macOS How can I get mouse location when mouseDown?

[MayPeng]

How can I get mouse location when mouseDown?

 

[Sander]

- (void)mouseDown:(NSEvent *)event
{
    NSPoint p = [event locationInWindow];
}

 

[MayPeng]

- (void)mouseDown:(NSEvent *)event
{
    NSPoint p = [event locationInWindow];
}

Thank you!
But I have another problem. The situation is like this: If I put mouseDown code in the NSView's subclass, it will be called. If I put it in the NSWindowController's subclass , it will not be called. Why?
NSView and NSWindowController are both the NSResponse's subclass, so they should both override super class 's method.