make expansion title text bindable

nicegui/elements/expansion.py

@@ -2,10 +2,12 @@ from typing import Optional
 
 import justpy as jp
 
+from ..binding import BindableProperty, bind_from, bind_to
 from .group import Group
 
 
 class Expansion(Group):
+    text = BindableProperty()
 
     def __init__(self, text: str, *, icon: Optional[str] = None):
         '''Expansion Element
@@ -17,3 +19,22 @@ class Expansion(Group):
         '''
         view = jp.QExpansionItem(label=text, icon=icon, delete_flag=False, temp=False)
         super().__init__(view)
+
+        self.text = text
+        self.bind_text_to(self.view, 'label')
+
+    def set_text(self, text: str):
+        self.text = text
+
+    def bind_text_to(self, target_object, target_name, forward=lambda x: x):
+        bind_to(self, 'text', target_object, target_name, forward=forward)
+        return self
+
+    def bind_text_from(self, target_object, target_name, backward=lambda x: x):
+        bind_from(self, 'text', target_object, target_name, backward=backward)
+        return self
+
+    def bind_text(self, target_object, target_name, forward=lambda x: x, backward=lambda x: x):
+        bind_from(self, 'text', target_object, target_name, backward=backward)
+        bind_to(self, 'text', target_object, target_name, forward=forward)
+        return self