NEWT EVENT_MOUSE_WHEEL_MOVED: Fix Bug 413 - Generate proper mouse wheel events.

> 0: UP
< 0: DOWN
See MouseEvent.getWheelRotation() for details.

OSX/Windows: Default to wheel 'button' 1
OSX: Properly report '<0'
X11: Synthesize wheel events by mapping buttons 4/5 and 6/7 to wheel 1 and 2.

1 files changed, 6 insertions, 12 deletions

diff --git a/src/newt/native/NewtMacWindow.m b/src/newt/native/NewtMacWindow.m
index 1018633b1..ce41673c4 100644
--- a/src/newt/native/NewtMacWindow.m
+++ b/src/newt/native/NewtMacWindow.m
@@ -44,15 +44,17 @@ jint GetDeltaY(NSEvent *event, jint javaMods) {
         // mouse pad case
         deltaY =
             CGEventGetIntegerValueField(cgEvent, kCGScrollWheelEventPointDeltaAxis1);
+        // fprintf(stderr, "WHEEL/PAD: %lf\n", (double)deltaY);
     } else {
         // traditional mouse wheel case
         deltaY = [event deltaY];
+        // fprintf(stderr, "WHEEL/TRAD: %lf\n", (double)deltaY);
         if (deltaY == 0.0 && (javaMods & EVENT_SHIFT_MASK) != 0) {
             // shift+vertical wheel scroll produces horizontal scroll
             // we convert it to vertical
             deltaY = [event deltaX];
         }
-        if (deltaY < 1.0  && deltaY > -1.0) {
+        if (-1.0 < deltaY && deltaY < 1.0) {
             deltaY *= 10.0;
         } else {
             if (deltaY < 0.0) {
@@ -62,14 +64,8 @@ jint GetDeltaY(NSEvent *event, jint javaMods) {
             }
         }
     }
-
-    if (deltaY > 0) {
-        return (NSInteger)deltaY;
-    } else if (deltaY < 0) {
-        return -(NSInteger)deltaY;
-    }
-
-    return 0;
+    // fprintf(stderr, "WHEEL/res: %d\n", (int)deltaY);
+    return (jint) deltaY;
 }
 
 static jmethodID enqueueMouseEventID = NULL;
@@ -581,6 +577,7 @@ static jint mods2JavaMods(NSUInteger mods)
     switch ([event type]) {
     case NSScrollWheel: {
         scrollDeltaY = GetDeltaY(event, javaMods);
+        javaButtonNum = 1;
         break;
     }
     case NSLeftMouseDown:
@@ -598,9 +595,6 @@ static jint mods2JavaMods(NSUInteger mods)
     case NSOtherMouseDragged:
         javaButtonNum = 2;
         break;
-    default:
-        javaButtonNum = 0;
-        break;
     }
 
     if (evType == EVENT_MOUSE_WHEEL_MOVED && scrollDeltaY == 0) {