package gve.calc.formula;

import java.awt.*;

public class StringPartView extends CursorPosLabel implements KeydnListener,View,MouseSensitive {
	private StringPart model;
	
	public StringPartView(StringPart model) {
		super("");
		setForeground(Color.blue);
		this.model = model;
		MVC.registerView(model,this);
		updateView(null);
	}

	
 Model has changed; reflect changes visually. 
	public void updateView(Object arg) {
		setText("\""+model.getString()+"\"");
	}

	public Object getModel() { return model; }

	public boolean mousePressed(int flags,int x,int y) { return false; }

	// almost same as StaticStringView.mouseDown
	public void mouseDown(int flags,int x,int y) {
		FontMetrics fm = getFontMetrics(getFont());
		String string = getText();
		int len = string.length();
		FormulaView view = FormulaView.get(this);
		for (int i = 0; i < len; i++) {
			int w = fm.charWidth(string.charAt(i));
			if (x < w/2) {
				view.setCursorComp(this,i);
				return;
			}
			x -= w;	// advance one letter to the right
		}
		// Place cursor at the rightmost position
		view.setCursorComp(this,len);
	}

	public boolean keydn(int key) {
		int cp = getCursorPos();
		switch(key) {
		case Key_LEFT:
			if (cp > 0) {
				setCursorPos(cp - 1);
				repaint();
				return true;
			}
			break;
		case Key_RIGHT:
			if (cp < getText().length()) {
				setCursorPos(cp + 1);
				repaint();
				return true;
			}
			break;
		case Key_BS:
			if (cp==0 || cp==getText().length()) {
				// oopsie
			} else {
				if (cp == 1) return true;
				String txt = model.getString();
				txt = txt.substring(0,cp-2) + txt.substring(cp-1);
				model.setString(txt);
				setCursorPos(cp-1);
			}
			invalidate();
			return true;
		case Key_DEL:
			if (cp==0 || cp==getText().length()) {
				// oops
			} else {
				String txt = model.getString();
				if (cp-1 == txt.length()) return true;
				txt = txt.substring(0,cp-1) + txt.substring(cp);
				model.setString(txt);
			}
			invalidate();
			return true;
		default:
			if (key < 32) return false;
			{	String txt = model.getString();
				txt = new String(new StringBuffer(txt).insert(cp-1,(char)key));
				setCursorPos(cp + 1);
				invalidate();	// mark me for resizing
				model.setString(txt);
			}
			return true;
		}
		return false;
	}
}