feat: Implement dynamic style preview buttons
- Add JavaScript-based style copying from original elements to toolbar buttons - Use getComputedStyle() to dynamically apply color, font-weight, text-decoration, text-transform - Preserve button clickability with protected backgrounds and hover states - Support any CSS framework/custom styles without hardcoded mappings - Add comprehensive documentation to TODO.md for future enhancements Examples: - 'Emphasis' button now shows red bold text (from .emph class) - 'Highlight' button displays with style preview while remaining clickable - 'Brand' button demonstrates text-transform and color changes This provides intuitive visual feedback so users immediately understand what each formatting button will do to their content.
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TODO.md
122
TODO.md
@@ -535,3 +535,125 @@ The HTTP server has been successfully implemented and is production-ready:
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**Priority**: Low - implement after core functionality is stable and enterprise customers request advanced permissions.
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**Design Principle**: Keep simple `.insertr-gate` as default, add optional complexity only when needed.
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## 🎨 **Style Preview Enhancement System** (Dec 2024)
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### **✅ IMPLEMENTED: Basic Style Button Previews**
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**Goal**: Make formatting buttons visually preview the styles they represent.
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**Current Implementation**:
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- ✅ **Dynamic Style Copying** - JavaScript reads computed styles from original elements
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- ✅ **Selective Property Application** - Copies color, font-weight, text-decoration, text-transform
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- ✅ **Button Structure Preservation** - Maintains clickable button appearance with backgrounds/borders
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- ✅ **Cross-Platform Compatibility** - Uses `window.getComputedStyle()` for universal support
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**Example Results**:
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- "Emphasis" button displays with red bold text (from `.emph { color: #dc2626; font-weight: 700; }`)
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- "Highlight" button shows preview styling while remaining clickable
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- "Brand" button demonstrates text-transform and color changes
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### **🔄 Future Style Preview Enhancements**
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#### **🎯 Priority 1: Enhanced Style Support**
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- [ ] **Background Colors** - Safe background preview with contrast protection
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- [ ] **Border Styles** - Preview border styles while maintaining button structure
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- [ ] **Typography Styles** - Font-family, font-size adjustments with readability limits
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- [ ] **Advanced CSS Properties** - Text-shadow, letter-spacing, line-height previews
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#### **🎯 Priority 2: Interactive Previews**
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- [ ] **Hover State Previews** - Show hover effects in button previews
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- [ ] **Animation Previews** - Preview CSS transitions and animations safely
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- [ ] **Responsive Previews** - Show how styles adapt across screen sizes
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- [ ] **Nested Style Previews** - Handle complex nested styling scenarios
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#### **🎯 Priority 3: Advanced Preview Features**
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- [ ] **Custom Style Creation** - Visual style picker with live preview
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- [ ] **Style Inheritance Display** - Show which properties come from which classes
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- [ ] **Accessibility Validation** - Ensure previews meet contrast and readability standards
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- [ ] **Performance Optimization** - Cache computed styles, minimize recomputation
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### **🔧 Technical Implementation Details**
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**Current Approach** (JavaScript-based style copying):
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```javascript
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const computedStyle = window.getComputedStyle(styleInfo.element);
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if (computedStyle.color && computedStyle.color !== 'rgb(0, 0, 0)') {
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button.style.setProperty('color', computedStyle.color, 'important');
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}
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```
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**Benefits**:
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- ✅ Works with any CSS framework or custom styles
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- ✅ No hardcoded style mappings required
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- ✅ Automatically adapts to theme changes
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- ✅ Handles complex CSS specificity scenarios
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**Limitations**:
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- ⚠️ Limited to properties safe for button elements
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- ⚠️ Background colors skipped to maintain readability
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- ⚠️ Some complex styles may not preview accurately
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- ⚠️ Performance impact on large style sets
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### **🎨 Design Considerations**
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**Readability vs Accuracy Trade-offs**:
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- **Button Backgrounds**: Always use safe background to ensure clickability
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- **Text Contrast**: Ensure sufficient contrast between text and button background
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- **Property Selection**: Only preview properties that don't break button functionality
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- **Fallback Handling**: Graceful degradation when style copying fails
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**User Experience Principles**:
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- **Immediate Recognition**: Users should instantly understand what each button does
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- **Consistent Interaction**: Buttons should always feel clickable regardless of style
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- **Visual Hierarchy**: Style previews shouldn't overpower the editor interface
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- **Accessibility**: Maintain WCAG compliance for all preview combinations
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### **🧪 Testing Strategy for Style Previews**
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**Cross-Browser Compatibility**:
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- Test `getComputedStyle()` behavior across major browsers
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- Validate CSS custom property support and inheritance
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- Check for inconsistencies in color space handling
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**Edge Case Handling**:
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- Very long class names or deeply nested selectors
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- Conflicting CSS properties from multiple stylesheets
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- High contrast or accessibility mode compatibility
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- Performance with large numbers of detected styles
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**Real-World Style Testing**:
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- Test with popular CSS frameworks (Tailwind, Bootstrap, Bulma)
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- Validate with complex design systems and component libraries
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- Check compatibility with CSS-in-JS solutions
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- Test with user-defined custom properties and themes
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### **📊 Future Metrics and Analytics**
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**Style Preview Usage Analytics**:
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- Track which style previews are most commonly used
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- Measure user engagement with preview vs non-preview buttons
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- Identify styles that cause preview rendering issues
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- Monitor performance impact of style computation
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**User Experience Improvements**:
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- A/B test preview accuracy vs simplified representations
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- Test user comprehension of style previews vs text labels
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- Measure editing efficiency with vs without previews
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- Gather feedback on preview helpfulness for different user types
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### **Integration with Future Features**
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**Style Management System**:
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- Style preview integration with custom style creation tools
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- Preview integration with theme switching and dark mode
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- Connection to style documentation and design system integration
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- Preview role in collaborative editing and style consistency
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**Performance Optimization**:
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- Style preview caching for frequently used styles
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- Lazy loading of preview computation for off-screen elements
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- Optimization for mobile devices and slower browsers
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- Integration with build-time style optimization
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**Note**: Current implementation provides solid foundation for all future enhancements while maintaining the zero-configuration philosophy.
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