Added IconsHelper and updated Keyboard to support require_inside flag

src/myfasthtml/controls/IconsHelper.py

@@ -0,0 +1,71 @@
+from myfasthtml.core.constants import ColumnType
+from myfasthtml.icons.fluent import question20_regular, brain_circuit20_regular, number_symbol20_regular, \
+  number_row20_regular
+from myfasthtml.icons.fluent_p1 import checkbox_checked20_regular, checkbox_unchecked20_regular, \
+  checkbox_checked20_filled, math_formula16_regular
+from myfasthtml.icons.fluent_p2 import text_field20_regular, text_bullet_list_square20_regular
+from myfasthtml.icons.fluent_p3 import calendar_ltr20_regular
+
+default_icons = {
+    None: question20_regular,
+    True: checkbox_checked20_regular,
+    False: checkbox_unchecked20_regular,
+    
+    "Brain": brain_circuit20_regular,
+    
+    ColumnType.RowIndex: number_symbol20_regular,
+    ColumnType.Text: text_field20_regular,
+    ColumnType.Number: number_row20_regular,
+    ColumnType.Datetime: calendar_ltr20_regular,
+    ColumnType.Bool: checkbox_checked20_filled,
+    ColumnType.Enum: text_bullet_list_square20_regular,
+    ColumnType.Formula: math_formula16_regular,
+}
+
+
+class IconsHelper:
+  _icons = default_icons.copy()
+  
+  @staticmethod
+  def get(name, package=None):
+    """
+    Fetches and returns an icon resource based on the provided name and optional package. If the icon is not already
+    cached, it will attempt to dynamically load the icon from the available modules under the `myfasthtml.icons` package.
+    This method uses an internal caching mechanism to store previously fetched icons for future quick lookups.
+
+    :param name: The name of the requested icon.
+    :param package: The optional sub-package to limit the search for the requested icon. If not provided, the method will
+        iterate through all available modules within the `myfasthtml.icons` package.
+    :return: The requested icon resource if found; otherwise, returns None.
+    :rtype: object or None
+    """
+    if name in IconsHelper._icons:
+      return IconsHelper._icons[name]
+    
+    import importlib
+    import pkgutil
+    import myfasthtml.icons as icons_pkg
+    
+    _UTILITY_MODULES = {'manage_icons', 'update_icons'}
+    
+    if package:
+      module = importlib.import_module(f"myfasthtml.icons.{package}")
+      icon = getattr(module, name, None)
+      if icon is not None:
+        IconsHelper._icons[name] = icon
+      return icon
+    
+    for _, modname, _ in pkgutil.iter_modules(icons_pkg.__path__):
+      if modname in _UTILITY_MODULES:
+        continue
+      module = importlib.import_module(f"myfasthtml.icons.{modname}")
+      icon = getattr(module, name, None)
+      if icon is not None:
+        IconsHelper._icons[name] = icon
+        return icon
+    
+    return None
+  
+  @staticmethod
+  def reset():
+    IconsHelper._icons = default_icons.copy()