osx - NSWindow.contentView.hittest() Doesn't Reach Subviews of NSOutlineView -

my app's window has splitview 3 panes; leftmost pane hosts view-based outline view.

when click somewhere on outline view, want determine bottom-most subview in hierarchy clicked. is, row, cell, , subview (control) of cell clicked.

i tried overriding mousedown(with:) on hosting view controller, isn't called; suspected outline view somehow hogging event instead decided override method directly on nsoutlineview subclass itself. works. however, there can not go further down hierarchy outline view itself:

class myoutlineview: nsoutlineview {

override func mousedown(with event: nsevent) {     if let view = self.window?.contentview?.hittest(event.locationinwindow) {         swift.print("\(view.classname)")     } } 

...prints:

mymodule. myoutlineview

the documentation hittest() reads:

returns farthest descendant of view in view hierarchy (including itself) contains specified point, or nil if point lies outside view. method used nswindow object determine view should receive mouse-down event. you’d need invoke method, might want override have view object hide mouse-down events subviews. method ignores hidden views.

how can hit-test topmost subviews of outline view?

mousedown(with:) called on views, not on controllers. control inside outline view handles mousedown.

but if want find control, yes, -[nstableview(nstableviewrowheadersupport) hittest:] messes things up. workaround: row , column, cell view , call hittest on cell view.

override func mousedown(with event: nsevent) {     let localpoint = self.convert(event.locationinwindow, from: nil)     let column = self.column(at: localpoint)     let row = self.row(at: localpoint)     if column >= 0 && row >= 0 {         if let cellview = self.view(atcolumn: column, row: row, makeifnecessary: false) {             if let cellsuperviewpoint = cellview.superview?.convert(localpoint, from: self) {                 if let view = cellview.hittest(cellsuperviewpoint) {                     swift.print("\(view.classname)")                 }             }         }     } }