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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.  Oracle designates this
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 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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package javax.swing.plaf.metal;

import sun.awt.AppContext;

import javax.swing.*;
import javax.swing.plaf.basic.BasicCheckBoxUI;

import java.awt.*;
import java.awt.event.*;
import javax.swing.plaf.*;
import java.io.Serializable;


CheckboxUI implementation for MetalCheckboxUI

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. 
Author:
Michael C. Albers/**
 * CheckboxUI implementation for MetalCheckboxUI
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Michael C. Albers
 *
 */
@SuppressWarnings("serial") // Same-version serialization only
public class MetalCheckBoxUI extends MetalRadioButtonUI {

    // NOTE: MetalCheckBoxUI inherts from MetalRadioButtonUI instead
    // of BasicCheckBoxUI because we want to pick up all the
    // painting changes made in MetalRadioButtonUI.

    private static final Object METAL_CHECK_BOX_UI_KEY = new Object();

    private static final String propertyPrefix = "CheckBox" + ".";

    private boolean defaults_initialized = false;

    // ********************************
    //         Create PlAF
    // ********************************

    
Returns an instance of MetalCheckBoxUI. 
Params:
b – a component
Returns:
a new instance of MetalCheckBoxUI/**
     * Returns an instance of {@code MetalCheckBoxUI}.
     *
     * @param b a component
     * @return a new instance of {@code MetalCheckBoxUI}
     */
    public static ComponentUI createUI(JComponent b) {
        AppContext appContext = AppContext.getAppContext();
        MetalCheckBoxUI checkboxUI =
                (MetalCheckBoxUI) appContext.get(METAL_CHECK_BOX_UI_KEY);
        if (checkboxUI == null) {
            checkboxUI = new MetalCheckBoxUI();
            appContext.put(METAL_CHECK_BOX_UI_KEY, checkboxUI);
        }
        return checkboxUI;
    }

    public String getPropertyPrefix() {
        return propertyPrefix;
    }

    // ********************************
    //          Defaults
    // ********************************
    public void installDefaults(AbstractButton b) {
        super.installDefaults(b);
        if(!defaults_initialized) {
            icon = UIManager.getIcon(getPropertyPrefix() + "icon");
            defaults_initialized = true;
        }
    }

    protected void uninstallDefaults(AbstractButton b) {
        super.uninstallDefaults(b);
        defaults_initialized = false;
    }

}