Copyright (C) 2000, 2001, Geert Vernaeve. All Rights Reserved. 
package gve.calc.formula;

import java.awt.*;

public class PrefixUnaryOpView extends HasBaselineContainer implements HasCursorPos,KeydnListener,View,MouseSensitive {
	private PrefixUnaryOp model;

	public PrefixUnaryOpView(PrefixUnaryOp model,FormulaView view) {
		this (model,view,new CursorPosLabel(model.getName()));
	}

	public PrefixUnaryOpView(PrefixUnaryOp model,FormulaView view,Component operatorView) {
		this.model = model;
		add(operatorView);
		add(view.getView(model.child));
		setLayout(new HorizontalLayoutMgr());
	}

	public void updateView(Object with) {
		System.out.println("PrefixUnaryOpView.updateView() error");
	}

	public Object getModel() { return model; }

	public void setCursorPos(int pos) {
		switch (pos) {
		case Somewhere_LEFT:
			getOperatorView().setCursorPos(Somewhere_LEFT);
			break;
		case Somewhere_RIGHT:
			FormulaView.get(this).setCursorPart(model.child,Somewhere_RIGHT);
			break;
		case Somewhere_MYLEFT:
			getOperatorView().setCursorPos(Somewhere_LEFT);
			break;
		case Somewhere_MYRIGHT:
			getOperatorView().setCursorPos(Somewhere_RIGHT);
			break;
		default:
			getOperatorView().setCursorPos(pos >= 0 ? pos : Somewhere);
		}
	}

	/* OperatorController expects this method to return a cursor position when the cursor
	 * is on us */
	public int getCursorPos() {
		int cp = getOperatorView().getCursorPos();
		if (cp >= 0) return cp;
		return Somewhere;
	}

	public void activate() {}

	public void deactivate() {
		getOperatorView().deactivate();
	}

	HasCursorPos getOperatorView() {
		return (HasCursorPos)getComponent(0);
	}

	public boolean keydn(int key) {
		FormulaView fview = FormulaView.get(this);
		HasCursorPos opView = getOperatorView();
		int cp = opView.getCursorPos();
		if (key == Key_LEFT) {
			if (cp > 0) {
				opView.setCursorPos(cp - 1);
				return true;
			} else if (cp == 0) {
				return false;
			} else if (Part.isDescendantOr(fview.getCursorPart(),model.child)) {
				// Cannot go more to the left in a (sub)child on the right side
				// so move to the middle
				fview.setCursorComp(this,Somewhere_LEFT);
				opView.setCursorPos(model.getName().length());
				return true;
			}
			return false;
		} else if (key == Key_RIGHT) {
			if (cp < 0) return false;
			if (cp < model.getName().length()) {
				opView.setCursorPos(cp + 1);
				return true;
			} else {
				fview.setCursorPart(model.child,Somewhere_LEFT);
				return true;
			}
		}
		return OperatorController.keydn(key,this);
	}

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

	// See also InfixBinaryOpView.mouseDown
	public void mouseDown(int flags,int x,int y) {
		FormulaView view = FormulaView.get(this);
		int w = getComponent(0).getSize().width/2;
		view.setCursorComp(this,x<w ? Somewhere_MYLEFT : Somewhere_MYRIGHT);
	}
}