+ // If the emulator is tracking mouse buttons, it needs to see wheel
+ // events.
+ if (emulator.getMouseProtocol() == ECMA48.MouseProtocol.OFF) {
+ if (mouse.isMouseWheelUp()) {
+ verticalDecrement();
+ return;
+ }
+ if (mouse.isMouseWheelDown()) {
+ verticalIncrement();
+ return;
+ }