Grabmouse is not used when using a virtual controller that doesn't output

analog data (ie, not a mouse).  This fixes the issue of mouse grabbing
when a ROM isn't even using the mouse.

src/emucore/EventHandler.cxx

@@ -1868,6 +1868,26 @@ void EventHandler::takeSnapshot(uInt32 number)
   }
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool EventHandler::controllerIsAnalog(Controller::Jack jack) const
+{
+  const Controller& controller = jack == Controller::Left ?
+      myOSystem.console().leftController() : myOSystem.console().rightController();
+
+  switch(controller.type())
+  {
+    case Controller::Paddles:
+    case Controller::Driving:
+    case Controller::TrackBall22:
+    case Controller::TrackBall80:
+    case Controller::AmigaMouse:
+    case Controller::MindLink:
+      return true;
+    default:
+      return false;
+  }
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void EventHandler::setMouseControllerMode(const string& enable)
 {
@@ -1880,32 +1900,9 @@ void EventHandler::setMouseControllerMode(const string& enable)
       usemouse = false;
     else  // 'analog'
     {
-      switch(myOSystem.console().leftController().type())
-      {
-        case Controller::Paddles:
-        case Controller::Driving:
-        case Controller::TrackBall22:
-        case Controller::TrackBall80:
-        case Controller::AmigaMouse:
-        case Controller::MindLink:
+      if(controllerIsAnalog(Controller::Left) ||
+         controllerIsAnalog(Controller::Right))
         usemouse = true;
-          break;
-        default:
-          break;
-      }
-      switch(myOSystem.console().rightController().type())
-      {
-        case Controller::Paddles:
-        case Controller::Driving:
-        case Controller::TrackBall22:
-        case Controller::TrackBall80:
-        case Controller::AmigaMouse:
-        case Controller::MindLink:
-          usemouse = true;
-          break;
-        default:
-          break;
-      }
     }
 
     const string& control = usemouse ?

src/emucore/EventHandler.hxx

@@ -314,6 +314,14 @@ class EventHandler
     */
     void allowAllDirections(bool allow) { myAllowAllDirectionsFlag = allow; }
 
+    /**
+      Determines whether the given controller must use the mouse (aka,
+      whether the controller generates analog output).
+
+      @param jack  The controller to query
+    */
+    bool controllerIsAnalog(Controller::Jack jack) const;
+
     /**
       Return a list of all joysticks currently in the internal database
       (first part of variant) and its internal ID (second part of variant).

src/emucore/FrameBuffer.cxx

@@ -581,10 +581,15 @@ bool FrameBuffer::changeWindowedVidMode(int direction)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void FrameBuffer::setCursorState()
 {
-  // Always grab mouse in emulation (if enabled)
+  // Always grab mouse in emulation (if enabled) and emulating a controller
+  // that always uses the mouse
   bool emulation =
       myOSystem.eventHandler().state() == EventHandler::S_EMULATE;
-  grabMouse(emulation && myOSystem.settings().getBool("grabmouse"));
+  bool analog = myOSystem.hasConsole() ?
+      (myOSystem.eventHandler().controllerIsAnalog(Controller::Left) ||
+       myOSystem.eventHandler().controllerIsAnalog(Controller::Right)) : false;
+
+  grabMouse(emulation && analog && myOSystem.settings().getBool("grabmouse"));
 
   // Show/hide cursor in UI/emulation mode based on 'cursor' setting
   switch(myOSystem.settings().getInt("cursor"))