/*
* Copyright (c) 1997, 2019, 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.basic;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.*;
import java.io.Serializable;
/**
* ComboBox renderer
* <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™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Arnaud Weber
*/
@SuppressWarnings("serial") // Same-version serialization only
public class BasicComboBoxRenderer extends JLabel
implements ListCellRenderer<Object>, Serializable {
/**
* An empty <code>Border</code>. This field might not be used. To change the
* <code>Border</code> used by this renderer directly set it using
* the <code>setBorder</code> method.
*/
protected static Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);
private static final Border SAFE_NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1);
/**
* Constructs a new instance of {@code BasicComboBoxRenderer}.
*/
public BasicComboBoxRenderer() {
super();
setOpaque(true);
setBorder(getNoFocusBorder());
}
private static Border getNoFocusBorder() {
if (System.getSecurityManager() != null) {
return SAFE_NO_FOCUS_BORDER;
} else {
return noFocusBorder;
}
}
public Dimension getPreferredSize() {
Dimension size;
if (this.getText() == null || this.getText().isEmpty()) {
setText( " " );
size = super.getPreferredSize();
setText( "" );
}
else {
size = super.getPreferredSize();
}
return size;
}
@Override
public Component getListCellRendererComponent(JList<?> list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus)
{
/**if (isSelected) {
setBackground(UIManager.getColor("ComboBox.selectionBackground"));
setForeground(UIManager.getColor("ComboBox.selectionForeground"));
} else {
setBackground(UIManager.getColor("ComboBox.background"));
setForeground(UIManager.getColor("ComboBox.foreground"));
}**/
if (isSelected) {
setBackground(list.getSelectionBackground());
setForeground(list.getSelectionForeground());
}
else {
setBackground(list.getBackground());
setForeground(list.getForeground());
}
setFont(list.getFont());
if (value instanceof Icon) {
setIcon((Icon)value);
}
else {
setText((value == null) ? "" : value.toString());
}
return this;
}
/**
* A subclass of BasicComboBoxRenderer that implements UIResource.
* BasicComboBoxRenderer doesn't implement UIResource
* directly so that applications can safely override the
* cellRenderer property with BasicListCellRenderer subclasses.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
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