Button.java example

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open-mika-master
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package java.awt;

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

public class Button extends Component {
  
  String label;
  String command;
 
  public Button() {
    this.label = "";
    this.command = null;
  }

  public Button(String label) {
    this.label = (label != null) ? label : "";
    this.command = null;
  }

  /**
   * Assign the new listener or return an AWTEventMulticaster 
   * listener that contains it
   */
  public synchronized void addActionListener(java.awt.event.ActionListener newlistener) {
    actionListener = AWTEventMulticaster.add(actionListener, newlistener);
  }

  /**
   * Remove the old listener or return an AWTEventMulticaster
   * listener where it is removed
   */
  public synchronized void removeActionListener(java.awt.event.ActionListener oldlistener) {
    actionListener = AWTEventMulticaster.remove(actionListener, oldlistener);
  }

  /**
   * We overwrite processEvent so that a super or subclass requesting
   * to throw an ActionEvent throws it through the multicaster to all
   * subscribed listeners
   */
  protected void processEvent(AWTEvent event) {
    if (event instanceof ActionEvent) {
      processActionEvent(new ActionEvent(event.getSource(), event.getID(), (command == null) ? label : command));
    }
    else {
      super.processEvent(event);
    }
  }

  protected void processActionEvent(ActionEvent event) {
    if (actionListener != null) {
      actionListener.actionPerformed(event);
    }
  }

  public void addNotify() {
    if(peer == null) {
      peer = getToolkit().createButton(this);
    }

    if (notified == false) {
      super.addNotify();
    }
  }

  public String getActionCommand() {
    return (command == null) ? label : command;
  }

  public void setActionCommand(String command) {
    this.command = command;
  }

  public synchronized void setLabel(String label) {
    this.label = (label != null) ? label : "";

    valid = false;
    ((ButtonPeer)peer).setLabel(label);
  }

  public String getLabel() {
    return label;
  }

  public String toString() {
    return getClass().getName() + " - label: " + label + ", bounds: x = " + x + ", y = " + y + ", w = " + width + ", h = " + height;
  }

  protected String paramString() {
    return getClass().getName() + " label: "+ label + " ActionCommand: " + command + ", bounds: (" + x + ", " + y + ", " + width + ", " + height + ")";
  }

}