After further investigation, I've discovered what code is responsible for
globally breaking scrolling my app. I have an NSScrollView subclass with the
following override:
- (void) scrollWheel:(NSEvent*)event
{
BOOL isScrollEnclosing = // YES if the receiver has scrolled to its
very top/bottom
if( isScrollEnclosing ) {
[[self enclosingScrollView] scrollWheel:event];
}
else {
[super scrollWheel:event];
}
}
I'm not sure the code is breaking any rules, but it apparently intermittently
rubs AppKit the wrong way. At least if the user has a multi-touch trackpad.
Macs with older trackpads (or just mice) seem to be unaffected.
Using the following code instead avoids the problem and still achieves the
desired behavior:
- (void) scrollWheel:(NSEvent*)event
{
BOOL isScrollEnclosing = // YES if the receiver has scrolled to its
very top/bottom
if( isScrollEnclosing ) {
CGEventRef cgEvent = CGEventCreateScrollWheelEvent( ... );
if( NULL != cgEvent ) {
NSEvent* fakeEvent = [NSEvent eventWithCGEvent:cgEvent];
[[self enclosingScrollView] scrollWheel:fakeEvent];
CFRelease(cgEvent);
}
}
[super scrollWheel:event];
}
I’m posting this on the off-chance it might be helpful to someone else down the
line.
~Martin Wierschin
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