src/java.desktop/share/classes/javax/swing/plaf/metal/MetalDesktopIconUI.java

/*
 * Copyright (c) 1998, 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing.plaf.metal;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.*;
import java.beans.*;
import java.util.EventListener;
import java.io.Serializable;
import javax.swing.plaf.basic.BasicDesktopIconUI;

/**
 * Metal desktop icon.
 *
 * @author Steve Wilson
 */
public class MetalDesktopIconUI extends BasicDesktopIconUI
{

    JButton button;
    JLabel label;
    TitleListener titleListener;
    private int width;

    /**
     * Constructs a new instance of {@code MetalDesktopIconUI}.
     *
     * @param c a component
     * @return a new instance of {@code MetalDesktopIconUI}
     */
    public static ComponentUI createUI(JComponent c)    {
        return new MetalDesktopIconUI();
    }

    /**
     * Constructs a new instance of {@code MetalDesktopIconUI}.
     */
    public MetalDesktopIconUI() {
    }

    protected void installDefaults() {
        super.installDefaults();
        LookAndFeel.installColorsAndFont(desktopIcon, "DesktopIcon.background", "DesktopIcon.foreground", "DesktopIcon.font");
        width = UIManager.getInt("DesktopIcon.width");
    }

    protected void installComponents() {
        frame = desktopIcon.getInternalFrame();
        Icon icon = frame.getFrameIcon();
        String title = frame.getTitle();

        button = new JButton (title, icon);
        button.addActionListener( new ActionListener() {
                                  public void actionPerformed(ActionEvent e) {
             deiconize(); }} );
        button.setFont(desktopIcon.getFont());
        button.setBackground(desktopIcon.getBackground());
        button.setForeground(desktopIcon.getForeground());

        int buttonH = button.getPreferredSize().height;

        Icon drag = new MetalBumps((buttonH/3), buttonH,
                                   MetalLookAndFeel.getControlHighlight(),
                                   MetalLookAndFeel.getControlDarkShadow(),
                                   MetalLookAndFeel.getControl());
        label = new JLabel(drag);

        label.setBorder( new MatteBorder( 0, 2, 0, 1, desktopIcon.getBackground()) );
        desktopIcon.setLayout(new BorderLayout(2, 0));
        desktopIcon.add(button, BorderLayout.CENTER);
        desktopIcon.add(label, BorderLayout.WEST);
    }

    protected void uninstallComponents() {
        desktopIcon.setLayout(null);
        desktopIcon.remove(label);
        desktopIcon.remove(button);
        button = null;
        frame = null;
    }

    protected void installListeners() {
        super.installListeners();
        desktopIcon.getInternalFrame().addPropertyChangeListener(
                titleListener = new TitleListener());
    }

    protected void uninstallListeners() {
        desktopIcon.getInternalFrame().removePropertyChangeListener(
                titleListener);
        titleListener = null;
        super.uninstallListeners();
    }


    public Dimension getPreferredSize(JComponent c) {
        // Metal desktop icons can not be resized.  Their dimensions should
        // always be the minimum size.  See getMinimumSize(JComponent c).
        return getMinimumSize(c);
    }

    public Dimension getMinimumSize(JComponent c) {
        // For the metal desktop icon we will use the layout manager to
        // determine the correct height of the component, but we want to keep
        // the width consistent according to the jlf spec.
        return new Dimension(width,
                desktopIcon.getLayout().minimumLayoutSize(desktopIcon).height);
    }

    public Dimension getMaximumSize(JComponent c) {
        // Metal desktop icons can not be resized.  Their dimensions should
        // always be the minimum size.  See getMinimumSize(JComponent c).
        return getMinimumSize(c);
    }

    class TitleListener implements PropertyChangeListener {
        public void propertyChange (PropertyChangeEvent e) {
          if (e.getPropertyName().equals("title")) {
            button.setText((String)e.getNewValue());
          }

          if (e.getPropertyName().equals("frameIcon")) {
            button.setIcon((Icon)e.getNewValue());
          }
        }
    }
}