"""Base component definitions.""" from __future__ import annotations import typing from abc import ABC from functools import wraps from typing import Any, Callable, Dict, List, Optional, Set, Type, Union from reflex import constants from reflex.base import Base from reflex.components.tags import Tag from reflex.constants import EventTriggers from reflex.event import ( EventChain, EventHandler, EventSpec, call_event_fn, call_event_handler, get_handler_args, ) from reflex.style import Style from reflex.utils import console, format, imports, types from reflex.vars import BaseVar, ImportVar, Var class Component(Base, ABC): """The base class for all Reflex components.""" # The children nested within the component. children: List[Component] = [] # The style of the component. style: Style = Style() # A mapping from event triggers to event chains. event_triggers: Dict[str, Union[EventChain, Var]] = {} # The library that the component is based on. library: Optional[str] = None # List here the non-react dependency needed by `library` lib_dependencies: List[str] = [] # The tag to use when rendering the component. tag: Optional[str] = None # The alias for the tag. alias: Optional[str] = None # Whether the import is default or named. is_default: Optional[bool] = False # A unique key for the component. key: Any = None # The id for the component. id: Any = None # The class name for the component. class_name: Any = None # Special component props. special_props: Set[Var] = set() # Whether the component should take the focus once the page is loaded autofocus: bool = False # components that cannot be children invalid_children: List[str] = [] # components that are only allowed as children valid_children: List[str] = [] # custom attribute custom_attrs: Dict[str, str] = {} @classmethod def __init_subclass__(cls, **kwargs): """Set default properties. Args: **kwargs: The kwargs to pass to the superclass. """ super().__init_subclass__(**kwargs) # Get all the props for the component. props = cls.get_props() # Convert fields to props, setting default values. for field in cls.get_fields().values(): # If the field is not a component prop, skip it. if field.name not in props: continue # Set default values for any props. if types._issubclass(field.type_, Var): field.required = False field.default = Var.create(field.default) def __init__(self, *args, **kwargs): """Initialize the component. Args: *args: Args to initialize the component. **kwargs: Kwargs to initialize the component. Raises: TypeError: If an invalid prop is passed. """ # Set the id and children initially. children = kwargs.get("children", []) initial_kwargs = { "id": kwargs.get("id"), "children": children, **{ prop: Var.create(kwargs[prop]) for prop in self.get_initial_props() if prop in kwargs }, } super().__init__(**initial_kwargs) self._validate_component_children(children) # Get the component fields, triggers, and props. fields = self.get_fields() triggers = self.get_event_triggers().keys() props = self.get_props() # Add any events triggers. if "event_triggers" not in kwargs: kwargs["event_triggers"] = {} kwargs["event_triggers"] = kwargs["event_triggers"].copy() # Iterate through the kwargs and set the props. for key, value in kwargs.items(): if key in triggers: # Event triggers are bound to event chains. field_type = EventChain elif key in props: # Set the field type. field_type = fields[key].type_ else: continue # Check whether the key is a component prop. if types._issubclass(field_type, Var): try: # Try to create a var from the value. kwargs[key] = Var.create(value) # Check that the var type is not None. if kwargs[key] is None: raise TypeError # Get the passed type and the var type. passed_type = kwargs[key].type_ expected_type = fields[key].outer_type_.__args__[0] except TypeError: # If it is not a valid var, check the base types. passed_type = type(value) expected_type = fields[key].outer_type_ if not types._issubclass(passed_type, expected_type): raise TypeError( f"Invalid var passed for prop {key}, expected type {expected_type}, got value {value} of type {passed_type}." ) # Check if the key is an event trigger. if key in triggers: # Temporarily disable full control for event triggers. kwargs["event_triggers"][key] = self._create_event_chain(key, value) # Remove any keys that were added as events. for key in kwargs["event_triggers"]: del kwargs[key] # Add style props to the component. style = kwargs.get("style", {}) if isinstance(style, List): # Merge styles, the later ones overriding keys in the earlier ones. style = {k: v for style_dict in style for k, v in style_dict.items()} kwargs["style"] = Style( { **style, **{attr: value for attr, value in kwargs.items() if attr not in fields}, } ) if "custom_attrs" not in kwargs: kwargs["custom_attrs"] = {} # Convert class_name to str if it's list class_name = kwargs.get("class_name", "") if isinstance(class_name, (List, tuple)): kwargs["class_name"] = " ".join(class_name) # Construct the component. super().__init__(*args, **kwargs) def _create_event_chain( self, event_trigger: str, value: Union[ Var, EventHandler, EventSpec, List[Union[EventHandler, EventSpec]], Callable ], ) -> Union[EventChain, Var]: """Create an event chain from a variety of input types. Args: event_trigger: The event trigger to bind the chain to. value: The value to create the event chain from. Returns: The event chain. Raises: ValueError: If the value is not a valid event chain. """ # Check if the trigger is a controlled event. triggers = self.get_event_triggers() # If it's an event chain var, return it. if isinstance(value, Var): if value.type_ is not EventChain: raise ValueError(f"Invalid event chain: {value}") return value arg_spec = triggers.get(event_trigger, lambda: []) wrapped = False # If the input is a single event handler, wrap it in a list. if isinstance(value, (EventHandler, EventSpec)): wrapped = True value = [value] # If the input is a list of event handlers, create an event chain. if isinstance(value, List): if not wrapped: console.deprecate( feature_name="EventChain", reason="to avoid confusion, only use yield API", deprecation_version="0.2.8", removal_version="0.2.9", ) events = [] for v in value: if isinstance(v, EventHandler): # Call the event handler to get the event. event = call_event_handler(v, arg_spec) # type: ignore # Add the event to the chain. events.append(event) elif isinstance(v, EventSpec): # Add the event to the chain. events.append(v) elif isinstance(v, Callable): # Call the lambda to get the event chain. events.extend(call_event_fn(v, arg_spec)) # type: ignore else: raise ValueError(f"Invalid event: {v}") # If the input is a callable, create an event chain. elif isinstance(value, Callable): events = call_event_fn(value, arg_spec) # type: ignore # Otherwise, raise an error. else: raise ValueError(f"Invalid event chain: {value}") # Add args to the event specs if necessary. events = [ EventSpec( handler=e.handler, args=get_handler_args(e), client_handler_name=e.client_handler_name, ) for e in events ] # Return the event chain. if isinstance(arg_spec, Var): return EventChain(events=events, args_spec=None) else: return EventChain(events=events, args_spec=arg_spec) # type: ignore def get_event_triggers(self) -> Dict[str, Any]: """Get the event triggers for the component. Returns: The event triggers. """ deprecated_triggers = self.get_triggers() if deprecated_triggers: console.deprecate( feature_name=f"get_triggers ({self.__class__.__name__})", reason="replaced by get_event_triggers", deprecation_version="0.2.8", removal_version="0.2.9", ) deprecated_triggers = { trigger: lambda: [] for trigger in deprecated_triggers } else: deprecated_triggers = {} deprecated_controlled_triggers = self.get_controlled_triggers() if deprecated_controlled_triggers: console.deprecate( feature_name=f"get_controlled_triggers ({self.__class__.__name__})", reason="replaced by get_event_triggers", deprecation_version="0.2.8", removal_version="0.2.9", ) return { EventTriggers.ON_FOCUS: lambda: [], EventTriggers.ON_BLUR: lambda: [], EventTriggers.ON_CLICK: lambda: [], EventTriggers.ON_CONTEXT_MENU: lambda: [], EventTriggers.ON_DOUBLE_CLICK: lambda: [], EventTriggers.ON_MOUSE_DOWN: lambda: [], EventTriggers.ON_MOUSE_ENTER: lambda: [], EventTriggers.ON_MOUSE_LEAVE: lambda: [], EventTriggers.ON_MOUSE_MOVE: lambda: [], EventTriggers.ON_MOUSE_OUT: lambda: [], EventTriggers.ON_MOUSE_OVER: lambda: [], EventTriggers.ON_MOUSE_UP: lambda: [], EventTriggers.ON_SCROLL: lambda: [], EventTriggers.ON_MOUNT: lambda: [], EventTriggers.ON_UNMOUNT: lambda: [], **deprecated_triggers, **deprecated_controlled_triggers, } def get_triggers(self) -> Set[str]: """Get the triggers for non controlled events [DEPRECATED]. Returns: A set of non controlled triggers. """ return set() def get_controlled_triggers(self) -> Dict[str, Var]: """Get the event triggers that pass the component's value to the handler [DEPRECATED]. Returns: A dict mapping the event trigger to the var that is passed to the handler. """ return {} def __repr__(self) -> str: """Represent the component in React. Returns: The code to render the component. """ return format.json_dumps(self.render()) def __str__(self) -> str: """Represent the component in React. Returns: The code to render the component. """ from reflex.compiler.compiler import _compile_component return _compile_component(self) def _render(self) -> Tag: """Define how to render the component in React. Returns: The tag to render. """ # Create the base tag. tag = Tag( name=self.tag if not self.alias else self.alias, special_props=self.special_props, ) # Add component props to the tag. props = { attr[:-1] if attr.endswith("_") else attr: getattr(self, attr) for attr in self.get_props() } # Add ref to element if `id` is not None. ref = self.get_ref() if ref is not None: props["ref"] = Var.create(ref, is_local=False) return tag.add_props(**props) @classmethod def get_props(cls) -> Set[str]: """Get the unique fields for the component. Returns: The unique fields. """ return set(cls.get_fields()) - set(Component.get_fields()) @classmethod def get_initial_props(cls) -> Set[str]: """Get the initial props to set for the component. Returns: The initial props to set. """ return set() @classmethod def create(cls, *children, **props) -> Component: """Create the component. Args: *children: The children of the component. **props: The props of the component. Returns: The component. Raises: TypeError: If an invalid child is passed. """ # Import here to avoid circular imports. from reflex.components.base.bare import Bare # Validate all the children. for child in children: # Make sure the child is a valid type. if not types._isinstance(child, ComponentChild): raise TypeError( "Children of Reflex components must be other components, " "state vars, or primitive Python types. " f"Got child {child} of type {type(child)}.", ) children = [ child if isinstance(child, Component) else Bare.create(contents=Var.create(child, is_string=True)) for child in children ] return cls(children=children, **props) def _add_style(self, style: dict): """Add additional style to the component. Args: style: A style dict to apply. """ self.style.update(style) def add_style(self, style: ComponentStyle) -> Component: """Add additional style to the component and its children. Args: style: A dict from component to styling. Returns: The component with the additional style. """ if type(self) in style: # Extract the style for this component. component_style = Style(style[type(self)]) # Only add style props that are not overridden. component_style = { k: v for k, v in component_style.items() if k not in self.style } # Add the style to the component. self._add_style(component_style) # Recursively add style to the children. for child in self.children: child.add_style(style) return self def render(self) -> Dict: """Render the component. Returns: The dictionary for template of component. """ tag = self._render() rendered_dict = dict( tag.add_props( **self.event_triggers, key=self.key, sx=self.style, id=self.id, class_name=self.class_name, **self.custom_attrs, ).set( children=[child.render() for child in self.children], contents=str(tag.contents), props=tag.format_props(), ), autofocus=self.autofocus, ) return rendered_dict def _validate_component_children(self, children: List[Component]): """Validate the children components. Args: children: The children of the component. """ if not self.invalid_children and not self.valid_children: return comp_name = type(self).__name__ def validate_invalid_child(child_name): if child_name in self.invalid_children: raise ValueError( f"The component `{comp_name}` cannot have `{child_name}` as a child component" ) def validate_valid_child(child_name): if child_name not in self.valid_children: valid_child_list = ", ".join( [f"`{v_child}`" for v_child in self.valid_children] ) raise ValueError( f"The component `{comp_name}` only allows the components: {valid_child_list} as children. Got `{child_name}` instead." ) for child in children: name = type(child).__name__ if self.invalid_children: validate_invalid_child(name) if self.valid_children: validate_valid_child(name) def _get_custom_code(self) -> Optional[str]: """Get custom code for the component. Returns: The custom code. """ return None def get_custom_code(self) -> Set[str]: """Get custom code for the component and its children. Returns: The custom code. """ # Store the code in a set to avoid duplicates. code = set() # Add the custom code for this component. custom_code = self._get_custom_code() if custom_code is not None: code.add(custom_code) # Add the custom code for the children. for child in self.children: code |= child.get_custom_code() # Return the code. return code def _get_dynamic_imports(self) -> Optional[str]: """Get dynamic import for the component. Returns: The dynamic import. """ return None def get_dynamic_imports(self) -> Set[str]: """Get dynamic imports for the component and its children. Returns: The dynamic imports. """ # Store the import in a set to avoid duplicates. dynamic_imports = set() # Get dynamic import for this component. dynamic_import = self._get_dynamic_imports() if dynamic_import: dynamic_imports.add(dynamic_import) # Get the dynamic imports from children for child in self.children: dynamic_imports |= child.get_dynamic_imports() # Return the dynamic imports return dynamic_imports def _get_dependencies_imports(self): return { dep: {ImportVar(tag=None, render=False)} for dep in self.lib_dependencies } def _get_imports(self) -> imports.ImportDict: imports = {} if self.library is not None and self.tag is not None: imports[self.library] = {self.import_var} return {**self._get_dependencies_imports(), **imports} def get_imports(self) -> imports.ImportDict: """Get all the libraries and fields that are used by the component. Returns: The import dict with the required imports. """ return imports.merge_imports( self._get_imports(), *[child.get_imports() for child in self.children] ) def _get_mount_lifecycle_hook(self) -> str | None: """Generate the component lifecycle hook. Returns: The useEffect hook for managing `on_mount` and `on_unmount` events. """ # pop on_mount and on_unmount from event_triggers since these are handled by # hooks, not as actually props in the component on_mount = self.event_triggers.pop(EventTriggers.ON_MOUNT, None) on_unmount = self.event_triggers.pop(EventTriggers.ON_UNMOUNT, None) if on_mount: on_mount = format.format_event_chain(on_mount) if on_unmount: on_unmount = format.format_event_chain(on_unmount) if on_mount or on_unmount: return f""" useEffect(() => {{ {on_mount or ""} return () => {{ {on_unmount or ""} }} }}, []);""" def _get_ref_hook(self) -> str | None: """Generate the ref hook for the component. Returns: The useRef hook for managing refs. """ ref = self.get_ref() if ref is not None: return f"const {ref} = useRef(null); refs['{ref}'] = {ref};" def _get_hooks_internal(self) -> Set[str]: """Get the React hooks for this component managed by the framework. Downstream components should NOT override this method to avoid breaking framework functionality. Returns: Set of internally managed hooks. """ return set( hook for hook in [self._get_mount_lifecycle_hook(), self._get_ref_hook()] if hook ) def _get_hooks(self) -> Optional[str]: """Get the React hooks for this component. Downstream components should override this method to add their own hooks. Returns: The hooks for just this component. """ return def get_hooks(self) -> Set[str]: """Get the React hooks for this component and its children. Returns: The code that should appear just before returning the rendered component. """ # Store the code in a set to avoid duplicates. code = self._get_hooks_internal() # Add the hook code for this component. hooks = self._get_hooks() if hooks is not None: code.add(hooks) # Add the hook code for the children. for child in self.children: code |= child.get_hooks() return code def get_ref(self) -> Optional[str]: """Get the name of the ref for the component. Returns: The ref name. """ # do not create a ref if the id is dynamic or unspecified if self.id is None or isinstance(self.id, BaseVar): return None return format.format_ref(self.id) def get_refs(self) -> Set[str]: """Get the refs for the children of the component. Returns: The refs for the children. """ refs = set() ref = self.get_ref() if ref is not None: refs.add(ref) for child in self.children: refs |= child.get_refs() return refs def get_custom_components( self, seen: Optional[Set[str]] = None ) -> Set[CustomComponent]: """Get all the custom components used by the component. Args: seen: The tags of the components that have already been seen. Returns: The set of custom components. """ custom_components = set() # Store the seen components in a set to avoid infinite recursion. if seen is None: seen = set() for child in self.children: custom_components |= child.get_custom_components(seen=seen) return custom_components @property def import_var(self): """The tag to import. Returns: An import var. """ return ImportVar(tag=self.tag, is_default=self.is_default, alias=self.alias) # Map from component to styling. ComponentStyle = Dict[Union[str, Type[Component]], Any] ComponentChild = Union[types.PrimitiveType, Var, Component] class CustomComponent(Component): """A custom user-defined component.""" # Use the components library. library = f"/{constants.COMPONENTS_PATH}" # The function that creates the component. component_fn: Callable[..., Component] = Component.create # The props of the component. props: Dict[str, Any] = {} def __init__(self, *args, **kwargs): """Initialize the custom component. Args: *args: The args to pass to the component. **kwargs: The kwargs to pass to the component. """ super().__init__(*args, **kwargs) # Unset the style. self.style = Style() # Set the tag to the name of the function. self.tag = format.to_title_case(self.component_fn.__name__) # Set the props. props = typing.get_type_hints(self.component_fn) for key, value in kwargs.items(): # Skip kwargs that are not props. if key not in props: continue # Get the type based on the annotation. type_ = props[key] # Handle event chains. if types._issubclass(type_, EventChain): value = self._create_event_chain(key, value) self.props[format.to_camel_case(key)] = value continue # Convert the type to a Var, then get the type of the var. if not types._issubclass(type_, Var): type_ = Var[type_] type_ = types.get_args(type_)[0] # Handle subclasses of Base. if types._issubclass(type_, Base): try: value = BaseVar(name=value.json(), type_=type_, is_local=True) except Exception: value = Var.create(value) else: value = Var.create(value, is_string=type(value) is str) # Set the prop. self.props[format.to_camel_case(key)] = value def __eq__(self, other: Any) -> bool: """Check if the component is equal to another. Args: other: The other component. Returns: Whether the component is equal to the other. """ return isinstance(other, CustomComponent) and self.tag == other.tag def __hash__(self) -> int: """Get the hash of the component. Returns: The hash of the component. """ return hash(self.tag) @classmethod def get_props(cls) -> Set[str]: """Get the props for the component. Returns: The set of component props. """ return set() def get_custom_components( self, seen: Optional[Set[str]] = None ) -> Set[CustomComponent]: """Get all the custom components used by the component. Args: seen: The tags of the components that have already been seen. Returns: The set of custom components. """ assert self.tag is not None, "The tag must be set." # Store the seen components in a set to avoid infinite recursion. if seen is None: seen = set() custom_components = {self} | super().get_custom_components(seen=seen) # Avoid adding the same component twice. if self.tag not in seen: seen.add(self.tag) custom_components |= self.get_component().get_custom_components(seen=seen) return custom_components def _render(self) -> Tag: """Define how to render the component in React. Returns: The tag to render. """ return Tag(name=self.tag).add_props(**self.props) def get_prop_vars(self) -> List[BaseVar]: """Get the prop vars. Returns: The prop vars. """ return [ BaseVar( name=name, type_=prop.type_ if types._isinstance(prop, Var) else type(prop), ) for name, prop in self.props.items() ] def get_component(self) -> Component: """Render the component. Returns: The code to render the component. """ return self.component_fn(*self.get_prop_vars()) def custom_component( component_fn: Callable[..., Component] ) -> Callable[..., CustomComponent]: """Create a custom component from a function. Args: component_fn: The function that creates the component. Returns: The decorated function. """ @wraps(component_fn) def wrapper(*children, **props) -> CustomComponent: return CustomComponent(component_fn=component_fn, children=children, **props) return wrapper class NoSSRComponent(Component): """A dynamic component that is not rendered on the server.""" def _get_imports(self): imports = {"next/dynamic": {ImportVar(tag="dynamic", is_default=True)}} return { **imports, self.library: {ImportVar(tag=None, render=False)}, **self._get_dependencies_imports(), } def _get_dynamic_imports(self) -> str: opts_fragment = ", { ssr: false });" # extract the correct import name from library name if self.library is None: raise ValueError("Undefined library for NoSSRComponent") import_name_parts = [p for p in self.library.rpartition("@") if p != ""] import_name = ( import_name_parts[0] if import_name_parts[0] != "@" else self.library ) library_import = f"const {self.tag} = dynamic(() => import('{import_name}')" mod_import = ( # https://nextjs.org/docs/pages/building-your-application/optimizing/lazy-loading#with-named-exports f".then((mod) => mod.{self.tag})" if not self.is_default else "" ) return "".join((library_import, mod_import, opts_fragment))