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	/*
	* Copyright (c) 1997, 2008, 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 com.sun.java.swing.plaf.windows;

	import java.awt.*;
	import java.awt.event.*;
	import java.awt.image.*;
	import java.lang.ref.*;
	import java.util.*;
	import javax.swing.plaf.basic.*;
	import javax.swing.*;
	import javax.swing.plaf.ComponentUI;

	import static com.sun.java.swing.plaf.windows.TMSchema.*;
	import static com.sun.java.swing.plaf.windows.XPStyle.Skin;


	/**
	* Windows rendition of the component.
	* <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.
	*/
	public class WindowsScrollBarUI extends BasicScrollBarUI {
	private Grid thumbGrid;
	private Grid highlightGrid;
	private Dimension horizontalThumbSize;
	private Dimension verticalThumbSize;

	/**
	* Creates a UI for a JScrollBar.
	*
	* @param c the text field
	* @return the UI
	*/
	public static ComponentUI createUI(JComponent c) {
	return new WindowsScrollBarUI();
	}

	protected void installDefaults() {
	super.installDefaults();

	XPStyle xp = XPStyle.getXP();
	if (xp != null) {
	scrollbar.setBorder(null);
	horizontalThumbSize = getSize(scrollbar, xp, Part.SBP_THUMBBTNHORZ);
	verticalThumbSize = getSize(scrollbar, xp, Part.SBP_THUMBBTNVERT);
	} else {
	horizontalThumbSize = null;
	verticalThumbSize = null;
	}
	}

	private static Dimension getSize(Component component, XPStyle xp, Part part) {
	Skin skin = xp.getSkin(component, part);
	return new Dimension(skin.getWidth(), skin.getHeight());
	}

	@Override
	protected Dimension getMinimumThumbSize() {
	if ((horizontalThumbSize == null) \|\| (verticalThumbSize == null)) {
	return super.getMinimumThumbSize();
	}
	return JScrollBar.HORIZONTAL == scrollbar.getOrientation()
	? horizontalThumbSize
	: verticalThumbSize;
	}

	public void uninstallUI(JComponent c) {
	super.uninstallUI(c);
	thumbGrid = highlightGrid = null;
	}

	protected void configureScrollBarColors() {
	super.configureScrollBarColors();
	Color color = UIManager.getColor("ScrollBar.trackForeground");
	if (color != null && trackColor != null) {
	thumbGrid = Grid.getGrid(color, trackColor);
	}

	color = UIManager.getColor("ScrollBar.trackHighlightForeground");
	if (color != null && trackHighlightColor != null) {
	highlightGrid = Grid.getGrid(color, trackHighlightColor);
	}
	}

	protected JButton createDecreaseButton(int orientation) {
	return new WindowsArrowButton(orientation,
	UIManager.getColor("ScrollBar.thumb"),
	UIManager.getColor("ScrollBar.thumbShadow"),
	UIManager.getColor("ScrollBar.thumbDarkShadow"),
	UIManager.getColor("ScrollBar.thumbHighlight"));
	}

	protected JButton createIncreaseButton(int orientation) {
	return new WindowsArrowButton(orientation,
	UIManager.getColor("ScrollBar.thumb"),
	UIManager.getColor("ScrollBar.thumbShadow"),
	UIManager.getColor("ScrollBar.thumbDarkShadow"),
	UIManager.getColor("ScrollBar.thumbHighlight"));
	}

	/**
	* {@inheritDoc}
	* @since 1.6
	*/
	@Override
	protected ArrowButtonListener createArrowButtonListener(){
	// we need to repaint the entire scrollbar because state change for each
	// button causes a state change for the thumb and other button on Vista
	if(XPStyle.isVista()) {
	return new ArrowButtonListener() {
	public void mouseEntered(MouseEvent evt) {
	repaint();
	super.mouseEntered(evt);
	}
	public void mouseExited(MouseEvent evt) {
	repaint();
	super.mouseExited(evt);
	}
	private void repaint() {
	scrollbar.repaint();
	}
	};
	} else {
	return super.createArrowButtonListener();
	}
	}

	protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds){
	boolean v = (scrollbar.getOrientation() == JScrollBar.VERTICAL);

	XPStyle xp = XPStyle.getXP();
	if (xp != null) {
	JScrollBar sb = (JScrollBar)c;
	State state = State.NORMAL;
	// Pending: Implement rollover (hot) and pressed
	if (!sb.isEnabled()) {
	state = State.DISABLED;
	}
	Part part = v ? Part.SBP_LOWERTRACKVERT : Part.SBP_LOWERTRACKHORZ;
	xp.getSkin(sb, part).paintSkin(g, trackBounds, state);
	} else if (thumbGrid == null) {
	super.paintTrack(g, c, trackBounds);
	}
	else {
	thumbGrid.paint(g, trackBounds.x, trackBounds.y, trackBounds.width,
	trackBounds.height);
	if (trackHighlight == DECREASE_HIGHLIGHT) {
	paintDecreaseHighlight(g);
	}
	else if (trackHighlight == INCREASE_HIGHLIGHT) {
	paintIncreaseHighlight(g);
	}
	}
	}

	protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
	boolean v = (scrollbar.getOrientation() == JScrollBar.VERTICAL);

	XPStyle xp = XPStyle.getXP();
	if (xp != null) {
	JScrollBar sb = (JScrollBar)c;
	State state = State.NORMAL;
	if (!sb.isEnabled()) {
	state = State.DISABLED;
	} else if (isDragging) {
	state = State.PRESSED;
	} else if (isThumbRollover()) {
	state = State.HOT;
	} else if (XPStyle.isVista()) {
	if ((incrButton != null && incrButton.getModel().isRollover()) \|\|
	(decrButton != null && decrButton.getModel().isRollover())) {
	state = State.HOVER;
	}
	}
	// Paint thumb
	Part thumbPart = v ? Part.SBP_THUMBBTNVERT : Part.SBP_THUMBBTNHORZ;
	xp.getSkin(sb, thumbPart).paintSkin(g, thumbBounds, state);
	// Paint gripper
	Part gripperPart = v ? Part.SBP_GRIPPERVERT : Part.SBP_GRIPPERHORZ;
	Skin skin = xp.getSkin(sb, gripperPart);
	Insets gripperInsets = xp.getMargin(c, thumbPart, null, Prop.CONTENTMARGINS);
	if (gripperInsets == null \|\|
	(v && (thumbBounds.height - gripperInsets.top -
	gripperInsets.bottom >= skin.getHeight())) \|\|
	(!v && (thumbBounds.width - gripperInsets.left -
	gripperInsets.right >= skin.getWidth()))) {
	skin.paintSkin(g,
	thumbBounds.x + (thumbBounds.width - skin.getWidth()) / 2,
	thumbBounds.y + (thumbBounds.height - skin.getHeight()) / 2,
	skin.getWidth(), skin.getHeight(), state);
	}
	} else {
	super.paintThumb(g, c, thumbBounds);
	}
	}


	protected void paintDecreaseHighlight(Graphics g) {
	if (highlightGrid == null) {
	super.paintDecreaseHighlight(g);
	}
	else {
	Insets insets = scrollbar.getInsets();
	Rectangle thumbR = getThumbBounds();
	int x, y, w, h;

	if (scrollbar.getOrientation() == JScrollBar.VERTICAL) {
	x = insets.left;
	y = decrButton.getY() + decrButton.getHeight();
	w = scrollbar.getWidth() - (insets.left + insets.right);
	h = thumbR.y - y;
	}
	else {
	x = decrButton.getX() + decrButton.getHeight();
	y = insets.top;
	w = thumbR.x - x;
	h = scrollbar.getHeight() - (insets.top + insets.bottom);
	}
	highlightGrid.paint(g, x, y, w, h);
	}
	}


	protected void paintIncreaseHighlight(Graphics g) {
	if (highlightGrid == null) {
	super.paintDecreaseHighlight(g);
	}
	else {
	Insets insets = scrollbar.getInsets();
	Rectangle thumbR = getThumbBounds();
	int x, y, w, h;

	if (scrollbar.getOrientation() == JScrollBar.VERTICAL) {
	x = insets.left;
	y = thumbR.y + thumbR.height;
	w = scrollbar.getWidth() - (insets.left + insets.right);
	h = incrButton.getY() - y;
	}
	else {
	x = thumbR.x + thumbR.width;
	y = insets.top;
	w = incrButton.getX() - x;
	h = scrollbar.getHeight() - (insets.top + insets.bottom);
	}
	highlightGrid.paint(g, x, y, w, h);
	}
	}


	/**
	* {@inheritDoc}
	* @since 1.6
	*/
	@Override
	protected void setThumbRollover(boolean active) {
	boolean old = isThumbRollover();
	super.setThumbRollover(active);
	// we need to repaint the entire scrollbar because state change for thumb
	// causes state change for incr and decr buttons on Vista
	if(XPStyle.isVista() && active != old) {
	scrollbar.repaint();
	}
	}

	/**
	* WindowsArrowButton is used for the buttons to position the
	* document up/down. It differs from BasicArrowButton in that the
	* preferred size is always a square.
	*/
	private class WindowsArrowButton extends BasicArrowButton {

	public WindowsArrowButton(int direction, Color background, Color shadow,
	Color darkShadow, Color highlight) {
	super(direction, background, shadow, darkShadow, highlight);
	}

	public WindowsArrowButton(int direction) {
	super(direction);
	}

	public void paint(Graphics g) {
	XPStyle xp = XPStyle.getXP();
	if (xp != null) {
	ButtonModel model = getModel();
	Skin skin = xp.getSkin(this, Part.SBP_ARROWBTN);
	State state = null;

	boolean jointRollover = XPStyle.isVista() && (isThumbRollover() \|\|
	(this == incrButton && decrButton.getModel().isRollover()) \|\|
	(this == decrButton && incrButton.getModel().isRollover()));

	// normal, rollover, pressed, disabled
	if (model.isArmed() && model.isPressed()) {
	switch (direction) {
	case NORTH: state = State.UPPRESSED; break;
	case SOUTH: state = State.DOWNPRESSED; break;
	case WEST: state = State.LEFTPRESSED; break;
	case EAST: state = State.RIGHTPRESSED; break;
	}
	} else if (!model.isEnabled()) {
	switch (direction) {
	case NORTH: state = State.UPDISABLED; break;
	case SOUTH: state = State.DOWNDISABLED; break;
	case WEST: state = State.LEFTDISABLED; break;
	case EAST: state = State.RIGHTDISABLED; break;
	}
	} else if (model.isRollover() \|\| model.isPressed()) {
	switch (direction) {
	case NORTH: state = State.UPHOT; break;
	case SOUTH: state = State.DOWNHOT; break;
	case WEST: state = State.LEFTHOT; break;
	case EAST: state = State.RIGHTHOT; break;
	}
	} else if (jointRollover) {
	switch (direction) {
	case NORTH: state = State.UPHOVER; break;
	case SOUTH: state = State.DOWNHOVER; break;
	case WEST: state = State.LEFTHOVER; break;
	case EAST: state = State.RIGHTHOVER; break;
	}
	} else {
	switch (direction) {
	case NORTH: state = State.UPNORMAL; break;
	case SOUTH: state = State.DOWNNORMAL; break;
	case WEST: state = State.LEFTNORMAL; break;
	case EAST: state = State.RIGHTNORMAL; break;
	}
	}

	skin.paintSkin(g, 0, 0, getWidth(), getHeight(), state);
	} else {
	super.paint(g);
	}
	}

	public Dimension getPreferredSize() {
	int size = 16;
	if (scrollbar != null) {
	switch (scrollbar.getOrientation()) {
	case JScrollBar.VERTICAL:
	size = scrollbar.getWidth();
	break;
	case JScrollBar.HORIZONTAL:
	size = scrollbar.getHeight();
	break;
	}
	size = Math.max(size, 5);
	}
	return new Dimension(size, size);
	}
	}


	/**
	* This should be pulled out into its own class if more classes need to
	* use it.
	* <p>
	* Grid is used to draw the track for windows scrollbars. Grids
	* are cached in a HashMap, with the key being the rgb components
	* of the foreground/background colors. Further the Grid is held through
	* a WeakRef so that it can be freed when no longer needed. As the
	* Grid is rather expensive to draw, it is drawn in a BufferedImage.
	*/
	private static class Grid {
	private static final int BUFFER_SIZE = 64;
	private static HashMap<String, WeakReference<Grid>> map;

	private BufferedImage image;

	static {
	map = new HashMap<String, WeakReference<Grid>>();
	}

	public static Grid getGrid(Color fg, Color bg) {
	String key = fg.getRGB() + " " + bg.getRGB();
	WeakReference<Grid> ref = map.get(key);
	Grid grid = (ref == null) ? null : ref.get();
	if (grid == null) {
	grid = new Grid(fg, bg);
	map.put(key, new WeakReference<Grid>(grid));
	}
	return grid;
	}

	public Grid(Color fg, Color bg) {
	int cmap[] = { fg.getRGB(), bg.getRGB() };
	IndexColorModel icm = new IndexColorModel(8, 2, cmap, 0, false, -1,
	DataBuffer.TYPE_BYTE);
	image = new BufferedImage(BUFFER_SIZE, BUFFER_SIZE,
	BufferedImage.TYPE_BYTE_INDEXED, icm);
	Graphics g = image.getGraphics();
	try {
	g.setClip(0, 0, BUFFER_SIZE, BUFFER_SIZE);
	paintGrid(g, fg, bg);
	}
	finally {
	g.dispose();
	}
	}

	/**
	* Paints the grid into the specified Graphics at the specified
	* location.
	*/
	public void paint(Graphics g, int x, int y, int w, int h) {
	Rectangle clipRect = g.getClipBounds();
	int minX = Math.max(x, clipRect.x);
	int minY = Math.max(y, clipRect.y);
	int maxX = Math.min(clipRect.x + clipRect.width, x + w);
	int maxY = Math.min(clipRect.y + clipRect.height, y + h);

	if (maxX <= minX \|\| maxY <= minY) {
	return;
	}
	int xOffset = (minX - x) % 2;
	for (int xCounter = minX; xCounter < maxX;
	xCounter += BUFFER_SIZE) {
	int yOffset = (minY - y) % 2;
	int width = Math.min(BUFFER_SIZE - xOffset,
	maxX - xCounter);

	for (int yCounter = minY; yCounter < maxY;
	yCounter += BUFFER_SIZE) {
	int height = Math.min(BUFFER_SIZE - yOffset,
	maxY - yCounter);

	g.drawImage(image, xCounter, yCounter,
	xCounter + width, yCounter + height,
	xOffset, yOffset,
	xOffset + width, yOffset + height, null);
	if (yOffset != 0) {
	yCounter -= yOffset;
	yOffset = 0;
	}
	}
	if (xOffset != 0) {
	xCounter -= xOffset;
	xOffset = 0;
	}
	}
	}

	/**
	* Actually renders the grid into the Graphics <code>g</code>.
	*/
	private void paintGrid(Graphics g, Color fg, Color bg) {
	Rectangle clipRect = g.getClipBounds();
	g.setColor(bg);
	g.fillRect(clipRect.x, clipRect.y, clipRect.width,
	clipRect.height);
	g.setColor(fg);
	g.translate(clipRect.x, clipRect.y);
	int width = clipRect.width;
	int height = clipRect.height;
	int xCounter = clipRect.x % 2;
	for (int end = width - height; xCounter < end; xCounter += 2) {
	g.drawLine(xCounter, 0, xCounter + height, height);
	}
	for (int end = width; xCounter < end; xCounter += 2) {
	g.drawLine(xCounter, 0, width, width - xCounter);
	}

	int yCounter = ((clipRect.x % 2) == 0) ? 2 : 1;
	for (int end = height - width; yCounter < end; yCounter += 2) {
	g.drawLine(0, yCounter, width, yCounter + width);
	}
	for (int end = height; yCounter < end; yCounter += 2) {
	g.drawLine(0, yCounter, height - yCounter, height);
	}
	g.translate(-clipRect.x, -clipRect.y);
	}
	}
	}

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