DeviceLostHelper.h

//*********************************************************
//
// Copyright (c) Microsoft. All rights reserved.
// This code is licensed under the MIT License (MIT).
// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH 
// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//*********************************************************

#pragma once

using namespace Windows::Graphics::DirectX::Direct3D11;

namespace SamplesNative
{
    ref class DeviceLostHelper;

    public ref class DeviceLostEventArgs sealed
    {
    public:
        property IDirect3DDevice^ Device
        {
            IDirect3DDevice^ get() { return m_device; }
        }

    internal:
        static DeviceLostEventArgs^ Create(IDirect3DDevice^ device) { return ref new DeviceLostEventArgs(device); }
    private:
        DeviceLostEventArgs(IDirect3DDevice^ device) : m_device(device) {}

        IDirect3DDevice^ m_device;
    };

    public delegate void DeviceLostEventHandler(DeviceLostHelper^ sender, DeviceLostEventArgs^ args);

    public ref class DeviceLostHelper sealed
    {
    public:
        property IDirect3DDevice^ CurrentlyWatchedDevice
        {
            IDirect3DDevice^ get() { return m_device; }
        }

        DeviceLostHelper();

        void WatchDevice(IDirect3DDevice^ device);
        void StopWatchingCurrentDevice();

        event DeviceLostEventHandler^ DeviceLost;
    private:
        ~DeviceLostHelper();
        void RaiseDeviceLostEvent(IDirect3DDevice^ oldDevice);

        static void CALLBACK OnDeviceLost(PTP_CALLBACK_INSTANCE instance, PVOID context, PTP_WAIT wait, TP_WAIT_RESULT waitResult);
    private:
        IDirect3DDevice^ m_device;

        PTP_WAIT OnDeviceLostHandler;
        HANDLE m_eventHandle;
        DWORD m_cookie;
    };
};