/*
 * NumSlider
 * 
 * Version 1.1 - Java 1.1 compatible
 *
 * Dec 6 2001
 * 
 * Copyright 2001 David Joiner and the Shodor Education Foundation
 */
import java.awt.*;
import java.awt.event.*;
import com.helplets.awt.*;
//import org.shodor.utils.*;

/**
 * NumSlider extends the functionality of a Slider by including
 * a NumInput for users to type into directly.
 */
public class NumSlider extends Panel implements ActionListener,AdjustmentListener {

    protected ActionListener actionListener;

    protected Slider theSlider;
    protected NumInput theInput;
    
    protected int sigDigits = 3;

    /*
     * Constructors
     */

    public NumSlider(double sliderValue, double sliderMin,
            double sliderMax) {
        this(20,Slider.STYLE_LINEAR,sliderValue,sliderMin,sliderMax);
    }

    public NumSlider() {
        this(20,Slider.STYLE_LINEAR,0.0,0.0,10.0);
    }

    public NumSlider(int sliderStyle,
            double sliderValue, double sliderMin,
            double sliderMax) {
        this(20,sliderStyle,sliderValue,sliderMin,sliderMax);
    }

    public NumSlider(int border, int sliderStyle,
            double sliderValue, double sliderMin,
            double sliderMax) {
        super();
        
        theSlider = new Slider(sliderStyle, sliderValue, sliderMin, sliderMax);
        theInput = new NumInput(
            new String(""+sliderValue),10,NumInput.DOUBLE);
        
        setLayout(new PercentLayout());
        add("left=0, right="+border+", top=0, bottom=100",theInput);
        add("left="+(border+1)+", right=100, top=0, bottom=100",theSlider);

        theInput.addActionListener(this);
        theSlider.addAdjustmentListener(this);
    }

    
    /*
     * Set and Get methods
     */
     
    public void setRealValue(double realValue) {
        theInput.setText(""+realValue);
        theSlider.setRealValue(realValue);
        postNumSliderChanged();
    }
    
    public double getRealValue() {
        return theInput.getDouble();
    }
    
    public void setRealMax(double realMax) {
        theSlider.setRealMax(realMax);
    }
    
    public double getRealMax() {
        return theSlider.getRealMax();
    }
    
    public void setRealMin(double realMin) {
        theSlider.setRealMin(realMin);
    }
    
    public double getRealMin() {
        return theSlider.getRealMin();
    }
    
    /*
     * Event handling
     */
        
    public void adjustmentValueChanged(AdjustmentEvent e) {
        if(e.getAdjustable() == theSlider) {
            theInput.setText(""+
                Double.valueOf(
                StrLib.round(theSlider.getRealValue(),sigDigits)).
                doubleValue()
            );
            postNumSliderChanged();
        }
    }
    
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == theInput) {
            theInput.setText(""+
                Double.valueOf(
                StrLib.round(theInput.getDouble(),sigDigits)).
                doubleValue()
            );
            theSlider.setRealValue(theInput.getDouble());
            postNumSliderChanged();
        }
    }
    
    public void addActionListener(ActionListener l) {
        actionListener =
            AWTEventMulticaster.add(actionListener, l);
    }
    
    public void postNumSliderChanged() {
        if (actionListener != null)
            actionListener.actionPerformed(
                new ActionEvent(this,
                ActionEvent.ACTION_PERFORMED,
                "NumSlider Changed"));    
    }
}