Highlight NSView on Rollover/Click

Upon rolling over or clicking on an NSView, how can I update the view so that I can change the colour and other properties of view? It's the redra开发者_如何学JAVAwing of the view which is the key to what I need to do, I already have a subclass created.

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Listen for mouse events and do appropriate actions inside them.

-(void)mouseEntered:(NSEvent *)theEvent {
    //draw rollover
}

-(void)mouseExited:(NSEvent *)theEvent {
    //draw normal
}

-(void)mouseDown:(NSEvent *)theEvent {
    //draw selected
}

-(void)mouseUp:(NSEvent *)theEvent {
    //draw normal
}