Философия Java


Повторное обращение к JavaBeans - часть 2


public class BangBean2 extends JPanel implements Serializable { private int xm, ym; private int cSize = 20; // Circle size

private String text = "Bang!"; private int fontSize = 48; private Color tColor = Color.red; private ArrayList actionListeners = new ArrayList(); public BangBean2() { addMouseListener(new ML()); addMouseMotionListener(new MM()); } public synchronized int getCircleSize() { return cSize; } public synchronized void setCircleSize(int newSize) { cSize = newSize; } public synchronized String getBangText() { return text; } public synchronized void setBangText(String newText) { text = newText; } public synchronized int getFontSize() { return fontSize; } public synchronized void setFontSize(int newSize) { fontSize = newSize; } public synchronized Color getTextColor() { return tColor; } public synchronized void setTextColor(Color newColor) { tColor = newColor; } public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.black); g.drawOval(xm - cSize/2, ym - cSize/2, cSize, cSize); } // This is a multicast listener, which is

// more typically used than the unicast

// approach taken in BangBean.java:

public synchronized void addActionListener(ActionListener l) { actionListeners.add(l); } public synchronized void removeActionListener(ActionListener l) { actionListeners.remove(l); } // Notice this isn't synchronized:

public void notifyListeners() { ActionEvent a = new ActionEvent(BangBean2.this, ActionEvent.ACTION_PERFORMED, null); ArrayList lv = null; // Make a shallow copy of the List in case

// someone adds a listener while we're

// calling listeners:

synchronized(this) { lv = (ArrayList)actionListeners.clone(); } // Call all the listener methods:

for(int i = 0; i < lv.size(); i++) ((ActionListener)lv.get(i)) .actionPerformed(a); } class ML extends MouseAdapter { public void mousePressed(MouseEvent e) { Graphics g = getGraphics(); g.setColor(tColor); g.setFont( new Font( "TimesRoman", Font.BOLD, fontSize)); int width = g.getFontMetrics().stringWidth(text); g.drawString(text, (getSize().width - width) /2, getSize().height/2); g.dispose(); notifyListeners(); } } class MM extends MouseMotionAdapter { public void mouseMoved(MouseEvent e) { xm = e.getX(); ym = e.getY(); repaint(); } } public static void main(String[] args) { BangBean2 bb = new BangBean2(); bb.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e){ System.out.println("ActionEvent" + e); } }); bb.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e){ System.out.println("BangBean2 action"); } }); bb.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e){ System.out.println("More action"); } }); Console.run(bb, 300, 300); } } ///:~




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