Module text_input 

Text Input Manager

Centralizes all text editing logic for contenteditable nodes.

This manager handles text input from multiple sources:

• Keyboard input (character insertion, backspace, etc.)
• IME composition (multi-character input for Asian languages)
• Accessibility actions (screen readers, voice control)
• Programmatic edits (from callbacks)

Architecture

The text input system uses a two-phase approach:

1. Record Phase: When text input occurs, record what changed (old_text + inserted_text)

   • Store in pending_changeset
   • Do NOT modify any caches yet
   • Return affected nodes so callbacks can be invoked

2. Apply Phase: After callbacks, if preventDefault was not set:

   • Compute new text using text3::edit
   • Update cursor position
   • Update text cache
   • Mark nodes dirty for re-layout

This separation allows:

• User callbacks to inspect the changeset before it’s applied
• preventDefault to cancel the edit
• Consistent behavior across keyboard/IME/A11y sources

Structs

PendingTextEdit

Information about a pending text edit that hasn’t been applied yet

TextInputManager

Text Input Manager

Enums

OptionPendingTextEdit

C-compatible Option type for PendingTextEdit

TextInputSource

Source of a text input event