Copyright (C) 1999, 2000, Geert Vernaeve 
package gve.calc.formula;

import java.awt.*;
import awt.Button;
import java.awt.event.*;

public class Matrix extends Tabular {
	private Part [][] elements;

	public Matrix(int height,int width) {
		if (height <= 0) throw new Error("invalid matrix height");
		if (width <= 0) throw new Error("invalid matrix width");
		elements = new Part[height][width];
		for (int i = 0; i < height; i++)
			for (int j = 0; j < width; j++) {
				elements[i][j] = new Identifier("");
				elements[i][j].parent = this;
			}
	}

	public int getHeight() { return elements.length; }
	public int getWidth() { return elements[0].length; }
	public Part elementAt(int i,int j) { return elements[i][j]; }
	public void setElementAt(int i,int j,Part el) { elements[i][j] = el; el.setParent(this); }

	public Object clone() {
		int h = getHeight();
		int w = getWidth();
		Matrix result = new Matrix(h,w);
		for (int i = 0; i < h; i++)
			for (int j = 0; j < w; j++) {
				result.elements[i][j] = (Part)elements[i][j].clone();
			}
		return result;
	}

	public Part evaluate(Evaluator ev) {
		return (Part)clone();
	}

	
 pos is the index of the new to be created row 
	public void insertRow(int pos) {
		int w = getWidth(), h = getHeight();
		Part [][] newel = new Part[h+1][w];
		for (int i = 0; i < h; i++) {
			if (i < pos) System.arraycopy(elements[i],0,newel[i],0,w);
			else System.arraycopy(elements[i],0,newel[i+1],0,w);
		}
		elements = newel;
		for (int j = 0; j < w; j++) setElementAt(pos,j,new Identifier());
		super.insertRow(pos);
	}

	public void insertCol(int pos) {
		int w = getWidth(), h = getHeight();
		Part [][] newel = new Part[h][w+1];
		for (int j = 0; j < w; j++) {
			int jtarget = j<pos ? j : j+1;
			for (int i = 0; i < h; i++) newel[i][jtarget] = elements[i][j];
		}
		elements = newel;
		for (int i = 0; i < h; i++) setElementAt(i,pos,new Identifier(""));
		super.insertCol(pos);
	}

	public void removeRow(int pos) {
		int w = getWidth(), h = getHeight();
		Part [][] newel = new Part[h-1][w];
		for (int i = 0; i < h; i++) {
			if (i < pos) System.arraycopy(elements[i],0,newel[i],0,w);
			else if (i == pos) ;
			else System.arraycopy(elements[i],0,newel[i-1],0,w);
		}
		elements = newel;
		super.removeRow(pos);
	}

	public Component createView(FormulaView view) {
		return new MatrixView(this,view);
	}
}