## Summary
* **What is the goal of this PR?** Fixes#2402. On the X3, the "Time to
Sleep"
picker's 5-minute side buttons were inverted (left increased, right
decreased)
and the on-screen legend didn't match the physical buttons.
* **What changes are included?**
* Flip the large-step (±5 min) direction on X3 so the left side button
decreases and the right increases, matching the layout. X4 is unchanged.
* Add a device-specific step-hint string
(`STR_SLEEP_TIMER_STEP_HINT_X3`)
selected via `gpio.deviceIsX3()`. X3 shows `+/-: 1 min Side buttons: 5
min`;
X4 keeps the original `Left/Right: 1 min Up/Down: 5 min`.
* Same fix applied to both slider pickers that read the raw up/down side
buttons: the Time-to-Sleep picker and the "Go to %" picker
(`EpubReaderPercentSelectionActivity`), each with its own X3 hint string
(`STR_SLEEP_TIMER_STEP_HINT_X3`, `STR_PERCENT_STEP_HINT_X3`).
## Additional Context
* **Root cause:** the X3's side buttons sit one on each edge of the
screen
(power on top), whereas the X4 has a vertical up/down rocker on the
right
edge. So `BTN_UP` is physically the *left* button on X3 but the *top*
button
on X4. The picker mapped up→+5 / down→−5 unconditionally, which reads
naturally on the X4 rocker but inverted on the X3's left/right buttons.
The
static legend ("Up/Down: 5 min") had the same X3-only mismatch.
* The codebase already detects the device at runtime and handles this
layout
difference elsewhere (e.g. `LyraTheme::drawSideButtonHints` draws "Up on
left,
Down on right" for X3), so this reuses the same `gpio.deviceIsX3()`
signal.
* Swept the codebase for other side-button sliders:
`ClockOffsetActivity` already
uses the `Next/Previous` (`ButtonNavigator`) abstraction, which resolves
to
left=decrement / right=increment on X3, so it needs no change. List/page
navigation (Wi-Fi, KOReader sync, BMP viewer) and the keyboard cursor
are also
unaffected. The two slider pickers above were the only ones using raw
up/down.
* **X4 is untouched** — same direction, same legend wording as before.
* **Tested on X3 hardware:** left side button now decreases, right
increases, and
the legend matches. X4 not yet tested on device (no unit on hand); its
behaviour and strings are unchanged from master.
* **Translations:** the new `STR_SLEEP_TIMER_STEP_HINT_X3` and
`STR_PERCENT_STEP_HINT_X3` were added to all 26 languages, but the
non-English
ones are AI-generated and would benefit from a native-speaker pass —
particularly Hebrew (RTL ordering with a leading `+/-`), Kazakh, and
Vietnamese.
---
### AI Usage
Did you use AI tools to help write this code? _**YES**_
---------
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This PR moves us from the xteink openx4 SDK to the freeink sdk from
https://freeink.org. Out of the box there are NO changes needed in the
firmware to support this swap, it all magically works as is. However as
we support more than just the x3/x4 devices, this sdk allows us to pass
env vars into the build commands to include support for other devices.
As support for new hardware such as touch screens and bluetooth are
added the xteink builds decide at compile time if the libraries are used
or not. For example right now the freeinkui and icons libraries are in
the platform.io file but as they are not used anywhere, they won't be
included in the final build. Once the touch branch and sd themes branch
are merged in this sdk is required for them to function correctly. All
the docs for freeink are available at freeink.org/docs. x4/x3 is a
single binary build unlike other devices that will build unique binaries
for each device. Eventually we will want to remove a lot of the manual
isx3 type stuff from our firmware and go through the boardsupport api
the sdk provides as it will generalize everything into one common system
that any device can support. The upcoming touch branch does a lot of
this for us but this initial PR is JUST to get the sdk swapped over
without any code changes to show seamless integration without any
regressions.
## Improvements
* Moved the File Manager breadcrumb into the Contents card header for a
cleaner, more consistent interface.
* Updated the Wireless Transfer section of the User Guide with clearer
instructions.
* Battery status bar indicator no longer changes position when adding or
removing bookmarks.
## Performance
* Optimized path normalization for faster file handling.
* Significantly improved bookmark rendering by removing unnecessary
XPath lookups.
* Optimized dithered rectangle drawing (fillRectDither) using a
byte-aligned rendering implementation, improving display performance on
supported devices.
## Bug Fixes
* Fixed an issue where the Inverted Orientation label was incorrectly
combined with the Color Filter label for Geman localization.
* Fixed excessive ghosting on the X3 cover screen during sleep
Justin Mitchell