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Movement: the community watch face app
======================================
The Sensor Watch Library allows you to write your own bare-metal applications for the Sensor Watch. This is great if you want full control over the code running on the device, but it also means that you may have to implement your own UI for many common tasks like setting the time or illuminating the screen.
**Movement** is an application that manages the display of different screens of content on the watch. These screens are called **watch faces**. Watch faces can be passive displays of information like a clock or a calendar, or they can be fully interactive user interfaces like the Preferences face, which allows the user to customize Movement's behavior. Movement handles the instantiation of your watch face and manages transitions between screens. It also provides a low-power sleep mode, triggered after a period of inactivity, to preserve the watch battery.
Several faces are provided that offer baseline functionality like a clock, a settings screen and an interface for setting the time. You can change and reorder the watch faces that Movement displays by editing `movement_config.h`, and you can write your own watch face using the guidance in this document.
Watch Face API
--------------
You can implement a watch face using just four functions:
* `watch_face_setup`
* `watch_face_activate`
* `watch_face_loop`
* `watch_face_resign`
A fifth optional function, `watch_face_wants_background_task`, has not yet had its implementation ironed out, but it will be added to the guide at a later date.
To create a new watch face, you should create a new C header and source file in the watch-faces folder (i.e. for a watch face that displays moon phases: `moon_phase_face.h`, `moon_phase_face.c`), and implement these functions with your own unique prefix (i.e. `moon_phase_face_setup`). Then declare your watch face in your header file as follows:
```c
static const watch_face_t moon_phase_face = {
moon_phase_face_setup,
moon_phase_face_activate,
moon_phase_face_loop,
moon_phase_face_resign,
NULL // or moon_phase_face_wants_background_task, if you implemented this function
|
