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DOCS/IMAGE_EDITING_VERIFICATION.md

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+# Rich Editor Image Editing - Verification Guide
+
+## ✅ Implemented Features
+
+### 1. **Image Selection**
+- ✓ Click on any image in the editor to select it
+- ✓ Selected image shows a blue outline (3px solid #3182ce)
+- ✓ Blue shadow effect for visual feedback
+- ✓ Cursor changes to 'move' when hovering over selected image
+
+### 2. **Image Resizing** 🔵
+- ✓ Blue circular resize handle appears at bottom-right corner
+- ✓ Handle size: 16px with white border and blue gradient
+- ✓ Hover effect: scales to 1.3x and enhanced shadow
+- ✓ Drag the handle to resize image proportionally
+- ✓ Min width: 50px, Max width: editor width - 40px
+- ✓ Handle position updates on scroll
+- ✓ Width is tracked and displayed in toolbar
+
+### 3. **Image Alignment** 🎯
+- ✓ **Align Left**: Image positioned on left side
+- ✓ **Align Center**: Image centered horizontally
+- ✓ **Align Right**: Image positioned on right side
+- ✓ Buttons use Teal color scheme for visibility
+- ✓ Drag image left/right (>40px movement) for quick alignment
+
+### 4. **Width Control** 📏
+- ✓ Current width display in pixels
+- ✓ Manual width input field
+- ✓ "Nastavit" button to apply width
+- ✓ Press Enter in input field to apply
+- ✓ Width validation (min: 50px, max: editor width)
+- ✓ Toast notification on successful width change
+
+### 5. **Image Transformations** 🔄
+- ✓ **Rotate Left**: Rotate -90 degrees
+- ✓ **Rotate Right**: Rotate +90 degrees
+- ✓ **Flip Horizontal**: Mirror horizontally
+- ✓ **Flip Vertical**: Mirror vertically
+- ✓ Visual feedback: active buttons show solid style
+- ✓ Rotations accumulate (0°, 90°, 180°, 270°)
+
+### 6. **Image Filters** 🎨
+- ✓ **Brightness**: 0-200% (slider)
+- ✓ **Contrast**: 0-200% (slider)
+- ✓ **Saturation**: 0-200% (slider)
+- ✓ **Blur**: 0-10px with 0.5 step (slider)
+- ✓ **Quick Filters**:
+  - Grayscale toggle (black & white)
+  - Sepia toggle (vintage effect)
+- ✓ Real-time preview as you adjust
+- ✓ Filter persistence via data-filters attribute
+
+### 7. **Image Management** 🗑️
+- ✓ **Delete button**: Remove selected image
+- ✓ **Reset filters**: Restore default filter values
+- ✓ **Delete/Backspace key**: Delete selected image
+- ✓ Toast notifications for all actions
+
+### 8. **Floating Toolbar** 📱
+- ✓ Appears next to selected image
+- ✓ Intelligent positioning (right side preferred, left if no space)
+- ✓ Sections: Alignment, Width, Transformations, Filters
+- ✓ Scrollable if content exceeds 80vh
+- ✓ Custom scrollbar styling
+- ✓ Min width: 320px, Max width: 380px
+- ✓ Click outside toolbar keeps it open until X button clicked
+- ✓ Backdrop blur on close button
+
+### 9. **Image Upload & Cropping** 📸
+- ✓ "Vložit obrázek" button above editor
+- ✓ Image button in Quill toolbar
+- ✓ Crop modal with ReactCrop library
+- ✓ Quality control (1-100%, default 85%)
+- ✓ Max width control (100-3000px, default 1500px)
+- ✓ Smart canvas downscaling for performance
+- ✓ High-quality image smoothing
+
+### 10. **UX Improvements** 💫
+- ✓ Improved resize handle visibility (larger, better shadows)
+- ✓ Scroll event handling for handle positioning
+- ✓ Enhanced hover states on all controls
+- ✓ Comprehensive helper text with bullet points
+- ✓ All Czech language labels and tooltips
+- ✓ Color-coded button groups (teal for alignment, blue for transforms)
+
+## 🧪 Testing Checklist
+
+### Basic Image Operations
+- [ ] Upload an image using the "Vložit obrázek" button
+- [ ] Crop the image using the crop tool
+- [ ] Click on the inserted image to select it
+- [ ] Verify blue outline appears around selected image
+- [ ] Verify resize handle appears at bottom-right corner
+
+### Resizing Tests
+- [ ] Hover over resize handle - should scale to 1.3x
+- [ ] Drag resize handle right - image should grow
+- [ ] Drag resize handle left - image should shrink
+- [ ] Verify minimum width (50px) is enforced
+- [ ] Verify maximum width (editor width) is enforced
+- [ ] Check width updates in toolbar during resize
+
+### Alignment Tests
+- [ ] Click "Align Left" button - image moves to left
+- [ ] Click "Align Center" button - image centers
+- [ ] Click "Align Right" button - image moves to right
+- [ ] Drag image left (>40px) - should align left
+- [ ] Drag image right (>40px) - should align right
+
+### Width Control Tests
+- [ ] Type a width value (e.g., 400) in the input
+- [ ] Click "Nastavit" button - image should resize
+- [ ] Press Enter in input field - should also resize
+- [ ] Try invalid width (e.g., -100) - should show warning
+- [ ] Verify current width display is accurate
+
+### Transformation Tests
+- [ ] Click "Rotate Left" 4 times - should return to original
+- [ ] Click "Rotate Right" 4 times - should return to original
+- [ ] Toggle "Flip Horizontal" - image should mirror
+- [ ] Toggle "Flip Vertical" - image should flip
+- [ ] Combine multiple transformations
+
+### Filter Tests
+- [ ] Adjust Brightness slider (0-200%) - verify effect
+- [ ] Adjust Contrast slider (0-200%) - verify effect
+- [ ] Adjust Saturation slider (0-200%) - verify effect
+- [ ] Adjust Blur slider (0-10px) - verify effect
+- [ ] Click "Černobílá" - should toggle grayscale
+- [ ] Click "Sepia" - should toggle sepia effect
+- [ ] Apply multiple filters simultaneously
+- [ ] Click "Reset filters" - all should return to defaults
+
+### Deletion Tests
+- [ ] Select image and click delete button
+- [ ] Select image and press Delete key
+- [ ] Select image and press Backspace key
+- [ ] Verify toast notification appears
+
+### Persistence Tests
+- [ ] Apply filters to an image
+- [ ] Deselect and reselect the image
+- [ ] Verify filters are still applied
+- [ ] Save the article and reload
+- [ ] Verify filters persist after reload
+
+### Toolbar Tests
+- [ ] Verify toolbar appears to the right of image (if space)
+- [ ] Verify toolbar appears to the left if no space on right
+- [ ] Scroll the editor - verify toolbar stays positioned
+- [ ] Verify toolbar is scrollable if tall
+- [ ] Click X button to close toolbar
+
+### Edge Cases
+- [ ] Select image, scroll editor - verify handle follows
+- [ ] Upload very large image - verify it's constrained
+- [ ] Upload very small image - verify it can be resized
+- [ ] Try all operations with multiple images in editor
+- [ ] Test in narrow browser window
+- [ ] Test in wide browser window
+
+## 📊 Technical Details
+
+### Key Components Modified
+- **CustomRichEditor.tsx**: Main rich editor component
+  - Added state for imageWidth and manualWidth
+  - Enhanced resize handle with better positioning
+  - Added alignment functions
+  - Added manual width input handler
+  - Improved scroll event handling
+  - Enhanced toolbar UI with new sections
+
+### New Functions
+1. `alignImage(alignment: 'left' | 'center' | 'right')` - Aligns selected image
+2. `applyManualWidth()` - Applies manually entered width value
+3. `handleScroll()` - Updates resize handle position on scroll
+
+### Enhanced Functions
+1. `createResizeHandle()` - Better styling, scroll-aware positioning
+2. `selectImage()` - Loads current width, resets filters properly
+3. `deselectImage()` - Clears width state
+4. `handleMouseDown()` - Improved drag threshold (40px vs 30px)
+
+### CSS Improvements
+- Enhanced resize handle visibility (16px, better shadows)
+- Custom scrollbar for floating toolbar
+- Improved hover states
+
+### Filter Persistence
+- Filters stored in `data-filters` attribute as JSON
+- Loaded when image is selected
+- Preserved through all operations
+- Sanitized by DOMPurify with proper configuration
+
+## 🎯 Expected Behavior Summary
+
+**When you click an image:**
+1. Blue outline appears (3px solid)
+2. Blue shadow effect added
+3. Resize handle appears at bottom-right (blue circle with white border)
+4. Floating toolbar opens next to image
+5. Current width loads in toolbar
+6. Any saved filters are restored
+
+**When you resize:**
+1. Drag blue handle to desired size
+2. Width updates in real-time
+3. Width displayed in toolbar updates
+4. Image maintains aspect ratio
+5. Handle follows image on scroll
+
+**When you align:**
+1. Click alignment button (left/center/right)
+2. Image repositions immediately
+3. Toast notification confirms action
+4. OR drag image left/right >40px for quick alignment
+
+**When you filter:**
+1. Adjust sliders or click quick filters
+2. Image updates in real-time
+3. Filter data saved to image
+4. Filters persist when reselecting image
+
+**When you delete:**
+1. Click delete button or press Delete/Backspace
+2. Image removed from editor
+3. Toast notification shows confirmation
+4. Toolbar closes
+
+## 🚀 Performance Notes
+
+- **Image Upload**: Optimized with quality and max-width controls
+- **Canvas Rendering**: High-quality smoothing enabled
+- **Real-time Filters**: CSS filters (hardware accelerated)
+- **Resize Handle**: Only updates on relevant events
+- **Toolbar**: Scrollable for performance with many controls
+
+## 📝 Known Limitations
+
+1. **Drag Movement**: Currently changes alignment, not free positioning
+2. **Filter Presets**: Only grayscale and sepia quick filters
+3. **Undo/Redo**: Standard browser undo may not work for all operations
+4. **Mobile**: Touch events not specifically optimized (works but not ideal)
+
+## ✨ Recommended Improvements for Future
+
+1. Add more filter presets (vintage, cold, warm, etc.)
+2. Add free-form positioning with drag
+3. Add image border/padding controls
+4. Add image link functionality
+5. Add alt text editing in toolbar
+6. Add image caption support
+7. Optimize for touch/mobile devices
+8. Add keyboard shortcuts for common operations
+9. Add image history/undo specifically for filters
+
+---
+
+**Version**: Enhanced Image Editing v2.0  
+**Date**: October 19, 2025  
+**Status**: ✅ Ready for Testing