Highlighting a NSMenuItem with a custom view?
If you're adding a view to a menu item, that view has to draw the highlight itself. You don't get that for free, I'm afraid. From the Menu Programming Topics:
A menu item with a view does not draw its title, state, font, or other standard drawing attributes, and assigns drawing responsibility entirely to the view.
Here's a rather less long-winded version of the above. It's worked well for me. (backgroundColour is an ivar.)
- (void)drawRect:(NSRect)rect
{
if ([[self enclosingMenuItem] isHighlighted]) {
[[NSColor selectedMenuItemColor] set];
} else if (backgroundColour) {
[backgroundColour set];
}
NSRectFill(rect);
}
Update for 2019:
class CustomMenuItemView: NSView {
private var effectView: NSVisualEffectView
override init(frame: NSRect) {
effectView = NSVisualEffectView()
effectView.state = .active
effectView.material = .selection
effectView.isEmphasized = true
effectView.blendingMode = .behindWindow
super.init(frame: frame)
addSubview(effectView)
effectView.frame = bounds
}
required init?(coder decoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func draw(_ dirtyRect: NSRect) {
effectView.isHidden = !(enclosingMenuItem?.isHighlighted ?? false)
}
}
Set one of those to your menuItem.view
.
(Credit belongs to Sam Soffes who helped me figure this out and sent me almost that code verbatim.)