Add scroll_view.py

owenthcarey · owenthcarey · commit c8c3448499b6 · 2023-07-20T19:40:37.000-07:00
diff --git a/libs/pythonnative/pythonnative/__init__.py b/libs/pythonnative/pythonnative/__init__.py
@@ -14,6 +14,7 @@
 from .page import Page
 from .picker_view import PickerView
 from .progress_view import ProgressView
+from .scroll_view import ScrollView
 from .search_bar import SearchBar
 from .stack_view import StackView
 from .switch import Switch
@@ -39,6 +40,7 @@
     "Page",
     "PickerView",
     "ProgressView",
+    "ScrollView",
     "SearchBar",
     "StackView",
     "Switch",
diff --git a/libs/pythonnative/pythonnative/page.py b/libs/pythonnative/pythonnative/page.py
@@ -134,8 +134,10 @@ def on_restore_instance_state(self) -> None:
 
         def navigate_to(self, page) -> None:
             # intent = jclass("android.content.Intent")(self.native_instance, page.native_class)
-            intent = jclass("android.content.Intent")(self.native_instance,
-                                                      jclass("com.pythonnative.pythonnative.SecondActivity"))
+            intent = jclass("android.content.Intent")(
+                self.native_instance,
+                jclass("com.pythonnative.pythonnative.SecondActivity"),
+            )
             self.native_instance.startActivity(intent)
 
 else:
diff --git a/libs/pythonnative/pythonnative/scroll_view.py b/libs/pythonnative/pythonnative/scroll_view.py
@@ -0,0 +1,61 @@
+from abc import ABC, abstractmethod
+from .utils import IS_ANDROID
+from .view import ViewBase
+
+# ========================================
+# Base class
+# ========================================
+
+
+class ScrollViewBase(ABC):
+    @abstractmethod
+    def __init__(self) -> None:
+        super().__init__()
+        self.views = []
+
+    @abstractmethod
+    def add_view(self, view) -> None:
+        pass
+
+
+if IS_ANDROID:
+    # ========================================
+    # Android class
+    # ========================================
+
+    from java import jclass
+
+    class ScrollView(ScrollViewBase, ViewBase):
+        def __init__(self, context) -> None:
+            super().__init__()
+            self.native_class = jclass("android.widget.ScrollView")
+            self.native_instance = self.native_class(context)
+
+        def add_view(self, view):
+            self.views.append(view)
+            # In Android, ScrollView can host only one direct child
+            if len(self.views) == 1:
+                self.native_instance.addView(view.native_instance)
+            else:
+                raise Exception("ScrollView can host only one direct child")
+
+else:
+    # ========================================
+    # iOS class
+    # ========================================
+
+    from rubicon.objc import ObjCClass
+
+    class ScrollView(ScrollViewBase, ViewBase):
+        def __init__(self) -> None:
+            super().__init__()
+            self.native_class = ObjCClass("UIScrollView")
+            self.native_instance = self.native_class.alloc().initWithFrame_(
+                ((0, 0), (0, 0))
+            )
+
+        def add_view(self, view):
+            self.views.append(view)
+            # Ensure view is a subview of scrollview
+            if view.native_instance not in self.native_instance.subviews:
+                self.native_instance.addSubview_(view.native_instance)
