samer@0: /*
samer@0:  *	MatrixPanel.java	
samer@0:  *
samer@0:  *	Copyright (c) 2000, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
samer@0:  *	without even the implied warranty of MERCHANTABILITY or 
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.maths;
samer@0: 
samer@0: import java.awt.*;
samer@0: import java.awt.event.*;
samer@0: import java.text.*;
samer@0: import samer.core.types.*;
samer@0: import samer.core.util.*;
samer@0: import samer.core.*;
samer@0: 
samer@0: /**
samer@0: 	A text based matrix editor
samer@0:   */
samer@0: 
samer@0: public class MatrixPanel extends BaseViewer
samer@0: 	implements FocusListener, ActionListener
samer@0: {
samer@0: 	int			rowdim, coldim;
samer@0: 	Matrix		M;
samer@0: 	Field[][]	TF;
samer@0: 	boolean		isvalid;
samer@0: 	String		errmsg;
samer@0: 	boolean		readonly;
samer@0: 	Color			validColor, badColor;
samer@0: 
samer@0: 	public MatrixPanel( Matrix A) { this(A,true); }
samer@0: 	public MatrixPanel( Matrix A, boolean qedit) 
samer@0: 	{
samer@0: 		super(A.observable());
samer@0: 
samer@0: 		int m = A.getRowDimension();
samer@0: 		int n = A.getColumnDimension();
samer@0: 
samer@0: 		readonly = !qedit;
samer@0: 
samer@0: 		/* initialize to all 0 */
samer@0: 		int i, j;
samer@0: 		setLayout(new GridLayout(m,n,2,2));
samer@0: 		rowdim = m; coldim = n;
samer@0: 		M = A;
samer@0: 
samer@0: 		TF = new Field[m][n];
samer@0: 		isvalid = true;
samer@0: 		for (i=0; i < m; i++) {
samer@0: 			for (j=0; j < n; j++){
samer@0: 				TF[i][j] = new Field(6);
samer@0: 				TF[i][j].setEditable(qedit);
samer@0: 				add(TF[i][j]);
samer@0: 			}
samer@0: 		}
samer@0: 
samer@0: 		validColor = TF[0][0].getForeground();
samer@0: 		badColor   = Color.red;
samer@0: 		update(null,null);
samer@0: 	}
samer@0: 
samer@0: 	public void update(java.util.Observable o, Object src) 
samer@0: 	{
samer@0: 		if (src!=this) { // &&&
samer@0: 			for (int i=0; i < rowdim; i++) {
samer@0: 				for (int j=0; j< coldim; j++) {
samer@0: 					TF[i][j].setForeground(validColor);
samer@0: 					TF[i][j].setText(numfmt._format(M.get(i,j)));
samer@0: 					TF[i][j].edited=false;
samer@0: 				}
samer@0: 			}
samer@0: 		}
samer@0: 		super.update(o,src);
samer@0: 	}
samer@0: 
samer@0: 
samer@0: 	boolean Validate(boolean qcheck)
samer@0: 	{
samer@0: 		/* check validity of all edited entries and change M
samer@0: 		   If qcheck is true, check all entries
samer@0: 		*/
samer@0: 		String newtext="";
samer@0: 		isvalid = true;
samer@0: 		for (int i=0; i < rowdim; i++) {
samer@0: 			for (int j=0; j < coldim; j++) {
samer@0: 				if (TF[i][j].edited || qcheck) {
samer@0: 					try {
samer@0: 						newtext = TF[i][j].getText().trim();
samer@0: 						double newv = numfmt._parse(newtext);
samer@0: 						M.set(i,j,newv);
samer@0: 						TF[i][j].setForeground(validColor);
samer@0: 						TF[i][j].edited = false;
samer@0: 						TF[i][j].repaint();
samer@0: 					} catch( Exception ex) {
samer@0: 						TF[i][j].setForeground(badColor);
samer@0: 						TF[i][j].repaint();
samer@0: 						isvalid = false;
samer@0: 						if (ex instanceof NumberFormatException) 
samer@0: 							errmsg = "Invalid number:"+newtext;
samer@0: 						else errmsg = ex.getMessage();
samer@0: 						Shell.print(errmsg);
samer@0: 					}
samer@0: 				}
samer@0: 			}
samer@0: 		}
samer@0: 
samer@0: 		if (isvalid) M.changed(this);
samer@0: 		return isvalid;
samer@0: 	} 
samer@0:       
samer@0: 	public void focusGained( FocusEvent e) {}
samer@0: 	public void focusLost( FocusEvent e) { 
samer@0: 		if (!readonly) { 
samer@0: 			Component c=e.getComponent();
samer@0: 			if (c instanceof Field) {
samer@0: 				((Field)c).edited=true; 
samer@0: 				Validate(false); 
samer@0: 			}
samer@0: 		}
samer@0: 	}
samer@0: 	public void actionPerformed( ActionEvent e)
samer@0: 	{
samer@0: 		// could mean return pressed in a field
samer@0: 		Object c=e.getSource();
samer@0: 		if (c instanceof Field) {
samer@0: 			((Field)c).edited=true; 
samer@0: 			Validate(false); 
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	static DoubleFormat numfmt=new DoubleFormat(3);
samer@0: 
samer@0: 	class Field extends TextField
samer@0: 	{
samer@0: 		boolean edited=false;
samer@0: 
samer@0: 		public Field(int cols)
samer@0: 		{ 
samer@0: 			super(cols); 
samer@0: 			this.addFocusListener(MatrixPanel.this);
samer@0: 			this.addActionListener(MatrixPanel.this);
samer@0: 		}
samer@0: 	}  
samer@0: }