comparison src/samer/maths/MatrixPanel.java @ 0:bf79fb79ee13

Initial Mercurial check in.

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