force_english_ime

中文文档

A Windows plugin for Flutter that forces English input mode by completely disabling IME. Prevents users from switching input methods via shortcuts like Shift or Ctrl+Space.

Features

✅ Complete IME Disable - Uses ImmAssociateContext to completely disable IME
✅ Automatic State Management - Auto-save and restore IME state
✅ Accurate Detection - Precise input mode detection using ImmGetConversionStatus
✅ Zero Dependencies - Only uses Windows IMM API
✅ Easy Integration - Simple API with Focus widget support

Platform Support

Platform	Support
Windows	✅
macOS	❌
Linux	❌
Android	❌
iOS	❌

Installation

Add to pubspec.yaml:

dependencies:
  force_english_ime: ^0.0.2

Then run:

flutter pub get

Quick Start

Basic Usage

import 'package:force_english_ime/force_english_ime.dart';

final _imePlugin = ForceEnglishIme();

// Check if English IME
bool isEnglish = await _imePlugin.isEnglishIme();

// Force English input
await _imePlugin.forceEnglishInput();

// Restore original IME
await _imePlugin.restoreOriginalIme();

Use with TextField

class EmailInput extends StatefulWidget {
  @override
  State<EmailInput> createState() => _EmailInputState();
}

class _EmailInputState extends State<EmailInput> {
  final _imePlugin = ForceEnglishIme();
  final _controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Focus(
      onFocusChange: (hasFocus) {
        if (hasFocus) {
          _imePlugin.forceEnglishInput();
        } else {
          _imePlugin.restoreOriginalIme();
        }
      },
      child: TextField(
        controller: _controller,
        decoration: const InputDecoration(
          labelText: 'Email',
          hintText: '[email protected]',
        ),
      ),
    );
  }
}

API Reference

Methods

`Future<bool> isEnglishIme()`

Check if current IME is in English mode.

Returns: true if in English mode, false otherwise.

`Future<bool> forceEnglishInput()`

Force English input by completely disabling IME.

Returns: true if successful, false otherwise.

`Future<bool> restoreOriginalIme()`

Restore the original IME state.

Returns: true if successful, false otherwise.

Use Cases

📧 Email input
👤 Username input
🔗 URL input
💻 Code editor
🔑 API key input
And more...

How It Works

This plugin uses Windows IMM (Input Method Manager) API:

ImmAssociateContext(hwnd, NULL) - Completely disables IME
ImmGetConversionStatus() - Detects input mode
GetFocus() - Gets current focused control

When IME is disabled, users cannot switch input methods via any shortcuts (Shift, Ctrl+Space, etc.).

Examples

Check out the example directory for a complete demo app.

Requirements

Flutter SDK: ≥ 3.3.0
Dart SDK: ≥ 3.10.4
Windows 10 or higher recommended

License

MIT License - see LICENSE file for details.

Contributing

Issues and Pull Requests are welcome!

Links

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