void ValuePlug::setObjectValue( IECore::ConstObjectPtr value )
{
bool haveInput = getInput<Plug>();
if( direction()==In && !haveInput )
{
// input plug with no input connection. there can only ever be a single value,
// which we store directly on the plug. when setting this we need to take care
// of undo, and also of triggering the plugValueSet signal and propagating the
// plugDirtiedSignal.
if( getFlags( ReadOnly ) )
{
// We don't allow static values to be set on read only plugs, so we throw.
// Note that it is perfectly acceptable to call setValue() on a read only
// plug during a computation because the result is not written onto the
// plug itself, so we don't make the check in the case that we call
// receiveResult() below. This allows plugs which have inputs to be made
// read only after having their input set.
throw IECore::Exception( boost::str( boost::format( "Cannot set value for read only plug \"%s\"" ) % fullName() ) );
}
if( value->isNotEqualTo( m_staticValue.get() ) )
{
Action::enact( new SetValueAction( this, value ) );
}
return;
}
// An input plug with an input connection or an output plug. We must be currently in a computation
// triggered by getObjectValue() for a setObjectValue() call to be valid (receiveResult will check this).
// We never trigger plugValueSet or plugDirtiedSignals during computation.
ComputeProcess::receiveResult( this, value );
}
