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fcitx5-m3ui/README.md
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justmeandClaude Sonnet 5.5 0804634dc1 Add Material 3 candidate window addon for Fcitx5
Fork of the classicui addon (Fcitx5 5.1.23) with a Material 3 look, spring
based animations and a right click action menu for candidates.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
2026-10-19 21:58:54 +08:00

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# fcitx5-m3ui
A Material 3 styled candidate window for [Fcitx5](https://github.com/fcitx/fcitx5),
built as a user interface addon (`m3ui`) that replaces `classicui`.
[简体中文](README.zh-CN.md)
## Features
- Rounded Material 3 panel with light and dark themes that follow the system.
- Spring based animations: the panel slides in with a small bounce and fades in,
the highlight pill glides between candidates. Stiffness and damping are
configurable.
- Right click a candidate to open an action menu. It shows whatever actions the
input method offers, for Pinyin that is *Forget candidate*, *Pin to top as
custom phrase* and *Delete from custom phrase*.
- Works on Wayland and X11 (Xwayland) input contexts, positioning and pointer
handling are inherited from `classicui`.
- Optional KWin helper that shortens KWin's own fade out for the candidate
window only.
## Status
Personal project, only tried on Fedora 44, KDE Plasma 6.7 on Wayland, NVIDIA
GPU, Fcitx5 5.1.23 with the Pinyin engine. The build scripts have not been run
on any other setup.
The addon is a fork of `classicui` and is built inside the Fcitx5 source tree,
because Fcitx5's Wayland protocol wrappers are not installed by `fcitx5-devel`.
The Fcitx5 source version used for the build must match the installed Fcitx5.
There is no fade out animation of its own: on Wayland the window is destroyed as
soon as the panel has nothing to show.
## Build
Needs the Fcitx5 development files and the dependencies of `classicui`
(cairo, pango, librsvg, gdk-pixbuf, wayland-protocols, xcb libraries). On Fedora:
```
sudo dnf install fcitx5-devel extra-cmake-modules cairo-devel pango-devel \
gdk-pixbuf2-devel librsvg2-devel wayland-protocols-devel \
plasma-wayland-protocols-devel systemd-devel libuuid-devel fmt-devel \
expat-devel iso-codes-devel json-devel xkeyboard-config-devel \
xcb-util-devel xcb-util-keysyms-devel xcb-util-wm-devel \
xcb-util-image-devel xcb-imdkit-devel libxkbfile-devel libxkbcommon-x11-devel
```
then
```
scripts/build.sh # downloads Fcitx5 + yoga, overlays src/, builds m3ui
scripts/install.sh # installs into ~/.local, nothing outside $HOME
```
`build.sh` picks the Fcitx5 version from `pkg-config`, override it with
`FCITX_VERSION`.
## Use
```
FCITX_ADDON_DIRS=$HOME/.local/m3ui/lib64/fcitx5:/usr/lib64/fcitx5 fcitx5 -r -u m3ui
```
`FCITX_ADDON_DIRS` is how Fcitx5 finds addons outside the system directory, it
has to be set in the environment that starts Fcitx5 if you want this on every
login. `fcitx5 -r` brings the stock interface back.
Settings live in `~/.config/fcitx5/conf/m3ui.conf`, see
[config/m3ui.conf.example](config/m3ui.conf.example).
| Key | Default | Meaning |
|---|---|---|
| `Animations` | True | Master switch for animations |
| `Bounce` | True | Off makes movement critically damped (no overshoot) |
| `SpatialStiffness` | 2000 | Spring stiffness for movement, higher is faster |
| `SpatialDamping` | 62 | Damping ratio in percent, lower bounces more |
| `EffectsStiffness` | 3800 | Spring stiffness for fading |
| `SlideDistance` | 22 | Slide in distance in px |
| `SlideDirection` | 0 | 0 from left, 1 from right, 2 from below |
| `Theme` / `DarkTheme` | `m3ui-light` / `m3ui-dark` | Themes in `themes/` |
Themes are classicui themes with extra keys in `[InputPanel]`: `SurfaceColor`,
`OutlineColor`, `HighlightFillColor`, `PanelRadius`, `ItemRadius`. A transparent
`SurfaceColor` falls back to the classic image based drawing, so classic themes
still work (without animation).
## KWin fade out (optional, KDE Plasma)
KWin's *Fading Popups* effect fades popups out over 600 ms and the candidate
window counts as a popup. `kwin/install-fadingpopups-override.sh` copies the
effect from your system into `~/.local/share/kwin-wayland/effects/` and patches
the copy so only the window class `fcitx fcitx` is affected. The script fails
if the upstream effect source no longer matches what it patches.
## License
LGPL-2.1-or-later, see [NOTICE.md](NOTICE.md).