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