//////////////////////////////////////////////////////////////////////////////
//                        DX SOURCEFILE					    //
//////////////////////////////////////////////////////////////////////////////

/*
 * $Header: /home/gda/dxcvs/dx/src/ui++/java/dx/runtime/Stepper.java,v 1.1.1.1 1999/03/24 15:17:32 gda Exp $
 */
package dx.runtime;
import java.applet.Applet;
import java.awt.*;
import java.io.*;
import java.lang.*;
import java.net.*;


//
//

public class Stepper extends Panel implements Notifier {
    //
    // private
    //
    private int decimal_places;
    private boolean integers = false;
    private double min = -1000000.0;
    private double max = 1000000.0;
    private double value = 0.0;
    private double step = 1.0;
    private boolean use_arrows = true;
    private ArrowButton left ;
    private ArrowButton right;
    private TextField txt;
    private Font local_font;
    private Color local_bg;
    private Color local_fg;
    private boolean initialized = false;
    private Notifier notifier = null;

public void callCallback (Object arrow)
{
    if (notifier != null)
	notifier.callCallback(this);
}

public void setValue(String v)
{
    double tmp = value;
    try {
	if (integers) {
	    value = Integer.valueOf(v).intValue();
	} else {
	    value = Float.valueOf(v).floatValue();
	}
	setText(v);
    } catch (NumberFormatException nfe) {
	System.out.println ("Illegal numeric entry: " + v);
	value = tmp;
	setText(getValue());
    }
}

private void setText(String newstr)
{
    StringBuffer sb = new StringBuffer(newstr);
    int len = sb.length();
    int i;
    boolean decimal_seen = false;
    boolean exp_seen = false;
    int decimal_digits = 0;
    for (i=0; i<len; i++) {
	char c;
	try {
	    c = sb.charAt(i);
	} catch (StringIndexOutOfBoundsException si) {
	    System.out.println ("index " + i + " is longer than " + len);
	    break;
	} 
	if (c == '.') {
	    decimal_seen = true;
	    continue;
	}
	if (c == 'E')
	    exp_seen = true;

	if ((decimal_seen) && (c>= '0') && (c<='9'))
	    decimal_digits++;

	if ((decimal_digits > decimal_places) && (exp_seen == false)) {
	    if ((c >= '0') && (c <= '9'))
		sb.setCharAt (i, '0');
	}
    }
    String s = new String(sb);
    try {
	if (integers) value = Integer.valueOf(s).intValue();
	else value = Float.valueOf(s).floatValue();
    } catch (NumberFormatException nfe) {
    }
    Float fl = new Float(s);
    if (integers)
	txt.setText(Integer.toString(fl.intValue()));
    else
	txt.setText(fl.toString());
}

public Stepper(Notifier snot)
{
    notifier = snot;
}

public void setValues (double mn, double mx, double stp, int places, double current)
{
    min = mn;
    max = mx;
    step = stp;
    value = current;
    integers = false;
    decimal_places = places;
    setText("" + value);
}

public void setValues (int mn, int mx, int stp, int current)
{
    min = (int)mn;
    max = (int)mx;
    step = stp;
    value = (int)current;
    integers = true;
    decimal_places = 0;
    setText("" + value);
}

public void setFont(Font newf)
{
    if (initialized == true) {
	txt.setFont(newf);
    }
    local_font = newf;
}

public boolean decrement()
{
    double tmp = value;
    value-= step;
    if (value < min)
	value = min;
    setText (getValue());
    if (value != tmp) return true;
    else return false;
}

public boolean increment()
{
    double tmp = value;
    value+= step;
    if (value > max)
	value = max;
    setText (getValue());
    if (value != tmp) return true;
    else return false;
}

public boolean action (Event e, Object o)
{
    if (e.target == txt) {
	String s = txt.getText();
	double tmp = value;
	try {
	    Float f = new Float(s);
	    if (integers == false) {
		value = f.floatValue();
		if ((value > max) || (value < min)) {
		    if (value < min) value = min;
		    if (value > max) value = max;
		    f = new Float(value);
		}
		setText (f.toString());
	    } else {
		Integer in = new Integer(f.intValue());
		value = in.intValue();
		if ((value > max) || (value < min)) {
		    if (value < min) value = min;
		    if (value > max) value = max;
		    f = new Float(value);
		    in = new Integer(f.intValue());
		}
		setText(in.toString());
	    }
	    if ((notifier != null) && (value != tmp))
		notifier.callCallback(this);
	} catch (NumberFormatException nfe) {
	    value = tmp;
	    System.out.println ("Illegal numeric entry: " + s);
	    setText(getValue());
	}
	return true;
    }
    return false;
}

public String getValue()
{
    Float f = new Float(value);
    if (integers) {
	Integer i = new Integer(f.intValue());
	return i.toString();
    } else
	return f.toString();
}

public void setBackground (Color newc)
{
    if (initialized == true) {
	txt.setBackground(Color.white);
	if (use_arrows) {
	    left.setBackground(newc);
	    right.setBackground(newc);
	}
    }
    local_bg = newc;
    super.setBackground(newc);
}

public void setForeground (Color newc)
{
    if (initialized == true) {
	txt.setForeground(Color.black);
	if (use_arrows) {
	    left.setForeground(newc);
	    right.setForeground(newc);
	}
    }
    local_bg = newc;
    super.setForeground(newc);
}

public void setUseArrows(boolean usem)
{
    if (initialized == true) return;
    use_arrows = usem;
}

//
//
//
public void init() 
{
    BorderLayout gbl = new BorderLayout(4, 4);
    setLayout(gbl);

    try {
	if (use_arrows) {
	    left = new ArrowButton(ArrowButton.LEFT, this);
	    add("West", left);

	    right = new ArrowButton(ArrowButton.RIGHT, this);
	    add("East", right);
	}

	txt = new TextField("", 10);
	add("Center", txt);
	txt.setBackground(Color.white);
	txt.setForeground(Color.black);

	if (local_bg != null) {
	    if (use_arrows) {
		left.setBackground(local_bg);
		right.setBackground(local_bg);
	    }
	}
	if (local_fg != null) {
	    if (use_arrows) {
		left.setForeground(local_fg);
		right.setForeground(local_fg);
	    }
	}
	if (local_font != null) 
	    txt.setFont (local_font);
    } catch (Exception e) {
	e.printStackTrace();
    }
    initialized = true;
}



} // end class Stepper