精美Swing 折叠菜单

/* * CaptionButtonUI.java * * Created on June 9, 2007, 8:56 AM * * To change this template, choose Tools | Template Manager * and open the template in the editor. */ package dyno.swing.beans; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Cursor; import java.awt.Font; import java.awt.FontMetrics; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Stroke; import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import java.awt.event.ItemEvent; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JComponent; import javax.swing.plaf.ComponentUI; /** * 这个类时CaptionButton组建的UI类。 * 该UI类是个有状态UI类。 * * @author William Chen * @mail rehte@hotmail.com */ public class CaptionButtonUI extends ComponentUI implements MouseMotionListener, MouseListener, FocusListener{ //缺省前景色和缺省字体 private static final Color DEFAULT_FOREGROUND=new Color(33,93,198); private static final Font DEFAULT_FONT=new Font("Dialog", Font.BOLD, 12); //定义一些缺省属性的值，比如颜色、字体、尺寸、间隙、缺省图标、虚线框的stroke等等。 private static final Color LIGHTER=new Color(255,255,255); private static final Color DARKER=new Color(198,211,247); private static final int TEXT_LEADING_GAP=14; private static final int IMAGE_TAILING_GAP=12; private static final Color HOVERED_COLOR=new Color(66,142,255); private static Stroke DASHED_STROKE=new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[] {1}, 0); private static Icon iconExpanded; private static Icon iconFoldered; private static Icon hoveredExpanded; private static Icon hoveredFoldered; static{ //初始化 iconExpanded=new ImageIcon(CaptionButtonUI.class.getResource("resources/expanded.png")); iconFoldered=new ImageIcon(CaptionButtonUI.class.getResource("resources/foldered.png")); hoveredExpanded=new ImageIcon(CaptionButtonUI.class.getResource("resources/hovered_expanded.png")); hoveredFoldered=new ImageIcon(CaptionButtonUI.class.getResource("resources/hovered_foldered.png")); } //是否画虚线框 private boolean armed; //文字左边间隙 private int textLeadingGap=TEXT_LEADING_GAP; //图像邮编间隙 private int imageTailingGap=IMAGE_TAILING_GAP; //渐变色起始色 private Color lightColor=LIGHTER; //渐变色结束色 private Color darkColor=DARKER; //当前鼠标是否浮动在上面 private boolean hovered; //鼠标浮动在标题上方时标题的颜色 private Color hoveredColor=HOVERED_COLOR; //该UI实例对应的CaptionButton protected CaptionButton button; public static ComponentUI createUI(JComponent c) { return new CaptionButtonUI(); } /** Creates a new instance of CaptionButtonUI */ public CaptionButtonUI() { } //安装CaptionButton的LAF public void installUI(JComponent c) { //设置缺省属性 button=(CaptionButton)c; button.setForeground(DEFAULT_FOREGROUND); button.setFont(DEFAULT_FONT); button.setFocusable(true); //添加事件处理器 button.addMouseListener(this); button.addMouseMotionListener(this); button.addFocusListener(this); } //卸载UI public void uninstallUI(JComponent c) { //卸载事件处理器 button.removeMouseListener(this); button.removeMouseMotionListener(this); button.removeFocusListener(this); } //画CaptionButton的背景。继承CaptionButtonUI的子类可以覆盖该方法自定义背景 protected void paintBackground(Graphics g){ int w=button.getWidth(); int h=button.getHeight(); Graphics2D g2d=(Graphics2D)g; GradientPaint gp=new GradientPaint(1,1,lightColor, w-2,1, darkColor); g2d.setPaint(gp); g2d.fillRect(1,1,w-2,h-1); gp=new GradientPaint(2,0,lightColor, w-4,0, darkColor); g2d.setPaint(gp); g2d.fillRect(2,0,w-4,1); g2d.setColor(lightColor); g2d.drawLine(0,2,0,h-1); g2d.setColor(darkColor); g2d.drawLine(w-1,2,w-1,h-1); } public void paint(Graphics g, JComponent c) { paintBackground(g); paintCaptionText(g); paintIcon(g); if(armed) paintArmed(g); } //画虚线框，继承CaptionButtonUI的子类可以覆盖该方法自定义焦点获得外观 protected void paintArmed(Graphics g) { Graphics2D g2d=(Graphics2D)g; g2d.setColor(Color.black); g2d.setStroke(DASHED_STROKE); g2d.drawRoundRect(1,1,button.getWidth()-3,button.getHeight()-3,2,2); } //画标题栏展开、关闭图标，继承CaptionButtonUI的子类可以覆盖该方法自定义展开、关闭图标 protected void paintIcon(Graphics g) { Icon icon=null; if(hovered) icon=button.isExpanded()?hoveredExpanded:hoveredFoldered; else icon=button.isExpanded()?iconExpanded:iconFoldered; int x=button.getWidth()-imageTailingGap-icon.getIconWidth(); int y=(button.getHeight()-icon.getIconHeight())/2; icon.paintIcon(button, g, x, y); } //画标题栏文字，继承CaptionButtonUI的子类可以覆盖该方法自定义文字的外观 protected void paintCaptionText(Graphics g) { FontMetrics fm=g.getFontMetrics(); if(button.getText()!=null){ Color foreground=button.getForeground(); Color color=hovered?hoveredColor:foreground; g.setColor(color); int y=(button.getHeight()-fm.getHeight())/2+fm.getAscent(); g.drawString(button.getText(), textLeadingGap, y); } } //处理按下鼠标事件 public void mousePressed(MouseEvent e) { //改换外观 setArmed(true); //折叠或者展开 button.setExpanded(!button.isExpanded()); //触发选择事件 ItemEvent evt=new ItemEvent(button, button.isExpanded()?0:1, button.getText(), button.isExpanded()?ItemEvent.SELECTED:ItemEvent.DESELECTED); button.fireItemStateChanged(evt); //获得焦点 button.requestFocus(); } //鼠标进入事件、浮动事件 public void mouseEntered(MouseEvent e) { //浮动 setHovered(true); //改鼠标外观 button.setCursor( Cursor.getPredefinedCursor( Cursor.HAND_CURSOR)); } //鼠标退出事件 public void mouseExited(MouseEvent e) { //浮动消失 setHovered(false); } void setHovered(boolean b){ hovered=b; button.repaint(); } //焦点消失事件 public void focusLost(FocusEvent e) { setArmed(false); } void setArmed(boolean b){ armed=b; button.repaint(); } public void mouseDragged(MouseEvent e) { } public void mouseMoved(MouseEvent e) { } public void mouseClicked(MouseEvent e) { } public void mouseReleased(MouseEvent e) { } public void focusGained(FocusEvent e) { } }