temperatureview.java

一个温度计的小程序

/*
 * TemperatureView - a view for C or F temps.
 * Copyright (c) 2001, Bruce E. Wampler
 */

import java.util.*;
import java.awt.*;
import javax.swing.*;

public class TemperatureView extends WmvcView
{
    private JPanel myPanel;
    private ThermometerModel myModel;           // local copy
    private char myScale;

    private static JLabel lblF = new JLabel("Fahrenheit: ");
    private static JLabel lblC = new JLabel("Celsius: ");
    private JLabel fldTemp;

    public JPanel getPanel() { return myPanel; }

    public TemperatureView(char scale)
    {
        myModel = (ThermometerModel)WmvcApp.getModel();
        myModel.addView(this);          // adds update for mvc

        myScale = scale;                // remember my scale

        myPanel = new JPanel();         // surrounding Panel
        myPanel.setPreferredSize( new Dimension(390, 40));

        if (scale == 'F' || scale == 'f')
        {
            myPanel.add(lblF);                  // F degrees
        }
        else
        {
            myPanel.add(lblC);                  // C degrees
        }
        fldTemp = new JLabel(" ");
        fldTemp.setForeground(Color.black);     // temp in black
        myPanel.add(fldTemp);
    }

    public void updateView()
    {
        int val = myModel.getTemp();
        if (myScale == 'C')
            val = (int) (((double)(val-32))/1.8); // not rounded
        fldTemp.setText(Integer.toString(val));
    }
}