Do I want to receive mouseEnter: and mouseLeave: when the button is up and the hand is empty? The default response is false, except if you have added sensitivity to mouseEnter: or mouseLeave:, using the on:send:to: mechanism.
Return true if I want to receive mouseEnterDragging: and mouseLeaveDragging: when the hand drags something over me (button up or button down), or when the mouse button is down but there is no mouseDown recipient. The default response is false, except if you have added sensitivity to mouseEnterLaden: or mouseLeaveLaden:, using the on:send:to: mechanism.
Handle a mouseEnter event, meaning the mouse just entered my bounds with no button pressed. The default response is to let my eventHandler, if any, handle it.
Handle a mouseEnterDragging event, meaning the mouse just entered my bounds with a button pressed or laden with submorphs. The default response is to let my eventHandler, if any, handle it, or else to do nothing.
