samer@1: /*
samer@1:  * 1.1+Swing version.
samer@1:  */
samer@1: 
samer@1: import javax.swing.*;
samer@1: import javax.swing.event.*;
samer@1: import java.awt.*;
samer@1: import java.awt.event.*;
samer@1: import java.util.*;
samer@1: 
samer@1: public class Converter {
samer@1:     ConversionPanel metricPanel, usaPanel;
samer@1:     Unit[] metricDistances = new Unit[3];
samer@1:     Unit[] usaDistances = new Unit[4];
samer@1:     final static boolean COLORS = false;
samer@1:     final static boolean DEBUG = false;
samer@1:     final static String LOOKANDFEEL = null;
samer@1:     ConverterRangeModel dataModel = new ConverterRangeModel();
samer@1:     JPanel mainPane;
samer@1: 
samer@1:     /** 
samer@1:      * Create the ConversionPanels (one for metric, another for U.S.).
samer@1:      * I used "U.S." because although Imperial and U.S. distance
samer@1:      * measurements are the same, this program could be extended to
samer@1:      * include volume measurements, which aren't the same.
samer@1:      *
samer@1:      * Put the ConversionPanels into a frame, and bring up the frame.
samer@1:      */
samer@1:     public Converter() {
samer@1:         //Create Unit objects for metric distances, and then 
samer@1:         //instantiate a ConversionPanel with these Units.
samer@1:         metricDistances[0] = new Unit("Centimeters", 0.01);
samer@1:         metricDistances[1] = new Unit("Meters", 1.0);
samer@1:         metricDistances[2] = new Unit("Kilometers", 1000.0);
samer@1:         metricPanel = new ConversionPanel(this, "Metric System",
samer@1:                                           metricDistances,
samer@1:                                           dataModel);
samer@1: 
samer@1:         //Create Unit objects for U.S. distances, and then 
samer@1:         //instantiate a ConversionPanel with these Units.
samer@1:         usaDistances[0] = new Unit("Inches", 0.0254);
samer@1:         usaDistances[1] = new Unit("Feet", 0.305);
samer@1:         usaDistances[2] = new Unit("Yards", 0.914);
samer@1:         usaDistances[3] = new Unit("Miles", 1613.0);
samer@1:         usaPanel = new ConversionPanel(this, "U.S. System",
samer@1:                                        usaDistances,
samer@1:                                        new FollowerRangeModel(dataModel));
samer@1: 
samer@1:         //Create a JPanel, and add the ConversionPanels to it.
samer@1:         mainPane = new JPanel();
samer@1:         if (COLORS) {
samer@1:             mainPane.setBackground(Color.red);
samer@1:         }
samer@1:         mainPane.setLayout(new GridLayout(2,1,5,5));
samer@1:         mainPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
samer@1:         mainPane.add(metricPanel);
samer@1:         mainPane.add(usaPanel);
samer@1:         resetMaxValues(true);
samer@1:     }
samer@1: 
samer@1:     public void resetMaxValues(boolean resetCurrentValues) {
samer@1:         double metricMultiplier = metricPanel.getMultiplier();
samer@1:         double usaMultiplier = usaPanel.getMultiplier();
samer@1:         int maximum = ConversionPanel.MAX;
samer@1: 
samer@1:         if (metricMultiplier > usaMultiplier) {
samer@1:             maximum = (int)(ConversionPanel.MAX *
samer@1:                       (usaMultiplier/metricMultiplier));
samer@1:         }
samer@1: 
samer@1:         if (DEBUG) {
samer@1:             System.out.println("in Converter resetMaxValues");
samer@1:             System.out.println("  metricMultiplier = " 
samer@1:                                 + metricMultiplier
samer@1:                              + "; usaMultiplier = "
samer@1:                                 + usaMultiplier
samer@1:                              + "; maximum = " 
samer@1:                                 + maximum);
samer@1:         }
samer@1: 
samer@1:         dataModel.setMaximum(maximum);
samer@1: 
samer@1:         if (resetCurrentValues) {
samer@1:             dataModel.setDoubleValue(maximum);
samer@1:         }
samer@1:     }
samer@1: 
samer@1:     private static void initLookAndFeel() { 
samer@1:         String lookAndFeel = null;
samer@1: 
samer@1:         if (LOOKANDFEEL != null) {
samer@1:             if (LOOKANDFEEL.equals("Metal")) {
samer@1:                 lookAndFeel = UIManager.getCrossPlatformLookAndFeelClassName();
samer@1:             } else if (LOOKANDFEEL.equals("System")) {
samer@1:                 lookAndFeel = UIManager.getSystemLookAndFeelClassName();
samer@1:             } else if (LOOKANDFEEL.equals("Mac")) {
samer@1:                 lookAndFeel = "com.sun.java.swing.plaf.mac.MacLookAndFeel";
samer@1:                 //PENDING: check!
samer@1:             } else if (LOOKANDFEEL.equals("Windows")) {
samer@1:                 lookAndFeel = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
samer@1:             } else if (LOOKANDFEEL.equals("Motif")) {
samer@1:                 lookAndFeel = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
samer@1:             }
samer@1: 
samer@1:             if (DEBUG) {
samer@1:                 System.out.println("About to request look and feel: " 
samer@1:                                    + lookAndFeel);
samer@1:             }
samer@1: 
samer@1:             try {
samer@1:                 UIManager.setLookAndFeel(lookAndFeel);
samer@1:             } catch (ClassNotFoundException e) {
samer@1:                 System.err.println("Couldn't find class for specified look and feel:"
samer@1:                                    + lookAndFeel);
samer@1:                 System.err.println("Did you include the L&F library in the class path?");
samer@1:                 System.err.println("Using the default look and feel.");
samer@1:             } catch (UnsupportedLookAndFeelException e) {
samer@1:                 System.err.println("Can't use the specified look and feel ("
samer@1:                                    + lookAndFeel
samer@1:                                    + ") on this platform.");
samer@1:                 System.err.println("Using the default look and feel.");
samer@1:             } catch (Exception e) { 
samer@1:                 System.err.println("Couldn't get specified look and feel ("
samer@1:                                    + lookAndFeel
samer@1:                                    + "), for some reason.");
samer@1:                 System.err.println("Using the default look and feel.");
samer@1:                 e.printStackTrace();
samer@1:             } 
samer@1:         }
samer@1:     }
samer@1: 
samer@1:     public static void main(String[] args) {
samer@1:         initLookAndFeel();
samer@1:         Converter converter = new Converter();
samer@1: 
samer@1:         //Create a new window.
samer@1:         JFrame f = new JFrame("Converter");
samer@1:         f.addWindowListener(new WindowAdapter() {
samer@1:             public void windowClosing(WindowEvent e) {
samer@1:                 System.exit(0);
samer@1:             }
samer@1:         });
samer@1: 
samer@1:         //Add the JPanel to the window and display the window.
samer@1:         //We can use a JPanel for the content pane because
samer@1:         //JPanel is opaque.
samer@1:         f.setContentPane(converter.mainPane);
samer@1:         if (COLORS) {
samer@1:            //This has no effect, since the JPanel completely
samer@1:            //covers the content pane.
samer@1:            f.getContentPane().setBackground(Color.green);
samer@1:         }
samer@1: 
samer@1:         f.pack();        //Resizes the window to its natural size.
samer@1:         f.setVisible(true);
samer@1:     }
samer@1: }