NSIndexSet* getSupportedViewConfigurations (NSArray<AUAudioUnitViewConfiguration*>* configs) override
    {
        auto supportedViewIndecies = [[NSMutableIndexSet alloc] init];
        auto n = [configs count];

        if (auto* editor = getAudioProcessor().createEditorIfNeeded())
        {
            for (auto i = 0u; i < n; ++i)
            {
                if (auto* viewConfiguration = [configs objectAtIndex:i])
                {
                    if (editor->supportsHostMIDIControllerPresence ([viewConfiguration hostHasController] == YES))
                    {
                        auto* constrainer = editor->getConstrainer();
                        auto height = (int) [viewConfiguration height];
                        auto width  = (int) [viewConfiguration width];

                        if (height <= constrainer->getMaximumHeight() && height >= constrainer->getMinimumHeight()
                         && width  <= constrainer->getMaximumWidth()  && width  >= constrainer->getMinimumWidth())
                            [supportedViewIndecies addIndex: i];
                    }
                }
            }
        }

        return [supportedViewIndecies autorelease];
    }

    void selectViewConfiguration (AUAudioUnitViewConfiguration* config) override
    {
        processorHolder->viewConfiguration.reset (new AudioProcessorHolder::ViewConfig { [config width], [config height], [config hostHasController] == YES });
    }