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Sprint 1 Changes - UX Enhancements

Branch: feature/sprint1-dragdrop-presets-shortcuts
Date: 2026-03-08
Status: Ready for Testing

🎯 Overview

This sprint focuses on making PNGer significantly more intuitive and powerful with three major feature additions plus a critical bug fix.

✅ Bug Fix: Preview File Size Calculation

Problem

  • Preview file size was not calculating correctly
  • Size didn't update when adjusting quality slider
  • Format changes weren't reflected in estimated size

Solution

  • Fixed base64 size estimation algorithm in preview.ts
  • Properly map format to MIME types (png, jpeg, webp)
  • Quality parameter now correctly applied to JPEG and WebP
  • Improved padding calculation for accurate byte estimation

Files Changed

  • frontend/src/lib/preview.ts

🆕 Feature 1: Drag & Drop Upload

What's New

  • Drag & drop zone with visual feedback
  • Hover state shows accent color
  • Dragging over triggers highlight animation
  • Clipboard paste support (Ctrl+V / Cmd+V)
  • File info displayed after upload (name + size)
  • One-click "Clear File" button

User Benefits

  • No more hunting for file picker
  • Instant image upload from screenshots (paste)
  • Modern, expected behavior
  • Faster workflow

Technical Implementation

  • dragover, dragleave, drop event handlers
  • Clipboard paste event listener
  • File type validation
  • Visual state management with isDragging flag

Files Changed

  • frontend/src/App.svelte (drag handlers + paste support)

🎯 Feature 2: Smart Presets

What's New

8 built-in presets for common use cases:

  1. 🖼️ Web Thumbnail - 300x300, WebP, 75% quality, cover
  2. 📱 Social Media - 1200x630 Open Graph, PNG, 85%, cover
  3. 👤 Profile Picture - 400x400 square, PNG, 85%, cover
  4. 📧 Email Friendly - 600px wide, JPEG, 70%, optimized
  5. ⭐ HD Quality - 1920px wide, PNG, 90%, high-res
  6. 🔍 Retina @2x - Doubles current dimensions, PNG, 85%
  7. 🔷 Icon Small - 64x64, PNG, 100%, cover
  8. 🔶 Icon Large - 256x256, PNG, 100%, cover

User Benefits

  • One-click transformations for common tasks
  • No need to remember optimal settings
  • Saves time on repetitive operations
  • Perfect for non-technical users

Technical Implementation

  • New presets.ts module with preset definitions
  • applyPreset() function with special Retina @2x logic
  • 4-column grid layout
  • Hover effects with elevation
  • Icon + name display

Files Changed

  • frontend/src/lib/presets.ts (new file)
  • frontend/src/App.svelte (preset UI + selection logic)

⌨️ Feature 3: Keyboard Shortcuts

What's New

Shortcuts Available:

  • Ctrl+V / Cmd+V - Paste image from clipboard
  • Enter - Transform & Download (when not in input)
  • Ctrl+Enter / Cmd+Enter - Transform & Download (anywhere)
  • ? - Show/hide shortcuts help
  • Esc - Close shortcuts dialog

Shortcuts Help Modal:

  • Clean, centered modal
  • Keyboard key styling (<kbd>)
  • Click outside to close
  • Fade-in animation

User Benefits

  • Power users can work without mouse
  • Faster workflow for repetitive tasks
  • Discoverable via ? key
  • Professional touch

Technical Implementation

  • Document-level keydown event listener
  • Active element detection (skip Enter if input focused)
  • Modal overlay with portal pattern
  • onMount setup and cleanup

Files Changed

  • frontend/src/App.svelte (keyboard handlers + modal)

🎨 UI/UX Improvements

Additional Polish

  • Shortcuts button in header (⌨️ icon)
  • Hint text under download button: "Press Enter to download"
  • Drop zone improvements: better empty state messaging
  • Preset icons: visual indicators for each preset type
  • Modal styling: professional overlay with backdrop blur
  • Responsive kbd tags: monospace font with shadow effect

📊 Testing Checklist

Bug Fix Validation

  • Upload image, adjust quality slider - size updates in real-time
  • Change format PNG → JPEG → WebP - size reflects format
  • Compare preview size with actual downloaded file size

Drag & Drop

  • Drag image file onto drop zone - uploads successfully
  • Drag non-image file - shows error
  • Hover during drag - shows visual feedback
  • Drop outside zone - no action

Clipboard Paste

  • Take screenshot, press Ctrl+V - pastes image
  • Copy image from browser, paste - works
  • Paste non-image - no error

Presets

  • Click "Web Thumbnail" - sets 300x300, WebP, 75%, cover
  • Click "Social Media" - sets 1200x630, PNG, 85%, cover
  • Click "Retina @2x" with 500x500 image - doubles to 1000x1000
  • All 8 presets apply correctly

Keyboard Shortcuts

  • Press ? - shows shortcuts modal
  • Press Esc in modal - closes modal
  • Press Enter with image loaded - downloads
  • Press Enter while typing in input - types Enter (doesn't download)
  • Press Ctrl+Enter anywhere - downloads
  • Press Ctrl+V - pastes from clipboard

Cross-Browser

  • Chrome/Edge - all features work
  • Firefox - all features work
  • Safari - all features work (Cmd key instead of Ctrl)

📝 Files Changed Summary

New Files

  1. frontend/src/lib/presets.ts - Preset definitions and apply logic
  2. SPRINT1_CHANGES.md - This document

Modified Files

  1. frontend/src/lib/preview.ts - Fixed size calculation bug
  2. frontend/src/App.svelte - Major update with all 3 features
  3. ROADMAP.md - Marked Phase 1.1 complete, added sprint plan

🚀 Performance Notes

  • No performance impact: All features are client-side
  • Preview debounce: Still 300ms, works great with presets
  • Modal render: Only renders when showShortcuts = true
  • Drag handlers: Lightweight event listeners
  • Preset selection: Instant application (<10ms)

🔧 Development Notes

Code Quality

  • TypeScript strict types maintained
  • Svelte reactivity patterns followed
  • Event cleanup in onMount return
  • CSS animations for smooth UX
  • Semantic HTML structure

Future Enhancements

  • Multi-file batch processing (use drag & drop foundation)
  • Custom preset saving (localStorage)
  • Preset import/export
  • More keyboard shortcuts (arrow keys for presets?)

✅ Ready for Merge

This branch is ready to merge to main once testing is complete.

Merge Command:

git checkout main
git merge feature/sprint1-dragdrop-presets-shortcuts
git push origin main

Deployment: No backend changes - just rebuild frontend Docker image.

💬 Next Sprint Suggestions

After this sprint, consider:

  1. Sprint 2A: Batch processing (multi-file upload)
  2. Sprint 2B: Additional transformations (rotate, flip, filters)
  3. Sprint 2C: Auto-optimize feature

See ROADMAP.md for full feature planning.

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