Add code to react on mouse, pen and touch input events

This commit adds the code that is necessary to react on mouse, pen and
touch events. However, it does not actually execute code when such an
event occurs. It was purely added to reproduce the issue described in
[1] which occurs as soon as the version of the Windows App SDK NuGet
packages is raised to a version > 1.1.5 and <= 1.3.230602002.

[1]: microsoft/microsoft-ui-xaml#7924

SwapChainPanelBugRepro/View/SquareView.cpp

@@ -6,6 +6,7 @@
 namespace winrt::SwapChainPanelBugRepro::implementation
 {
   using namespace winrt::Microsoft::UI::Dispatching;
+  using namespace winrt::Microsoft::UI::Input;
   using namespace winrt::Windows::Foundation;
 
 
@@ -38,6 +39,7 @@ namespace winrt::SwapChainPanelBugRepro::implementation
     CreateDeviceResources();
     CreateSizeDependentResources();
     StartRenderingLoop();
+    StartInputProcessingLoop();
     co_return;
   }
 
@@ -46,6 +48,7 @@ namespace winrt::SwapChainPanelBugRepro::implementation
   {
     _isRenderLoopRunning = false;
     co_await _renderLoopController.ShutdownQueueAsync();
+    co_await _inputProcessingLoopController.ShutdownQueueAsync();
     co_return;
   }
 
@@ -67,9 +70,31 @@ namespace winrt::SwapChainPanelBugRepro::implementation
   }
 
 
+  void SquareView::StartInputProcessingLoop()
+  {
+    if(!_inputProcessingLoopController)
+    {
+      _inputProcessingLoopController = DispatcherQueueController::CreateOnDedicatedThread();
+      _inputProcessingLoopController.DispatcherQueue().TryEnqueue([this]()
+      {
+        InputPointerSource inputPointerSource = CreateCoreIndependentInputSource(_pointerSourceDevices);
+        inputPointerSource.PointerPressed({ this, &SquareView::OnPointerPressed });
+      });
+    }
+  }
+
+
   void SquareView::Render()
   {
     _renderer->RenderFrame();
     Present();
   }
+
+
+  void SquareView::OnPointerPressed(IInspectable const&, PointerEventArgs)
+  {
+    // Normally, in here we would process mouse, pen, etc. input and execute code accordingly.
+    // However, the mere presence of the input processing loop leads to an exception when
+    // cleaning up the SwapChainPanel.
+  }
 }

SwapChainPanelBugRepro/View/SquareView.h

@@ -13,6 +13,12 @@ namespace winrt::SwapChainPanelBugRepro::implementation
     std::unique_ptr<::SwapChainPanelBugRepro::SquareRenderer> _renderer;
 
     winrt::Microsoft::UI::Dispatching::DispatcherQueueController _renderLoopController{ nullptr };
+    winrt::Microsoft::UI::Dispatching::DispatcherQueueController _inputProcessingLoopController{ nullptr };
+
+    static constexpr auto _pointerSourceDevices =
+      winrt::Microsoft::UI::Input::InputPointerSourceDeviceKinds::Mouse |
+      winrt::Microsoft::UI::Input::InputPointerSourceDeviceKinds::Touch |
+      winrt::Microsoft::UI::Input::InputPointerSourceDeviceKinds::Pen;
 
     bool _isRenderLoopRunning = false;
 
@@ -23,7 +29,10 @@ namespace winrt::SwapChainPanelBugRepro::implementation
     winrt::Windows::Foundation::IAsyncAction BeforeUnloaded() override;
 
     void StartRenderingLoop();
+    void StartInputProcessingLoop();
     void Render();
+
+    void OnPointerPressed(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Input::PointerEventArgs e);
   };
 }
 

SwapChainPanelBugRepro/View/TriangleView.cpp

@@ -6,6 +6,7 @@
 namespace winrt::SwapChainPanelBugRepro::implementation
 {
   using namespace winrt::Microsoft::UI::Dispatching;
+  using namespace winrt::Microsoft::UI::Input;
   using namespace winrt::Windows::Foundation;
 
 
@@ -38,6 +39,7 @@ namespace winrt::SwapChainPanelBugRepro::implementation
     CreateDeviceResources();
     CreateSizeDependentResources();
     StartRenderingLoop();
+    StartInputProcessingLoop();
     co_return;
   }
 
@@ -46,6 +48,7 @@ namespace winrt::SwapChainPanelBugRepro::implementation
   {
     _isRenderLoopRunning = false;
     co_await _renderLoopController.ShutdownQueueAsync();
+    co_await _inputProcessingLoopController.ShutdownQueueAsync();
     co_return;
   }
 
@@ -67,9 +70,31 @@ namespace winrt::SwapChainPanelBugRepro::implementation
   }
 
 
+  void TriangleView::StartInputProcessingLoop()
+  {
+    if(!_inputProcessingLoopController)
+    {
+      _inputProcessingLoopController = DispatcherQueueController::CreateOnDedicatedThread();
+      _inputProcessingLoopController.DispatcherQueue().TryEnqueue([this]()
+      {
+        InputPointerSource inputPointerSource = CreateCoreIndependentInputSource(_pointerSourceDevices);
+        inputPointerSource.PointerPressed({ this, &TriangleView::OnPointerPressed });
+      });
+    }
+  }
+
+
   void TriangleView::Render()
   {
     _renderer->RenderFrame();
     Present();
   }
+
+
+  void TriangleView::OnPointerPressed(IInspectable const&, PointerEventArgs)
+  {
+    // Normally, in here we would process mouse, pen, etc. input and execute code accordingly.
+    // However, the mere presence of the input processing loop leads to an exception when
+    // cleaning up the SwapChainPanel.
+  }
 }

SwapChainPanelBugRepro/View/TriangleView.h

@@ -13,6 +13,12 @@ namespace winrt::SwapChainPanelBugRepro::implementation
     std::unique_ptr<::SwapChainPanelBugRepro::TriangleRenderer> _renderer;
 
     winrt::Microsoft::UI::Dispatching::DispatcherQueueController _renderLoopController{ nullptr };
+    winrt::Microsoft::UI::Dispatching::DispatcherQueueController _inputProcessingLoopController{ nullptr };
+
+    static constexpr auto _pointerSourceDevices =
+      winrt::Microsoft::UI::Input::InputPointerSourceDeviceKinds::Mouse |
+      winrt::Microsoft::UI::Input::InputPointerSourceDeviceKinds::Touch |
+      winrt::Microsoft::UI::Input::InputPointerSourceDeviceKinds::Pen;
 
     bool _isRenderLoopRunning = false;
 
@@ -23,7 +29,10 @@ namespace winrt::SwapChainPanelBugRepro::implementation
     winrt::Windows::Foundation::IAsyncAction BeforeUnloaded() override;
 
     void StartRenderingLoop();
+    void StartInputProcessingLoop();
     void Render();
+
+    void OnPointerPressed(winrt::Windows::Foundation::IInspectable const& sender, winrt::Microsoft::UI::Input::PointerEventArgs e);
   };
 }
 

SwapChainPanelBugRepro/pch.h

@@ -15,6 +15,7 @@
 
 #include <microsoft.ui.xaml.media.dxinterop.h>
 #include <winrt/Microsoft.UI.Dispatching.h>
+#include <winrt/Microsoft.UI.Input.h>
 #include <winrt/Microsoft.UI.Xaml.Controls.Primitives.h>
 #include <winrt/Microsoft.UI.Xaml.Markup.h>
 #include <winrt/Microsoft.UI.Xaml.Media.h>