When reaching max or min scroll allow other scroll areas to scroll.

modules/corelib/ui/uiscrollarea.lua

@@ -111,8 +111,15 @@ function UIScrollArea:onMouseWheel(mousePos, mouseWheel)
       return false
     end
     if mouseWheel == MouseWheelUp then
+      if self.verticalScrollBar:getValue() < 1 then
+        return false
+      end
       self.verticalScrollBar:decrement()
     else
+      local maximum = self.verticalScrollBar:getMaximum()
+      if self.verticalScrollBar:getValue() >= maximum then
+        return false
+      end
       self.verticalScrollBar:increment()
     end
   elseif self.horizontalScrollBar then
@@ -120,8 +127,15 @@ function UIScrollArea:onMouseWheel(mousePos, mouseWheel)
       return false
     end
     if mouseWheel == MouseWheelUp then
+      local maximum = self.horizontalScrollBar:getMaximum()
+      if self.horizontalScrollBar:getValue() >= maximum then
+        return false
+      end
       self.horizontalScrollBar:increment()
     else
+      if self.horizontalScrollBar:getValue() < 1 then
+        return false
+      end
       self.horizontalScrollBar:decrement()
     end
   end

modules/corelib/ui/uiscrollbar.lua

@@ -234,19 +234,23 @@ function UIScrollBar:onGeometryChange()
 end
 
 function UIScrollBar:onMouseWheel(mousePos, mouseWheel)
-  if not self.mouseScroll then
+  if not self.mouseScroll or not self:isOn() then
     return false
   end
   if mouseWheel == MouseWheelUp then
     if self.orientation == 'vertical' then
+      if self.value < 1 then  return false end
       self:decrement()
     else
+      if self.value >= self.maximum then return false end
       self:increment()
     end
   else
     if self.orientation == 'vertical' then
+      if self.value >= self.maximum then return false end
       self:increment()
     else
+      if self.value < 1 then  return false end
       self:decrement()
     end
   end