opt hide top/bottom bar

Signed-off-by: dom <githubaccount56556@proton.me>

lib/common/widgets/custom_height_widget.dart

@@ -0,0 +1,71 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart' show RenderProxyBox;
+
+class CustomHeightWidget extends SingleChildRenderObjectWidget {
+  const CustomHeightWidget({
+    super.key,
+    required this.height,
+    this.offset = .zero,
+    required super.child,
+  });
+
+  final double height;
+
+  final Offset offset;
+
+  @override
+  RenderObject createRenderObject(BuildContext context) {
+    return RenderCustomHeightWidget(
+      height: height,
+      offset: offset,
+    );
+  }
+
+  @override
+  void updateRenderObject(
+    BuildContext context,
+    RenderCustomHeightWidget renderObject,
+  ) {
+    renderObject
+      ..height = height
+      ..offset = offset;
+  }
+}
+
+class RenderCustomHeightWidget extends RenderProxyBox {
+  RenderCustomHeightWidget({
+    required double height,
+    required Offset offset,
+  }) : _height = height,
+       _offset = offset;
+
+  double _height;
+  double get height => _height;
+  set height(double value) {
+    if (_height == value) return;
+    _height = value;
+    markNeedsLayout();
+  }
+
+  Offset _offset;
+  Offset get offset => _offset;
+  set offset(Offset value) {
+    if (_offset == value) return;
+    _offset = value;
+    markNeedsPaint();
+  }
+
+  @override
+  void performLayout() {
+    child!.layout(constraints, parentUsesSize: true);
+    size = constraints.constrainDimensions(constraints.maxWidth, height);
+  }
+
+  @override
+  void paint(PaintingContext context, Offset offset) {
+    context.paintChild(child!, offset + _offset);
+  }
+
+  @override
+  bool get isRepaintBoundary => true;
+}