/*
 * Copyright (c) 2001-2006 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *  o Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer. 
 *     
 *  o Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution. 
 *     
 *  o Neither the name of JGoodies Karsten Lentzsch nor the names of 
 *    its contributors may be used to endorse or promote products derived 
 *    from this software without specific prior written permission. 
 *     
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

package com.jgoodies.looks.plastic;

import java.awt.Component;
import java.awt.Insets;
import java.awt.LayoutManager;

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicSpinnerUI;

import com.jgoodies.looks.common.ExtBasicArrowButtonHandler;
import com.jgoodies.looks.common.ExtBasicSpinnerLayout;


/**
 * The JGoodies Plastic Look&amp;Feel implementation of <code>SpinnerUI</code>.
 * Configures the default editor to adjust font baselines and component
 * bounds. Also, changes the border of the buttons and the size of the arrows. 
 * 
 * @author Karsten Lentzsch
 * @version $Revision: 1.3 $
 */
public class PlasticSpinnerUI extends BasicSpinnerUI {
	
	
	public static ComponentUI createUI(JComponent b) {
		return new PlasticSpinnerUI();
	}


    /**
     * The mouse/action listeners that are added to the spinner's 
     * arrow buttons.  These listeners are shared by all 
     * spinner arrow buttons.
     * 
     * @see #createNextButton
     * @see #createPreviousButton
     */
    private static final ExtBasicArrowButtonHandler nextButtonHandler     
    							= new ExtBasicArrowButtonHandler("increment", true);
    private static final ExtBasicArrowButtonHandler previousButtonHandler 
    							= new ExtBasicArrowButtonHandler("decrement", false);


    /**
     * Create a component that will replace the spinner models value
     * with the object returned by <code>spinner.getPreviousValue</code>.
     * By default the <code>previousButton</code> is a JButton
     * who's <code>ActionListener</code> updates it's <code>JSpinner</code>
     * ancestors model.  If a previousButton isn't needed (in a subclass)
     * then override this method to return null.
     *
     * @return a component that will replace the spinners model with the
     *     next value in the sequence, or null
     * @see #installUI
     * @see #createNextButton
     */
    protected Component createPreviousButton() {
        return new SpinnerArrowButton(SwingConstants.SOUTH, previousButtonHandler);
    }


    /**
     * Create a component that will replace the spinner models value
     * with the object returned by <code>spinner.getNextValue</code>.
     * By default the <code>nextButton</code> is a JButton
     * who's <code>ActionListener</code> updates it's <code>JSpinner</code>
     * ancestors model.  If a nextButton isn't needed (in a subclass)
     * then override this method to return null.
     *
     * @return a component that will replace the spinners model with the
     *     next value in the sequence, or null
     * @see #installUI
     * @see #createPreviousButton
     */
    protected Component createNextButton() {
        return new SpinnerArrowButton(SwingConstants.NORTH, nextButtonHandler);
    }


    /**
     * Create a <code>LayoutManager</code> that manages the <code>editor</code>,
     * <code>nextButton</code>, and <code>previousButton</code> children
     * of the JSpinner. These three children must be added with a constraint
     * that identifies their role: "Editor", "Next", and "Previous". The
     * default layout manager can handle the absence of any of these children.
     * 
     * @return a LayoutManager for the editor, next button, and previous
     *         button.
     * @see #createNextButton
     * @see #createPreviousButton
     * @see #createEditor
     */
    protected LayoutManager createLayout() {
        return new ExtBasicSpinnerLayout();
    }
    
    
    /**
     * This method is called by installUI to get the editor component
     * of the <code>JSpinner</code>.  By default it just returns 
     * <code>JSpinner.getEditor()</code>.  Subclasses can override
     * <code>createEditor</code> to return a component that contains 
     * the spinner's editor or null, if they're going to handle adding 
     * the editor to the <code>JSpinner</code> in an 
     * <code>installUI</code> override.
     * <p>
     * Typically this method would be overridden to wrap the editor
     * with a container with a custom border, since one can't assume
     * that the editors border can be set directly.  
     * <p>
     * The <code>replaceEditor</code> method is called when the spinners
     * editor is changed with <code>JSpinner.setEditor</code>.  If you've
     * overriden this method, then you'll probably want to override
     * <code>replaceEditor</code> as well.
     * 
     * @return the JSpinners editor JComponent, spinner.getEditor() by default
     * @see #installUI
     * @see #replaceEditor
     * @see JSpinner#getEditor
     */
    protected JComponent createEditor() {
		JComponent editor = spinner.getEditor();
		configureEditorBorder(editor);
		return editor;
    }
    
    /**
     * Called by the <code>PropertyChangeListener</code> when the 
     * <code>JSpinner</code> editor property changes.  It's the responsibility 
     * of this method to remove the old editor and add the new one.  By
     * default this operation is just:
     * <pre>
     * spinner.remove(oldEditor);
     * spinner.add(newEditor, "Editor");
     * </pre>
     * The implementation of <code>replaceEditor</code> should be coordinated
     * with the <code>createEditor</code> method.
     * 
     * @see #createEditor
     * @see #createPropertyChangeListener
     */
    protected void replaceEditor(JComponent oldEditor, JComponent newEditor) {
		spinner.remove(oldEditor);
		configureEditorBorder(newEditor);
		spinner.add(newEditor, "Editor");
    }
    
    
    /**
     * Sets an empty border with the default text insets.
     */
    private void configureEditorBorder(JComponent editor) {
        if ((editor instanceof JSpinner.DefaultEditor)) {
            JSpinner.DefaultEditor defaultEditor = (JSpinner.DefaultEditor) editor;
            JTextField editorField = defaultEditor.getTextField();
            Insets insets = UIManager.getInsets("Spinner.defaultEditorInsets");
            editorField.setBorder(new EmptyBorder(insets));
        } else if (   (editor instanceof JPanel) 
                && (editor.getBorder() == null)
                && (editor.getComponentCount() > 0)) {
            JComponent editorField = (JComponent) editor.getComponent(0);
            Insets insets = UIManager.getInsets("Spinner.defaultEditorInsets");
            editorField.setBorder(new EmptyBorder(insets));
        }
    }

    /**
     * It differs from its superclass in that it uses the same formula as JDK
     * to calculate the arrow height.
     */
    private static final class SpinnerArrowButton extends PlasticArrowButton {
        private SpinnerArrowButton(int direction,
                ExtBasicArrowButtonHandler handler) {
            super(direction, UIManager.getInt("ScrollBar.width"), true);
            addActionListener(handler);
            addMouseListener(handler);
        }

        protected int calculateArrowHeight(int height, int width) {
            int arrowHeight = Math.min((height - 4) / 3, (width - 4) / 3);
            return Math.max(arrowHeight, 3);
        }
        
        protected int calculateArrowOffset() {
            return 1;
        }
        
        protected boolean isPaintingNorthBottom() {
            return true;
        }
        
   }

}