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IME Support

Rio terminal provides comprehensive Input Method Editor (IME) support for multilingual text input, with intelligent cursor positioning for an enhanced user experience.

Features​

IME Cursor Positioning​

Rio automatically positions IME input popups precisely at the terminal cursor location, providing a seamless input experience for:

  • CJK Languages: Chinese, Japanese, Korean input methods
  • Emoji Input: System emoji picker and character viewer
  • Special Characters: Unicode character input dialogs
  • Accent Input: Dead key combinations and accent menus

Automatic Position Updates​

The IME cursor position is automatically updated whenever the cursor moves through:

  • Keyboard input and navigation
  • Mouse clicks and selection
  • Vi mode cursor movements
  • Terminal escape sequences
  • Scrolling and window operations

Platform Support​

IME cursor positioning is supported on:

  • macOS: Full support with native Input Method Kit integration
  • Linux: Support via X11 and Wayland input methods
  • Windows: Support via Windows IME framework

Configuration​

IME cursor positioning can be configured in your config.toml:

[keyboard]
ime-cursor-positioning = true  # Enable IME cursor positioning (default)

Options​

  • true (default): IME popups appear at the cursor position
  • false: Use system default IME positioning behavior

Benefits​

Enhanced User Experience​

  • Precise Positioning: IME popups appear exactly where you're typing
  • Visual Continuity: No disconnect between cursor and input location
  • Reduced Eye Movement: Input context stays in your field of view

Multilingual Support​

  • CJK Input: Improved experience for Chinese, Japanese, Korean
  • Emoji Integration: Seamless emoji picker positioning
  • Unicode Support: Better handling of special character input

Performance Optimized​

  • Smart Throttling: Only updates when cursor position changes significantly
  • Validation: Prevents invalid coordinates that could cause system errors
  • Efficient Updates: Minimal overhead with render-based positioning

Technical Details​

Implementation​

Rio uses a render-based approach for IME cursor positioning:

  1. Coordinate Calculation: Converts terminal grid position to pixel coordinates
  2. Validation: Ensures coordinates are valid before updating
  3. Throttling: Prevents unnecessary updates for minimal position changes
  4. Platform Integration: Uses native IME APIs for each operating system

Error Handling​

  • Validates cell dimensions and coordinates
  • Graceful fallback for invalid positions
  • Comprehensive logging for debugging
  • Safe defaults when positioning fails

Troubleshooting​

IME Not Positioning Correctly​

  1. Ensure ime-cursor-positioning = true in your config
  2. Check that your system IME is properly configured
  3. Verify Rio has necessary permissions for input method access

Performance Issues​

If you experience performance issues with IME positioning:

[keyboard]
ime-cursor-positioning = false  # Disable to use system default

Platform-Specific Notes​

macOS: Requires Input Method Kit permissions Linux: May require specific input method configuration Windows: Works with Windows IME framework