DisplayEvent class. It adds
information specific to events occuring on WorldCanvases, viz.
a pointer to the WorldCanvas itself.
Example
Motivation
It is desirable to locate in a single place the information which
is common to all events occuring on WorldCanvases.
Thrown Exceptions
To Do
Member Description
Constructor, taking a pointer to a WorldCanvas.
Destructor.
Return a pointer to the WorldCanvas on which the event occurred.
(Required) default constructor.
(Required) copy constructor.
WorldCanvasEvent &operator=(const WorldCanvasEvent &other)
(Required) copy assignment.