//Author: ^-^ Veerle ^-^
import javax.swing.JTextField;
import java.awt.event.*;

public class currencyConverter2K implements KeyListener //Class used for testing the numbers input for currencies
{

	public currencyConverter2K ()
	{
	}
	
	public void keyTyped(KeyEvent e)
	{
		
		//Instead of trying to find which txt field was used, this creates a temp copy of that txt field by converting the source into
		//a txt field.
		JTextField txtTemp = (JTextField)e.getSource();
		String strBuffer = txtTemp.getText();
		boolean removeKey = false; //Flag used for if the key should be removed or not
		char c = e.getKeyChar(); //Get the key that was pressed
		
		if (c == ' ') //If space
		{
			removeKey = true;
		}
		else if (strBuffer.indexOf('.') != -1 && c == '.') //If a decimal place already exists, and the user has typed another decimal place
		{
			removeKey = true;
		}
		//If char is not a digit, not back space, not delete and not a decimal place
		else if (!((Character.isDigit(c)) || (c == KeyEvent.VK_BACK_SPACE) || (c == KeyEvent.VK_DELETE) || (c == '.')))
		{
			removeKey = true;				
		}
		
		if (!removeKey && strBuffer.indexOf('.') != -1) //If a decimal place exists, and the key at the momment is still legal
		{
			
			int decimalPosition = strBuffer.indexOf('.'); //Get the index number of the decimal place
			int decimalPlaces = (strBuffer.length() - 1) - decimalPosition; //Counts how many numbers exist after the decimal place
			
			//If two decimal places exist AND current text position is past the decimal position AND entered key is NOT backspace OR delete
			if (decimalPlaces >= 2 && (txtTemp.getSelectionStart() > decimalPosition) && !((c == KeyEvent.VK_BACK_SPACE) || (c == KeyEvent.VK_DELETE)))
			{
				removeKey = true;
			}
			
		}
		
		if (removeKey)
		{
			e.consume(); //Consumes the current key so it is not used
		}
			
	}
	
	public void keyPressed(KeyEvent e)
	{
	}
	
	public void keyReleased(KeyEvent e)
	{
	}
	
}