feat: add collapsible resizable navigation

netbox_utilities/navigation_helpers.py

@@ -1,5 +1,32 @@
 from netbox.navigation.menu import get_menus
 
+SIDEBAR_WIDTH_MIN = 216
+SIDEBAR_WIDTH_MAX = 408
+SIDEBAR_WIDTH_STEP = 24
+SIDEBAR_WIDTH_DEFAULT = 288
+
+
+def normalize_sidebar_width(value):
+    try:
+        width = int(value)
+    except (TypeError, ValueError):
+        return SIDEBAR_WIDTH_DEFAULT
+
+    width = min(SIDEBAR_WIDTH_MAX, max(SIDEBAR_WIDTH_MIN, width))
+    steps = (width - SIDEBAR_WIDTH_MIN + SIDEBAR_WIDTH_STEP // 2) // SIDEBAR_WIDTH_STEP
+    return SIDEBAR_WIDTH_MIN + steps * SIDEBAR_WIDTH_STEP
+
+
+def update_sidebar_layout(collapsed, width, action):
+    width = normalize_sidebar_width(width)
+    if action == "toggle":
+        return not collapsed, width
+    if action == "smaller":
+        return collapsed, max(SIDEBAR_WIDTH_MIN, width - SIDEBAR_WIDTH_STEP)
+    if action == "larger":
+        return collapsed, min(SIDEBAR_WIDTH_MAX, width + SIDEBAR_WIDTH_STEP)
+    raise ValueError("Unbekannte Navigationsaktion.")
+
 
 def _permitted_menu_items(menu, user):
     for group in menu.groups: