RoundedBorder.java

/*
 *  RoundedBorder.java
 *  Eisenkraut
 *
 *  Copyright (c) 2004-2016 Hanns Holger Rutz. All rights reserved.
 *
 *  This software is published under the GNU General Public License v3+
 *
 *
 *	For further information, please contact Hanns Holger Rutz at
 *	contact@sciss.de
 */

package de.sciss.eisenkraut.gui;

import javax.swing.border.AbstractBorder;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.Area;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RectangularShape;
import java.awt.geom.RoundRectangle2D;

/**
 *	A border looking like aqua's search-field border
 */
@SuppressWarnings("serial")
public class RoundedBorder extends AbstractBorder {

    private static final int radius     = 6; // 11;
    private static final int diameter   = 12; // 22; // radius << 1;

    private final Insets insets = new Insets(3, radius, 1, radius); // top left bottom right

    private static final Color colrDark     = new Color(0x00, 0x00, 0x00, 0x88);
    // private static final Color colrLight    = new Color(0xFF, 0xFF, 0xFF, 0x78);
    private static final Color colrLight    = new Color(0xA0, 0xA0, 0xA0, 0x18);
    private static final Color colrDark2    = new Color(0x00, 0x00, 0x00, 0x18);
    private static final Color colrClearD   = new Color(0x00, 0x00, 0x00, 0x00);
    private static final Color colrClearL   = new Color(0xA0, 0xA0, 0xA0, 0x00);
    private static final Stroke strkOutline = new BasicStroke(1.0f);
    private static final Stroke strkInline  = new BasicStroke(2.0f);

    private Color	colrBg		= Color.white;
    private Paint	pntInline, pntOutlineT, pntOutlineB;

    private Shape	shpBg, shpInline, shpOutline;

    private int		recentWidth		= -1;
    private int		recentHeight	= -1;

    public RoundedBorder() {
        super();
    }

    public RoundedBorder(Color c) {
        this();
        setColor(c);
    }

    public void setColor(Color c) {
        colrBg = c;
    }

    public Insets getBorderInsets(Component c) {
        return new Insets(insets.top, insets.left, insets.bottom, insets.right);
    }

    public Insets getBorderInsets(Component c, Insets i) {
        i.top       = insets.top;
        i.left      = insets.left;
        i.bottom    = insets.bottom;
        i.right     = insets.right;
        return i;
    }

    public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
        final Graphics2D g2 = (Graphics2D) g;
        final AffineTransform atOrig = g2.getTransform();

        g2.translate(x, y);

        if( (width != recentWidth) || (height != recentHeight) ) {
            if( height != recentHeight ) {
                final int hh	= height >> 1;
                pntOutlineT     = new GradientPaint(0, 0 , colrDark  , 0, hh        , colrClearD);
                pntOutlineB     = new GradientPaint(0, hh, colrClearL, 0, height - 2, colrLight);
                pntInline       = new GradientPaint(0, 0 , colrDark2 , 0, hh        , colrClearD);
            }

            final RectangularShape	r	= new RoundRectangle2D.Float(0.5f, 0.5f, width - 1, height - 1, diameter, diameter);
            final RectangularShape	r2	= new RoundRectangle2D.Float(1.0f, 1.0f, width - 2, height - 2, diameter, diameter);
            final Area				a	= new Area(r);
            a.subtract( new Area( new Rectangle2D.Float( insets.left, insets.top,
                width - insets.left - insets.right, height - insets.top - insets.bottom )));

            shpOutline		= strkOutline.createStrokedShape(r2);
            shpInline		= strkInline .createStrokedShape(r2);
            shpBg			= a;

            recentWidth		= width;
            recentHeight	= height;
        }

        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING  , RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE );
        g2.setPaint(colrBg);
        g2.fill(shpBg);
        g2.setPaint(pntOutlineT);
        g2.fill(shpOutline);
        g2.setPaint(pntOutlineB);
        g2.fill(shpOutline);
        g2.translate(0, 1);
        g2.setPaint(pntInline);
        g2.fill(shpInline);

        g2.setTransform(atOrig);
    }
}