diff --git a/readme.hints.md b/readme.hints.md index 044bfdc..4d1a36d 100644 --- a/readme.hints.md +++ b/readme.hints.md @@ -409,4 +409,61 @@ Created `wysiwyg.interfaces.ts` with proper typing: 4. Arrow keys handle block navigation without focus loss 5. All timing is handled via proper async/await patterns -The refactoring eliminates race conditions and timing issues that were causing focus loss and content duplication problems. \ No newline at end of file +The refactoring eliminates race conditions and timing issues that were causing focus loss and content duplication problems. + +### Programmatic Rendering Solution (2025-06-24 - Part 10) + +Fixed persistent focus loss issue by implementing fully programmatic rendering: + +#### The Problem: +- User would click in a block, type text, then press arrow keys and lose focus +- Root cause: Lit was re-rendering components when block content was mutated +- Even with shouldUpdate() preventing re-renders, parent re-evaluation caused focus loss + +#### The Solution: + +1. **Static Parent Rendering**: + - Parent component renders only once with empty editor content div + - All blocks are created and managed programmatically via DOM manipulation + - No Lit re-renders triggered by state changes + +2. **Manual Block Management**: + - `renderBlocksProgrammatically()` creates all block elements manually + - `createBlockElement()` builds block wrapper with all event handlers + - `updateBlockElement()` replaces individual blocks when needed + - No reactive properties trigger parent re-renders + +3. **Content Update Strategy**: + - During typing, content is NOT immediately synced to data model + - Auto-save delayed to 2 seconds to avoid interference + - Content synced from DOM only on blur or before save + - `syncAllBlockContent()` reads from DOM when needed + +4. **Focus Preservation**: + - Block components prevent re-renders with `shouldUpdate()` + - Parent never re-renders after initial load + - Focus remains stable during all editing operations + - Arrow key navigation works without focus loss + +5. **Implementation Details**: + ```typescript + // Parent render method - static after first render + render(): TemplateResult { + return html` +