jidesoft.swing.NullPanel
* @see com.jidesoft.swing.NullRadioButton
* @see com.jidesoft.swing.NullTristateCheckBox
*/
public class NullLabel extends JLabel {
public NullLabel() {
clearAttribute();
}
public NullLabel(String text, Icon icon, int horizontalAlignment) {
super(text, icon, horizontalAlignment);
clearAttribute();
}
public NullLabel(String text, int horizontalAlignment) {
super(text, horizontalAlignment);
clearAttribute();
}
public NullLabel(String text) {
super(text);
clearAttribute();
}
public NullLabel(Icon image, int horizontalAlignment) {
super(image, horizontalAlignment);
clearAttribute();
}
public NullLabel(Icon image) {
super(image);
clearAttribute();
}
private void clearAttribute() {
super.setFont(null);
super.setBackground(null);
super.setForeground(null);
}
@Override
public void setFont(Font font) {
if (font instanceof FontUIResource) {
return;
}
super.setFont(font);
}
@Override
public void setBackground(Color bg) {
if (bg instanceof ColorUIResource) {
return;
}
super.setBackground(bg);
}
@Override
public void setForeground(Color fg) {
if (fg instanceof ColorUIResource) {
return;
}
super.setForeground(fg);
}
}
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