zefyr/packages/zefyr/lib/src/widgets/scaffold.dart

import 'package:flutter/material.dart';

import 'editor.dart';

/// Provides necessary layout for [ZefyrEditor].
class ZefyrScaffold extends StatefulWidget {
  final Widget child;

  const ZefyrScaffold({Key key, this.child}) : super(key: key);

  static ZefyrScaffoldState of(BuildContext context) {
    final _ZefyrScaffoldAccess widget =
        context.dependOnInheritedWidgetOfExactType<_ZefyrScaffoldAccess>();
    return widget.scaffold;
  }

  @override
  ZefyrScaffoldState createState() => ZefyrScaffoldState();
}

class ZefyrScaffoldState extends State<ZefyrScaffold> {
  WidgetBuilder _toolbarBuilder;

  void showToolbar(WidgetBuilder builder) {
    setState(() {
      _toolbarBuilder = builder;
    });
  }

  void hideToolbar(WidgetBuilder builder) {
    if (_toolbarBuilder == builder) {
      setState(() {
        _toolbarBuilder = null;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    final toolbar =
        (_toolbarBuilder == null) ? Container() : _toolbarBuilder(context);
    // return Container(
    //   margin: EdgeInsets.only(
    //     bottom: MediaQuery.of(context).viewInsets.bottom > 0
    //         ? MediaQuery.of(context).viewInsets.bottom
    //         : 0,
    //   ),
    //   child: _ZefyrScaffoldAccess(
    //     scaffold: this,
    //     child: Column(
    //       children: <Widget>[
    //         Expanded(child: widget.child),
    //         toolbar,
    //       ],
    //     ),
    //   ),
    // );
    return _ZefyrScaffoldAccess(
        scaffold: this,
        child: Column(
          children: <Widget>[
            Expanded(child: widget.child),
            toolbar,
          ],
        ),
      );
  }
}

class _ZefyrScaffoldAccess extends InheritedWidget {
  final ZefyrScaffoldState scaffold;

  _ZefyrScaffoldAccess({Widget child, this.scaffold}) : super(child: child);

  @override
  bool updateShouldNotify(_ZefyrScaffoldAccess oldWidget) {
    return oldWidget.scaffold != scaffold;
  }
}