feat: support named switchable layouts

README.md

@@ -79,15 +79,17 @@ Here is a complete two-column configuration:
 version: 1
 gap: 8
 shift_drag: true
+active_layout: columns
 
 overlay:
   enabled: true
   color: "#00AEEF"
   opacity: 90
-  border_width: 3
+  border_width: 10
 
 layouts:
-  - monitor: "*"
+  - name: columns
+    monitor: "*"
     zones:
       - name: left
         x: 0
@@ -100,6 +102,15 @@ layouts:
         width: 50
         height: 100
 
+  - name: fullscreen
+    monitor: "*"
+    zones:
+      - name: full
+        x: 0
+        y: 0
+        width: 100
+        height: 100
+
 excluded_apps:
   - mstsc.exe
 
@@ -126,6 +137,7 @@ use.
 | `version` | Configuration format. This must currently be `1`. |
 | `gap` | Inward spacing, in pixels, applied to every edge of every zone. Valid range: `0`–`500`. |
 | `shift_drag` | Enables or disables mouse snapping when Shift is held at the end of a drag. |
+| `active_layout` | Name of the layout currently used for snapping and the overlay. |
 | `overlay` | Controls the transparent zone guide shown during Shift-dragging. |
 | `layouts` | One or more monitor layouts containing zones. |
 | `excluded_apps` | Applications FancyWin must not move. May be empty. |
@@ -144,7 +156,7 @@ overlay:
   enabled: true
   color: "#00AEEF"
   opacity: 90
-  border_width: 3
+  border_width: 10
 ```
 
 - `enabled` turns the guide on or off.
@@ -182,7 +194,32 @@ For example, the bottom-right quarter is:
 Zones may overlap. If the pointer is inside more than one zone, the first
 matching zone listed in the file is selected.
 
-### Monitor-specific layouts
+### Named layouts and monitor-specific variants
+
+Every entry under `layouts` has a `name`. Set `active_layout` to that name to
+choose which layout FancyWin uses:
+
+```yaml
+active_layout: focus
+
+layouts:
+  - name: focus
+    monitor: "*"
+    zones:
+      - { name: left, x: 0, y: 0, width: 25, height: 100 }
+      - { name: middle, x: 25, y: 0, width: 50, height: 100 }
+      - { name: right, x: 75, y: 0, width: 25, height: 100 }
+
+  - name: equal-thirds
+    monitor: "*"
+    zones:
+      - { name: left, x: 0, y: 0, width: 33.333, height: 100 }
+      - { name: middle, x: 33.333, y: 0, width: 33.334, height: 100 }
+      - { name: right, x: 66.667, y: 0, width: 33.333, height: 100 }
+```
+
+Changing `active_layout` to `equal-thirds` is applied automatically within
+about two seconds; FancyWin does not need to be restarted.
 
 Use `monitor: "*"` as the fallback layout for every display that does not have
 a specific entry. At startup, FancyWin prints detected device names such as
@@ -192,18 +229,25 @@ A specific monitor layout can override the fallback:
 
 ```yaml
 layouts:
-  - monitor: "*"
+  - name: focus
+    monitor: "*"
     zones:
       - { name: left,  x: 0,  y: 0, width: 50, height: 100 }
       - { name: right, x: 50, y: 0, width: 50, height: 100 }
 
-  - monitor: '\\.\DISPLAY2'
+  - name: focus
+    monitor: '\\.\DISPLAY2'
     zones:
       - { name: main, x: 0,  y: 0, width: 70, height: 100 }
       - { name: side, x: 70, y: 0, width: 30, height: 100 }
 ```
 
-Only one layout may be declared for each monitor name.
+The monitor-specific entry must use the same layout name as its fallback. Only
+one entry may be declared for each combination of layout name and monitor name.
+Names and monitor matching are not case-sensitive.
+
+Older configurations containing no `active_layout` and no layout names are
+loaded as one backwards-compatible layout named `default`.
 
 ### Hotkeys