Sdl2Application: support for modifiers also in mouse events.

Lazily loaded on user request.

src/Platform/Sdl2Application.cpp

@@ -135,4 +135,16 @@ int Sdl2Application::exec() {
     return 0;
 }
 
+Sdl2Application::InputEvent::Modifiers Sdl2Application::MouseEvent::modifiers() {
+    if(modifiersLoaded) return _modifiers;
+    modifiersLoaded = true;
+    return _modifiers = static_cast<Modifier>(SDL_GetModState());
+}
+
+Sdl2Application::InputEvent::Modifiers Sdl2Application::MouseMoveEvent::modifiers() {
+    if(modifiersLoaded) return _modifiers;
+    modifiersLoaded = true;
+    return _modifiers = static_cast<Modifier>(SDL_GetModState());
+}
+
 }}

src/Platform/Sdl2Application.h

@@ -343,11 +343,20 @@ class Sdl2Application::MouseEvent: public Sdl2Application::InputEvent {
         /** @brief Position */
         inline Math::Vector2<int> position() const { return _position; }
 
+        /**
+         * @brief Modifiers
+         *
+         * Lazily populated on first request.
+         */
+        Modifiers modifiers();
+
     private:
-        inline MouseEvent(Button button, const Math::Vector2<int>& position): _button(button), _position(position) {}
+        inline MouseEvent(Button button, const Math::Vector2<int>& position): _button(button), _position(position), modifiersLoaded(false) {}
 
         const Button _button;
         const Math::Vector2<int> _position;
+        bool modifiersLoaded;
+        Modifiers _modifiers;
 };
 
 /**
@@ -362,10 +371,19 @@ class Sdl2Application::MouseMoveEvent: public Sdl2Application::InputEvent {
         /** @brief Position */
         inline Math::Vector2<int> position() const { return _position; }
 
+        /**
+         * @brief Modifiers
+         *
+         * Lazily populated on first request.
+         */
+        Modifiers modifiers();
+
     private:
-        inline MouseMoveEvent(const Math::Vector2<int>& position): _position(position) {}
+        inline MouseMoveEvent(const Math::Vector2<int>& position): _position(position), modifiersLoaded(false) {}
 
         const Math::Vector2<int> _position;
+        bool modifiersLoaded;
+        Modifiers _modifiers;
 };
 
 /** @hideinitializer