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: import java.text.NumberFormat;
samer@1: 
samer@1: public class ConversionPanel extends JPanel {
samer@1:     DecimalField textField;
samer@1:     JComboBox unitChooser;
samer@1:     JSlider slider;
samer@1:     ConverterRangeModel sliderModel;
samer@1:     Converter controller;
samer@1:     Unit[] units;
samer@1:     String title;
samer@1:     final static boolean DEBUG = false;
samer@1:     final static boolean COLORS = false;
samer@1:     final static int MAX = 10000;
samer@1: 
samer@1:     ConversionPanel(Converter myController, String myTitle, 
samer@1:                     Unit[] myUnits,
samer@1:                     ConverterRangeModel myModel) {
samer@1:         if (COLORS) {
samer@1:             setBackground(Color.cyan);
samer@1:         }
samer@1:         setBorder(BorderFactory.createCompoundBorder(
samer@1:                         BorderFactory.createTitledBorder(myTitle),
samer@1:                         BorderFactory.createEmptyBorder(5,5,5,5)));
samer@1: 
samer@1:         //Save arguments in instance variables.
samer@1:         controller = myController;
samer@1:         units = myUnits;
samer@1:         title = myTitle;
samer@1:         sliderModel = myModel;
samer@1: 
samer@1:         //Add the text field.  It initially displays "0" and needs
samer@1:         //to be at least 10 columns wide.
samer@1:         NumberFormat numberFormat = NumberFormat.getNumberInstance();
samer@1:         numberFormat.setMaximumFractionDigits(2);
samer@1:         textField = new DecimalField(0, 10, numberFormat); 
samer@1:         textField.setValue(sliderModel.getDoubleValue());
samer@1:         textField.addActionListener(new ActionListener() {
samer@1:             public void actionPerformed(ActionEvent e) {
samer@1:                 sliderModel.setDoubleValue(textField.getValue());
samer@1:             }
samer@1:         });
samer@1: 
samer@1:         //Add the combo box.
samer@1:         unitChooser = new JComboBox(); 
samer@1:         for (int i = 0; i < units.length; i++) { //Populate it.
samer@1:             unitChooser.addItem(units[i].description);
samer@1:         }
samer@1:         unitChooser.setSelectedIndex(0);
samer@1:         sliderModel.setMultiplier(units[0].multiplier);
samer@1:         unitChooser.addActionListener(new ActionListener() {
samer@1:             public void actionPerformed(ActionEvent e) {
samer@1:                 //Set new maximums for the sliders.
samer@1:                 int i = unitChooser.getSelectedIndex();
samer@1:                 sliderModel.setMultiplier(units[i].multiplier);
samer@1:                 controller.resetMaxValues(false);
samer@1:             }
samer@1:         });
samer@1: 
samer@1:         //Add the slider.
samer@1:         slider = new JSlider(sliderModel);
samer@1:         sliderModel.addChangeListener(new ChangeListener() {
samer@1:             public void stateChanged(ChangeEvent e) {
samer@1:                 textField.setValue(sliderModel.getDoubleValue());
samer@1:             }
samer@1:         });
samer@1: 
samer@1:         //Make the textfield/slider group a fixed size.
samer@1:         JPanel unitGroup = new JPanel() {
samer@1:             public Dimension getMinimumSize() {
samer@1:                 return getPreferredSize();
samer@1:             }
samer@1:             public Dimension getPreferredSize() {
samer@1:                 return new Dimension(150,
samer@1:                                      super.getPreferredSize().height);
samer@1:             }
samer@1:             public Dimension getMaximumSize() {
samer@1:                 return getPreferredSize();
samer@1:             }
samer@1:         };
samer@1:         if (COLORS) {
samer@1:             unitGroup.setBackground(Color.blue);
samer@1:         }
samer@1:         unitGroup.setBorder(BorderFactory.createEmptyBorder(
samer@1:                                                 0,0,0,5));
samer@1:         unitGroup.setLayout(new BoxLayout(unitGroup, 
samer@1:                                           BoxLayout.Y_AXIS));
samer@1:         unitGroup.add(textField);
samer@1:         unitGroup.add(slider);
samer@1: 
samer@1:         setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
samer@1:         add(unitGroup);
samer@1:         add(unitChooser);
samer@1:         unitGroup.setAlignmentY(TOP_ALIGNMENT);
samer@1:         unitChooser.setAlignmentY(TOP_ALIGNMENT);
samer@1:     }
samer@1: 
samer@1:     /** 
samer@1:      * Returns the multiplier (units/meter) for the currently
samer@1:      * selected unit of measurement.
samer@1:      */
samer@1:     public double getMultiplier() {
samer@1:         return sliderModel.getMultiplier();
samer@1:     }
samer@1: 
samer@1:     public double getValue() {
samer@1:         return sliderModel.getDoubleValue();
samer@1:     }
samer@1: }