JDK14/Java14源码在线阅读

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 * 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 com.sun.java.swing.plaf.motif;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Rectangle;

import javax.swing.JComponent;
import javax.swing.JSlider;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicSliderUI;

import static sun.swing.SwingUtilities2.drawHLine;
import static sun.swing.SwingUtilities2.drawVLine;

/**
 * Motif Slider
 * <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.
 *
 * @author Jeff Dinkins
 */
public class MotifSliderUI extends BasicSliderUI {

    static final Dimension PREFERRED_HORIZONTAL_SIZE = new Dimension(164, 15);
    static final Dimension PREFERRED_VERTICAL_SIZE = new Dimension(15, 164);

    static final Dimension MINIMUM_HORIZONTAL_SIZE = new Dimension(43, 15);
    static final Dimension MINIMUM_VERTICAL_SIZE = new Dimension(15, 43);

    /**
     * MotifSliderUI Constructor
     */
    public MotifSliderUI(JSlider b)   {
        super(b);
    }

    /**
     * create a MotifSliderUI object
     */
    public static ComponentUI createUI(JComponent b)    {
        return new MotifSliderUI((JSlider)b);
    }

    public Dimension getPreferredHorizontalSize() {
        return PREFERRED_HORIZONTAL_SIZE;
    }

    public Dimension getPreferredVerticalSize() {
        return PREFERRED_VERTICAL_SIZE;
    }

    public Dimension getMinimumHorizontalSize() {
        return MINIMUM_HORIZONTAL_SIZE;
    }

    public Dimension getMinimumVerticalSize() {
        return MINIMUM_VERTICAL_SIZE;
    }

    protected Dimension getThumbSize() {
        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            return new Dimension( 30, 15 );
        }
        else {
            return new Dimension( 15, 30 );
        }
    }

    public void paintFocus(Graphics g)  {
    }

    public void paintTrack(Graphics g)  {
    }

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

        int x = knobBounds.x;
        int y = knobBounds.y;
        int w = knobBounds.width;
        int h = knobBounds.height;

        if ( slider.isEnabled() ) {
            g.setColor(slider.getForeground());
        }
        else {
            // PENDING(jeff) - the thumb should be dithered when disabled
            g.setColor(slider.getForeground().darker());
        }

        if ( slider.getOrientation() == JSlider.HORIZONTAL ) {
            g.translate(x, knobBounds.y-1);

            // fill
            g.fillRect(0, 1, w, h - 1);

            // highlight
            g.setColor(getHighlightColor());
            drawHLine(g, 0, w - 1, 1);      // top
            drawVLine(g, 0, 1, h);          // left
            drawVLine(g, w / 2, 2, h - 1);  // center

            // shadow
            g.setColor(getShadowColor());
            drawHLine(g, 0, w - 1, h);      // bottom
            drawVLine(g, w - 1, 1, h);      // right
            drawVLine(g, w / 2 - 1, 2, h);  // center

            g.translate(-x, -(knobBounds.y-1));
        }
        else {
            g.translate(knobBounds.x-1, 0);

            // fill
            g.fillRect(1, y, w - 1, h);

            // highlight

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