Move window by dragging background (movableByWindowBackground)

Question

I have a window that I want users to be able to move by dragging anywhere in the window content (not just the titlebar). I know that this can be done via the NSWindow movableByWindowBackground method, however this doesn't appear to work by itself.

I gather that overriding NSView mouseDownCanMoveWindow may be necessary. But I can't easily do that for all parent views (split views, etc). Making it a textured window didn't help. Unsurprisingly, subclassing NSWindow to override isMovableByWindowBackground didn't help either.

Is it really necessary to subclass all parent views in the window to make this work?

Answer 1

On OS X 10.11, setting the NSWindow's property movableByWindowBackground to YES works.

There is no longer any need to subclass for this behaviour.

Answer 2

In NSSplitView you add:

override var mouseDownCanMoveWindow: Bool {
    return true
}