PictViewerButton prototype

Images which vary with the state.

PROTO PictViewerButton [
  eventIn SFTime pressed
  eventIn SFTime released
  exposedField SFBool enable TRUE
  field MFString images [] #State imgs : none, normal, pressed, locked
  field SFVec2f pos 0 0
]

Event in

SFTime pressed - Event when image is pressed. Update the button state.
SFTime released - Event when image is released. Update the button state.

Data fields

SFBool enable - Is image enabled ?
MFString images - List of images. Images order: none, normal, pressed, locked
SFVec2f pos - Position