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IBuiltInControlListener

Describes built-in control listener. It could be set by parent and used to receive notifications from built-in control.

You can find more information in comments below.

class IBuiltInControlListener // Listener can be set by owner to get notifications when built-in control state is changed by timer or other method which isn't initiated by owner
{
public:
    virtual void NotifyOnRepaint(IBuiltInControl *sender, const RectF &rect) = 0; // Notify parent about repainting required
};