package gve.calc.formula;

import java.awt.*;

public class CursorLabel extends Component {
	private int cursorPos;
	private String text;
	private boolean transparent = true;

	public CursorLabel(String str) {
		this(str,-1);
	}

	public CursorLabel(String str,int pos) {
		text = str;
		cursorPos = pos;
	}

	
 Negative arguments cause the cursor to disappear. 
	public void setCursorPos(int pos) {
		cursorPos = pos;
		repaint();
	}

	public void setForeground(Color c) {
		transparent = false;
		super.setForeground(c);
	}

	public void setBackground(Color c) {
		transparent = false;
		super.setBackground(c);
	}

	public boolean isTransparent() { return transparent; }

	public void setTransparent(boolean transp) { transparent = transp; repaint(); }

	public int getCursorPos() { return cursorPos; }

	public String getText() { return text; }

	public void setText(String str) {
		text = str;
		repaint();
	}

	public Dimension getMinimumSize() { return getPreferredSize(); }

	public Dimension getPreferredSize() {
		FontMetrics fm;
		try { fm = getFontMetrics(getFont()); }
		catch (Exception exc) { return new Dimension(5,5); }
		return new Dimension(fm.stringWidth(text) + (cursorPos>=0 ? fm.charWidth(' ') : 0),fm.getHeight());
	}

	public void paint(Graphics g) {
//try { throw new Error("hehe"); } catch (Error err) { err.printStackTrace(); }
		Dimension siz = getSize();
		if (!transparent) {
			g.setColor(getBackground());
//g.setColor(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
//System.out.println("Paint CursorLabel "+text+" with cursor@"+cursorPos+" -> size "+siz+" clip "+g.getClipBounds());
			g.fillRect(0,0,siz.width,siz.height);
		}
		g.setColor(getForeground());
		FontMetrics fm = g.getFontMetrics();
		int ascent = fm.getAscent();
		if (cursorPos < 0) {
			g.drawString(text,0,ascent);
			return;
		}
		g.drawString(text.substring(0,cursorPos),0,ascent);
		int x = fm.stringWidth(text.substring(0,cursorPos));
		int spacewidth = fm.charWidth(' ');
		g.fillRect(x,0,spacewidth,fm.getHeight());
//System.out.println("\tPainted "+text.substring(cursorPos)+" @"+(x+spacewidth));
		g.drawString(text.substring(cursorPos),x+spacewidth,ascent);
	}

	public void update(Graphics g) { paint(g); }

	protected String paramString() {
		return text+","+super.paramString();
	}
}