dialogseparator.java

这是JFrame的一些例子(chapter4)。可以参考一下。想要做GUI的人不妨看一看

/**
	DialogSeparator
*/
package dl;

import java.awt.*;

import javax.swing.*;

public class DialogSeparator 
	extends JLabel
{
	public static final int OFFSET = 15;

	public DialogSeparator() {}

	public DialogSeparator(String text) 
	{
		super(text);
	}

	public Dimension getPreferredSize()
	{
		return new Dimension(getParent().getWidth(), 20);
	}

	public Dimension getMinimumSize()
	{
		return getPreferredSize();
	}

	public Dimension getMaximumSize()
	{
		return getPreferredSize();
	}

	public void paint(Graphics g)
	{
		g.setColor(getBackground());
		g.fillRect(0, 0, getWidth(), getHeight());

		Dimension d = getSize();
		int y = (d.height-3)/2;
		g.setColor(Color.white);
		g.drawLine(1, y, d.width-1, y);
		y++;
		g.drawLine(0, y, 1, y);
		g.setColor(Color.gray);
		g.drawLine(d.width-1, y, d.width, y);
		y++;
		g.drawLine(1, y, d.width-1, y);

		String text = getText();
		if (text.length()==0)
			return;

		g.setFont(getFont());
		FontMetrics fm = g.getFontMetrics();
		y = (d.height + fm.getAscent())/2;
		int l = fm.stringWidth(text);

		g.setColor(getBackground());
		g.fillRect(OFFSET-5, 0, OFFSET+l, d.height);

		g.setColor(getForeground());
		g.drawString(text, OFFSET, y);
	}
}