JUCE/modules/juce_audio_utils/native/juce_mac_BluetoothMidiDevicePairingDialogue.mm

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

   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.

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

namespace juce
{

//==============================================================================
class API_AVAILABLE (macos (10.11)) BluetoothMidiPairingWindowClass : public ObjCClass<NSObject>
{
public:
    struct Callbacks
    {
        std::unique_ptr<ModalComponentManager::Callback> modalExit;
        std::function<void()> windowClosed;
    };

    BluetoothMidiPairingWindowClass()   : ObjCClass<NSObject> ("JUCEBluetoothMidiPairingWindowClass_")
    {
        addIvar<Callbacks*> ("callbacks");
        addIvar<CABTLEMIDIWindowController*> ("controller");

        JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
        addMethod (@selector (initWithCallbacks:),       initWithCallbacks);
        addMethod (@selector (show:),                    show);
        addMethod (@selector (receivedWindowWillClose:), receivedWindowWillClose);
        JUCE_END_IGNORE_WARNINGS_GCC_LIKE

        addMethod (@selector (dealloc), dealloc);

        registerClass();
    }

private:
    static CABTLEMIDIWindowController* getController (id self)
    {
        return getIvar<CABTLEMIDIWindowController*> (self, "controller");
    }

    static id initWithCallbacks (id self, SEL, Callbacks* cbs)
    {
        self = sendSuperclassMessage<id> (self, @selector (init));

        object_setInstanceVariable (self, "callbacks", cbs);
        object_setInstanceVariable (self, "controller", [CABTLEMIDIWindowController new]);

        JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
        [[NSNotificationCenter defaultCenter] addObserver: self
                                                 selector: @selector (receivedWindowWillClose:)
                                                     name: @"NSWindowWillCloseNotification"
                                                   object: [getController (self) window]];
        JUCE_END_IGNORE_WARNINGS_GCC_LIKE

        return self;
    }

    static void dealloc (id self, SEL)
    {
        [getController (self) release];
        sendSuperclassMessage<void> (self, @selector (dealloc));
    }

    static void show (id self, SEL, Rectangle<int>* bounds)
    {
        if (bounds != nullptr)
        {
            auto nsBounds = makeNSRect (*bounds);

            auto mainScreenHeight = []
            {
                if ([[NSScreen screens] count] == 0)
                    return (CGFloat) 0.0f;

                return [[[NSScreen screens] objectAtIndex: 0] frame].size.height;
            }();

            nsBounds.origin.y = mainScreenHeight - (nsBounds.origin.y + nsBounds.size.height);

            [getController (self).window setFrame: nsBounds
                                          display: YES];
        }

        [getController (self) showWindow: nil];
    }

    static void receivedWindowWillClose (id self, SEL, NSNotification*)
    {
        [[NSNotificationCenter defaultCenter] removeObserver: self];

        auto* cbs = getIvar<Callbacks*> (self, "callbacks");

        if (cbs->modalExit != nullptr)
            cbs->modalExit->modalStateFinished (0);

        cbs->windowClosed();
    }
};

class API_AVAILABLE (macos (10.11)) BluetoothMidiSelectorWindowHelper : public DeletedAtShutdown
{
public:
    BluetoothMidiSelectorWindowHelper (ModalComponentManager::Callback* exitCallback,
                                       Rectangle<int>* bounds)
    {
        std::unique_ptr<ModalComponentManager::Callback> exitCB (exitCallback);

        static BluetoothMidiPairingWindowClass cls;
        window.reset (cls.createInstance());

        auto deletionCB = [safeThis = WeakReference<BluetoothMidiSelectorWindowHelper> { this }]
        {
            if (safeThis != nullptr)
                delete safeThis.get();
        };

        callbacks.reset (new BluetoothMidiPairingWindowClass::Callbacks { std::move (exitCB),
                                                                          std::move (deletionCB) });

        JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wundeclared-selector")
        [window.get() performSelector: @selector (initWithCallbacks:)
                           withObject: (id) callbacks.get()];
        [window.get() performSelector: @selector (show:)
                           withObject: (id) bounds];
        JUCE_END_IGNORE_WARNINGS_GCC_LIKE
    }

private:
    std::unique_ptr<NSObject, NSObjectDeleter> window;
    std::unique_ptr<BluetoothMidiPairingWindowClass::Callbacks> callbacks;

    JUCE_DECLARE_WEAK_REFERENCEABLE (BluetoothMidiSelectorWindowHelper)
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BluetoothMidiSelectorWindowHelper)
};

//==============================================================================
bool BluetoothMidiDevicePairingDialogue::open (ModalComponentManager::Callback* exitCallback,
                                               Rectangle<int>* bounds)
{
    if (@available (macOS 10.11, *))
    {
        new BluetoothMidiSelectorWindowHelper (exitCallback, bounds);
        return true;
    }

    std::unique_ptr<ModalComponentManager::Callback> cb (exitCallback);
    // This functionality is unavailable when targetting OSX < 10.11. Instead,
    // you should pair Bluetooth MIDI devices using the "Audio MIDI Setup" app
    // (located in /Applications/Utilities).
    jassertfalse;
    return false;
}

bool BluetoothMidiDevicePairingDialogue::isAvailable()
{
    if (@available (macOS 10.11, *))
        return true;

    return false;
}

} // namespace juce