V4: Fix constructor_args (#6093)

* Fix

* add changeset

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>

.changeset/funny-dodos-sip.md

@@ -0,0 +1,5 @@
+---
+"gradio": minor
+---
+
+feat:V4: Fix constructor_args

gradio/blocks.py

@@ -113,7 +113,7 @@ def __init__(
         self._skip_init_processing = _skip_init_processing
         self.parent: BlockContext | None = None
         self.is_rendered: bool = False
-        self.constructor_args: dict
+        self._constructor_args: dict
         self.state_session_capacity = 10000
 
         if render:
@@ -123,6 +123,16 @@ def __init__(
     def skip_api(self):
         return False
 
+    @property
+    def constructor_args(self) -> dict[str, Any]:
+        """Get the arguments passed to the component's initializer.
+
+        Only set classes whose metaclass is ComponentMeta
+        """
+        # the _constructor_args list is appended based on the mro of the class
+        # so the first entry is for the bottom of the hierarchy
+        return self._constructor_args[0] if self._constructor_args else {}
+
     @property
     def events(
         self,

gradio/component_meta.py

@@ -139,12 +139,14 @@ def updateable(fn):
     def wrapper(*args, **kwargs):
         fn_args = inspect.getfullargspec(fn).args
         self = args[0]
+        if not hasattr(self, "_constructor_args"):
+            self._constructor_args = []
         for i, arg in enumerate(args):
             if i == 0 or i >= len(fn_args):  #  skip self, *args
                 continue
             arg_name = fn_args[i]
             kwargs[arg_name] = arg
-        self.constructor_args = kwargs
+        self._constructor_args.append(kwargs)
         if in_event_listener():
             return None
         else:

gradio/events.py

@@ -287,7 +287,7 @@ def inner(*args, **kwargs):
 
             if Context.root_block is None:
                 raise AttributeError(
-                    "Cannot call {self.event_name} outside of a gradio.Blocks context."
+                    f"Cannot call {_event_name} outside of a gradio.Blocks context."
                 )
 
             dep, dep_index = Context.root_block.set_event_trigger(

test/test_components.py

@@ -2649,3 +2649,11 @@ def test_component_class_ids():
 
     # Make sure that the ids are unique
     assert len({button_id, textbox_id, json_id, microphone_id, audio_id}) == 5
+
+
+def test_constructor_args():
+    assert gr.Textbox(max_lines=314).constructor_args == {"max_lines": 314}
+    assert gr.LoginButton(icon="F00.svg", value="Log in please").constructor_args == {
+        "icon": "F00.svg",
+        "value": "Log in please",
+    }