diff --git a/gb.gtk/src/CMouse.cpp b/gb.gtk/src/CMouse.cpp
index efe20d28a..b3a5c336e 100644
--- a/gb.gtk/src/CMouse.cpp
+++ b/gb.gtk/src/CMouse.cpp
@@ -197,6 +197,13 @@ BEGIN_PROPERTY(Mouse_Delta)
 
 END_PROPERTY
 
+BEGIN_PROPERTY(Mouse_FullDelta)
+
+	CHECK_VALID();
+	GB.ReturnBoolean(TRUE);
+
+END_PROPERTY
+
 BEGIN_PROPERTY(Mouse_Orientation)
 
 	CHECK_VALID();
@@ -440,6 +447,7 @@ GB_DESC CMouseDesc[] =
 	GB_STATIC_PROPERTY_READ("Normal", "b", Mouse_Normal),
 	GB_STATIC_PROPERTY_READ("Orientation", "i", Mouse_Orientation),
 	GB_STATIC_PROPERTY_READ("Delta", "f", Mouse_Delta),
+	GB_STATIC_PROPERTY_READ("FullDelta", "b", Mouse_FullDelta),
 	GB_STATIC_PROPERTY_READ("Forward", "b", Mouse_Forward),
 	GB_STATIC_PROPERTY_READ("Click", "i", Mouse_Click),
 	
diff --git a/gb.qt4/src/CMouse.cpp b/gb.qt4/src/CMouse.cpp
index 5fb98ff3c..a1c7d94f7 100644
--- a/gb.qt4/src/CMouse.cpp
+++ b/gb.qt4/src/CMouse.cpp
@@ -44,6 +44,10 @@ double MOUSE_timer = 0;
 MOUSE_INFO MOUSE_info = { 0 };
 POINTER_INFO POINTER_info = { 0 };
 
+int MOUSE_delta_x = 0;
+int MOUSE_delta_y = 0;
+void *MOUSE_wheel_on_control = NULL;
+
 static int _dx = 0;
 static int _dy = 0;
 
@@ -366,6 +370,13 @@ BEGIN_PROPERTY(Mouse_Delta)
 
 END_PROPERTY
 
+BEGIN_PROPERTY(Mouse_FullDelta)
+
+	CHECK_VALID();
+	GB.ReturnBoolean(abs(MOUSE_info.orientation == Qt::Horizontal ? MOUSE_delta_x : MOUSE_delta_y) >= 120);
+
+END_PROPERTY
+
 BEGIN_PROPERTY(Mouse_Forward)
 
 	CHECK_VALID();
@@ -643,6 +654,7 @@ GB_DESC CMouseDesc[] =
 	GB_STATIC_PROPERTY_READ("Meta", "b", Mouse_Meta),
 	GB_STATIC_PROPERTY_READ("Normal", "b", Mouse_Normal),
 	GB_STATIC_PROPERTY_READ("Orientation", "i", Mouse_Orientation),
+	GB_STATIC_PROPERTY_READ("FullDelta", "b", Mouse_FullDelta),
 	GB_STATIC_PROPERTY_READ("Delta", "f", Mouse_Delta),
 	GB_STATIC_PROPERTY_READ("Forward", "b", Mouse_Forward),
 	GB_STATIC_PROPERTY_READ("Click", "i", Mouse_Click),
diff --git a/gb.qt4/src/CMouse.h b/gb.qt4/src/CMouse.h
index e99a3c0fe..a2ba4f77f 100644
--- a/gb.qt4/src/CMouse.h
+++ b/gb.qt4/src/CMouse.h
@@ -41,12 +41,12 @@ typedef
 		Qt::MouseButton button;
 		Qt::MouseButtons state;
 		Qt::KeyboardModifiers modifier;
-		int orientation;
 		int delta;
 		int screenX;
 		int screenY;
 		int dx;
 		int dy;
+		int orientation;
 		}
 	MOUSE_INFO;
 	
@@ -76,6 +76,10 @@ extern double MOUSE_timer;
 extern MOUSE_INFO MOUSE_info;
 extern POINTER_INFO POINTER_info;
 
+extern int MOUSE_delta_x;
+extern int MOUSE_delta_y;
+extern void *MOUSE_wheel_on_control;
+
 #else
 
 #define THIS ((CCURSOR *)_object)
diff --git a/gb.qt4/src/CWidget.cpp b/gb.qt4/src/CWidget.cpp
index 1fa781638..354967748 100644
--- a/gb.qt4/src/CWidget.cpp
+++ b/gb.qt4/src/CWidget.cpp
@@ -2299,6 +2299,7 @@ void CWidget::destroy()
 	CLEAN_POINTER(CWIDGET_previous_control);
 	CLEAN_POINTER(CWIDGET_hovered);
 	CLEAN_POINTER(_old_active_control);
+	CLEAN_POINTER(MOUSE_wheel_on_control);
 #if QT5
 	CLEAN_POINTER(_last_entered);
 #endif
@@ -3147,25 +3148,43 @@ bool CWidget::eventFilter(QObject *widget, QEvent *event)
 #endif
 				MOUSE_info.state = ev->buttons();
 				MOUSE_info.modifier = ev->modifiers();
+
+				if (control != MOUSE_wheel_on_control)
+				{
+					MOUSE_wheel_on_control = control;
+					MOUSE_delta_x = MOUSE_delta_y = 0;
+				}
 				
 #ifdef QT5
 				QPoint delta = ev->angleDelta();
 				if (delta.x())
 				{
+					MOUSE_delta_x += delta.x();
 					MOUSE_info.orientation = Qt::Horizontal;
 					MOUSE_info.delta = delta.x();
 					cancel = GB.Raise(control, EVENT_MouseWheel, 0);
+					MOUSE_delta_x %= 120;
 				}
 				if (delta.y())
 				{
+					MOUSE_delta_y += delta.y();
 					MOUSE_info.orientation = Qt::Vertical;
 					MOUSE_info.delta = delta.y();
 					cancel = GB.Raise(control, EVENT_MouseWheel, 0);
+					MOUSE_delta_y %= 120;
 				}
 #else
+				if (ev->orientation == Qt!!Horizontal)
+					MOUSE_delta_x += ev->delta();
+				else
+					MOUSE_delta_y += ev->delta();
 				MOUSE_info.orientation = ev->orientation();
 				MOUSE_info.delta = ev->delta();
 				cancel = GB.Raise(control, EVENT_MouseWheel, 0);
+				if (ev->orientation == Qt!!Horizontal)
+					MOUSE_delta_x %= 120;
+				else
+					MOUSE_delta_y %= 120;
 #endif