Here is a list of all namespace enums with links to the namespace documentation for each enum:

Axis : sf::Joystick
Button : sf::Mouse
CoordinateType : sf
Key : sf::Keyboard
PrimitiveType : sf
Scan : sf::Keyboard
SoundChannel : sf
State : sf
StencilComparison : sf
StencilUpdateOperation : sf
Type : sf::Sensor
Wheel : sf::Mouse