import java.awt.*;
import java.applet.Applet;


/**
 *	ParamInput.java:	Defines a panel object that is used for inputing
 *						parameter values (using a text field).
 *
 *	Written in:	Java 1.0.2
 *
 *	@author		Joseph A. Huwaldt	Date:	November 23, 1997
 *	@author		Joseph A. Huwaldt	Date:	December 2, 1997
 *	@version	December 2, 1997
 **/
class ParamInput extends Panel {
//	Define class variables here
	TextField		theTField;		//	TextField for inputting a value to this parameter.
	Param			theParam;		//	The parameter that this input panel refers to.
	
	
	/**
	* Constructor():
	*
	*	Written by:		Joseph A. Huwaldt		Date:	November 23, 1997
	*	Modified by:	Joseph A. Huwaldt		Date:	November 30, 1997
	*
	*	@param		param	The Param object that this input field should use.
	*	@return		No return value
	**/
	ParamInput(Param param) {
		theParam = param;
		
		//	Create layout
		setLayout(new BorderLayout());
		
		//	Create the label for this parameter.
		Label theLabel = new Label(theParam.getLabel() + " =", Label.RIGHT);
		add("West", theLabel);
		
		//	Create text input field for this parameter.
		if (param.isDefined())
			theTField = new TextField( param.toString(), 10 );
		else
			theTField = new TextField("", 10);
		add("Center", theTField);
		
		//	Create holding space for help button.
		Label tmplabel = new Label(" ");
		add("South", tmplabel);
		
		//	Create holding space for units label.
		Label unitsLabel = new Label(" ");
		add("East", unitsLabel);
		
	}	//	end ParamInput() Constructor.


	/**
	* insets():	We are adding an inset to our Applet panel.  This is
	*			called by the container to determine our insets.
	*
	*	Written by:		Joseph A. Huwaldt		Date:	November 22, 1997
	*	Modified by:	Joseph A. Huwaldt		Date:	November 29, 1997
	*
	*	@param		No prameters
	*	@return		An Insets object is returned.
	**/
	public Insets insets() {
		return new Insets(5,0,5,0);
	}	//	end insets()


	/**
	* getInput():	Reads the value input in the text field and puts it into
	*				the corresponding parameter.  The value is also returned
	*				as a float.  If the TextEdit field is empty, Float.NaN
	*				is returned and placed in the parameter object.
	*
	*	Written by:		Joseph A. Huwaldt		Date:	November 23, 1997
	*	Modified by:	Joseph A. Huwaldt		Date:	November 23, 1997
	*
	*	@param		No prameters
	*	@return		The float value in the TextField is returned.
	*	@exception	NumberFormatException	If something other than a number is
	*										entered, this exception is thrown.
	**/
	public float getInput() throws NumberFormatException {
		String	s = theTField.getText();
		theParam.setValue( s );
		return theParam.getValue();
		
	}


	/**
	* focusLost():	This is called if the user has changed focus off of this
	*				parameter item.
	*
	*	Written by:		Joseph A. Huwaldt		Date:	November 23, 1997
	*	Modified by:	Joseph A. Huwaldt		Date:	November 29, 1997
	*
	*	@param		FocusEvent	A focus event event object is passed from system.
	*	@return		No value returned
	**/
/*	public void focusLost(FocusEvent e) {
		theApplet.update();
	}
*/

}	//	end ParamInput class