/*
 * Copyright (c) 1990, 1991 Stanford University
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Stanford not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  Stanford makes no representations about
 * the suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * STANFORD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
 * IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Implementation of StateVarView base class.
 */

#include <Unidraw/statevar.h>
#include <Unidraw/stateview.h>

/*****************************************************************************/

StateVarView::StateVarView (StateVar* s) {
    _subject = s;
    _subject->Attach(this);
}

StateVarView::~StateVarView () {
    if (_subject != nil) _subject->Detach(this);
}

void StateVarView::Init () { }
boolean StateVarView::Stale () { return true; }
void StateVarView::SetSubject (StateVar* s) { _subject = s; }
StateVar* StateVarView::GetSubject () { return _subject; }

void StateVarView::Reconfig () { 
    Init();
    MonoScene::Reconfig();
}

void StateVarView::Update () {
    if (Stale()) {
        Init();
        Draw();
    }
}