malachitebuttonui.java

Manning - Java Swing 2nd Edition (2003) swing2e源代码

/** 
 *  Copyright 1999-2002 Matthew Robinson and Pavel Vorobiev. 
 *  All Rights Reserved. 
 * 
 *  =================================================== 
 *  This program contains code from the book "Swing" 
 *  2nd Edition by Matthew Robinson and Pavel Vorobiev 
 *  http://www.spindoczine.com/sbe 
 *  =================================================== 
 * 
 *  The above paragraph must be included in full, unmodified 
 *  and completely intact in the beginning of any source code 
 *  file that references, copies or uses (in any way, shape 
 *  or form) code contained in this file. 
 */ 

package malachite;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;

public class MalachiteButtonUI
	extends    BasicButtonUI
	implements java.io.Serializable, MouseListener, KeyListener
{

	private final static MalachiteButtonUI m_buttonUI =
		new MalachiteButtonUI();

	protected Border m_borderRaised = null;
	protected Border m_borderLowered = null;
	protected Color  m_backgroundNormal = null;
	protected Color  m_backgroundPressed = null;
	protected Color  m_foregroundNormal = null;
	protected Color  m_foregroundActive = null;
	protected Color  m_focusBorder = null;

	public MalachiteButtonUI() {}

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

	public void installUI(JComponent c)
	{
		super.installUI(c);

		m_borderRaised = UIManager.getBorder(
			"Button.border");
		m_borderLowered = UIManager.getBorder(
			"Button.borderPressed");

		m_backgroundNormal = UIManager.getColor(
			"Button.background");
		m_backgroundPressed = UIManager.getColor(
			"Button.pressedBackground");

		m_foregroundNormal = UIManager.getColor(
			"Button.foreground");
		m_foregroundActive = UIManager.getColor(
			"Button.activeForeground");

		m_focusBorder = UIManager.getColor(
			"Button.focusBorder");

		c.addMouseListener(this);
		c.addKeyListener(this);
	}

	public void uninstallUI(JComponent c)
	{
		super.uninstallUI(c);
		c.removeMouseListener(this);
		c.removeKeyListener(this);
	}

	public void paint(Graphics g, JComponent c)
	{
		AbstractButton b = (AbstractButton) c;
		Dimension d = b.getSize();

		g.setFont(c.getFont());
		FontMetrics fm = g.getFontMetrics();

		g.setColor(b.getForeground());
		String caption = b.getText();
		int x = (d.width - fm.stringWidth(caption))/2;
		int y = (d.height + fm.getAscent())/2;
		g.drawString(caption, x, y);

		if (b.isFocusPainted() && b.hasFocus())
		{
			g.setColor(m_focusBorder);
			Insets bi = b.getBorder().getBorderInsets(b);
			g.drawRect(bi.left, bi.top, d.width-bi.left-bi.right-1,
				d.height-bi.top-bi.bottom-1);
		}
	}

	public Dimension getPreferredSize(JComponent c)
	{
		Dimension d = super.getPreferredSize(c);
		if (m_borderRaised != null)
		{
			Insets ins = m_borderRaised.getBorderInsets(c);
			d.setSize(d.width+ins.left+ins.right,
				d.height+ins.top+ins.bottom);
		}
		return d;
	}

	public void mouseClicked(MouseEvent e) {}

	public void mousePressed(MouseEvent e)
	{
		JComponent c = (JComponent)e.getComponent();
		c.setBorder(m_borderLowered);
		c.setBackground(m_backgroundPressed);
	}

	public void mouseReleased(MouseEvent e)
	{
		JComponent c = (JComponent)e.getComponent();
		c.setBorder(m_borderRaised);
		c.setBackground(m_backgroundNormal);
	}

	public void mouseEntered(MouseEvent e)
	{
		JComponent c = (JComponent)e.getComponent();
		c.setForeground(m_foregroundActive);
		c.repaint();
	}

	public void mouseExited(MouseEvent e)
	{
		JComponent c = (JComponent)e.getComponent();
		c.setForeground(m_foregroundNormal);
		c.repaint();
	}

	public void keyTyped(KeyEvent e) {}

	public void keyPressed(KeyEvent e)
	{
		int code = e.getKeyCode();
		if (code == KeyEvent.VK_ENTER || code == KeyEvent.VK_SPACE)
		{
			JComponent c = (JComponent)e.getComponent();
			c.setBorder(m_borderLowered);
			c.setBackground(m_backgroundPressed);
		}
	}

	public void keyReleased(KeyEvent e)
	{
		int code = e.getKeyCode();
		if (code == KeyEvent.VK_ENTER || code == KeyEvent.VK_SPACE)
		{
			JComponent c = (JComponent)e.getComponent();
			c.setBorder(m_borderRaised);
			c.setBackground(m_backgroundNormal);
		}
	}

}