Add cairo interface.

src/ui_elements/desktop_elements/Screen.cpp

@@ -1,5 +1,7 @@
 #include "Screen.h"
 
+#include "IPlatformScreen.h"
+
 namespace mt{
 Screen::Screen()
 {
@@ -11,8 +13,22 @@ Screen::~Screen()
 
 }
 
-std::shared_ptr<Screen> Screen::Create()
+std::unique_ptr<Screen> Screen::Create()
 {
-	return std::make_shared<Screen>();
+	return std::make_unique<Screen>();
+}
+
+IPlatformScreen* Screen::GetPlatformScreen() const
+{
+    if (mPlatformScreen)
+    {
+        return mPlatformScreen.get();
+    }
+    return nullptr;
+}
+
+void Screen::SetPlatformScreen(IPlatformScreenPtr screen)
+{
+    mPlatformScreen = std::move(screen);
 }
 }