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# Wallpaper engine: wallpapers on a timer
Date: 2026-10-29
## Goal
Change the wallpapers on a timer, from a list per screen picked with a heart
in the wallpaper picker. Timer changes recolour the live desktop but leave the
boot and login surfaces alone; the user's own picks keep doing everything.
## Lists
One plain-text file per screen, one absolute path per line:
`~/.config/keystone/wallpapers/h.list` (DP-1) and `v.list` (DP-3). There are no
portrait images in the gallery, so a screen's list is the user's choice, not
derived from aspect ratio. A path whose file is missing stays in the list and
is skipped by the timer.
## Heart
Back on every thumbnail in `WallpaperTab.qml`, with the glyphs it had before
the companion was removed: outline `\u{F02D5}` on hover, filled `\u{F02D1}` in
`Theme.red` when listed. It reads and toggles the list of the screen the picker
targets (`Wallpapers.target`, H or V). A toggle writes the file at once. It sits
after the pick `MouseArea`, so it takes its own click.
## Engine section
A section on the existing Wallpaper page, not a new page:
- an on/off switch;
- the interval, in minutes;
- the two lists with their counts, each entry removable, a missing file dimmed;
- a Next button that ticks now.
On/off, the interval and the two home wallpapers (below) live in `Prefs`, so
they survive a restart. A running engine is running again after a restart.
## Tick
A `Timer` in the `Wallpapers` singleton, repeating at the interval while the
engine is on.
- Each screen with a non-empty list takes the next path from a shuffle bag:
the list shuffled, drawn without repeats until empty, then reshuffled, with
the path just shown never first in the new round. The bag is not persisted;
a restart reshuffles.
- Both screens go in one `wallp --set` call, through the same path as Apply,
so the burn transition plays. A screen with an empty list is left alone.
- A tick while a `wallp` run is in progress is skipped.
- A tick does not touch staged picks (`pendingH`, `pendingV`).
- The call runs with `UDT_ROTATION=1` in its environment (light run, below).
## Manual picks and the home wallpaper
A manual Apply is always the full run, engine on or off.
Each screen has a home wallpaper, kept in `Prefs`:
- switching the engine on sets each home to what that screen shows;
- a manual Apply while the engine is on sets the home of each screen it
applied, and restarts the timer, so the pick stays up a full interval;
- switching the engine off sets each screen whose current wallpaper differs
from its home back to the home, in one full `wallp --set`. Both equal, or a
home whose file is gone, changes nothing.
The shuffle continues where it was after a manual pick.
## Light run: udt-accent
In `unified-desktop-theme/bin/udt-accent`: with `UDT_ROTATION` set and
non-empty, skip `write_grub`, `write_homepage` and `write_sddm`, and do not
start the `udt-grub` and `udt-homepage` helpers. Everything else runs: the
accent, Hyprland borders, hyprlock, QML palette, Sublime, colors.json,
Firefox, conky, and the keyboard, LED strip, bulb and TV helpers. `wallp` needs
no change: it runs `udt-accent` as a child, which inherits the variable.
## Conky, separately
Conky reloads `conky.conf` in place on an accent change, recreating its window,
and the `dash-workspace` rule in hypr-theme's `sections/dashboard.lua` then
sends the new window to `special:dash` without `silent`, which shows the
special workspace. The rule becomes `workspace = WS .. " silent"`. To be
confirmed by eye on the next accent change.
## Checks
- A runnable check for the shuffle bag, in a `.js` file beside it: no repeat
within a round, a refill after the last, and the last path never first in
the next round (a one-item list excepted).
- A check in `udt-accent`'s selftest that the three writes and two helpers are
skipped with `UDT_ROTATION=1`, against temporary paths.
- By eye: heart, engine section, a tick with the burn, switching off returning
home, conky staying hidden.
## Out of scope
Sequential order, per-screen intervals, persisting the shuffle, rotation from
a terminal `wallp` without the desktop shell.
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