The frame in which a tool tip can be displayed, if needed.
- macOS 10.10+
The frame of the control.
The frame in which the tool tip should be displayed, or
NSZero by default.
This method lets the control return an expansion tool tip frame if
content is too small for the entire contents in the view. When the pointer hovers over the text in certain controls, the full contents will be shown in a special floating tool tip view. If the frame is big enough to display the contents, return an empty rect from this method and no expansion tool tip view will be shown. Note that some subclasses, such as
NSText, return the proper frame when required.