🚀 go-pugleaf

In article <1991Jun5.141228@Pkg.Mcc.COM> steve@Pkg.Mcc.COM (Steve Madere) writes:
>
>What we had to do was to take over the run
>operation during display of the MD and refuse
>to pass on any events occurring outside the
>bounds of the local scene to their targets.
>
>Ours looks rather kludgey since it requires 
>finding out what the boundary of the dialog box
>is and then checking every event to see if it 
>occurred within this box.

I created a similar class for IV 2.6. The class re-defines
the Dialog Accept() member function to filter events
but instead of using the boundary, it checks
the event target field against each of the interactors
within the dialog box.

------------

/*
	Accept() is the same as for Dialog class except that non-Dialog
	events are filtered.
*/

boolean ExclusiveDialog::Accept() {
    Event e;
    int v;

    state->SetValue(0);
    v = 0;
    do {
        Read(e);
	if (IsTargetInside(e.target, this)) {
        	e.target->Handle(e);
	};
        state->GetValue(v);
    } while (v == 0 && e.target != nil);
    return v == 1 || e.target == nil;
}

/*
	IsTargetInside() determines whether a given target is the same
	as the passed interactor i or is contained within i.
*/

boolean ExclusiveDialog::IsTargetInside(Interactor* target, Interactor* i) {
	if (i == target) return true;
	int num;
	Interactor** intTable;
	i->GetComponents(0, 0, intTable, num);
	for(int j = 0; j < num; j++) {
		if (IsTargetInside(target, intTable[j])) {
			return true;
		};
	};
	if (num) delete [num] intTable;
	return false;
}

--------------

If anyone has found a better way, I'd like to hear from you please.

Michael Rizzo