metalsliderui.java

Mobile 应用程序使用 Java Micro Edition (Java ME) 平台

/*
 * @(#)MetalSliderUI.java	1.36 05/11/30
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.plaf.metal;

import javax.swing.plaf.basic.BasicSliderUI;

import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Point;
import java.awt.Insets;
import java.awt.Color;
import java.io.Serializable;
import java.awt.IllegalComponentStateException;
import java.awt.Polygon;
import java.beans.*;

import javax.swing.border.AbstractBorder;

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.*;

/**
 * A Java L&F implementation of SliderUI.  
 * <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.  As of 1.4, support for long term storage
 * of all JavaBeans<sup><font size="-2">TM</font></sup>
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @version 1.36 11/30/05
 * @author Tom Santos
 */
public class MetalSliderUI extends BasicSliderUI {

    protected final int TICK_BUFFER = 4;
    protected boolean filledSlider = false;
    // NOTE: these next three variables are currently unused.
    protected static Color thumbColor;
    protected static Color highlightColor;
    protected static Color darkShadowColor;
    protected static int trackWidth;
    protected static int tickLength;
    
   /**
    * A default horizontal thumb <code>Icon</code>. This field might not be
    * used. To change the <code>Icon</code> used by this delgate directly set it
    * using the <code>Slider.horizontalThumbIcon</code> UIManager property.
    */
    protected static Icon horizThumbIcon;
    
   /**
    * A default vertical thumb <code>Icon</code>. This field might not be
    * used. To change the <code>Icon</code> used by this delgate directly set it
    * using the <code>Slider.verticalThumbIcon</code> UIManager property.
    */
    protected static Icon vertThumbIcon;

    private static Icon SAFE_HORIZ_THUMB_ICON;
    private static Icon SAFE_VERT_THUMB_ICON;


    protected final String SLIDER_FILL = "JSlider.isFilled";

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

    public MetalSliderUI() {
        super( null );
    }

    private static Icon getHorizThumbIcon() {
        if (System.getSecurityManager() != null) {
            return SAFE_HORIZ_THUMB_ICON;
        } else {
            return horizThumbIcon;
        }
    }

    private static Icon getVertThumbIcon() {
        if (System.getSecurityManager() != null) {
            return SAFE_VERT_THUMB_ICON;
        } else {
            return vertThumbIcon;
        }
    }

    public void installUI( JComponent c ) {
        trackWidth = ((Integer)UIManager.get( "Slider.trackWidth" )).intValue();
        tickLength = ((Integer)UIManager.get( "Slider.majorTickLength" )).intValue();
        horizThumbIcon = SAFE_HORIZ_THUMB_ICON =
                UIManager.getIcon( "Slider.horizontalThumbIcon" );
        vertThumbIcon = SAFE_VERT_THUMB_ICON =
                UIManager.getIcon( "Slider.verticalThumbIcon" );

	super.installUI( c );

        thumbColor = UIManager.getColor("Slider.thumb");
        highlightColor = UIManager.getColor("Slider.highlight");
        darkShadowColor = UIManager.getColor("Slider.darkShadow");

        scrollListener.setScrollByBlock( false );

        Object sliderFillProp = c.getClientProperty( SLIDER_FILL );
        if ( sliderFillProp != null ) {
            filledSlider = ((Boolean)sliderFillProp).booleanValue();
        }
    }

    protected PropertyChangeListener createPropertyChangeListener( JSlider slider ) {
        return new MetalPropertyListener();
    }

    protected class MetalPropertyListener extends BasicSliderUI.PropertyChangeHandler {
        public void propertyChange( PropertyChangeEvent e ) {  // listen for slider fill
	    super.propertyChange( e );

	    String name = e.getPropertyName();
	    if ( name.equals( SLIDER_FILL ) ) {
	        if ( e.getNewValue() != null ) {
		    filledSlider = ((Boolean)e.getNewValue()).booleanValue();
		}
		else {
		    filledSlider = false;
		}
	    }
	}
    }

    public void paintThumb(Graphics g)  {
        Rectangle knobBounds = thumbRect;

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

        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            getHorizThumbIcon().paintIcon( slider, g, 0, 0 );
        }
        else {
            getVertThumbIcon().paintIcon( slider, g, 0, 0 );
        }

        g.translate( -knobBounds.x, -knobBounds.y );
    }

    /**
     * If <code>chooseFirst</code>is true, <code>c1</code> is returned,
     * otherwise <code>c2</code>.
     */
    private Color chooseColor(boolean chooseFirst, Color c1, Color c2) {
        if (chooseFirst) {
            return c2;
        }
        return c1;
    }

    /**
     * Returns a rectangle enclosing the track that will be painted.
     */
    private Rectangle getPaintTrackRect() {
        int trackLeft = 0, trackRight = 0, trackTop = 0, trackBottom = 0;
        if (slider.getOrientation() == JSlider.HORIZONTAL) {
            trackBottom = (trackRect.height - 1) - getThumbOverhang();
            trackTop = trackBottom - (getTrackWidth() - 1);
            trackRight = trackRect.width - 1;
        }
        else {
	    if (MetalUtils.isLeftToRight(slider)) {
	        trackLeft = (trackRect.width - getThumbOverhang()) - 
		                                         getTrackWidth();
		trackRight = (trackRect.width - getThumbOverhang()) - 1;
	    }
	    else {
	        trackLeft = getThumbOverhang();
		trackRight = getThumbOverhang() + getTrackWidth() - 1;
	    }
            trackBottom = trackRect.height - 1;
        }
        return new Rectangle(trackRect.x + trackLeft, trackRect.y + trackTop,
                             trackRight - trackLeft, trackBottom - trackTop);
    }

    public void paintTrack(Graphics g)  {
        if (MetalLookAndFeel.usingOcean()) {
            oceanPaintTrack(g);
            return;
        }
        Color trackColor = !slider.isEnabled() ? MetalLookAndFeel.getControlShadow() :
                           slider.getForeground();

	boolean leftToRight = MetalUtils.isLeftToRight(slider);

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

        int trackLeft = 0;
        int trackTop = 0;
        int trackRight = 0;
        int trackBottom = 0;

        // Draw the track
	if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            trackBottom = (trackRect.height - 1) - getThumbOverhang();
            trackTop = trackBottom - (getTrackWidth() - 1);
            trackRight = trackRect.width - 1;
	}
	else {
	    if (leftToRight) {
	        trackLeft = (trackRect.width - getThumbOverhang()) - 
		                                         getTrackWidth();
		trackRight = (trackRect.width - getThumbOverhang()) - 1;
	    }
	    else {
	        trackLeft = getThumbOverhang();
		trackRight = getThumbOverhang() + getTrackWidth() - 1;
	    }
            trackBottom = trackRect.height - 1;
	}

	if ( slider.isEnabled() ) {
	    g.setColor( MetalLookAndFeel.getControlDarkShadow() );
	    g.drawRect( trackLeft, trackTop,
			(trackRight - trackLeft) - 1, (trackBottom - trackTop) - 1 );
	    
	    g.setColor( MetalLookAndFeel.getControlHighlight() );
	    g.drawLine( trackLeft + 1, trackBottom, trackRight, trackBottom );
	    g.drawLine( trackRight, trackTop + 1, trackRight, trackBottom );

	    g.setColor( MetalLookAndFeel.getControlShadow() );
	    g.drawLine( trackLeft + 1, trackTop + 1, trackRight - 2, trackTop + 1 );
	    g.drawLine( trackLeft + 1, trackTop + 1, trackLeft + 1, trackBottom - 2 );
	}
	else {
	    g.setColor( MetalLookAndFeel.getControlShadow() );
	    g.drawRect( trackLeft, trackTop,
			(trackRight - trackLeft) - 1, (trackBottom - trackTop) - 1 );
	}

        // Draw the fill
	if ( filledSlider ) {
	    int middleOfThumb = 0;
	    int fillTop = 0;
	    int fillLeft = 0;
	    int fillBottom = 0;
	    int fillRight = 0;

	    if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
	        middleOfThumb = thumbRect.x + (thumbRect.width / 2);
		middleOfThumb -= trackRect.x; // To compensate for the g.translate()
		fillTop = !slider.isEnabled() ? trackTop : trackTop + 1;
		fillBottom = !slider.isEnabled() ? trackBottom - 1 : trackBottom - 2;
		
		if ( !drawInverted() ) {