/*
 * @(#)WindowsComboBoxUI.java	1.28 00/09/28
 *
 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

package com.sun.java.swing.plaf.windows;

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


/**
 * Windows combo box.
 * <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.  A future release of Swing will provide support for
 * long term persistence.
 *
 * @version 1.28, 09/28/00
 * @author Tom Santos
 */

public class WindowsComboBoxUI extends BasicComboBoxUI {
    private static final JTextField sizer = new JTextField();

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

    public void installUI( JComponent c ) {
        super.installUI( c );
        comboBox.setRequestFocusEnabled( true );
    }
    
    public Dimension getMinimumSize( JComponent c ) {
        if ( !isMinimumSizeDirty ) {
            return new Dimension( cachedMinimumSize );
        }
        
        Dimension size = getDisplaySize();
        Insets insets = getInsets();
        
        if ( comboBox.getRenderer() instanceof UIResource ) {
            sizer.setFont( comboBox.getFont() );
            size.height = sizer.getPreferredSize().height;
        }
        else {
            size.height += insets.top + insets.bottom;
        }
        
        int buttonSize = size.height - (insets.top + insets.bottom);
        size.width +=  insets.left + insets.right + buttonSize;

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

        return size;
    }

    protected void installKeyboardActions() {
        super.installKeyboardActions();
        ActionMap map = (ActionMap)UIManager.get("ComboBox.actionMap");
        if (map != null) {
            map.put("selectPrevious", new UpAction());
            map.put("selectNext", new DownAction());
        }
    }

    protected ComboPopup createPopup() {
        return new WindowsComboPopup( comboBox );
    }

    /** 
     * Subclassed to add Windows specific Key Bindings.
     * This class is now obsolete and doesn't do anything. 
     * Only included for backwards API compatibility.
     * Do not call or override.
     * 
     * @deprecated As of Java 2 platform v1.4.
     */
    protected class WindowsComboPopup extends BasicComboPopup {

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

        protected KeyListener createKeyListener() {
            return new InvocationKeyHandler();
        }

        protected class InvocationKeyHandler extends BasicComboPopup.InvocationKeyHandler {
        }
    }


    static class DownAction extends AbstractAction {
	public void actionPerformed(ActionEvent e) {
	    JComboBox comboBox = (JComboBox)e.getSource();
	    if ( comboBox.isEnabled() ) {
		WindowsComboBoxUI ui = (WindowsComboBoxUI)comboBox.getUI();
		if ( !comboBox.isEditable() || (comboBox.isEditable() &&
						ui.isPopupVisible(comboBox))) {
		    ui.selectNextPossibleValue();
		}
	    }
	}
    }


    static class UpAction extends AbstractAction {
	public void actionPerformed(ActionEvent e) {
	    JComboBox comboBox = (JComboBox)e.getSource();
	    if ( comboBox.isEnabled() ) {
		WindowsComboBoxUI ui = (WindowsComboBoxUI)comboBox.getUI();
		if ( !comboBox.isEditable() || (comboBox.isEditable() &&
        					ui.isPopupVisible(comboBox))) {
		    ui.selectPreviousPossibleValue();
		}
	    }
	}
    }
}