Keyboard and Mouse IsConnected method

microsoft · Nov 18, 2016 · a600872 · a600872
1 parent dce4703
commit a600872
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Showing 4 changed files with 80 additions and 1 deletion.
diff --git a/Inc/Keyboard.h b/Inc/Keyboard.h
@@ -452,6 +452,9 @@ namespace DirectX
         // Reset the keyboard state
         void __cdecl Reset();
 
+        // Feature detection
+        bool __cdecl IsConnected() const;
+
 #if !defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP) && defined(WM_USER)
         static void __cdecl ProcessMessage(UINT message, WPARAM wParam, LPARAM lParam);
 #endif

diff --git a/Inc/Mouse.h b/Inc/Mouse.h
@@ -90,7 +90,10 @@ namespace DirectX
 
         // Sets mouse mode (defaults to absolute)
         void __cdecl SetMode(Mode mode);
-
+
+        // Feature detection
+        bool __cdecl IsConnected() const;
+
 #if !defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP) && defined(WM_USER)
         void __cdecl SetWindow(HWND window);
         static void __cdecl ProcessMessage(UINT message, WPARAM wParam, LPARAM lParam);

diff --git a/Src/Keyboard.cpp b/Src/Keyboard.cpp
@@ -62,6 +62,8 @@ namespace
 // }
 //
 
+#include <Windows.Devices.Input.h>
+
 class Keyboard::Impl
 {
 public:
@@ -98,6 +100,26 @@ class Keyboard::Impl
         memset( &mState, 0, sizeof(State) );
     }
 
+    bool IsConnected() const
+    {
+        using namespace Microsoft::WRL;
+        using namespace Microsoft::WRL::Wrappers;
+        using namespace ABI::Windows::Devices::Input;
+        using namespace ABI::Windows::Foundation;
+
+        ComPtr<IKeyboardCapabilities> caps;
+        HRESULT hr = RoActivateInstance(HStringReference(RuntimeClass_Windows_Devices_Input_KeyboardCapabilities).Get(), &caps);
+        ThrowIfFailed(hr);
+
+        INT32 value;
+        if (SUCCEEDED(caps->get_KeyboardPresent(&value)))
+        {
+            return value != 0;
+        }
+
+        return false;
+    }
+
     void SetWindow(ABI::Windows::UI::Core::ICoreWindow* window)
     {
         using namespace Microsoft::WRL;
@@ -294,6 +316,11 @@ class Keyboard::Impl
     {
     }
 
+    bool IsConnected() const
+    {
+        return false;
+    }
+
     Keyboard*   mOwner;
 
     static Keyboard::Impl* s_keyboard;
@@ -361,6 +388,11 @@ class Keyboard::Impl
         memset( &mState, 0, sizeof(State) );
     }
 
+    bool IsConnected() const
+    {
+        return true;
+    }
+
     State           mState;
     Keyboard*       mOwner;
 
@@ -479,6 +511,11 @@ void Keyboard::Reset()
 }
 
 
+bool Keyboard::IsConnected() const
+{
+    return pImpl->IsConnected();
+}
+
 Keyboard& Keyboard::Get()
 {
     if ( !Impl::s_keyboard || !Impl::s_keyboard->mOwner )

diff --git a/Src/Mouse.cpp b/Src/Mouse.cpp
@@ -172,6 +172,26 @@ class Mouse::Impl
         }
     }
 
+    bool IsConnected() const
+    {
+        using namespace Microsoft::WRL;
+        using namespace Microsoft::WRL::Wrappers;
+        using namespace ABI::Windows::Devices::Input;
+        using namespace ABI::Windows::Foundation;
+
+        ComPtr<IMouseCapabilities> caps;
+        HRESULT hr = RoActivateInstance(HStringReference(RuntimeClass_Windows_Devices_Input_MouseCapabilities).Get(), &caps);
+        ThrowIfFailed(hr);
+
+        INT32 value;
+        if (SUCCEEDED(caps->get_MousePresent(&value)))
+        {
+            return value != 0;
+        }
+
+        return false;
+    }
+
     void SetWindow(ABI::Windows::UI::Core::ICoreWindow* window)
     {
         using namespace Microsoft::WRL;
@@ -469,6 +489,11 @@ class Mouse::Impl
         UNREFERENCED_PARAMETER(mode);
     }
 
+    bool IsConnected() const
+    {
+        return false;
+    }
+
     Mouse*  mOwner;
 
     static Mouse::Impl* s_mouse;
@@ -609,6 +634,11 @@ class Mouse::Impl
         }
     }
 
+    bool IsConnected() const
+    {
+        return GetSystemMetrics(SM_MOUSEPRESENT) != 0;
+    }
+
     void SetWindow(HWND window)
     {
         if (mWindow == window)
@@ -926,6 +956,12 @@ void Mouse::SetMode(Mode mode)
 }
 
 
+bool Mouse::IsConnected() const
+{
+    return pImpl->IsConnected();
+}
+
+
 Mouse& Mouse::Get()
 {
     if ( !Impl::s_mouse || !Impl::s_mouse->mOwner )