I can add and show tabs with lazy loading and content management

src/app.py

@@ -1,7 +1,7 @@
-import logging
+import logging.config
 
+import yaml
 from fasthtml import serve
-from fasthtml.components import *
 
 from myfasthtml.controls.Layout import Layout
 from myfasthtml.controls.TabsManager import TabsManager
@@ -10,15 +10,16 @@ from myfasthtml.core.commands import Command
 from myfasthtml.core.instances import InstancesManager
 from myfasthtml.myfastapp import create_app
 
-logging.basicConfig(
+with open('logging.yaml', 'r') as f:
-  level=logging.DEBUG,  # Set logging level to DEBUG
+  config = yaml.safe_load(f)
-  format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',  # Log format
+
-  datefmt='%Y-%m-%d %H:%M:%S',  # Timestamp format
+# At the top of your script or module
-)
+logging.config.dictConfig(config)
 
 app, rt = create_app(protect_routes=True,
                      mount_auth_app=True,
                      pico=False,
+                     vis=True,
                      title="MyFastHtml",
                      live=True,
                      base_url="http://localhost:5003")
@@ -28,9 +29,6 @@ app, rt = create_app(protect_routes=True,
 def index(session):
   layout = InstancesManager.get(session, Ids.Layout, Layout, "Testing Layout")
   layout.set_footer("Goodbye World")
-  for i in range(50):
-    layout.left_drawer.add(Div(f"Left Drawer Item {i}"))
-    layout.right_drawer.add(Div(f"Left Drawer Item {i}"))
   
   tabs_manager = TabsManager(session, _id="main")
   

src/logging.yaml

@@ -0,0 +1,54 @@
+version: 1
+disable_existing_loggers: False
+
+formatters:
+  default:
+    format: "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+
+handlers:
+  console:
+    class: logging.StreamHandler
+    formatter: default
+
+root:
+  level: DEBUG
+  handlers: [console]
+
+
+loggers:
+  # Explicit logger configuration (example)
+  multipart.multipart:
+    level: INFO
+    handlers: [console]
+    propagate: False
+  python_multipart.multipart:
+    level: INFO
+    handlers: [ console ]
+    propagate: False
+  httpcore:
+    level: ERROR
+    handlers: [ console ]
+    propagate: False
+  httpx:
+    level: INFO
+    handlers: [ console ]
+    propagate: False
+  watchfiles.main:
+    level: ERROR
+    handlers: [console]
+    propagate: False
+
+  dbengine.dbengine:
+    level: ERROR
+    handlers: [console]
+    propagate: False
+
+  passlib.registry:
+    level: ERROR
+    handlers: [console]
+    propagate: False
+
+  socket.socket:
+    level: ERROR
+    handlers: [ console ]
+    propagate: False

src/myfasthtml/assets/myfasthtml.css

@@ -380,6 +380,16 @@
 
 /* Tab Content Area */
 .mf-tab-content {
+    flex: 1;
+    overflow: auto;
+    height: 100%;
+    border: 2px solid black;
+    /*background-color: var(--color-base-100);*/
+    /*padding: 1rem;*/
+    /*border-top: 1px solid var(--color-border-primary);*/
+}
+
+.mf-tab-content-wrapper {
     flex: 1;
     overflow: auto;
     background-color: var(--color-base-100);
@@ -396,3 +406,8 @@
     @apply text-base-content/50;
     font-style: italic;
 }
+
+.mf-vis {
+    width: 100%;
+    height: 100%;
+}

src/myfasthtml/assets/myfasthtml.js

@@ -207,3 +207,63 @@ function initBoundaries(elementId, updateUrl) {
     observer.observe(container.parentNode, {childList: true});
   }
 }
+
+/**
+ * Updates the tabs display by showing the active tab content and scrolling to make it visible.
+ * This function is called when switching between tabs to update both the content visibility
+ * and the tab button states.
+ *
+ * @param {string} controllerId - The ID of the tabs controller element (format: "{managerId}-content-controller")
+ */
+function updateTabs(controllerId) {
+  const controller = document.getElementById(controllerId);
+  if (!controller) {
+    console.warn(`Controller ${controllerId} not found`);
+    return;
+  }
+
+  const activeTabId = controller.dataset.activeTab;
+  if (!activeTabId) {
+    console.warn('No active tab ID found');
+    return;
+  }
+
+  // Extract manager ID from controller ID (remove '-content-controller' suffix)
+  const managerId = controllerId.replace('-content-controller', '');
+
+  // Hide all tab contents for this manager
+  const contentWrapper = document.getElementById(`${managerId}-content-wrapper`);
+  if (contentWrapper) {
+    contentWrapper.querySelectorAll('.mf-tab-content').forEach(content => {
+      content.classList.add('hidden');
+    });
+
+    // Show the active tab content
+    const activeContent = document.getElementById(`${managerId}-${activeTabId}-content`);
+    if (activeContent) {
+      activeContent.classList.remove('hidden');
+    }
+  }
+
+  // Update active tab button styling
+  const header = document.getElementById(`${managerId}-header`);
+  if (header) {
+    // Remove active class from all tabs
+    header.querySelectorAll('.mf-tab-button').forEach(btn => {
+      btn.classList.remove('mf-tab-active');
+    });
+
+    // Add active class to current tab
+    const activeButton = header.querySelector(`[data-tab-id="${activeTabId}"]`);
+    if (activeButton) {
+      activeButton.classList.add('mf-tab-active');
+
+      // Scroll to make active tab visible if needed
+      activeButton.scrollIntoView({
+        behavior: 'smooth',
+        block: 'nearest',
+        inline: 'nearest'
+      });
+    }
+  }
+}

src/myfasthtml/controls/TabsManager.py

@@ -1,17 +1,39 @@
+import logging
 import uuid
 from dataclasses import dataclass
 from typing import Any
 
 from fasthtml.common import Div, Span
+from fasthtml.xtend import Script
 
 from myfasthtml.controls.BaseCommands import BaseCommands
+from myfasthtml.controls.VisNetwork import VisNetwork
 from myfasthtml.controls.helpers import Ids, mk
 from myfasthtml.core.commands import Command
 from myfasthtml.core.dbmanager import DbObject
 from myfasthtml.core.instances import MultipleInstance, BaseInstance
+from myfasthtml.core.instances_helper import InstancesHelper
 from myfasthtml.icons.fluent_p1 import tabs24_regular
 from myfasthtml.icons.fluent_p3 import dismiss_circle16_regular, tab_add24_regular
 
+logger = logging.getLogger("TabsManager")
+
+vis_nodes = [
+    {"id": 1, "label": "Node 1"},
+    {"id": 2, "label": "Node 2"},
+    {"id": 3, "label": "Node 3"},
+    {"id": 4, "label": "Node 4"},
+    {"id": 5, "label": "Node 5"}
+]
+
+vis_edges = [
+    {"from": 1, "to": 3},
+    {"from": 1, "to": 2},
+    {"from": 2, "to": 4},
+    {"from": 2, "to": 5},
+    {"from": 3, "to": 3}
+]
+
 
 @dataclass
 class Boundaries:
@@ -37,7 +59,7 @@ class Commands(BaseCommands):
   def show_tab(self, tab_id):
     return Command(f"{self._prefix}ShowTab",
                    "Activate or show a specific tab",
-                   self._owner.show_tab, tab_id).htmx(target=f"#{self._id}", swap="outerHTML")
+                   self._owner.show_tab, tab_id).htmx(target=f"#{self._id}-content-controller", swap="outerHTML")
   
   def close_tab(self, tab_id):
     return Command(f"{self._prefix}CloseTab",
@@ -45,9 +67,10 @@ class Commands(BaseCommands):
                    self._owner.close_tab, tab_id).htmx(target=f"#{self._id}", swap="outerHTML")
   
   def add_tab(self, label: str, component: Any, auto_increment=False):
-    return Command(f"{self._prefix}AddTab",
+    return (Command(f"{self._prefix}AddTab",
                     "Add a new tab",
-                   self._owner.on_new_tab, label, component, auto_increment).htmx(target=f"#{self._id}")
+                    self._owner.on_new_tab, label, component, auto_increment).
+            htmx(target=f"#{self._id}-content-controller"))
   
   def update_boundaries(self):
     return Command(f"{self._prefix}UpdateBoundaries",
@@ -73,107 +96,23 @@ class TabsManager(MultipleInstance):
     self._state = TabsManagerState(self)
     self.commands = Commands(self)
     self._boundaries = Boundaries()
+    logger.debug(f"TabsManager created with id: {self._id}")
+    logger.debug(f"  tabs       : {self._get_ordered_tabs()}")
+    logger.debug(f"  active tab : {self._state.active_tab}")
   
   def get_state(self):
     return self._state
   
-  def _estimate_tab_width(self, label: str) -> int:
+  def _get_ordered_tabs(self):
-    """
+    return {tab_id: self._state.tabs.get(tab_id, None) for tab_id in self._state.tabs_order}
-    Estimate the width of a tab based on its label.
   
-    Args:
+  def _get_tab_content(self, tab_id):
-        label: Tab label text
+    if tab_id not in self._state.tabs:
-
+      return None
-    Returns:
+    tab_config = self._state.tabs[tab_id]
-        Estimated width in pixels
+    if tab_config["component_type"] is None:
-    """
+      return None
-    char_width = len(label) * self.TAB_CHAR_WIDTH
+    return InstancesHelper.dynamic_get(self._session, tab_config["component_type"], tab_config["component_id"])
-    total_width = char_width + self.TAB_PADDING
-    return max(total_width, self.TAB_MIN_WIDTH)
-  
-  def _calculate_visible_tabs(self) -> tuple[list[str], list[str]]:
-    """
-    Calculate which tabs should be visible and which should be in dropdown.
-    Priority: active tab + adjacent tabs, then others.
-
-    Returns:
-        Tuple of (visible_tab_ids, hidden_tab_ids)
-    """
-    if self._boundaries.width == 0:
-      # No width info yet, show all tabs
-      return self._state.tabs_order.copy(), []
-    
-    available_width = self._boundaries.width - self.DROPDOWN_BTN_WIDTH
-    visible_tabs = []
-    hidden_tabs = []
-    
-    # Find active tab index
-    active_index = -1
-    if self._state.active_tab in self._state.tabs_order:
-      active_index = self._state.tabs_order.index(self._state.active_tab)
-    
-    # Calculate widths for all tabs
-    tab_widths = {}
-    for tab_id in self._state.tabs_order:
-      label = self._state.tabs[tab_id].get('label', 'Untitled')
-      tab_widths[tab_id] = self._estimate_tab_width(label)
-    
-    # Strategy: Start with active tab, then add adjacent tabs alternating left/right
-    used_width = 0
-    added_indices = set()
-    
-    # Always add active tab first if it exists
-    if active_index >= 0:
-      active_tab_id = self._state.tabs_order[active_index]
-      used_width += tab_widths[active_tab_id]
-      if used_width <= available_width:
-        visible_tabs.append(active_tab_id)
-        added_indices.add(active_index)
-      else:
-        # Even active tab doesn't fit, add to hidden
-        hidden_tabs.append(active_tab_id)
-    
-    # Add adjacent tabs alternating left and right
-    left_offset = 1
-    right_offset = 1
-    
-    while used_width < available_width and len(added_indices) < len(self._state.tabs_order):
-      added_this_round = False
-      
-      # Try to add tab to the right
-      right_index = active_index + right_offset
-      if right_index < len(self._state.tabs_order) and right_index not in added_indices:
-        tab_id = self._state.tabs_order[right_index]
-        tab_width = tab_widths[tab_id]
-        if used_width + tab_width <= available_width:
-          visible_tabs.append(tab_id)
-          added_indices.add(right_index)
-          used_width += tab_width
-          added_this_round = True
-        right_offset += 1
-      
-      # Try to add tab to the left
-      left_index = active_index - left_offset
-      if left_index >= 0 and left_index not in added_indices:
-        tab_id = self._state.tabs_order[left_index]
-        tab_width = tab_widths[tab_id]
-        if used_width + tab_width <= available_width:
-          visible_tabs.insert(0, tab_id)  # Insert at beginning to maintain order
-          added_indices.add(left_index)
-          used_width += tab_width
-          added_this_round = True
-        left_offset += 1
-      
-      # If we couldn't add any tab this round, we're done
-      if not added_this_round:
-        break
-    
-    # All remaining tabs go to hidden
-    for i, tab_id in enumerate(self._state.tabs_order):
-      if i not in added_indices:
-        hidden_tabs.append(tab_id)
-    
-    return visible_tabs, hidden_tabs
   
   @staticmethod
   def _get_tab_count():
@@ -182,10 +121,16 @@ class TabsManager(MultipleInstance):
     return res
   
   def on_new_tab(self, label: str, component: Any, auto_increment=False):
+    logger.debug(f"on_new_tab {label=}, {component=}, {auto_increment=}")
     if auto_increment:
       label = f"{label}_{self._get_tab_count()}"
-    self.add_tab(label, component)
+    tab_id = self.add_tab(label, component)
-    return self
+    component = component or VisNetwork(self._session, nodes=vis_nodes, edges=vis_edges)
+    return (
+        self._mk_tabs_controller(),
+        self._wrap_tab_content(self._mk_tab_content(tab_id, component)),
+        self._mk_tabs_header(True),
+    )
   
   def add_tab(self, label: str, component: Any, activate: bool = True) -> str:
     """
@@ -199,13 +144,14 @@ class TabsManager(MultipleInstance):
     Returns:
         tab_id: The UUID of the tab (new or existing)
     """
+    logger.debug(f"add_tab {label=}, component={component}, activate={activate}")
     # copy the state to avoid multiple database call
     state = self._state.copy()
     
     # Extract component ID if the component has a get_id() method
     component_type, component_id = None, None
     if isinstance(component, BaseInstance):
-      component_type = type(component).__name__
+      component_type = component.get_prefix() if isinstance(component, BaseInstance) else type(component).__name__
       component_id = component.get_id()
     
     # Check if a tab with the same component_type, component_id AND label already exists
@@ -249,11 +195,23 @@ class TabsManager(MultipleInstance):
     return tab_id
   
   def show_tab(self, tab_id):
+    logger.debug(f"show_tab {tab_id=}")
     if tab_id not in self._state.tabs:
+      logger.debug(f"  Tab not found.")
       return None
     
+    logger.debug(f"  Tab label is: {self._state.tabs[tab_id]['label']}")
     self._state.active_tab = tab_id
-    return self
+    
+    if tab_id not in self._state._tabs_content:
+      logger.debug(f"  Content does not exist. Creating it.")
+      content = self._get_tab_content(tab_id)
+      tab_content = self._mk_tab_content(tab_id, content)
+      self._state._tabs_content[tab_id] = tab_content
+      return self._mk_tabs_controller(), self._wrap_tab_content(tab_content)
+    else:
+      logger.debug(f"  Content already exists. Just switch.")
+      return self._mk_tabs_controller()
   
   def close_tab(self, tab_id: str):
     """
@@ -265,6 +223,7 @@ class TabsManager(MultipleInstance):
     Returns:
         Self for chaining
     """
+    logger.debug(f"close_tab {tab_id=}")
     if tab_id not in self._state.tabs:
       return self
     
@@ -309,7 +268,9 @@ class TabsManager(MultipleInstance):
     return mk.icon(tab_add24_regular,
                    id=f"{self._id}-add-tab-btn",
                    cls="mf-tab-btn",
-                   command=self.commands.add_tab(f"Untitled", None, True))
+                   command=self.commands.add_tab(f"Untitled",
+                                                 None,
+                                                 True))
   
   def _mk_tab_button(self, tab_id: str, tab_data: dict, in_dropdown: bool = False):
     """
@@ -345,15 +306,7 @@ class TabsManager(MultipleInstance):
       data_manager_id=self._id
     )
   
-  def _mk_tabs_header(self):
+  def _mk_tabs_header(self, oob=False):
-    """
-    Create the tabs header containing visible tab buttons and dropdown.
-
-    Returns:
-        Div element containing visible tabs and dropdown button
-    """
-    visible_tabs, hidden_tabs = self._calculate_visible_tabs()
-    
     # Create visible tab buttons
     visible_tab_buttons = [
         self._mk_tab_button(tab_id, self._state.tabs[tab_id])
@@ -364,14 +317,28 @@ class TabsManager(MultipleInstance):
     header_content = [*visible_tab_buttons]
     
     return Div(
-      Div(
       Div(*header_content, cls="mf-tabs-header", id=f"{self._id}-header"),
       self._mk_show_tabs_menu(),
-        cls="mf-tabs-header-wrapper"
+      id=f"{self._id}-header-wrapper",
+      cls="mf-tabs-header-wrapper",
+      hx_swap_oob="true" if oob else None
     ),
+  
+  def _mk_tabs_controller(self):
+    return Div(
+      Div(id=f"{self._id}-content-controller", data_active_tab=f"{self._state.active_tab}"),
+      Script(f'updateTabs("{self._id}-content-controller");'),
     )
   
-  def _mk_tab_content(self):
+  def _mk_tab_content(self, tab_id: str, content):
+    is_active = tab_id == self._state.active_tab
+    return Div(
+      content if content else Div("No Content", cls="mf-empty-content"),
+      cls=f"mf-tab-content {'hidden' if not is_active else ''}",  # ← ici
+      id=f"{self._id}-{tab_id}-content",
+    )
+  
+  def _mk_tab_content_wrapper(self):
     """
     Create the active tab content area.
 
@@ -385,9 +352,9 @@ class TabsManager(MultipleInstance):
       content = component
     
     return Div(
-      content if content else Div("No Content", cls="mf-empty-content"),
+      self._mk_tab_content(self._state.active_tab, content),
-      cls="mf-tab-content",
+      cls="mf-tab-content-wrapper",
-      id=f"{self._id}-content"
+      id=f"{self._id}-content-wrapper",
     )
   
   def _mk_show_tabs_menu(self):
@@ -405,6 +372,15 @@ class TabsManager(MultipleInstance):
       cls="dropdown dropdown-end"
     )
   
+  def _wrap_tab_content(self, tab_content):
+    return Div(
+      tab_content,
+      hx_swap_oob=f"beforeend:#{self._id}-content-wrapper",
+    )
+  
+  def update_boundaries(self):
+    return Script(f"updateBoundaries('{self._id}');")
+  
   def render(self):
     """
     Render the complete TabsManager component.
@@ -413,10 +389,11 @@ class TabsManager(MultipleInstance):
         Div element containing tabs header, content area, and resize script
     """
     return Div(
+      self._mk_tabs_controller(),
       self._mk_tabs_header(),
-      self._mk_tab_content(),
+      self._mk_tab_content_wrapper(),
       cls="mf-tabs-manager",
-      id=self._id
+      id=self._id,
     )
   
   def __ft__(self):

src/myfasthtml/controls/VisNetwork.py

@@ -0,0 +1,71 @@
+import logging
+
+from fasthtml.components import Script, Div
+
+from myfasthtml.controls.helpers import Ids
+from myfasthtml.core.instances import MultipleInstance
+
+logger = logging.getLogger("VisNetwork")
+
+class VisNetwork(MultipleInstance):
+  def __init__(self, session, _id=None, nodes=None, edges=None, options=None):
+    super().__init__(session, Ids.VisNetwork, _id=_id)
+    logger.debug(f"VisNetwork created with id: {self._id}")
+    
+    # Default values
+    self.nodes = nodes or []
+    self.edges = edges or []
+    self.options = options or {
+        "autoResize": True,
+        "interaction": {
+            "dragNodes": True,
+            "zoomView": True,
+            "dragView": True,
+        },
+        "physics": {"enabled": True}
+    }
+  
+  def render(self):
+    # Prepare JS arrays (no JSON library needed)
+    js_nodes = ",\n    ".join(
+      f'{{ id: {n["id"]}, label: "{n.get("label", "")}" }}'
+      for n in self.nodes
+    )
+    js_edges = ",\n    ".join(
+      f'{{ from: {e["from"]}, to: {e["to"]} }}'
+      for e in self.edges
+    )
+    
+    # Convert Python options to JS
+    import json
+    js_options = json.dumps(self.options, indent=2)
+    
+    return (
+        Div(
+          id=self._id,
+          cls="mf-vis",
+          #style="width:100%; height:100%;",  # Let parent control the layout
+        ),
+        
+        # The script initializing Vis.js
+        Script(f"""
+                (function() {{
+                  const container = document.getElementById("{self._id}");
+                  const nodes = new vis.DataSet([
+                      {js_nodes}
+                  ]);
+                  const edges = new vis.DataSet([
+                      {js_edges}
+                  ]);
+                  const data = {{
+                      nodes: nodes,
+                      edges: edges
+                  }};
+                  const options = {js_options};
+                  const network = new vis.Network(container, data, options);
+                }})();
+            """)
+    )
+  
+  def __ft__(self):
+    return self.render()

src/myfasthtml/controls/helpers.py

@@ -13,6 +13,7 @@ class Ids:
   Layout = "mf-layout"
   TabsManager = "mf-tabs-manager"
   UserProfile = "mf-user-profile"
+  VisNetwork = "mf-vis-network"
 
 
 class mk:

src/myfasthtml/core/commands.py

@@ -159,7 +159,7 @@ class Command(BaseCommand):
     if isinstance(ret, (list, tuple)):
       for r in ret[1:]:
         if hasattr(r, 'attrs'):
-          r.attrs["hx-swap-oob"] = "true"
+          r.attrs["hx-swap-oob"] = r.attrs.get("hx-swap-oob", "true")
     
     if not ret_from_bindings:
       return ret

src/myfasthtml/core/instances_helper.py

@@ -0,0 +1,11 @@
+from myfasthtml.controls.VisNetwork import VisNetwork
+from myfasthtml.controls.helpers import Ids
+
+
+class InstancesHelper:
+  @staticmethod
+  def dynamic_get(session, component_type: str, instance_id: str):
+    if component_type == Ids.VisNetwork:
+      return VisNetwork(session, _id=instance_id)
+    
+    return None

src/myfasthtml/myfastapp.py

@@ -31,6 +31,7 @@ def get_asset_content(filename):
 
 
 def create_app(daisyui: Optional[bool] = True,
+               vis: Optional[bool] = True,
                protect_routes: Optional[bool] = True,
                mount_auth_app: Optional[bool] = False,
                base_url: Optional[str] = None,
@@ -63,6 +64,11 @@ def create_app(daisyui: Optional[bool] = True,
         Script(src="/myfasthtml/tailwindcss-browser@4.js"),
     ]
   
+  if vis:
+    hdrs += [
+        Script(src="/myfasthtml/vis-network.min.js"),
+    ]
+  
   beforeware = create_auth_beforeware() if protect_routes else None
   app, rt = fasthtml.fastapp.fast_app(before=beforeware, hdrs=tuple(hdrs), **kwargs)