I'm trying to get my NSScrollView (and thus a contained NSOutlineView) to use a blurred NSVisualEffectView with behind-window blending effect.
I've successfully made NSVisualEffectView the container view and placed my scroll view as a subview. This seems to work fine (as long as I make all my table cells, table, nsscrollview etc transparent).
However I've now turned 'Reduce transparency' ON under Accessibility options and all of a sudden I have a black background behind my NSScrollView. I tried subclassing the visual effect view in order to override the drawRect method so that I can draw my own background, but I've just learned this isn't possible or recommended.
How do I detect that Reduce Transparency is ON and how do I make my scrollview opaque dynamically?
Took me a while to find it, but there are a couple of new methods on NSWorkspace that you can use to find out about the preferences for OS X Yosemite’s new accessibility features. -[NSWorkspace accessibilityDisplayShouldReduceTransparency] is the one you want.
By Listening for NSWorkspaceAccessibilityDisplayOptionsDidChangeNotification you can find out when that preference changes. Note that you’ll have to register for that notification on the correct NSNotificationCenter, that is [[NSWorkspace sharedWorkspace] notificationCenter].