Replace ConstrainedControl with LayoutControl

Refactored all usages of ConstrainedControl to LayoutControl across control implementations. Introduced LayoutControl as the new wrapper for layout constraints, with ConstrainedControl now extending LayoutControl for backward compatibility. Updated documentation and example paths to reflect the new naming and organization.

Author: FeodorFitsner

packages/flet/lib/src/controls/animated_switcher.dart

@@ -47,6 +47,6 @@ class AnimatedSwitcherControl extends StatelessWidget {
       },
       child: content,
     );
-    return ConstrainedControl(control: control, child: animatedSwitcher);
+    return LayoutControl(control: control, child: animatedSwitcher);
   }
 }

packages/flet/lib/src/controls/base_controls.dart

@@ -29,11 +29,20 @@ class BaseControl extends StatelessWidget {
   }
 }
 
-class ConstrainedControl extends StatelessWidget {
+// TODO - remove when extensions migrated to LayoutControl
+class ConstrainedControl extends LayoutControl {
+  const ConstrainedControl({
+    super.key,
+    required super.control,
+    required super.child,
+  });
+}
+
+class LayoutControl extends StatelessWidget {
   final Control control;
   final Widget child;
 
-  const ConstrainedControl({
+  const LayoutControl({
     super.key,
     required this.control,
     required this.child,

packages/flet/lib/src/controls/bottom_app_bar.dart

@@ -22,6 +22,6 @@ class BottomAppBarControl extends StatelessWidget {
       child: control.buildWidget("content"),
     );
 
-    return ConstrainedControl(control: control, child: bottomAppBar);
+    return LayoutControl(control: control, child: bottomAppBar);
   }
 }

packages/flet/lib/src/controls/button.dart

@@ -218,6 +218,6 @@ class _ButtonControlState extends State<ButtonControl> with FletStoreMixin {
       }
     }
 
-    return ConstrainedControl(control: widget.control, child: button);
+    return LayoutControl(control: widget.control, child: button);
   }
 }

packages/flet/lib/src/controls/canvas.dart

@@ -167,7 +167,7 @@ class _CanvasControlState extends State<CanvasControl> {
       child: widget.control.buildWidget("content"),
     );
 
-    return ConstrainedControl(control: widget.control, child: paint);
+    return LayoutControl(control: widget.control, child: paint);
   }
 }
 

packages/flet/lib/src/controls/card.dart

@@ -77,6 +77,6 @@ class CardControl extends StatelessWidget {
           child: contentWidget);
     }
 
-    return ConstrainedControl(control: control, child: card);
+    return LayoutControl(control: control, child: card);
   }
 }

packages/flet/lib/src/controls/checkbox.dart

@@ -136,6 +136,6 @@ class _CheckboxControlState extends State<CheckboxControl> {
           child: FittedBox(fit: BoxFit.fill, child: result));
     }
 
-    return ConstrainedControl(control: widget.control, child: result);
+    return LayoutControl(control: widget.control, child: result);
   }
 }

packages/flet/lib/src/controls/chip.dart

@@ -136,6 +136,6 @@ class _ChipControlState extends State<ChipControl> {
           : null,
     );
 
-    return ConstrainedControl(control: widget.control, child: chip);
+    return LayoutControl(control: widget.control, child: chip);
   }
 }

packages/flet/lib/src/controls/circle_avatar.dart

@@ -72,6 +72,6 @@ class CircleAvatarControl extends StatelessWidget {
             : null,
         child: content);
 
-    return ConstrainedControl(control: control, child: avatar);
+    return LayoutControl(control: control, child: avatar);
   }
 }

packages/flet/lib/src/controls/column.dart

@@ -59,6 +59,6 @@ class ColumnControl extends StatelessWidget {
       child = ScrollNotificationControl(control: control, child: child);
     }
 
-    return ConstrainedControl(control: control, child: child);
+    return LayoutControl(control: control, child: child);
   }
 }