Java7的一个新类——JLayer:装饰的Swing组件
2012-03-13 21:01 java线程例子 阅读(670) 评论(0) 编辑 收藏 举报Java7中的一个新的类,JLayer,也已被添加到提高的Java Swing的能力。 JLayer主要用于装饰的Swing组件。你可以用它改变如何绘制组件,以及它们如何响应事件。下面是这个类的一个简单的例子:
先看运行结果:
1、鼠标进入登陆框时:聚光灯效果(Spotlight)
2、点击登录按钮:
import java.awt.AWTEvent; import java.awt.AlphaComposite; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Composite; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Point; import java.awt.RadialGradientPaint; import java.awt.RenderingHints; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusAdapter; import java.awt.event.FocusEvent; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.MouseEvent; import java.beans.PropertyChangeEvent; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JLayer; import javax.swing.JPanel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.SwingUtilities; import javax.swing.Timer; import javax.swing.UIManager; import javax.swing.plaf.LayerUI; /** * @author http://blog.csdn.net/Cannel_2020 * */ public class TestJLayer { private static JFrame loginFrame; private LoginLayerUI layerUI;//LayerUI的一个子类 public static void main(String[] args) { try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"); } catch (Exception e) { e.printStackTrace(); } javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { new TestJLayer().createUI(); } }); } public void createUI() { loginFrame = new JFrame("From Cannel_2020's blog(CSDN)"); loginFrame.setSize(340, 260); loginFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); loginFrame.setLocationRelativeTo(null); JPanel panel = createPanel(); layerUI = new LoginLayerUI(); /* * JLayer的构造函数:JLayer(V view, LayerUI<V> ui), * 第一个参数view为Component的一个子类,就是要要装饰的Swing组件 * 第二个参数为LayerUI<V>的一个实例,指定 */ JLayer<JPanel> jlayer = new JLayer<JPanel>(panel, layerUI); //注意这个add的是JLayer<JPanel>的一个实例 loginFrame.add(jlayer); loginFrame.setVisible(true); } private JPanel createPanel() { final Image background = new ImageIcon("image/background.jpg").getImage();//背景图片 JPanel panel = new JPanel() { private static final long serialVersionUID = 6246862165441423926L; public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; g2d.drawImage(background, 0, 0, loginFrame.getWidth(), loginFrame.getHeight(), this); } }; panel.setLayout(null); Font font = new Font("微软雅黑",Font.PLAIN,14); JLabel accountLabel = new JLabel("账号:"); accountLabel.setFont(font); accountLabel.setBounds(40, 60, 40, 15); JLabel pswLabel = new JLabel("密码:"); pswLabel.setFont(font); pswLabel.setBounds(40, 98, 40, 15); final JTextField userName = new JTextField(); userName.setFont(font); userName.setBounds(88, 53, 155, 33); userName.addFocusListener(new FocusAdapter(){ public void focusGained(FocusEvent e) { userName.selectAll(); } }); JPasswordField password = new JPasswordField(); password.setBounds(88, 90, 155, 33); JLabel registerLabel = new JLabel("注册"); registerLabel.setFont(font); registerLabel.setBounds(260, 60, 28, 19); JLabel findBackLabel = new JLabel("找回"); findBackLabel.setFont(font); findBackLabel.setBounds(260, 98, 28, 19); JCheckBox rmbCBox = new JCheckBox("记住密码"); rmbCBox.setSelected(true); rmbCBox.setBounds(90, 140, 77, 14); rmbCBox.addItemListener(new ItemListener(){ public void itemStateChanged(ItemEvent e) { if(e.getStateChange() == ItemEvent.DESELECTED){ System.out.println("rmbCBox(JCheckBox)被选中!"); } } }); JCheckBox autoCBox = new JCheckBox("自动登录"); autoCBox.setBounds(175, 140, 77, 14); JButton setButton = new JButton("设置"); setButton.setBounds(50, 170, 75, 27); JButton loginButton = new JButton("登录"); loginButton.setFont(font); loginButton.setBounds(90, 170, 75, 27); //5秒钟后停止 final Timer stopper = new Timer(5000, new ActionListener() { public void actionPerformed(ActionEvent ae) { layerUI.stop(); } }); stopper.setRepeats(false);//设置计时器只在第一次时触发然后停止 loginButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { layerUI.start(); //若stopper不是在运行,则启动stopper。 if (!stopper.isRunning()) { stopper.start(); } } }); JButton exitButton = new JButton("退出"); exitButton.setFont(font); exitButton.setBounds(170, 170, 75, 27); exitButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); panel.add(userName); panel.add(password); panel.add(accountLabel); panel.add(pswLabel); panel.add(registerLabel); panel.add(findBackLabel); panel.add(rmbCBox); panel.add(autoCBox); panel.add(loginButton); panel.add(exitButton); return panel; } } class LoginLayerUI extends LayerUI<JPanel> implements ActionListener { private static final long serialVersionUID = 1L; private boolean mIsRunning = false;// 点击按钮之后所触发的线程是否在运行 private boolean mIsFadingOut = false;//控制线程的停止,和处理 private Timer mTimer;// 在指定时间间隔触发一个或多个 ActionEvent。 private int mAngle = 0;//用于旋转时计算角度 private int mFadeCount = 0;//结合mFadeLimit用于设置针形旋转图案整体的渐变的效果 private int mFadeLimit = 30; private boolean mActive;// 是否进入窗口内 private int mX, mY;// 记录鼠标的坐标 /* * 渲染效果的过程中会不断调用paint */ public void paint(Graphics g, JComponent c) { int w = c.getWidth();//获取组件c的宽度 int h = c.getHeight(); super.paint(g, c);//调用父类的paint方法,绘画组件c Graphics2D g2 = (Graphics2D) g.create(); // 设置聚光灯(Spotlight)效果 if (mActive) { // 创建径向渐变,中间透明。 java.awt.geom.Point2D center = new java.awt.geom.Point2D.Float(mX, mY); float radius = 72; float[] dist = { 0.0f, 1.0f }; Color[] colors = { new Color(0.0f, 0.0f, 0.0f, 0.0f), Color.black }; //RadialGradientPaint 类提供使用圆形辐射颜色渐变模式填充某一形状的方式 RadialGradientPaint p = new RadialGradientPaint(center, radius, dist, colors); //setPaint:为 Graphics2D 上下文设置 Paint 属性 g2.setPaint(p); /*为 Graphics2D 上下文设置 Composite。 *Composite 用于所有绘制方法中,如 drawImage、drawString、draw 和 fill *这里使用AlphaComposite 类实现一些基本的 alpha 合成规则 *将源色与目标色组合,在图形和图像中实现混合和透明效果 */ g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .6f)); //填充是绘画 g2.fillRect(0, 0, c.getWidth(), c.getHeight()); } if (!mIsRunning) { return; } float fade = (float) mFadeCount / (float) mFadeLimit; //fade的不同形成:12根针整体刚才出现的渐变效果,和登录成功后的针消失过程的渐变效果 g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .5f * fade)); g2.fillRect(0, 0, w, h); int s = Math.min(w, h) / 5; int cx = w / 2; int cy = h / 2; /* 为呈现算法设置单个首选项的值。 * RenderingHints.KEY_ANTIALIASING:抗锯齿提示键。 * RenderingHints.VALUE_ANTIALIAS_ON:抗锯齿提示值——使用抗锯齿模式完成呈现 */ g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); /* * setStroke:设置呈现过程中要画的图形 * BasicStroke 类定义针对图形图元轮廓呈现属性的一个基本集合 */ g2.setStroke(new BasicStroke(s / 4, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND)); //设置绘画颜色 g2.setPaint(Color.white); /* rotate:旋转转换连接 * 第一个参数 Math.PI * mAngle / 180:旋转的角度,以弧度为单位 * 第二个参数 cx:x - 旋转原点的 x 坐标 * 第二个参数 cy:y - 旋转原点的 y 坐标 */ g2.rotate(Math.PI * mAngle / 180, cx, cy); //12跟针,各个针的颜色是不同的,针与针之间形成渐变的效果 for (int i = 0; i < 12; i++) { float scale = (11.0f - (float) i) / 11.0f; g2.drawLine(cx + s, cy, cx + s * 2, cy); g2.rotate(-Math.PI / 6, cx, cy); //通过设置AlphaComposite.getInstance()第二个参数的不同来实现12“针”颜色的不同 g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, scale * fade)); } //释放此图形的上下文以及它使用的所有系统资源。 g2.dispose(); } public void installUI(JComponent c) { super.installUI(c); JLayer jlayer = (JLayer) c; // 启动鼠标事件和鼠标移动事件 jlayer.setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK); } public void uninstallUI(JComponent c) { JLayer jlayer = (JLayer) c; jlayer.setLayerEventMask(0); super.uninstallUI(c); } // JLayer对象专用的鼠标事件,在installUI中启动事件,在uninstallUI中禁用事件 protected void processMouseEvent(MouseEvent e, JLayer l) { if (e.getID() == MouseEvent.MOUSE_ENTERED) mActive = true; if (e.getID() == MouseEvent.MOUSE_EXITED) mActive = false; l.repaint(); } // JLayer对象专用的鼠标移动事件,在installUI中启动事件,在uninstallUI中禁用事件 // 这里把鼠标坐标记录在mX和mY中 protected void processMouseMotionEvent(MouseEvent e, JLayer l) { // 确定鼠标移动事件相对于层的坐标位置。 Point p = SwingUtilities .convertPoint(e.getComponent(), e.getPoint(), l); mX = p.x; mY = p.y; l.repaint(); } public void actionPerformed(ActionEvent e) { if (mIsRunning) { //firePropertyChange():通知的内部状态的更新 firePropertyChange("tick", 0, 1); mAngle += 3; if (mAngle >= 360) { mAngle = 0; } if (mIsFadingOut) { if (--mFadeCount == 0) { mIsRunning = false; mTimer.stop(); } //防止AlphaComposite.getInstance()的第二个参数的值超出范围 } else if (mFadeCount < mFadeLimit) { mFadeCount++; } } } public void start() { if (mIsRunning) { return; } mIsRunning = true; mIsFadingOut = false; mFadeCount = 0; int fps = 24; int tick = 1000 / fps; //每tick毫秒调用一次本类中的actionPerformed方法 mTimer = new Timer(tick, this); mTimer.start(); } public void stop() { mIsFadingOut = true; } //不断repaint()窗口 public void applyPropertyChange(PropertyChangeEvent pce, JLayer l) { if ("tick".equals(pce.getPropertyName())) { l.repaint(); } } }