11.10 Map

src/bangbean/BangBean.java

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+//: bangbean/BangBean.java
+// A graphical Bean.
+package bangbean;
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+import java.io.*;
+import java.util.*;
+
+public class
+BangBean 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 ActionListener actionListener;
+  public BangBean() {
+    addMouseListener(new ML());
+    addMouseMotionListener(new MML());
+  }
+  public int getCircleSize() { return cSize; }
+  public void setCircleSize(int newSize) {
+    cSize = newSize;
+  }
+  public String getBangText() { return text; }
+  public void setBangText(String newText) {
+    text = newText;
+  }
+  public int getFontSize() { return fontSize; }
+  public void setFontSize(int newSize) {
+    fontSize = newSize;
+  }
+  public Color getTextColor() { return tColor; }
+  public 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 unicast listener, which is
+  // the simplest form of listener management:
+  public void addActionListener(ActionListener l)
+  throws TooManyListenersException {
+    if(actionListener != null) {
+        throw new TooManyListenersException();
+    }
+    actionListener = l;
+  }
+  public void removeActionListener(ActionListener l) {
+    actionListener = null;
+  }
+  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();
+      // Call the listener's method:
+      if(actionListener != null) {
+          actionListener.actionPerformed(
+            new ActionEvent(BangBean.this,
+              ActionEvent.ACTION_PERFORMED, null));
+      }
+    }
+  }
+  class MML extends MouseMotionAdapter {
+    public void mouseMoved(MouseEvent e) {
+      xm = e.getX();
+      ym = e.getY();
+      repaint();
+    }
+  }
+  public Dimension getPreferredSize() {
+    return new Dimension(200, 200);
+  }
+} ///:~