curvedborder.java

java swing 开发代码

// CurvedBorder.java
// A custom border that draws round rectangle borders.
//
package	jswing.ch13;

import java.awt.*;
import javax.swing.border.*;

public class CurvedBorder extends AbstractBorder
{
    private Color wallColor = Color.gray;
    private int sinkLevel = 10;

    public CurvedBorder() { }
    public CurvedBorder(int sinkLevel) { this.sinkLevel = sinkLevel; }
    public CurvedBorder(Color wall) { this.wallColor = wall; }
    public CurvedBorder(int sinkLevel, Color wall)    {
        this.sinkLevel = sinkLevel;
        this.wallColor = wall;
    }

    public void paintBorder(Component c, Graphics g, int x, int y,
                            int w, int h)
    {
        g.setColor(getWallColor());

        //  Paint a tall wall around the component
        for (int i = 0; i < sinkLevel; i++) {
           g.drawRoundRect(x+i, y+i, w-i-1, h-i-1, sinkLevel-i, sinkLevel);
           g.drawRoundRect(x+i, y+i, w-i-1, h-i-1, sinkLevel, sinkLevel-i);
           g.drawRoundRect(x+i, y, w-i-1, h-1, sinkLevel-i, sinkLevel);
           g.drawRoundRect(x, y+i, w-1, h-i-1, sinkLevel, sinkLevel-i);
        }
    }

    public Insets getBorderInsets(Component c) {
        return new Insets(sinkLevel, sinkLevel, sinkLevel, sinkLevel);
    }
    public Insets getBorderInsets(Component c, Insets i) {
        i.left = i.right = i.bottom = i.top = sinkLevel;
        return i;
    }
    public boolean isBorderOpaque() { return true; }
    public int getSinkLevel() { return sinkLevel; }
    public Color getWallColor() { return wallColor; }
}