Add Platform::GetMousePosition/WindowsPlatform::SetMousePosition for unified access to screen-space mouse position on all platforms

#1109

Source/Engine/Platform/Base/PlatformBase.cpp

@@ -5,6 +5,7 @@
 #include "Engine/Platform/MemoryStats.h"
 #include "Engine/Platform/MessageBox.h"
 #include "Engine/Platform/FileSystem.h"
+#include "Engine/Platform/Window.h"
 #include "Engine/Platform/User.h"
 #include "Engine/Core/Log.h"
 #include "Engine/Core/Types/DateTime.h"
@@ -520,6 +521,21 @@ void PlatformBase::CreateGuid(Guid& result)
     result = Guid(dateThingHigh, randomThing | (sequentialThing << 16), cyclesThing, dateThingLow);
 }
 
+Float2 PlatformBase::GetMousePosition()
+{
+    const Window* win = Engine::MainWindow;
+    if (win)
+        return win->ClientToScreen(win->GetMousePosition());
+    return Float2::Minimum;
+}
+
+void PlatformBase::SetMousePosition(const Float2& position)
+{
+    const Window* win = Engine::MainWindow;
+    if (win)
+        win->SetMousePosition(win->ScreenToClient(position));
+}
+
 Float2 PlatformBase::GetVirtualDesktopSize()
 {
     return Platform::GetVirtualDesktopBounds().Size;

Source/Engine/Platform/Base/PlatformBase.h

@@ -660,6 +660,18 @@ public:
 
 public:
 
+    /// <summary>
+    /// Gets the mouse cursor position in screen-space coordinates.
+    /// </summary>
+    /// <returns>Mouse cursor coordinates.</returns>
+    API_PROPERTY() static Float2 GetMousePosition();
+
+    /// <summary>
+    /// Sets the mouse cursor position in screen-space coordinates.
+    /// </summary>
+    /// <param name="position">Cursor position to set.</param>
+    API_PROPERTY() static void SetMousePosition(const Float2& position);
+
     /// <summary>
     /// Gets the origin position and size of the monitor at the given screen-space location.
     /// </summary>