class MSvgListener |
This empty virtual class is defined to be the root class for SVG Listener interfaces (all pure virtual functions). The MSvgListener name will be used for parameters of AddListener and RemoveListener along with a type parameter to specific the subclass.
This will allow new Listener class to be added without having to add new Add/Remove listener methods to the exported interfaces.
Existing listeners (Hyperlink, etc.) and their Add/Remove methods will remain the same.
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