simparamdouble.java

一个小型网络仿真器的实现

/*
   JaNetSim  ---  Java Network Simulator
   -------------------------------------

   This software was developed at the Network Research Lab, Faculty of
   Computer Science and Information Technology (FCSIT), University of Malaya.
   This software may be used and distributed freely. FCSIT assumes no responsibility
   whatsoever for its use by other parties, and makes no guarantees, expressed or
   implied, about its quality, reliability, or any other characteristic.

   We would appreciate acknowledgement if the software is used.

   FCSIT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION AND
   DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING
   FROM THE USE OF THIS SOFTWARE.
*/

package janetsim.component;

import janetsim.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class SimParamDouble extends SimParameter implements ActionListener,java.io.Serializable {
  private double value;
  private boolean isEditable;
  private transient JComponent jcomp=null;
  
  public SimParamDouble(String aName,SimComponent comp,long creationTick,boolean isLoggable,
                          boolean editable,double val) {
    super(aName,comp,creationTick,isLoggable);
    value=val;
    isEditable=editable;
  }

////////////// possible overrides //////////////////////////

  public double getValue() {
    return value;
  }

  public void setValue(double val) {
    value=val;
    if(jcomp!=null) scheduleUpdate();
  }

  //helper for thread safe GUI update
  private void scheduleUpdate() {
    Runnable r=new Runnable() {
      public void run() {
        if(isEditable) ((JButton)jcomp).setText(String.valueOf(value));
        else  ((JLabel)jcomp).setText(String.valueOf(value));
      }
    };
    SwingUtilities.invokeLater(r);
  }

  //helper setValue() with auto-update given current tick and a minimum
  //interval between updates (interval must be >0 to have effect)
  public void setValue(double val,long tick,long interval) {
    setValue(val);
    if(interval>0 && (tick-getLastUpdateTick() >= interval)) update(tick);
  }

  public boolean globalSetValue(String val) {
    if(!isEditable) return false;
    try {
      double newval=Double.parseDouble(val.trim());
      setValue(newval);
      return true;
    } catch(NumberFormatException ex) {
      return false;
    }
  }

  protected void doMeter(long tick) {
    theMeter.add(tick,value);
  }

  public String getString() {
    return String.valueOf(value);
  }

  public JComponent getJComponent() {
    if(jcomp==null) {
      if(isEditable) {
        jcomp=new JButton(String.valueOf(value));
        ((JButton)jcomp).setHorizontalAlignment(JButton.LEFT);
        ((JButton)jcomp).addActionListener(this);
      }
      else {
        jcomp=new JLabel(String.valueOf(value));
        ((JLabel)jcomp).setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createLineBorder(Color.black),
                BorderFactory.createEmptyBorder(0,5,0,5)));
      }
    }
    return jcomp;
  }

  public void actionPerformed(ActionEvent e) {
    String newVal=JOptionPane.showInputDialog(theGUI.getMainFrame(),
      "New value:",getName(),JOptionPane.QUESTION_MESSAGE);
    if(newVal==null) return;

    if(!globalSetValue(newVal)) {
      JOptionPane.showMessageDialog(theGUI.getMainFrame(),"Not a valid value!","Error",
        JOptionPane.INFORMATION_MESSAGE);
    }
  }
}