Everything related to user interface.
The User Interface framework enables your Pebble watchface or watchapp to handle basic UI components, like clicks, layers, vibes, windows and window stacks.
Abstract framework to create arbitrary animations.
Handling button click interactions.
User interface layers for displaying graphic components.
Controlling Pebble's backlight.
Values recommended by the system.
Controlling the vibration motor.
The basic building block of the user interface.
The multiple window manager.