Gui/improve uiview

CHANGELOG.md

@@ -3,6 +3,12 @@
 You can grab pre-release versions from PyPi. See the available versions from the
 Arcade [PyPi Release History](https://pypi.org/project/arcade/#history) page.
 
+## Version 3.1.2 (unreleased)
+
+- GUI
+  - Fix `UIScrollArea.add` always returning None 
+  - Support `layer` in `UIView.add_widget()`
+
 ## Version 3.1.1
 
 * Text objects are now lazy and can be created before the window

arcade/gui/experimental/scroll_area.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import Iterable
+from typing import Iterable, TypeVar
 
 from pyglet.event import EVENT_UNHANDLED
 
@@ -23,6 +23,8 @@
 )
 from arcade.types import LBWH
 
+W = TypeVar("W", bound="UIWidget")
+
 
 class UIScrollBar(UIWidget):
     """Scroll bar for a UIScrollLayout.
@@ -210,7 +212,7 @@ def __init__(
         y: float = 0,
         width: float = 300,
         height: float = 300,
-        children: Iterable["UIWidget"] = tuple(),
+        children: Iterable[UIWidget] = tuple(),
         size_hint=None,
         size_hint_min=None,
         size_hint_max=None,
@@ -242,15 +244,17 @@ def __init__(
         bind(self, "scroll_x", self.trigger_full_render)
         bind(self, "scroll_y", self.trigger_full_render)
 
-    def add(self, child: "UIWidget", **kwargs):
+    def add(self, child: W, **kwargs) -> W:
         """Add a child to the widget."""
         if self._children:
             raise ValueError("UIScrollArea can only have one child")
 
         super().add(child, **kwargs)
         self.trigger_full_render()
 
-    def remove(self, child: "UIWidget"):
+        return child
+
+    def remove(self, child: UIWidget):
         """Remove a child from the widget."""
         super().remove(child)
         self.trigger_full_render()

arcade/gui/ui_manager.py

@@ -320,7 +320,7 @@ def on_update(self, time_delta):
         """Dispatches an update event to all widgets in the UIManager."""
         return self.dispatch_ui_event(UIOnUpdateEvent(self, time_delta))
 
-    def draw(self, pixelated=False) -> None:
+    def draw(self, **kwargs) -> None:
         """Will draw all widgets to the window.
 
         UIManager caches all rendered widgets into a framebuffer (something like a

arcade/gui/view.py

@@ -31,9 +31,15 @@ def __init__(self):
         The UIManager of this view.
         """
 
-    def add_widget(self, widget: W) -> W:
-        """Add a widget to the UIManager of this view."""
-        return self.ui.add(widget)
+    def add_widget(self, widget: W, *, index=None, layer=UIManager.DEFAULT_LAYER) -> W:
+        """Add a widget to the UIManager of this view.
+
+        Args:
+            widget: widget to add
+            index: position a widget is added, None has the highest priority
+            layer: layer which the widget should be added to, higher layer are above
+        """
+        return self.ui.add(widget, index=index, layer=layer)
 
     def on_show_view(self):
         """If subclassing UIView, don't forget to call super().on_show_view()."""