Added basic theming engine.

This theming engine uses a bytestring (but supports anything indexable,
as long as the index results are a byte long),
stored as `wasp.system._theme`.
It has a default value, which should not change anything about the way this looks currently.

The theme can be set via `wasp.system.set_theme`,
but this should *ONLY* be used in `main.py`.
`wasp.system.set_theme` will return True if it was successful,
or False if the theme is of an old format.
Using an old format theme will *not* crash the watch,
but will use the default theme instead.

To theme this, one has to use tools/themer.py (use flag -h for complete explanation)
to generate a bytestring that's added in main.py (see diff).

The bytestring is then loaded into 'wasp.system._theme'.
Theme values can be looked up by apps by using `wasp.system.theme("theme-key")`.
Theme keys appear in the function body of `wasp.system.theme()`.

I've took the liberty of converting existing apps to use this method,
and it seems to work well.

A test theme is provided in `tools/test_theme.py`

Signed-off-by: kozova1 <mug66kk@gmail.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/tools/test_theme.py b/tools/test_theme.py
new file mode 100644
index 0000000..dc2b990
--- /dev/null
+++ b/tools/test_theme.py
@@ -0,0 +1,15 @@
+from themer import DefaultTheme
+
+class Theme(DefaultTheme):
+    # These colors were chosen specifically because they're hard to miss.
+    # Using this theme on an actual device is not advised
+    # The default theme was generated by removing all the lines below and adding `pass` instead.
+    BLE_COLOR = 0xfb80
+    SCROLL_INDICATOR_COLOR = 0xf800
+    BATTERY_CHARGING_COLOR = 0x07ff
+    SMALL_CLOCK_COLOR = 0x599f
+    NOTIFICATION_COLOR = 0x8fe0
+    ACCENT_MID = 0xf800
+    ACCENT_LO = 0x001f
+    ACCENT_HI = 0x07e0
+    SLIDER_DEFAULT_COLOR = 0x7777