JUCE/extras/AudioPluginHost/Source/UI/MainHostWindow.cpp

/*
  ==============================================================================

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#include <JuceHeader.h>
#include "MainHostWindow.h"
#include "../Plugins/InternalPlugins.h"

constexpr const char* scanModeKey = "pluginScanMode";

class CustomPluginScanner  : public KnownPluginList::CustomScanner,
                             private ChangeListener
{
public:
    CustomPluginScanner()
    {
        if (auto* file = getAppProperties().getUserSettings())
            file->addChangeListener (this);

        changeListenerCallback (nullptr);
    }

    ~CustomPluginScanner() override
    {
        if (auto* file = getAppProperties().getUserSettings())
            file->removeChangeListener (this);
    }

    bool findPluginTypesFor (AudioPluginFormat& format,
                             OwnedArray<PluginDescription>& result,
                             const String& fileOrIdentifier) override
    {
        if (scanInProcess)
        {
            superprocess = nullptr;
            format.findAllTypesForFile (result, fileOrIdentifier);
            return true;
        }

        if (superprocess == nullptr)
        {
            superprocess = std::make_unique<Superprocess> (*this);

            std::unique_lock<std::mutex> lock (mutex);
            connectionLost = false;
        }

        MemoryBlock block;
        MemoryOutputStream stream { block, true };
        stream.writeString (format.getName());
        stream.writeString (fileOrIdentifier);

        if (superprocess->sendMessageToWorker (block))
        {
            std::unique_lock<std::mutex> lock (mutex);
            gotResponse = false;
            pluginDescription = nullptr;

            for (;;)
            {
                if (condvar.wait_for (lock,
                                      std::chrono::milliseconds (50),
                                      [this] { return gotResponse || shouldExit(); }))
                {
                    break;
                }
            }

            if (shouldExit())
            {
                superprocess = nullptr;
                return true;
            }

            if (connectionLost)
            {
                superprocess = nullptr;
                return false;
            }

            if (pluginDescription != nullptr)
            {
                for (const auto* item : pluginDescription->getChildIterator())
                {
                    auto desc = std::make_unique<PluginDescription>();

                    if (desc->loadFromXml (*item))
                        result.add (std::move (desc));
                }
            }

            return true;
        }

        superprocess = nullptr;
        return false;
    }

    void scanFinished() override
    {
        superprocess = nullptr;
    }

private:
    class Superprocess  : private ChildProcessCoordinator
    {
    public:
        explicit Superprocess (CustomPluginScanner& o)
            : owner (o)
        {
            launchWorkerProcess (File::getSpecialLocation (File::currentExecutableFile), processUID, 0, 0);
        }

        using ChildProcessCoordinator::sendMessageToWorker;

    private:
        void handleMessageFromWorker (const MemoryBlock& mb) override
        {
            auto xml = parseXML (mb.toString());

            const std::lock_guard<std::mutex> lock (owner.mutex);
            owner.pluginDescription = std::move (xml);
            owner.gotResponse = true;
            owner.condvar.notify_one();
        }

        void handleConnectionLost() override
        {
            const std::lock_guard<std::mutex> lock (owner.mutex);
            owner.pluginDescription = nullptr;
            owner.gotResponse = true;
            owner.connectionLost = true;
            owner.condvar.notify_one();
        }

        CustomPluginScanner& owner;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Superprocess)
    };

    void changeListenerCallback (ChangeBroadcaster*) override
    {
        if (auto* file = getAppProperties().getUserSettings())
            scanInProcess = (file->getIntValue (scanModeKey) == 0);
    }

    std::unique_ptr<Superprocess> superprocess;
    std::mutex mutex;
    std::condition_variable condvar;
    std::unique_ptr<XmlElement> pluginDescription;
    bool gotResponse = false;
    bool connectionLost = false;

    std::atomic<bool> scanInProcess { true };

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (CustomPluginScanner)
};

//==============================================================================
class CustomPluginListComponent  : public PluginListComponent
{
public:
    CustomPluginListComponent (AudioPluginFormatManager& manager,
                               KnownPluginList& listToRepresent,
                               const File& pedal,
                               PropertiesFile* props,
                               bool async)
        : PluginListComponent (manager, listToRepresent, pedal, props, async)
    {
        addAndMakeVisible (validationModeLabel);
        addAndMakeVisible (validationModeBox);

        validationModeLabel.attachToComponent (&validationModeBox, true);
        validationModeLabel.setJustificationType (Justification::right);
        validationModeLabel.setSize (100, 30);

        auto unusedId = 1;

        for (const auto mode : { "In-process", "Out-of-process" })
            validationModeBox.addItem (mode, unusedId++);

        validationModeBox.setSelectedItemIndex (getAppProperties().getUserSettings()->getIntValue (scanModeKey));

        validationModeBox.onChange = [this]
        {
            getAppProperties().getUserSettings()->setValue (scanModeKey, validationModeBox.getSelectedItemIndex());
        };

        resized();
    }

    void resized() override
    {
        PluginListComponent::resized();

        const auto& buttonBounds = getOptionsButton().getBounds();
        validationModeBox.setBounds (buttonBounds.withWidth (130).withRightX (getWidth() - buttonBounds.getX()));
    }

private:
    Label validationModeLabel { {}, "Scan mode" };
    ComboBox validationModeBox;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (CustomPluginListComponent)
};

//==============================================================================
class MainHostWindow::PluginListWindow  : public DocumentWindow
{
public:
    PluginListWindow (MainHostWindow& mw, AudioPluginFormatManager& pluginFormatManager)
        : DocumentWindow ("Available Plugins",
                          LookAndFeel::getDefaultLookAndFeel().findColour (ResizableWindow::backgroundColourId),
                          DocumentWindow::minimiseButton | DocumentWindow::closeButton),
          owner (mw)
    {
        auto deadMansPedalFile = getAppProperties().getUserSettings()
                                   ->getFile().getSiblingFile ("RecentlyCrashedPluginsList");

        setContentOwned (new CustomPluginListComponent (pluginFormatManager,
                                                        owner.knownPluginList,
                                                        deadMansPedalFile,
                                                        getAppProperties().getUserSettings(),
                                                        true), true);

        setResizable (true, false);
        setResizeLimits (300, 400, 800, 1500);
        setTopLeftPosition (60, 60);

        restoreWindowStateFromString (getAppProperties().getUserSettings()->getValue ("listWindowPos"));
        setVisible (true);
    }

    ~PluginListWindow() override
    {
        getAppProperties().getUserSettings()->setValue ("listWindowPos", getWindowStateAsString());
        clearContentComponent();
    }

    void closeButtonPressed() override
    {
        owner.pluginListWindow = nullptr;
    }

private:
    MainHostWindow& owner;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (PluginListWindow)
};

//==============================================================================
MainHostWindow::MainHostWindow()
    : DocumentWindow (JUCEApplication::getInstance()->getApplicationName(),
                      LookAndFeel::getDefaultLookAndFeel().findColour (ResizableWindow::backgroundColourId),
                      DocumentWindow::allButtons)
{
    formatManager.addDefaultFormats();
    formatManager.addFormat (new InternalPluginFormat());

    auto safeThis = SafePointer<MainHostWindow> (this);
    RuntimePermissions::request (RuntimePermissions::recordAudio,
                                 [safeThis] (bool granted) mutable
                                 {
                                     auto savedState = getAppProperties().getUserSettings()->getXmlValue ("audioDeviceState");
                                     safeThis->deviceManager.initialise (granted ? 256 : 0, 256, savedState.get(), true);
                                 });

   #if JUCE_IOS || JUCE_ANDROID
    setFullScreen (true);
   #else
    setResizable (true, false);
    setResizeLimits (500, 400, 10000, 10000);
    centreWithSize (800, 600);
   #endif

    knownPluginList.setCustomScanner (std::make_unique<CustomPluginScanner>());

    graphHolder.reset (new GraphDocumentComponent (formatManager, deviceManager, knownPluginList));

    setContentNonOwned (graphHolder.get(), false);

    setUsingNativeTitleBar (true);

    restoreWindowStateFromString (getAppProperties().getUserSettings()->getValue ("mainWindowPos"));

    setVisible (true);

    InternalPluginFormat internalFormat;
    internalTypes = internalFormat.getAllTypes();

    if (auto savedPluginList = getAppProperties().getUserSettings()->getXmlValue ("pluginList"))
        knownPluginList.recreateFromXml (*savedPluginList);

    for (auto& t : internalTypes)
        knownPluginList.addType (t);

    pluginSortMethod = (KnownPluginList::SortMethod) getAppProperties().getUserSettings()
                            ->getIntValue ("pluginSortMethod", KnownPluginList::sortByManufacturer);

    knownPluginList.addChangeListener (this);

    if (auto* g = graphHolder->graph.get())
        g->addChangeListener (this);

    addKeyListener (getCommandManager().getKeyMappings());

    Process::setPriority (Process::HighPriority);

  #if JUCE_IOS || JUCE_ANDROID
    graphHolder->burgerMenu.setModel (this);
  #else
   #if JUCE_MAC
    setMacMainMenu (this);
   #else
    setMenuBar (this);
   #endif
  #endif

    getCommandManager().setFirstCommandTarget (this);
}

MainHostWindow::~MainHostWindow()
{
    pluginListWindow = nullptr;
    knownPluginList.removeChangeListener (this);

    if (auto* g = graphHolder->graph.get())
        g->removeChangeListener (this);

    getAppProperties().getUserSettings()->setValue ("mainWindowPos", getWindowStateAsString());
    clearContentComponent();

  #if ! (JUCE_ANDROID || JUCE_IOS)
   #if JUCE_MAC
    setMacMainMenu (nullptr);
   #else
    setMenuBar (nullptr);
   #endif
  #endif

    graphHolder = nullptr;
}

void MainHostWindow::closeButtonPressed()
{
    tryToQuitApplication();
}

struct AsyncQuitRetrier  : private Timer
{
    AsyncQuitRetrier()   { startTimer (500); }

    void timerCallback() override
    {
        stopTimer();
        delete this;

        if (auto app = JUCEApplicationBase::getInstance())
            app->systemRequestedQuit();
    }
};

void MainHostWindow::tryToQuitApplication()
{
    if (graphHolder->closeAnyOpenPluginWindows())
    {
        // Really important thing to note here: if the last call just deleted any plugin windows,
        // we won't exit immediately - instead we'll use our AsyncQuitRetrier to let the message
        // loop run for another brief moment, then try again. This will give any plugins a chance
        // to flush any GUI events that may have been in transit before the app forces them to
        // be unloaded
        new AsyncQuitRetrier();
        return;
    }

    if (ModalComponentManager::getInstance()->cancelAllModalComponents())
    {
        new AsyncQuitRetrier();
        return;
    }

    if (graphHolder != nullptr)
    {
        auto releaseAndQuit = [this]
        {
            // Some plug-ins do not want [NSApp stop] to be called
            // before the plug-ins are not deallocated.
            graphHolder->releaseGraph();

            JUCEApplication::quit();
        };

       #if JUCE_ANDROID || JUCE_IOS
        if (graphHolder->graph->saveDocument (PluginGraph::getDefaultGraphDocumentOnMobile()))
            releaseAndQuit();
       #else
        SafePointer<MainHostWindow> parent { this };
        graphHolder->graph->saveIfNeededAndUserAgreesAsync ([parent, releaseAndQuit] (FileBasedDocument::SaveResult r)
        {
            if (parent == nullptr)
                return;

            if (r == FileBasedDocument::savedOk)
                releaseAndQuit();
        });
       #endif

        return;
    }

    JUCEApplication::quit();
}

void MainHostWindow::changeListenerCallback (ChangeBroadcaster* changed)
{
    if (changed == &knownPluginList)
    {
        menuItemsChanged();

        // save the plugin list every time it gets changed, so that if we're scanning
        // and it crashes, we've still saved the previous ones
        if (auto savedPluginList = std::unique_ptr<XmlElement> (knownPluginList.createXml()))
        {
            getAppProperties().getUserSettings()->setValue ("pluginList", savedPluginList.get());
            getAppProperties().saveIfNeeded();
        }
    }
    else if (graphHolder != nullptr && changed == graphHolder->graph.get())
    {
        auto title = JUCEApplication::getInstance()->getApplicationName();
        auto f = graphHolder->graph->getFile();

        if (f.existsAsFile())
            title = f.getFileName() + " - " + title;

        setName (title);
    }
}

StringArray MainHostWindow::getMenuBarNames()
{
    StringArray names;
    names.add ("File");
    names.add ("Plugins");
    names.add ("Options");
    names.add ("Windows");
    return names;
}

PopupMenu MainHostWindow::getMenuForIndex (int topLevelMenuIndex, const String& /*menuName*/)
{
    PopupMenu menu;

    if (topLevelMenuIndex == 0)
    {
        // "File" menu
       #if ! (JUCE_IOS || JUCE_ANDROID)
        menu.addCommandItem (&getCommandManager(), CommandIDs::newFile);
        menu.addCommandItem (&getCommandManager(), CommandIDs::open);
       #endif

        RecentlyOpenedFilesList recentFiles;
        recentFiles.restoreFromString (getAppProperties().getUserSettings()
                                            ->getValue ("recentFilterGraphFiles"));

        PopupMenu recentFilesMenu;
        recentFiles.createPopupMenuItems (recentFilesMenu, 100, true, true);
        menu.addSubMenu ("Open recent file", recentFilesMenu);

       #if ! (JUCE_IOS || JUCE_ANDROID)
        menu.addCommandItem (&getCommandManager(), CommandIDs::save);
        menu.addCommandItem (&getCommandManager(), CommandIDs::saveAs);
       #endif

        menu.addSeparator();
        menu.addCommandItem (&getCommandManager(), StandardApplicationCommandIDs::quit);
    }
    else if (topLevelMenuIndex == 1)
    {
        // "Plugins" menu
        PopupMenu pluginsMenu;
        addPluginsToMenu (pluginsMenu);
        menu.addSubMenu ("Create Plug-in", pluginsMenu);
        menu.addSeparator();
        menu.addItem (250, "Delete All Plug-ins");
    }
    else if (topLevelMenuIndex == 2)
    {
        // "Options" menu

        menu.addCommandItem (&getCommandManager(), CommandIDs::showPluginListEditor);

        PopupMenu sortTypeMenu;
        sortTypeMenu.addItem (200, "List Plug-ins in Default Order",      true, pluginSortMethod == KnownPluginList::defaultOrder);
        sortTypeMenu.addItem (201, "List Plug-ins in Alphabetical Order", true, pluginSortMethod == KnownPluginList::sortAlphabetically);
        sortTypeMenu.addItem (202, "List Plug-ins by Category",           true, pluginSortMethod == KnownPluginList::sortByCategory);
        sortTypeMenu.addItem (203, "List Plug-ins by Manufacturer",       true, pluginSortMethod == KnownPluginList::sortByManufacturer);
        sortTypeMenu.addItem (204, "List Plug-ins Based on the Directory Structure", true, pluginSortMethod == KnownPluginList::sortByFileSystemLocation);
        menu.addSubMenu ("Plug-in Menu Type", sortTypeMenu);

        menu.addSeparator();
        menu.addCommandItem (&getCommandManager(), CommandIDs::showAudioSettings);
        menu.addCommandItem (&getCommandManager(), CommandIDs::toggleDoublePrecision);

        if (autoScaleOptionAvailable)
            menu.addCommandItem (&getCommandManager(), CommandIDs::autoScalePluginWindows);

        menu.addSeparator();
        menu.addCommandItem (&getCommandManager(), CommandIDs::aboutBox);
    }
    else if (topLevelMenuIndex == 3)
    {
        menu.addCommandItem (&getCommandManager(), CommandIDs::allWindowsForward);
    }

    return menu;
}

void MainHostWindow::menuItemSelected (int menuItemID, int /*topLevelMenuIndex*/)
{
    if (menuItemID == 250)
    {
        if (graphHolder != nullptr)
            if (auto* graph = graphHolder->graph.get())
                graph->clear();
    }
   #if ! (JUCE_ANDROID || JUCE_IOS)
    else if (menuItemID >= 100 && menuItemID < 200)
    {
        RecentlyOpenedFilesList recentFiles;
        recentFiles.restoreFromString (getAppProperties().getUserSettings()
                                            ->getValue ("recentFilterGraphFiles"));

        if (graphHolder != nullptr)
        {
            if (auto* graph = graphHolder->graph.get())
            {
                SafePointer<MainHostWindow> parent { this };
                graph->saveIfNeededAndUserAgreesAsync ([parent, recentFiles, menuItemID] (FileBasedDocument::SaveResult r)
                {
                    if (parent == nullptr)
                        return;

                    if (r == FileBasedDocument::savedOk)
                        parent->graphHolder->graph->loadFrom (recentFiles.getFile (menuItemID - 100), true);
                });
            }
        }
    }
   #endif
    else if (menuItemID >= 200 && menuItemID < 210)
    {
             if (menuItemID == 200)     pluginSortMethod = KnownPluginList::defaultOrder;
        else if (menuItemID == 201)     pluginSortMethod = KnownPluginList::sortAlphabetically;
        else if (menuItemID == 202)     pluginSortMethod = KnownPluginList::sortByCategory;
        else if (menuItemID == 203)     pluginSortMethod = KnownPluginList::sortByManufacturer;
        else if (menuItemID == 204)     pluginSortMethod = KnownPluginList::sortByFileSystemLocation;

        getAppProperties().getUserSettings()->setValue ("pluginSortMethod", (int) pluginSortMethod);

        menuItemsChanged();
    }
    else
    {
        if (KnownPluginList::getIndexChosenByMenu (pluginDescriptions, menuItemID) >= 0)
            createPlugin (getChosenType (menuItemID), { proportionOfWidth  (0.3f + Random::getSystemRandom().nextFloat() * 0.6f),
                                                        proportionOfHeight (0.3f + Random::getSystemRandom().nextFloat() * 0.6f) });
    }
}

void MainHostWindow::menuBarActivated (bool isActivated)
{
    if (isActivated && graphHolder != nullptr)
        graphHolder->unfocusKeyboardComponent();
}

void MainHostWindow::createPlugin (const PluginDescription& desc, Point<int> pos)
{
    if (graphHolder != nullptr)
        graphHolder->createNewPlugin (desc, pos);
}

void MainHostWindow::addPluginsToMenu (PopupMenu& m)
{
    if (graphHolder != nullptr)
    {
        int i = 0;

        for (auto& t : internalTypes)
            m.addItem (++i, t.name + " (" + t.pluginFormatName + ")");
    }

    m.addSeparator();

    pluginDescriptions = knownPluginList.getTypes();

    // This avoids showing the internal types again later on in the list
    pluginDescriptions.removeIf ([] (PluginDescription& desc)
    {
        return desc.pluginFormatName == InternalPluginFormat::getIdentifier();
    });

    KnownPluginList::addToMenu (m, pluginDescriptions, pluginSortMethod);
}

PluginDescription MainHostWindow::getChosenType (const int menuID) const
{
    if (menuID >= 1 && menuID < (int) (1 + internalTypes.size()))
        return internalTypes[(size_t) (menuID - 1)];

    return pluginDescriptions[KnownPluginList::getIndexChosenByMenu (pluginDescriptions, menuID)];
}

//==============================================================================
ApplicationCommandTarget* MainHostWindow::getNextCommandTarget()
{
    return findFirstTargetParentComponent();
}

void MainHostWindow::getAllCommands (Array<CommandID>& commands)
{
    // this returns the set of all commands that this target can perform..
    const CommandID ids[] = {
                             #if ! (JUCE_IOS || JUCE_ANDROID)
                              CommandIDs::newFile,
                              CommandIDs::open,
                              CommandIDs::save,
                              CommandIDs::saveAs,
                             #endif
                              CommandIDs::showPluginListEditor,
                              CommandIDs::showAudioSettings,
                              CommandIDs::toggleDoublePrecision,
                              CommandIDs::aboutBox,
                              CommandIDs::allWindowsForward,
                              CommandIDs::autoScalePluginWindows
                            };

    commands.addArray (ids, numElementsInArray (ids));
}

void MainHostWindow::getCommandInfo (const CommandID commandID, ApplicationCommandInfo& result)
{
    const String category ("General");

    switch (commandID)
    {
   #if ! (JUCE_IOS || JUCE_ANDROID)
    case CommandIDs::newFile:
        result.setInfo ("New", "Creates a new filter graph file", category, 0);
        result.defaultKeypresses.add(KeyPress('n', ModifierKeys::commandModifier, 0));
        break;

    case CommandIDs::open:
        result.setInfo ("Open...", "Opens a filter graph file", category, 0);
        result.defaultKeypresses.add (KeyPress ('o', ModifierKeys::commandModifier, 0));
        break;

    case CommandIDs::save:
        result.setInfo ("Save", "Saves the current graph to a file", category, 0);
        result.defaultKeypresses.add (KeyPress ('s', ModifierKeys::commandModifier, 0));
        break;

    case CommandIDs::saveAs:
        result.setInfo ("Save As...",
                        "Saves a copy of the current graph to a file",
                        category, 0);
        result.defaultKeypresses.add (KeyPress ('s', ModifierKeys::shiftModifier | ModifierKeys::commandModifier, 0));
        break;
   #endif

    case CommandIDs::showPluginListEditor:
        result.setInfo ("Edit the List of Available Plug-ins...", {}, category, 0);
        result.addDefaultKeypress ('p', ModifierKeys::commandModifier);
        break;

    case CommandIDs::showAudioSettings:
        result.setInfo ("Change the Audio Device Settings", {}, category, 0);
        result.addDefaultKeypress ('a', ModifierKeys::commandModifier);
        break;

    case CommandIDs::toggleDoublePrecision:
        updatePrecisionMenuItem (result);
        break;

    case CommandIDs::aboutBox:
        result.setInfo ("About...", {}, category, 0);
        break;

    case CommandIDs::allWindowsForward:
        result.setInfo ("All Windows Forward", "Bring all plug-in windows forward", category, 0);
        result.addDefaultKeypress ('w', ModifierKeys::commandModifier);
        break;

    case CommandIDs::autoScalePluginWindows:
        updateAutoScaleMenuItem (result);
        break;

    default:
        break;
    }
}

bool MainHostWindow::perform (const InvocationInfo& info)
{
    switch (info.commandID)
    {
   #if ! (JUCE_IOS || JUCE_ANDROID)
    case CommandIDs::newFile:
        if (graphHolder != nullptr && graphHolder->graph != nullptr)
        {
            SafePointer<MainHostWindow> parent { this };
            graphHolder->graph->saveIfNeededAndUserAgreesAsync ([parent] (FileBasedDocument::SaveResult r)
            {
                if (parent == nullptr)
                    return;

                if (r == FileBasedDocument::savedOk)
                    parent->graphHolder->graph->newDocument();
            });
        }
        break;

    case CommandIDs::open:
         if (graphHolder != nullptr && graphHolder->graph != nullptr)
         {
             SafePointer<MainHostWindow> parent { this };
             graphHolder->graph->saveIfNeededAndUserAgreesAsync ([parent] (FileBasedDocument::SaveResult r)
             {
                 if (parent == nullptr)
                     return;

                 if (r == FileBasedDocument::savedOk)
                     parent->graphHolder->graph->loadFromUserSpecifiedFileAsync (true, [] (Result) {});
             });
         }
        break;

    case CommandIDs::save:
        if (graphHolder != nullptr && graphHolder->graph != nullptr)
            graphHolder->graph->saveAsync (true, true, nullptr);
        break;

    case CommandIDs::saveAs:
        if (graphHolder != nullptr && graphHolder->graph != nullptr)
            graphHolder->graph->saveAsAsync ({}, true, true, true, nullptr);
        break;
   #endif

    case CommandIDs::showPluginListEditor:
        if (pluginListWindow == nullptr)
            pluginListWindow.reset (new PluginListWindow (*this, formatManager));

        pluginListWindow->toFront (true);
        break;

    case CommandIDs::showAudioSettings:
        showAudioSettings();
        break;

    case CommandIDs::toggleDoublePrecision:
        if (auto* props = getAppProperties().getUserSettings())
        {
            auto newIsDoublePrecision = ! isDoublePrecisionProcessingEnabled();
            props->setValue ("doublePrecisionProcessing", var (newIsDoublePrecision));

            ApplicationCommandInfo cmdInfo (info.commandID);
            updatePrecisionMenuItem (cmdInfo);
            menuItemsChanged();

            if (graphHolder != nullptr)
                graphHolder->setDoublePrecision (newIsDoublePrecision);
        }
        break;

    case CommandIDs::autoScalePluginWindows:
        if (auto* props = getAppProperties().getUserSettings())
        {
            auto newAutoScale = ! isAutoScalePluginWindowsEnabled();
            props->setValue ("autoScalePluginWindows", var (newAutoScale));

            ApplicationCommandInfo cmdInfo (info.commandID);
            updateAutoScaleMenuItem (cmdInfo);
            menuItemsChanged();
        }
        break;

    case CommandIDs::aboutBox:
        // TODO
        break;

    case CommandIDs::allWindowsForward:
    {
        auto& desktop = Desktop::getInstance();

        for (int i = 0; i < desktop.getNumComponents(); ++i)
            desktop.getComponent (i)->toBehind (this);

        break;
    }

    default:
        return false;
    }

    return true;
}

void MainHostWindow::showAudioSettings()
{
    auto* audioSettingsComp = new AudioDeviceSelectorComponent (deviceManager,
                                                                0, 256,
                                                                0, 256,
                                                                true, true,
                                                                true, false);

    audioSettingsComp->setSize (500, 450);

    DialogWindow::LaunchOptions o;
    o.content.setOwned (audioSettingsComp);
    o.dialogTitle                   = "Audio Settings";
    o.componentToCentreAround       = this;
    o.dialogBackgroundColour        = getLookAndFeel().findColour (ResizableWindow::backgroundColourId);
    o.escapeKeyTriggersCloseButton  = true;
    o.useNativeTitleBar             = false;
    o.resizable                     = false;

     auto* w = o.create();
     auto safeThis = SafePointer<MainHostWindow> (this);

     w->enterModalState (true,
                         ModalCallbackFunction::create
                         ([safeThis] (int)
                         {
                             auto audioState = safeThis->deviceManager.createStateXml();

                             getAppProperties().getUserSettings()->setValue ("audioDeviceState", audioState.get());
                             getAppProperties().getUserSettings()->saveIfNeeded();

                             if (safeThis->graphHolder != nullptr)
                                 if (safeThis->graphHolder->graph != nullptr)
                                     safeThis->graphHolder->graph->graph.removeIllegalConnections();
                         }), true);
}

bool MainHostWindow::isInterestedInFileDrag (const StringArray&)
{
    return true;
}

void MainHostWindow::fileDragEnter (const StringArray&, int, int)
{
}

void MainHostWindow::fileDragMove (const StringArray&, int, int)
{
}

void MainHostWindow::fileDragExit (const StringArray&)
{
}

void MainHostWindow::filesDropped (const StringArray& files, int x, int y)
{
    if (graphHolder != nullptr)
    {
       #if ! (JUCE_ANDROID || JUCE_IOS)
        File firstFile { files[0] };

        if (files.size() == 1 && firstFile.hasFileExtension (PluginGraph::getFilenameSuffix()))
        {
            if (auto* g = graphHolder->graph.get())
            {
                SafePointer<MainHostWindow> parent;
                g->saveIfNeededAndUserAgreesAsync ([parent, g, firstFile] (FileBasedDocument::SaveResult r)
                {
                    if (parent == nullptr)
                        return;

                    if (r == FileBasedDocument::savedOk)
                        g->loadFrom (firstFile, true);
                });
            }
        }
        else
       #endif
        {
            OwnedArray<PluginDescription> typesFound;
            knownPluginList.scanAndAddDragAndDroppedFiles (formatManager, files, typesFound);

            auto pos = graphHolder->getLocalPoint (this, Point<int> (x, y));

            for (int i = 0; i < jmin (5, typesFound.size()); ++i)
                if (auto* desc = typesFound.getUnchecked(i))
                    createPlugin (*desc, pos);
        }
    }
}

bool MainHostWindow::isDoublePrecisionProcessingEnabled()
{
    if (auto* props = getAppProperties().getUserSettings())
        return props->getBoolValue ("doublePrecisionProcessing", false);

    return false;
}

bool MainHostWindow::isAutoScalePluginWindowsEnabled()
{
    if (auto* props = getAppProperties().getUserSettings())
        return props->getBoolValue ("autoScalePluginWindows", false);

    return false;
}

void MainHostWindow::updatePrecisionMenuItem (ApplicationCommandInfo& info)
{
    info.setInfo ("Double Floating-Point Precision Rendering", {}, "General", 0);
    info.setTicked (isDoublePrecisionProcessingEnabled());
}

void MainHostWindow::updateAutoScaleMenuItem (ApplicationCommandInfo& info)
{
    info.setInfo ("Auto-Scale Plug-in Windows", {}, "General", 0);
    info.setTicked (isAutoScalePluginWindowsEnabled());
}