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// ParentWidget manages the state for TapboxB.
//------------------------ ParentWidget --------------------------------
class ParentWidget extends StatefulWidget {
const ParentWidget({super.key});
@override
State<ParentWidget> createState() => _ParentWidgetState();
}
class _ParentWidgetState extends State<ParentWidget> {
bool _active = false;
void _handleTapboxChanged(bool newValue) {
setState(() {
_active = newValue;
});
}
@override
Widget build(BuildContext context) {
return SizedBox(
child: TapboxB(
active: _active,
onChanged: _handleTapboxChanged,
),
);
}
}
//------------------------- TapboxB ----------------------------------
class TapboxB extends StatelessWidget {
const TapboxB({
super.key,
this.active = false,
required this.onChanged,
});
final bool active;
final ValueChanged<bool> onChanged;
void _handleTap() {
onChanged(!active);
}
@override
Widget build(BuildContext context) {
return GestureDetector(
onTap: _handleTap,
child: Container(
width: 200,
height: 200,
decoration: BoxDecoration(
color: active ? Colors.lightGreen[700] : Colors.grey[600],
),
child: Center(
child: Text(
active ? 'Active' : 'Inactive',
style: const TextStyle(fontSize: 32, color: Colors.white),
),
),
),
);
}
}<code_end>
<topic_end>
<topic_start>
A mix-and-match approach
For some widgets, a mix-and-match approach makes
the most sense. In this scenario, the stateful widget
manages some of the state, and the parent widget
manages other aspects of the state.In the TapboxC example, on tap down,
a dark green border appears around the box. On tap up,
the border disappears and the box’s color changes. TapboxC
exports its _active state to its parent but manages its
_highlight state internally. This example has two State
objects, _ParentWidgetState and _TapboxCState.The _ParentWidgetState object:The _TapboxCState object:
<code_start>import 'package:flutter/material.dart';
//---------------------------- ParentWidget ----------------------------
class ParentWidget extends StatefulWidget {
const ParentWidget({super.key});
@override
State<ParentWidget> createState() => _ParentWidgetState();
}
class _ParentWidgetState extends State<ParentWidget> {
bool _active = false;
void _handleTapboxChanged(bool newValue) {
setState(() {
_active = newValue;
});
}
@override
Widget build(BuildContext context) {
return SizedBox(
child: TapboxC(
active: _active,
onChanged: _handleTapboxChanged,
),
);
}
}
//----------------------------- TapboxC ------------------------------
class TapboxC extends StatefulWidget {
const TapboxC({
super.key,
this.active = false,
required this.onChanged,
});
final bool active;