react-native-camera_edit/windows/ReactNativeCameraCPP/ReactCameraViewManager.cpp

#include "pch.h"
#include "ReactCameraViewManager.h"
#include "ReactCameraConstants.h"

#include <iomanip>

namespace winrt {
    using namespace Windows::UI::Xaml;
    using namespace Windows::UI::Xaml::Media;
    using namespace Windows::UI::Xaml::Controls;
    using namespace Windows::Devices::Enumeration;
    using namespace Windows::Foundation;
    using namespace Windows::Foundation::Collections;
    using namespace Windows::Media::MediaProperties;
    using namespace Windows::Storage;
    using namespace Windows::Storage::Streams;
    using namespace Microsoft::ReactNative;
} //namespace winrt


namespace winrt::ReactNativeCameraCPP::implementation {
    // static vector to contain all currently active camera view instances
    // This is a temporary workaround to map the view tag to view instance, since
    // Method call from ReactCameraModule constains view tag as parameter and we need
    // to forward the call to CameraView instance.
    std::vector<winrt::com_ptr<ReactNativeCameraCPP::ReactCameraView>> ReactCameraViewManager::m_cameraViewInstances;

    ReactCameraViewManager::ReactCameraViewManager() {}

    // IViewManager
    hstring ReactCameraViewManager::Name() noexcept {
        return L"RNCamera";
    }

    FrameworkElement ReactCameraViewManager::CreateView() noexcept {
        auto const& view = ReactNativeCameraCPP::ReactCameraView::Create();
        view->SetContext(m_reactContext);
        m_cameraViewInstances.emplace_back(view);

        return view.as<winrt::Grid>();
    }

    // IViewManagerWithReactContext
    IReactContext ReactCameraViewManager::ReactContext() noexcept {
        return m_reactContext;
    }

    void ReactCameraViewManager::ReactContext(IReactContext reactContext) noexcept {
        m_reactContext = reactContext;
    }

    // IViewManagerWithNativeProperties
    IMapView<hstring, ViewManagerPropertyType> ReactCameraViewManager::NativeProps() noexcept {
        auto nativeProps = winrt::single_threaded_map<hstring, ViewManagerPropertyType>();

        nativeProps.Insert(L"aspect", ViewManagerPropertyType::Number);
        nativeProps.Insert(L"type", ViewManagerPropertyType::Number);
        nativeProps.Insert(L"autoFocus", ViewManagerPropertyType::Boolean);
        nativeProps.Insert(L"whiteBalance", ViewManagerPropertyType::Number);
        nativeProps.Insert(L"torchMode", ViewManagerPropertyType::Number);
        nativeProps.Insert(L"flashMode", ViewManagerPropertyType::Number);
        //        nativeProps.Insert(L"barcodeScannerEnabled", ViewManagerPropertyType::Boolean);
        //        nativeProps.Insert(L"barCodeTypes", ViewManagerPropertyType::Array);
        nativeProps.Insert(L"keepAwake", ViewManagerPropertyType::Boolean);

        return nativeProps.GetView();
    }

    void ReactCameraViewManager::UpdateProperties(
        FrameworkElement const& view,
        IJSValueReader const& propertyMapReader) noexcept {
        if (auto reactCameraView = view.try_as<ReactNativeCameraCPP::ReactCameraView>()) {
            reactCameraView->UpdateProperties(propertyMapReader);
        }
    }

    void ReactCameraViewManager::RemoveViewFromList(winrt::com_ptr<ReactNativeCameraCPP::ReactCameraView> view)
    {
        auto it = std::find(m_cameraViewInstances.begin(), m_cameraViewInstances.end(), view);
        if (it != m_cameraViewInstances.end())
            m_cameraViewInstances.erase(it);
    }

    IAsyncAction ReactCameraViewManager::TakePictureAsync(
        std::map<std::wstring, winrt::Microsoft::ReactNative::JSValue> const& options,
        int viewTag,
        ReactPromise<JSValueObject>& result)
    {
        auto index = co_await FindCamera(viewTag);
        if (index != -1)
        {
            auto cameraView = m_cameraViewInstances.at(index);
            co_await cameraView->TakePictureAsync(options, result);
        }
        else
        {
            result.Reject("No camera instance found.");
        }
    }

    IAsyncAction ReactCameraViewManager::RecordAsync(
        std::map<std::wstring, JSValue> const& options,
        int viewTag,
        ReactPromise<JSValueObject>& result)
    {
        auto index = co_await FindCamera(viewTag);
        if (index != -1)
        {
            auto cameraView = m_cameraViewInstances.at(index);
            co_await cameraView->RecordAsync(options, result);
        }
        else
        {
            result.Reject("No camera instance found.");
        }
    }
    
    // Intialize MediaCapture and will bring up the constent dialog if this
    // is the first time. RNC will display a progress indicator while waiting
    // for user click. This method will resolve as no permission if user does
    // not grant the permission or App does not have the appx capabilities for
    // Microphone and WebCam specified in its Package.Appxmanifest.
    IAsyncAction ReactCameraViewManager::CheckMediaCapturePermissionAsync(
        winrt::Microsoft::ReactNative::ReactPromise<bool>& result)
    {
        auto mediaCapture = winrt::Windows::Media::Capture::MediaCapture();
        bool hasPermission = true;
        try {
            co_await mediaCapture.InitializeAsync();
        }
        catch (winrt::hresult_error const&) {
            hasPermission = false;
        }
        result.Resolve(hasPermission);
    }

    IAsyncOperation<int> ReactCameraViewManager::FindCamera(int viewTag)
    {
        int index = 0;
        for (const auto& cameraView : m_cameraViewInstances)
        {
            auto element = cameraView.as<winrt::Grid>();
            auto dispatcher = element.Dispatcher();
            co_await resume_foreground(dispatcher);
            int currentTag = static_cast<int>(element.GetValue(winrt::FrameworkElement::TagProperty()).as<winrt::IPropertyValue>().GetInt64());
            if (currentTag == viewTag)
            {
                co_return index;
            }
            co_await resume_background();
            index++;
        }
        co_return -1;
    }

} // namespace winrt::ReactNativeCameraCPP::implementation