windowsscrollbarui.java

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/*
 * @(#)WindowsScrollBarUI.java	1.25 06/08/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

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;

    /**
     * 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();

	if (XPStyle.getXP() != null) {
	    scrollbar.setBorder(null);
	}
    }

    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);