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 * Copyright (c) 1998, 2014, 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.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Rectangle;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import javax.swing.JButton;

import javax.swing.JComponent;

import javax.swing.JScrollBar;

import javax.swing.UIManager;

import javax.swing.plaf.ComponentUI;

import javax.swing.plaf.basic.BasicScrollBarUI;

import static sun.swing.SwingUtilities2.drawHLine;

import static sun.swing.SwingUtilities2.drawRect;

import static sun.swing.SwingUtilities2.drawVLine;

/**

 * Implementation of ScrollBarUI for the Metal Look and Feel

 *

 * @author Tom Santos

 * @author Steve Wilson

 */

public class MetalScrollBarUI extends BasicScrollBarUI

{

    private static Color shadowColor;

    private static Color highlightColor;

    private static Color darkShadowColor;

    private static Color thumbColor;

    private static Color thumbShadow;

    private static Color thumbHighlightColor;

    protected MetalBumps bumps;

    protected MetalScrollButton increaseButton;

    protected MetalScrollButton decreaseButton;

    protected  int scrollBarWidth;

    public static final String FREE_STANDING_PROP = "JScrollBar.isFreeStanding";

    protected boolean isFreeStanding = true;

    public static ComponentUI createUI( JComponent c )

    {

        return new MetalScrollBarUI();

    }

    protected void installDefaults() {

        scrollBarWidth = ((Integer)(UIManager.get( "ScrollBar.width" ))).intValue();

        super.installDefaults();

        bumps = new MetalBumps( 10, 10, thumbHighlightColor, thumbShadow, thumbColor );

    }

    protected void installListeners(){

        super.installListeners();

        ((ScrollBarListener)propertyChangeListener).handlePropertyChange( scrollbar.getClientProperty( FREE_STANDING_PROP ) );

    }

    protected PropertyChangeListener createPropertyChangeListener(){

        return new ScrollBarListener();

    }

    protected void configureScrollBarColors()

    {

        super.configureScrollBarColors();

        shadowColor         = UIManager.getColor("ScrollBar.shadow");

        highlightColor      = UIManager.getColor("ScrollBar.highlight");

        darkShadowColor     = UIManager.getColor("ScrollBar.darkShadow");

        thumbColor          = UIManager.getColor("ScrollBar.thumb");

        thumbShadow         = UIManager.getColor("ScrollBar.thumbShadow");

        thumbHighlightColor = UIManager.getColor("ScrollBar.thumbHighlight");

    }

    public Dimension getPreferredSize( JComponent c )

    {

        if ( scrollbar.getOrientation() == JScrollBar.VERTICAL )

        {

            return new Dimension( scrollBarWidth, scrollBarWidth * 3 + 10 );

        }

        else  // Horizontal

        {

            return new Dimension( scrollBarWidth * 3 + 10, scrollBarWidth );

        }

    }

    /** Returns the view that represents the decrease view.

      */

    protected JButton createDecreaseButton( int orientation )

    {

        decreaseButton = new MetalScrollButton( orientation, scrollBarWidth, isFreeStanding );

        return decreaseButton;

    }

    /** Returns the view that represents the increase view. */

    protected JButton createIncreaseButton( int orientation )

    {

        increaseButton =  new MetalScrollButton( orientation, scrollBarWidth, isFreeStanding );

        return increaseButton;

    }

    protected void paintTrack( Graphics g, JComponent c, Rectangle trackBounds )

    {

        g.translate( trackBounds.x, trackBounds.y );

        boolean leftToRight = MetalUtils.isLeftToRight(c);

        if ( scrollbar.getOrientation() == JScrollBar.VERTICAL )

        {

            if ( !isFreeStanding ) {

                trackBounds.width += 2;

                if ( !leftToRight ) {

                    g.translate( -1, 0 );

                }

            }

            if ( c.isEnabled() ) {

                g.setColor( darkShadowColor );

                drawVLine(g, 0, 0, trackBounds.height - 1);

                drawVLine(g, trackBounds.width - 2, 0, trackBounds.height - 1);

                drawHLine(g, 2, trackBounds.width - 1, trackBounds.height - 1);

                drawHLine(g, 2, trackBounds.width - 2, 0);

                g.setColor( shadowColor );

                //      g.setColor( Color.red);

                drawVLine(g, 1, 1, trackBounds.height - 2);

                drawHLine(g, 1, trackBounds.width - 3, 1);

                if (scrollbar.getValue() != scrollbar.getMaximum()) {  // thumb shadow

                    int y = thumbRect.y + thumbRect.height - trackBounds.y;

                    drawHLine(g, 1, trackBounds.width - 1, y);

                }

                g.setColor(highlightColor);

                drawVLine(g, trackBounds.width - 1, 0, trackBounds.height - 1);

            } else {

                MetalUtils.drawDisabledBorder(g, 0, 0, trackBounds.width, trackBounds.height );

            }

            if ( !isFreeStanding ) {

                trackBounds.width -= 2;

                if ( !leftToRight ) {

                    g.translate( 1, 0 );

                }

            }

        }

        else  // HORIZONTAL

        {

            if ( !isFreeStanding ) {

                trackBounds.height += 2;

            }

            if ( c.isEnabled() ) {

                g.setColor( darkShadowColor );

                drawHLine(g, 0, trackBounds.width - 1, 0);  // top

                drawVLine(g, 0, 2, trackBounds.height - 2); // left

                drawHLine(g, 0, trackBounds.width - 1, trackBounds.height - 2 ); // bottom

                drawVLine(g, trackBounds.width - 1, 2,  trackBounds.height - 1 ); // right

                g.setColor( shadowColor );

                //      g.setColor( Color.red);

                drawHLine(g, 1, trackBounds.width - 2, 1 );  // top

                drawVLine(g, 1, 1, trackBounds.height - 3 ); // left

                drawHLine(g, 0, trackBounds.width - 1, trackBounds.height - 1 ); // bottom

                if (scrollbar.getValue() != scrollbar.getMaximum()) {  // thumb shadow

                    int x = thumbRect.x + thumbRect.width - trackBounds.x;

                    drawVLine(g, x, 1, trackBounds.height-1);

                }

            } else {

                MetalUtils.drawDisabledBorder(g, 0, 0, trackBounds.width, trackBounds.height );

            }

            if ( !isFreeStanding ) {

                trackBounds.height -= 2;

            }

        }

        g.translate( -trackBounds.x, -trackBounds.y );

    }

    protected void paintThumb( Graphics g, JComponent c, Rectangle thumbBounds )

    {

        if (!c.isEnabled()) {

            return;

        }

        if (MetalLookAndFeel.usingOcean()) {

            oceanPaintThumb(g, c, thumbBounds);

            return;

        }

        boolean leftToRight = MetalUtils.isLeftToRight(c);

        g.translate( thumbBounds.x, thumbBounds.y );

        if ( scrollbar.getOrientation() == JScrollBar.VERTICAL )

        {

            if ( !isFreeStanding ) {

                thumbBounds.width += 2;

                if ( !leftToRight ) {

                    g.translate( -1, 0 );

                }

            }

            g.setColor( thumbColor );

            g.fillRect( 0, 0, thumbBounds.width - 2, thumbBounds.height - 1 );

            g.setColor( thumbShadow );

            drawRect(g, 0, 0, thumbBounds.width - 2, thumbBounds.height - 1);

            g.setColor( thumbHighlightColor );

            drawHLine(g, 1, thumbBounds.width - 3, 1);

            drawVLine(g, 1, 1, thumbBounds.height - 2);

            bumps.setBumpArea( thumbBounds.width - 6, thumbBounds.height - 7 );

            bumps.paintIcon( c, g, 3, 4 );

            if ( !isFreeStanding ) {

                thumbBounds.width -= 2;

                if ( !leftToRight ) {

                    g.translate( 1, 0 );

                }

            }

        }

        else  // HORIZONTAL

        {

            if ( !isFreeStanding ) {

                thumbBounds.height += 2;

            }

            g.setColor( thumbColor );

            g.fillRect( 0, 0, thumbBounds.width - 1, thumbBounds.height - 2 );

            g.setColor( thumbShadow );

            drawRect(g, 0, 0, thumbBounds.width - 1, thumbBounds.height - 2);

            g.setColor( thumbHighlightColor );

            drawHLine(g, 1, thumbBounds.width - 3, 1);

            drawVLine(g, 1, 1, thumbBounds.height - 3);

            bumps.setBumpArea( thumbBounds.width - 7, thumbBounds.height - 6 );

            bumps.paintIcon( c, g, 4, 3 );

            if ( !isFreeStanding ) {

                thumbBounds.height -= 2;

            }

        }

        g.translate( -thumbBounds.x, -thumbBounds.y );

    }

    private void oceanPaintThumb(Graphics g, JComponent c,

                                   Rectangle thumbBounds) {

        boolean leftToRight = MetalUtils.isLeftToRight(c);

        g.translate(thumbBounds.x, thumbBounds.y);

        if (scrollbar.getOrientation() == JScrollBar.VERTICAL) {

            if (!isFreeStanding) {

                thumbBounds.width += 2;

                if (!leftToRight) {

                    g.translate(-1, 0);

                }

            }

            if (thumbColor != null) {

                g.setColor(thumbColor);

                g.fillRect(0, 0, thumbBounds.width - 2,thumbBounds.height - 1);

            }

            g.setColor(thumbShadow);

            drawRect(g, 0, 0, thumbBounds.width - 2, thumbBounds.height - 1);

            g.setColor(thumbHighlightColor);

            drawHLine(g, 1, thumbBounds.width - 3, 1);

            drawVLine(g, 1, 1, thumbBounds.height - 2);

            MetalUtils.drawGradient(c, g, "ScrollBar.gradient", 2, 2,

                                    thumbBounds.width - 4,

                                    thumbBounds.height - 3, false);

            int gripSize = thumbBounds.width - 8;

            if (gripSize > 2 && thumbBounds.height >= 10) {

                g.setColor(MetalLookAndFeel.getPrimaryControlDarkShadow());

                int gripY = thumbBounds.height / 2 - 2;

                for (int counter = 0; counter < 6; counter += 2) {

                    g.fillRect(4, counter + gripY, gripSize, 1);

                }

                g.setColor(MetalLookAndFeel.getWhite());

                gripY++;

                for (int counter = 0; counter < 6; counter += 2) {

                    g.fillRect(5, counter + gripY, gripSize, 1);

                }

            }

            if (!isFreeStanding) {

                thumbBounds.width -= 2;

                if (!leftToRight) {

                    g.translate(1, 0);

                }

            }

        }

        else { // HORIZONTAL

            if (!isFreeStanding) {

                thumbBounds.height += 2;

            }

            if (thumbColor != null) {

                g.setColor(thumbColor);

                g.fillRect(0, 0, thumbBounds.width - 1,thumbBounds.height - 2);

            }

            g.setColor(thumbShadow);

            drawRect(g, 0, 0, thumbBounds.width - 1, thumbBounds.height - 2);

            g.setColor(thumbHighlightColor);

            drawHLine(g, 1, thumbBounds.width - 2, 1);

            drawVLine(g, 1, 1, thumbBounds.height - 3);

            MetalUtils.drawGradient(c, g, "ScrollBar.gradient", 2, 2,

                                    thumbBounds.width - 3,

                                    thumbBounds.height - 4, true);

            int gripSize = thumbBounds.height - 8;

            if (gripSize > 2 && thumbBounds.width >= 10) {

                g.setColor(MetalLookAndFeel.getPrimaryControlDarkShadow());

                int gripX = thumbBounds.width / 2 - 2;

                for (int counter = 0; counter < 6; counter += 2) {

                    g.fillRect(gripX + counter, 4, 1, gripSize);

                }

                g.setColor(MetalLookAndFeel.getWhite());

                gripX++;

                for (int counter = 0; counter < 6; counter += 2) {

                    g.fillRect(gripX + counter, 5, 1, gripSize);

                }

            }

            if (!isFreeStanding) {

                thumbBounds.height -= 2;

            }

        }

        g.translate( -thumbBounds.x, -thumbBounds.y );

    }

    protected Dimension getMinimumThumbSize()

    {

        return new Dimension( scrollBarWidth, scrollBarWidth );

    }

    /**

      * This is overridden only to increase the invalid area.  This

      * ensures that the "Shadow" below the thumb is invalidated

      */

    protected void setThumbBounds(int x, int y, int width, int height)

    {

        /* If the thumbs bounds haven't changed, we're done.

         */

        if ((thumbRect.x == x) &&

            (thumbRect.y == y) &&

            (thumbRect.width == width) &&

            (thumbRect.height == height)) {

            return;

        }

        /* Update thumbRect, and repaint the union of x,y,w,h and

         * the old thumbRect.

         */

        int minX = Math.min(x, thumbRect.x);

        int minY = Math.min(y, thumbRect.y);

        int maxX = Math.max(x + width, thumbRect.x + thumbRect.width);

        int maxY = Math.max(y + height, thumbRect.y + thumbRect.height);

        thumbRect.setBounds(x, y, width, height);

        scrollbar.repaint(minX, minY, (maxX - minX)+1, (maxY - minY)+1);

    }

    class ScrollBarListener extends BasicScrollBarUI.PropertyChangeHandler

    {

        public void propertyChange(PropertyChangeEvent e)

        {

            String name = e.getPropertyName();

            if ( name.equals( FREE_STANDING_PROP ) )

            {

                handlePropertyChange( e.getNewValue() );

            }

            else {

                super.propertyChange( e );

            }

        }

        public void handlePropertyChange( Object newValue )

        {

            if ( newValue != null )

            {

                boolean temp = ((Boolean)newValue).booleanValue();

                boolean becameFlush = temp == false && isFreeStanding == true;

                boolean becameNormal = temp == true && isFreeStanding == false;

                isFreeStanding = temp;

                if ( becameFlush ) {

                    toFlush();

                }

                else if ( becameNormal ) {

                    toFreeStanding();

                }

            }

            else

            {

                if ( !isFreeStanding ) {

                    isFreeStanding = true;

                    toFreeStanding();

                }

                // This commented-out block is used for testing flush scrollbars.

/*

                if ( isFreeStanding ) {

                    isFreeStanding = false;

                    toFlush();

                }

*/

            }

            if ( increaseButton != null )

            {

                increaseButton.setFreeStanding( isFreeStanding );

            }

            if ( decreaseButton != null )

            {

                decreaseButton.setFreeStanding( isFreeStanding );

            }

        }

        protected void toFlush() {

            scrollBarWidth -= 2;

        }

        protected void toFreeStanding() {

            scrollBarWidth += 2;

        }

    } // end class ScrollBarListener

}