Update README to reflect split-based editor and multi-monitor support

- Replace drawing instructions with split-based workflow
- Add multi-monitor support section
- Update keyboard shortcuts with editor controls
- Mark completed features in Future Enhancements
- Add real-time dimension display feature
- Update contributing section

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

README.md

@@ -4,11 +4,13 @@ A window tiling manager extension for Linux Mint's Cinnamon Desktop, inspired by
 
 ## Features
 
+- **Split-Based Zone Editor**: Create layouts by splitting zones horizontally or vertically - intuitive tiling interface!
+- **Multi-Monitor Support**: Independent zone configurations for each monitor
 - **Multiple Zone Layouts**: Pre-configured layouts including 2x2 grid, 3 columns, and focus layouts
-- **Graphical Zone Editor**: Draw custom zones visually with your mouse - no code editing required!
+- **Real-Time Dimensions**: See pixel and percentage dimensions in each zone
 - **Visual Overlay**: See your zones while dragging windows (hold Shift)
 - **Keyboard Shortcuts**: Quick snap to zones using hotkeys
-- **Layout Cycling**: Switch between different zone layouts on the fly
+- **Persistent Storage**: Custom layouts saved per-monitor with automatic migration
 
 ## Installation
 
@@ -28,29 +30,41 @@ A window tiling manager extension for Linux Mint's Cinnamon Desktop, inspired by
 
 ### Keyboard Shortcuts
 
+**Global Shortcuts:**
 - **Super + Z**: Toggle zone overlay (show/hide zones)
 - **Super + Shift + Z**: Cycle through different layouts
-- **Super + Shift + E**: Open graphical zone editor
+- **Super + Shift + E**: Open zone editor
 - **Super + Ctrl + 1-9**: Snap focused window to zone 1-9
 
+**Zone Editor Shortcuts:**
+- **H**: Split selected zone horizontally (creates top/bottom)
+- **V**: Split selected zone vertically (creates left/right)
+- **Delete**: Remove selected zone
+- **Ctrl + S**: Save layout
+- **Escape**: Cancel and close editor
+
 ### Mouse Usage
 
 1. Hold **Shift** while dragging a window to see the zone overlay
 2. Drop the window over a zone to snap it there
 3. Release Shift or move outside zones to cancel
 
-### Graphical Zone Editor
+### Split-Based Zone Editor
 
-Create custom layouts visually by drawing zones with your mouse:
+Create custom layouts by progressively splitting zones:
 
 1. Press **Super + Shift + E** to open the zone editor
-2. **Click and drag** to draw rectangular zones
-3. Draw as many zones as you need
-4. **Ctrl + S** to save your custom layout
-5. **Ctrl + C** or **Escape** to cancel
-6. **Delete/Backspace** to remove the last zone
+2. Select which monitor to edit (if you have multiple monitors)
+3. Choose to create a new layout or edit an existing one
+4. Editor starts with **one full-screen zone** (highlighted in yellow)
+5. **Click** a zone to select it
+6. Press **H** to split horizontally (top/bottom) or **V** to split vertically (left/right)
+7. **Drag dividers** between zones to adjust their positions
+8. Press **Delete** to remove the selected zone
+9. **Ctrl + S** to save your custom layout
+10. **Escape** to cancel
 
-Your custom layout will be added to the layout rotation and can be accessed with Super + Shift + Z.
+Each zone displays its dimensions in pixels and percentages in real-time. Your custom layout will be saved per-monitor and can be accessed with Super + Shift + Z.
 
 ## Available Layouts
 
@@ -60,12 +74,14 @@ Your custom layout will be added to the layout rotation and can be accessed with
 
 ## Customization
 
-### Easy Way: Use the Graphical Editor
+### Easy Way: Use the Split-Based Editor
 
 1. Press **Super + Shift + E** to open the zone editor
-2. Draw zones by clicking and dragging
-3. Press **Ctrl + S** to save your custom layout
-4. Your layout is immediately available in the layout rotation!
+2. Select your monitor (if you have multiple)
+3. Split zones using **H** (horizontal) and **V** (vertical)
+4. Adjust dividers by dragging them
+5. Press **Ctrl + S** to save your custom layout
+6. Your layout is immediately available and saved per-monitor!
 
 ### Advanced Way: Edit the Code
 
@@ -89,6 +105,22 @@ Zone coordinates are relative (0.0 to 1.0):
 - `width`: Zone width as fraction of screen width
 - `height`: Zone height as fraction of screen height
 
+## Multi-Monitor Support
+
+GridSnap fully supports multiple monitors with independent configurations:
+
+- **Per-Monitor Layouts**: Each monitor can have its own set of custom layouts
+- **Monitor Selector**: Choose which monitor to edit when opening the zone editor
+- **Automatic Detection**: Window snapping automatically uses the correct monitor's zones
+- **Keyboard Shortcuts**: Work on any monitor - snaps to zones on the monitor where the window is located
+- **Settings Panel**: Manage layouts per-monitor with a dropdown selector
+- **Storage Migration**: Existing layouts automatically migrate to the primary monitor
+
+When you open the zone editor, you'll be prompted to select which monitor to configure. Each monitor maintains its own:
+- Current active layout
+- Custom layouts
+- Zone configurations
+
 ## Troubleshooting
 
 ### Extension won't load
@@ -132,21 +164,24 @@ tail -f ~/.cinnamon/glass.log
 ## Future Enhancements
 
 - [x] Custom layout editor GUI
-- [ ] Per-monitor zone configurations
-- [ ] Save custom layouts permanently to file
-- [ ] Edit existing custom layouts in the graphical editor
+- [x] Per-monitor zone configurations
+- [x] Save custom layouts permanently to file
+- [x] Edit existing custom layouts in the graphical editor
+- [x] Animation effects
+- [x] Settings panel (zone appearance, toggles, layout management)
 - [ ] Zone layout import/export
 - [ ] More pre-configured layouts
-- [ ] Animation effects
-- [ ] Settings panel for keybinding customization
+- [ ] High-DPI display support
+- [ ] Keybinding customization in settings panel
 
 ## Contributing
 
 Feel free to fork and submit pull requests! Areas that could use help:
 - Additional layout presets
-- UI improvements for the overlay
-- Settings GUI implementation
-- Multi-monitor support improvements
+- High-DPI display support and testing
+- Zone layout import/export functionality
+- UI improvements and animations
+- Performance optimizations
 
 ## License