Added InputEvent::MouseWheel event. Also added onMouseWheel event for Node.

Enabled wheel scroll momentum for macOS on ecode.

include/eepp/scene/eventdispatcher.hpp

@@ -68,6 +68,8 @@ class EE_API EventDispatcher {
 
 	void sendMouseDown( Node* toNode, const Vector2i& pos, const Uint32 flags );
 
+	void sendMouseWheel( const Vector2f& offset, bool flipped );
+
 	const Uint32& getPressTrigger() const;
 
 	const Uint32& getLastPressTrigger() const;

include/eepp/scene/node.hpp

@@ -495,6 +495,8 @@ class EE_API Node : public Transformable {
 
 	virtual Uint32 onMouseLeave( const Vector2i& position, const Uint32& flags );
 
+	virtual Uint32 onMouseWheel( const Vector2f& offset, bool flipped );
+
 	virtual Uint32 onCalculateDrag( const Vector2f& position, const Uint32& flags );
 
 	void onClose();

include/eepp/window/inputevent.hpp

@@ -76,6 +76,14 @@ class InputEvent {
 		Int16 x, y;	  /** The X/Y coordinates of the mouse at press time */
 	};
 
+	struct WheelEvent {
+		enum Direction { Normal, Flipped };
+		Uint32 which;
+		Float x;
+		Float y;
+		Direction direction;
+	};
+
 	/** Touch finger motion/finger event structure */
 	struct FingerEvent {
 		Uint32 timestamp;
@@ -204,6 +212,7 @@ class InputEvent {
 		FileDropped,
 		TextDropped,
 		TextEditing,
+		MouseWheel,
 		EventUser,
 		EventCount = EventUser - 1
 	};
@@ -233,6 +242,7 @@ class InputEvent {
 		TextEditingEvent textediting;
 		QuitEvent quit;
 		UserEvent user;
+		WheelEvent wheel;
 		SysWMEvent syswm;
 	};
 };

src/eepp/scene/eventdispatcher.cpp

@@ -66,6 +66,11 @@ void EventDispatcher::inputCallback( InputEvent* event ) {
 			sendTextEditing( event->textediting.text, event->textediting.start,
 							 event->textediting.length );
 			break;
+		case InputEvent::MouseWheel:
+			sendMouseWheel( { event->wheel.x, event->wheel.y },
+							event->wheel.direction == InputEvent::WheelEvent::Normal ? true
+																					 : false );
+			break;
 		case InputEvent::SysWM:
 		case InputEvent::VideoResize:
 		case InputEvent::VideoExpose: {
@@ -253,6 +258,15 @@ void EventDispatcher::sendKeyDown( const Keycode& keyCode, const Scancode& scanc
 	}
 }
 
+void EventDispatcher::sendMouseWheel( const Vector2f& offset, bool flipped ) {
+	Node* node = mFocusNode;
+	while ( NULL != node ) {
+		if ( node->isEnabled() && node->onMouseWheel( offset, flipped ) )
+			break;
+		node = node->getParent();
+	}
+}
+
 void EventDispatcher::sendMsg( Node* node, const Uint32& Msg, const Uint32& Flags ) {
 	NodeMessage tMsg( node, Msg, Flags );
 	node->messagePost( &tMsg );

src/eepp/scene/node.cpp

@@ -397,6 +397,10 @@ Uint32 Node::onMouseLeave( const Vector2i& Pos, const Uint32& Flags ) {
 	return 1;
 }
 
+Uint32 Node::onMouseWheel( const Vector2f& offset, bool flipped ) {
+	return 1;
+}
+
 Uint32 Node::onCalculateDrag( const Vector2f&, const Uint32& ) {
 	return 1;
 }

src/eepp/window/backend/SDL2/inputsdl2.cpp

@@ -357,6 +357,22 @@ void InputSDL::sendEvent( const SDL_Event& SDLEvent ) {
 
 			event.Type = InputEvent::MouseButtonUp;
 			event.button.state = 0;
+			processEvent( &event );
+
+			event.Type = InputEvent::MouseWheel;
+			event.wheel.which = SDLEvent.wheel.which;
+			event.wheel.direction = SDLEvent.wheel.direction == SDL_MOUSEWHEEL_NORMAL
+										? InputEvent::WheelEvent::Normal
+										: InputEvent::WheelEvent::Flipped;
+
+#if SDL_VERSION_ATLEAST( 2, 0, 18 )
+			event.wheel.x = SDLEvent.wheel.preciseX;
+			event.wheel.y = SDLEvent.wheel.preciseY;
+#else
+			event.wheel.x = SDLEvent.wheel.x;
+			event.wheel.y = SDLEvent.wheel.y;
+#endif
+			processEvent( &event );
 			break;
 		}
 		case SDL_FINGERMOTION: {

src/tools/ecode/ecode.cpp

@@ -3287,6 +3287,7 @@ void App::init( const LogLevel& logLevel, std::string file, const Float& pidelDe
 #endif
 #if EE_PLATFORM == EE_PLATFORM_MACOS
 		macOS_CreateApplicationMenus();
+		macOS_EnableScrollMomentum();
 
 		mThreadPool->run( [this]() {
 			// Checks if the default shell path contains more paths

src/tools/ecode/macos/macos.hpp

@@ -7,6 +7,8 @@ extern "C" {
 
 void macOS_CreateApplicationMenus();
 
+void macOS_EnableScrollMomentum();
+
 #ifdef __cplusplus
 }
 #endif

src/tools/ecode/macos/macos.m

@@ -63,3 +63,7 @@ macOS_CreateApplicationMenus(void)
 
 	[NSApp setWindowsMenu:windowMenu];
 }
+
+void macOS_EnableScrollMomentum() {
+	[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"AppleMomentumScrollSupported"];
+}