/* Eric Jewart
   11/13/97
*/

package awb;
import java.awt.*;

public class DoubleField extends java.awt.Panel
{
    private TextField myField;
    private Label myLabel;

    public DoubleField()
    {
	myField = new TextField();
	setLayout(new BorderLayout());
	add("Center", myField);
    }

    public DoubleField(int cols)
    {
	myField = new TextField(cols);
	setLayout(new BorderLayout());
	add("Center", myField);
    }

    public DoubleField(double num, int cols)
    {
	myField = new TextField(Double.toString(num), cols);
	setLayout(new BorderLayout());
	add("Center", myField);
    }

    public double getDouble()
    {
	try
	{
	    double num = Double.valueOf(myField.getText()).doubleValue();
	    return num;
	}
	catch (NumberFormatException ex)
	{
	    return 0;
	}
    }

    public void setDouble(double num)
    {
	myField.setText(Double.toString(num));
    }

    public void addLabel(String lab)
    {
        if (myLabel == null) {
            myLabel = new Label(lab);
            remove(myField);
            add("West", myLabel);
            add("Center", myField);
        }
        else myLabel.setText(lab);
    }
        
    public void setLabel(String lab)
    {
	addLabel(lab);
    }

    public void setEditable(boolean b)
    {
        myField.setEditable(b); 
    }
        
    public int getColumns()
    {
        return myField.getColumns();  
    }
     
    public boolean keyDown(Event e, int key)
    {
	// System.out.println("typed: " + key);

	// numbers are always okay
	if ((key > 47) && (key < 58)) return super.keyDown(e,key);

	// one period is ok
	if ((key == 46) && (myField.getText().indexOf(".") < 0))
	    return super.keyDown(e,key);

	// minus sign okay if it's the first character
	if ((key == 45) && ((myField.getText().equals("")) 
		|| (myField.getText().equals(myField.getSelectedText()))))
	    return super.keyDown(e,key);

	// backspace and delete
	if ((key == 8) || (key == 127)) return super.keyDown(e,key);

	// arrow keys, home, end, pgup, pgdown okay
	if ((key > 999) && (key < 1008)) return super.keyDown(e,key);	

	// enter key, for action events
	if (key == 10) return super.keyDown(e,key);

	// no other keys should do anything, so ignore them all
	return true;
    }
}