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PR #351 只给 D2D 候选窗口加了滚轮翻页，WebView2 后端还没有。 网页端只上报一个以 WHEEL_DELTA 为单位的原始 delta，notch 累加仍然 交给 CandidateWheel::ConsumeWheelDelta，两个宿主最终都汇聚到 WM_PAGE_CANDIDATE，翻页逻辑一份不重复。Chromium 的 wheelDeltaY 本身 就是 ±120/格，正是原生累加器期望的单位，deltaY 作标准回退。 同时把滚轮翻页做成可配置的 general.paging_mouse_wheel，默认关闭： 候选宿主是 NOACTIVATE 且从不获得焦点，滚轮只有在 Windows「当我悬停 在非活动窗口上方时滚动它们」开启时才会送达，无法无条件承诺，所以设为 opt-in，设置页里也写明了这个前提。开关只在 WM_PAGE_CANDIDATE 一处 判断；D2D 那边在 WM_MOUSEWHEEL 顶部提前返回 false，关闭时消息照旧 交给 DefWindowProc，与功能加入前一致。
Metasequoia IME for Windows
中文 README · Website · Docs · Privacy
A free and open-source Chinese and Japanese input method for Windows 10 and 11, built on TSF with no legacy IMM32 path.
This repository is the whole Windows product: the TSF text service DLL, the resident server, the conversion engine, a self-written native GUI framework, the HTML surfaces and the installer. The engine was imported from MSIME-Engine and specialized for Windows; it now lives in engine/ as a first-party component, so a plain clone builds the product. See engine/UPSTREAM.md.
This is a public beta. Expect rough edges and read the release notes before upgrading.
Install
Download the installer from Releases or the download page, run it, then switch with Win + Space.
Current builds are not code signed. SmartScreen will block them and uiAccess is unavailable, which means the candidate window cannot float above elevated applications. Verify the download with the SHA256 published on the download page.
You need the Microsoft Visual C++ 2015–2022 Redistributable (x64). The server and settings app are 64-bit; the x86 redistributable is a separate package and does not substitute for it. If you cannot switch to the IME, the server keeps exiting, or the settings window closes immediately, install that first.
What it does
- Chinese input: full pinyin, double pinyin (Xiaohe / Ziranma / Shoudao / Microsoft), Wubi 86
- Japanese input: romaji, with hiragana, katakana and dictionary candidates; also available as a temporary mode from Chinese
- Helpcode (形码) filtering on pinyin schemes: five tables, single- and double-code
- Optional cloud candidates, and AI suggestions via DeepSeek / OpenAI / SiliconFlow / Groq
- English-Chinese glosses in the vertical candidate window
- Mixed Chinese-English input, emoji and kaomoji, a dedicated English candidate mode
- Voice input with streaming recognition and optional cleanup
- Handwriting, on-screen keyboard, floating toolbar, clipboard history
- User dictionary management, candidate frequency tuning, skins with light and dark variants
Privacy
An input method sees every keystroke, so the boundaries are stated explicitly in PRIVACY.md: which features reach the network, what each one sends, what the defaults are, and how to turn each off.
Two things worth knowing up front. Cloud candidates are on by default — the composition spelling goes to Google's input-tools service, and it is the only network feature that works without you supplying a credential. API tokens are stored in plain text in config.toml, unlike macOS and Linux which use the Keychain and Secret Service.
There is no telemetry, analytics or crash reporting of any kind.
Building and contributing
CONTRIBUTING.md has the environment, the build order and what to run before opening a pull request. Contributions do not have to be code — dictionary entries, documentation, icons and compatibility testing all count, and the recruiting page lists them by area.
Note that most issues, documentation and code comments are in Chinese. English pull requests and issues are welcome.
Licence
GPL-3.0. See LICENSE and THIRD_PARTY_NOTICES.txt.