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SUBJECT.C
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1980-01-03
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/*
* Copyright (c) 1987, 1988, 1989 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 subject base class.
*/
#include <InterViews/interactor.h>
#include <InterViews/subject.h>
Subject::Subject() {
views = nil;
}
Subject::~Subject() {
register ViewList* v, * next;
for (v = views; v != nil; v = next) {
next = v->next;
delete v;
}
}
void Subject::Attach(Interactor* i) {
ViewList* v = new ViewList;
v->element = i;
v->next = views;
views = v;
Reference();
}
void Subject::Detach(Interactor* i) {
register ViewList* v, * prev;
prev = nil;
for (v = views; v != nil; v = v->next) {
if (v->element == i) {
if (prev == nil) {
views = v->next;
} else {
prev->next = v->next;
}
delete v;
Unreference();
break;
}
prev = v;
}
}
void Subject::all(InteractorItr& i) {
i.cur = views;
}
void Subject::Notify() {
for (InteractorItr i(this); i.more(); i.next()) {
i.view()->Update();
}
}
boolean Subject::IsView(Interactor* v) {
for (InteractorItr i(this); i.more(); i.next()) {
if (i.view() == v) {
return true;
}
}
return false;
}