Flet v0.23 Post Fixes - Part 2 (flet-dev#3507)

* Fix flet-dev#3503: `Slider.value` defaults to `min`

* Fix flet-dev#3505: add "hide" and "show" to  WindowEventType enum

* Fix flet-dev#3499: TypeError raised for isinstance check with Union in before_update method

- Corrected isinstance check in SnackBar.before_update to use a tuple of types instead of Union, resolving TypeError: "Subscripted generics cannot be used with class and instance checks".

* Fix `Page.open()` breaking after multiple calls

* Fix flet-dev#3516: delete Page.window.on_resize | deprecate Page.on_resize in favor of Page.on_resized

* Page: Typo in on_resized setter decorator

sdk/python/packages/flet-core/src/flet_core/page.py

@@ -155,12 +155,10 @@ def __init__(self, page: "Page"):
         self.page = page
         self.__alignment = None
         self.__on_event = EventHandler(lambda e: WindowEvent(e))
-        self.__on_resized = EventHandler(lambda e: WindowResizeEvent(e))
         self.page._add_event_handler(
             "window_event",
             self.__on_event.get_handler(),
         )
-        self.page._add_event_handler("resized", self.__on_resized.get_handler())
 
     # bgcolor
     @property
@@ -500,15 +498,6 @@ def on_event(self):
     def on_event(self, handler: "Optional[Callable[[WindowEvent], None]]"):
         self.__on_event.subscribe(handler)
 
-    # on_resize
-    @property
-    def on_resized(self):
-        return self.__on_resized
-
-    @on_resized.setter
-    def on_resized(self, handler: "Optional[Callable[[WindowReisizeEvent], None]]"):
-        self.__on_resized.subscribe(handler)
-
 
 class Page(AdaptiveControl):
     """
@@ -589,6 +578,8 @@ def __init__(
             "app_lifecycle_state_change",
             self.__on_app_lifecycle_state_change.get_handler(),
         )
+        self.__on_resized = EventHandler(lambda e: WindowResizeEvent(e))
+        self._add_event_handler("resized", self.__on_resized.get_handler())
 
         self.__last_route = None
 
@@ -1415,26 +1406,24 @@ def __on_invoke_method_result(self, e) -> None:
     def open(self, control: Control) -> None:
         if not hasattr(control, "open"):
             raise ValueError("control has no open attribute")
+
+        control.open = True
+
+        if isinstance(control, NavigationDrawer):
+            if control.position == NavigationDrawerPosition.END:
+                if self.end_drawer != control:
+                    self.end_drawer = control
+                    self.update()
+            else:
+                if self.drawer != control:
+                    self.drawer = control
+                    self.update()
         else:
-            control.open = True
-            if isinstance(control, NavigationDrawer):
-                if control.position == NavigationDrawerPosition.END:
-                    if self.end_drawer == control:
-                        control.update()
-                        return
-                    else:
-                        self.end_drawer = control
-                else:
-                    if self.drawer == control:
-                        control.update()
-                        return
-                    else:
-                        self.drawer = control
-                self.update()  # called only if the new drawer is different from the current one
-            elif control not in self.__offstage.controls:
+            if control not in self.__offstage.controls:
                 self.__offstage.controls.append(control)
                 self.__offstage.update()
-            return
+
+        control.update()
 
     @staticmethod
     def close(control: Control) -> None:
@@ -2752,23 +2741,31 @@ def on_close(self, handler: OptionalEventCallback):
     # on_resize
     @property
     @deprecated(
-        reason="Use Page.window.on_resized instead.",
+        reason="Use Page.on_resized instead.",
         version="0.23.0",
         delete_version="0.26.0",
         is_method=False,
     )
     def on_resize(self):
-        return self.__window.on_resized
+        return self.__on_resized
 
     @on_resize.setter
     @deprecated(
-        reason="Use Page.window.on_resized instead.",
+        reason="Use on_resized instead.",
         version="0.23.0",
         delete_version="0.26.0",
         is_method=False,
     )
-    def on_resize(self, handler: OptionalEventCallback):
-        self.__window.on_resized.subscribe(handler)
+    def on_resize(self, handler: "Optional[Callable[[WindowResizeEvent], None]]"):
+        self.__on_resized.subscribe(handler)
+
+    @property
+    def on_resized(self):
+        return self.__on_resized
+
+    @on_resized.setter
+    def on_resized(self, handler: "Optional[Callable[[WindowResizeEvent], None]]"):
+        self.__on_resized.subscribe(handler)
 
     # on_platform_brightness_change
     @property

sdk/python/packages/flet-core/src/flet_core/slider.py

@@ -175,7 +175,7 @@ def before_update(self):
     # value
     @property
     def value(self) -> OptionalNumber:
-        return self._get_attr("value", data_type="float", def_value=0)
+        return self._get_attr("value", data_type="float", def_value=self.min or 0)
 
     @value.setter
     def value(self, value: OptionalNumber):

sdk/python/packages/flet-core/src/flet_core/snack_bar.py

@@ -1,5 +1,5 @@
 from enum import Enum
-from typing import Any, Optional, Union
+from typing import Any, Optional
 
 from flet_core.buttons import OutlinedBorder
 from flet_core.control import Control, OptionalNumber
@@ -129,7 +129,7 @@ def before_update(self):
         super().before_update()
         self._set_attr_json("shape", self.__shape)
         self._set_attr_json("padding", self.__padding)
-        if isinstance(self.__margin, Union[int, float, Padding]) and not self.width:
+        if isinstance(self.__margin, (int, float, Padding)) and not self.width:
             # margin and width cannot be set together - if width is set, margin is ignored
             self._set_attr_json("margin", self.__margin)
 

sdk/python/packages/flet-core/src/flet_core/types.py

@@ -26,6 +26,8 @@ class WindowEventType(Enum):
     CLOSE = "close"
     FOCUS = "focus"
     BLUR = "blur"
+    HIDE = "hide"
+    SHOW = "show"
     MAXIMIZE = "maximize"
     UNMAXIMIZE = "unmaximize"
     MINIMIZE = "minimize"