I Built a React Native Scheduling Timeline Library — and Now It Supports Drag & Drop, Resize & Smart Overlaps
A while ago, I shared that I built a time-based scheduling timeline library for React Native. It was designed to handle complex layouts like planners, booking systems, and EPG-style interfaces.
Today, I’m excited to share a major update:
The library now supports Drag & Drop, Resize interactions, and intelligent overlap stacking.
This transforms it from a static timeline component into a fully interactive, production-ready scheduling tool.
Why I Built It
If you’ve ever tried building a scheduling UI in React Native, you probably know how tricky it gets.
Some of the challenges include:
- Precisely positioning events based on time
- Handling horizontal and vertical scrolling simultaneously
- Virtualizing large datasets for performance
- Synchronizing headers and content
- Supporting TV platforms and remote navigation
- Keeping performance smooth on tablets and lower-end devices
There wasn’t a flexible, production-ready solution that covered these needs — so I decided to build one.
What the Library Does
The timeline component allows you to:
- Render events across a horizontal time axis
- Group events by rows (resources, users, rooms, etc.)
- Scroll horizontally through time
- Scroll vertically across resources
- Handle large datasets efficiently
- Customize rendering and styling
- Automatically detect and stack overlapping events
It works across iOS, Android, and TV platforms, and is built purely in React Native.
Drag, Drop & Resize
The timeline now supports full gesture-based editing.
You can:
- 🟢 Drag events horizontally to change their time
- 🟢 Drag events vertically to move them between rows
- 🟢 Resize from the left edge to update the start time
- 🟢 Resize from the right edge to update the end time
Resize handlers are fully implemented and designed to feel natural and responsive, even during fast interactions.
Everything is calculated in real time — no hacks, no WebViews.
Smart Overlap Detection & Stacking
Scheduling systems must handle overlapping events gracefully.
The library now includes:
- Automatic overlap detection
- Intelligent stacking logic
- Dynamic recalculation during drag & resize
- Clean visual separation of colliding events
When events overlap in time, they are stacked vertically within the same row — similar to professional calendar systems.
This ensures:
- Clear visual hierarchy
- No hidden events
- Accurate collision handling
- Smooth recalculation while dragging or resizing
Handling this dynamically while maintaining performance was one of the most challenging parts of the implementation.
Under the Hood
Adding DnD, resize handlers, and overlap detection was not trivial.
Some of the technical challenges solved:
- Handling simultaneous vertical + horizontal gestures
- Real-time time recalculation during drag
- Snap-to-time logic
- Dynamic width adjustments while resizing
- Collision detection during movement
- Overlap stacking recalculation
- Preventing layout thrashing
- Maintaining high FPS during re-renders
- Avoiding unnecessary computations
Performance was a top priority from day one.
Real-World Use Cases
With drag-and-drop, resize, and overlap stacking support, the library is ready for serious scheduling scenarios:
- 📅 Booking systems
- 🏥 Medical scheduling
- 👥 Shift planning
- 📺 TV program guides (EPG)
- 🏢 Resource management tools
- 🛠 Production planning systems
- 🏫 Classroom or training schedules
It’s no longer just a timeline — it’s a fully interactive scheduler engine.
Current Status
The library is currently in beta.
I’m actively improving:
- API ergonomics
- Performance optimizations
- Edge-case handling
- Documentation
- TypeScript support
- Advanced stacking configuration options
Feedback from real-world usage is extremely valuable at this stage.
What’s Next?
Planned improvements include:
- More advanced collision rules
- Enhanced performance profiling tools
- Additional customization hooks
Final Thoughts
Building a robust scheduling timeline in React Native is much harder than it looks.
Adding smooth drag-and-drop, resize handlers, and real-time overlap stacking — while keeping performance high across devices — was a serious engineering challenge.
But now, the component feels complete.
If you’re building anything time-based in React Native, I’d love to hear your thoughts or feedback.
The journey continues
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