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Java example source code file (MetalComboBoxUI.java)

This example Java source code file (MetalComboBoxUI.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

awt, bean, color, container, deprecated, dimension, event, graphics, gui, insets, jbutton, jcomponent, metalcomboboxbutton, metalcomboboxlayoutmanager, metalcombopopup, must, nullpointerexception, plaf, rectangle, swing

The MetalComboBoxUI.java Java example source code

/*
 * Copyright (c) 1998, 2013, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.swing.plaf.metal;

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


/**
 * Metal UI for JComboBox
 * <p>
 * <strong>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 <code>java.beans package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @see MetalComboBoxEditor
 * @see MetalComboBoxButton
 * @author Tom Santos
 */
public class MetalComboBoxUI extends BasicComboBoxUI {

    public static ComponentUI createUI(JComponent c) {
        return new MetalComboBoxUI();
    }

    public void paint(Graphics g, JComponent c) {
        if (MetalLookAndFeel.usingOcean()) {
            super.paint(g, c);
        }
    }

    /**
     * If necessary paints the currently selected item.
     *
     * @param g Graphics to paint to
     * @param bounds Region to paint current value to
     * @param hasFocus whether or not the JComboBox has focus
     * @throws NullPointerException if any of the arguments are null.
     * @since 1.5
     */
    public void paintCurrentValue(Graphics g, Rectangle bounds,
                                  boolean hasFocus) {
        // This is really only called if we're using ocean.
        if (MetalLookAndFeel.usingOcean()) {
            bounds.x += 2;
            bounds.width -= 3;
            if (arrowButton != null) {
                Insets buttonInsets = arrowButton.getInsets();
                bounds.y += buttonInsets.top;
                bounds.height -= (buttonInsets.top + buttonInsets.bottom);
            }
            else {
                bounds.y += 2;
                bounds.height -= 4;
            }
            super.paintCurrentValue(g, bounds, hasFocus);
        }
        else if (g == null || bounds == null) {
            throw new NullPointerException(
                "Must supply a non-null Graphics and Rectangle");
        }
    }

    /**
     * If necessary paints the background of the currently selected item.
     *
     * @param g Graphics to paint to
     * @param bounds Region to paint background to
     * @param hasFocus whether or not the JComboBox has focus
     * @throws NullPointerException if any of the arguments are null.
     * @since 1.5
     */
    public void paintCurrentValueBackground(Graphics g, Rectangle bounds,
                                            boolean hasFocus) {
        // This is really only called if we're using ocean.
        if (MetalLookAndFeel.usingOcean()) {
            g.setColor(MetalLookAndFeel.getControlDarkShadow());
            g.drawRect(bounds.x, bounds.y, bounds.width, bounds.height - 1);
            g.setColor(MetalLookAndFeel.getControlShadow());
            g.drawRect(bounds.x + 1, bounds.y + 1, bounds.width - 2,
                       bounds.height - 3);
            if (hasFocus && !isPopupVisible(comboBox) &&
                    arrowButton != null) {
                g.setColor(listBox.getSelectionBackground());
                Insets buttonInsets = arrowButton.getInsets();
                if (buttonInsets.top > 2) {
                    g.fillRect(bounds.x + 2, bounds.y + 2, bounds.width - 3,
                               buttonInsets.top - 2);
                }
                if (buttonInsets.bottom > 2) {
                    g.fillRect(bounds.x + 2, bounds.y + bounds.height -
                               buttonInsets.bottom, bounds.width - 3,
                               buttonInsets.bottom - 2);
                }
            }
        }
        else if (g == null || bounds == null) {
            throw new NullPointerException(
                "Must supply a non-null Graphics and Rectangle");
        }
    }

    /**
     * Returns the baseline.
     *
     * @throws NullPointerException {@inheritDoc}
     * @throws IllegalArgumentException {@inheritDoc}
     * @see javax.swing.JComponent#getBaseline(int, int)
     * @since 1.6
     */
    public int getBaseline(JComponent c, int width, int height) {
        int baseline;
        if (MetalLookAndFeel.usingOcean() && height >= 4) {
            height -= 4;
            baseline = super.getBaseline(c, width, height);
            if (baseline >= 0) {
                baseline += 2;
            }
        }
        else {
            baseline = super.getBaseline(c, width, height);
        }
        return baseline;
    }

    protected ComboBoxEditor createEditor() {
        return new MetalComboBoxEditor.UIResource();
    }

    protected ComboPopup createPopup() {
        return super.createPopup();
    }

    protected JButton createArrowButton() {
        boolean iconOnly = (comboBox.isEditable() ||
                            MetalLookAndFeel.usingOcean());
        JButton button = new MetalComboBoxButton( comboBox,
                                                  new MetalComboBoxIcon(),
                                                  iconOnly,
                                                  currentValuePane,
                                                  listBox );
        button.setMargin( new Insets( 0, 1, 1, 3 ) );
        if (MetalLookAndFeel.usingOcean()) {
            // Disabled rollover effect.
            button.putClientProperty(MetalBorders.NO_BUTTON_ROLLOVER,
                                     Boolean.TRUE);
        }
        updateButtonForOcean(button);
        return button;
    }

    /**
     * Resets the necessary state on the ComboBoxButton for ocean.
     */
    private void updateButtonForOcean(JButton button) {
        if (MetalLookAndFeel.usingOcean()) {
            // Ocean renders the focus in a different way, this
            // would be redundant.
            button.setFocusPainted(comboBox.isEditable());
        }
    }

    public PropertyChangeListener createPropertyChangeListener() {
        return new MetalPropertyChangeListener();
    }

    /**
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of {@code MetalComboBoxUI}.
     */
    public class MetalPropertyChangeListener extends BasicComboBoxUI.PropertyChangeHandler {
        public void propertyChange(PropertyChangeEvent e) {
            super.propertyChange( e );
            String propertyName = e.getPropertyName();

            if ( propertyName == "editable" ) {
                if(arrowButton instanceof MetalComboBoxButton) {
                            MetalComboBoxButton button = (MetalComboBoxButton)arrowButton;
                            button.setIconOnly( comboBox.isEditable() ||
                                    MetalLookAndFeel.usingOcean() );
                }
                        comboBox.repaint();
                updateButtonForOcean(arrowButton);
            } else if ( propertyName == "background" ) {
                Color color = (Color)e.getNewValue();
                arrowButton.setBackground(color);
                listBox.setBackground(color);

            } else if ( propertyName == "foreground" ) {
                Color color = (Color)e.getNewValue();
                arrowButton.setForeground(color);
                listBox.setForeground(color);
            }
        }
    }

    /**
     * As of Java 2 platform v1.4 this method is no longer used. Do not call or
     * override. All the functionality of this method is in the
     * MetalPropertyChangeListener.
     *
     * @deprecated As of Java 2 platform v1.4.
     */
    @Deprecated
    protected void editablePropertyChanged( PropertyChangeEvent e ) { }

    protected LayoutManager createLayoutManager() {
        return new MetalComboBoxLayoutManager();
    }

    /**
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of {@code MetalComboBoxUI}.
     */
    public class MetalComboBoxLayoutManager extends BasicComboBoxUI.ComboBoxLayoutManager {
        public void layoutContainer( Container parent ) {
            layoutComboBox( parent, this );
        }
        public void superLayout( Container parent ) {
            super.layoutContainer( parent );
        }
    }

    // This is here because of a bug in the compiler.
    // When a protected-inner-class-savvy compiler comes out we
    // should move this into MetalComboBoxLayoutManager.
    public void layoutComboBox( Container parent, MetalComboBoxLayoutManager manager ) {
        if (comboBox.isEditable() && !MetalLookAndFeel.usingOcean()) {
            manager.superLayout( parent );
            return;
        }

        if (arrowButton != null) {
            if (MetalLookAndFeel.usingOcean() ) {
                Insets insets = comboBox.getInsets();
                int buttonWidth = arrowButton.getMinimumSize().width;
                arrowButton.setBounds(MetalUtils.isLeftToRight(comboBox)
                                ? (comboBox.getWidth() - insets.right - buttonWidth)
                                : insets.left,
                            insets.top, buttonWidth,
                            comboBox.getHeight() - insets.top - insets.bottom);
            }
            else {
                Insets insets = comboBox.getInsets();
                int width = comboBox.getWidth();
                int height = comboBox.getHeight();
                arrowButton.setBounds( insets.left, insets.top,
                                       width - (insets.left + insets.right),
                                       height - (insets.top + insets.bottom) );
            }
        }

        if (editor != null && MetalLookAndFeel.usingOcean()) {
            Rectangle cvb = rectangleForCurrentValue();
            editor.setBounds(cvb);
        }
    }

    /**
     * As of Java 2 platform v1.4 this method is no
     * longer used.
     *
     * @deprecated As of Java 2 platform v1.4.
     */
    @Deprecated
    protected void removeListeners() {
        if ( propertyChangeListener != null ) {
            comboBox.removePropertyChangeListener( propertyChangeListener );
        }
    }

    // These two methods were overloaded and made public. This was probably a
    // mistake in the implementation. The functionality that they used to
    // provide is no longer necessary and should be removed. However,
    // removing them will create an uncompatible API change.

    public void configureEditor() {
        super.configureEditor();
    }

    public void unconfigureEditor() {
        super.unconfigureEditor();
    }

    public Dimension getMinimumSize( JComponent c ) {
        if ( !isMinimumSizeDirty ) {
            return new Dimension( cachedMinimumSize );
        }

        Dimension size = null;

        if ( !comboBox.isEditable() &&
             arrowButton != null) {
            Insets buttonInsets = arrowButton.getInsets();
            Insets insets = comboBox.getInsets();

            size = getDisplaySize();
            size.width += insets.left + insets.right;
            size.width += buttonInsets.right;
            size.width += arrowButton.getMinimumSize().width;
            size.height += insets.top + insets.bottom;
            size.height += buttonInsets.top + buttonInsets.bottom;
        }
        else if ( comboBox.isEditable() &&
                  arrowButton != null &&
                  editor != null ) {
            size = super.getMinimumSize( c );
            Insets margin = arrowButton.getMargin();
            size.height += margin.top + margin.bottom;
            size.width += margin.left + margin.right;
        }
        else {
            size = super.getMinimumSize( c );
        }

        cachedMinimumSize.setSize( size.width, size.height );
        isMinimumSizeDirty = false;

        return new Dimension( cachedMinimumSize );
    }

    /**
     * This class should be treated as a "protected" inner class.
     * Instantiate it only within subclasses of {@code MetalComboBoxUI}.
     *
     * This class is now obsolete and doesn't do anything and
     * is only included for backwards API compatibility. Do not call or
     * override.
     *
     * @deprecated As of Java 2 platform v1.4.
     */
    @Deprecated
    public class MetalComboPopup extends BasicComboPopup {

        public MetalComboPopup( JComboBox cBox) {
            super( cBox );
        }

        // This method was overloaded and made public. This was probably
        // mistake in the implementation. The functionality that they used to
        // provide is no longer necessary and should be removed. However,
        // removing them will create an uncompatible API change.

        public void delegateFocus(MouseEvent e) {
            super.delegateFocus(e);
        }
    }
}

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