get_state.dart
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import 'package:flutter/material.dart';
import '../get_main.dart';
class GetController extends State {
Map<GetController, State> _allStates = {};
/// Update GetBuilder with update(this)
void update(GetController id) {
if (id != null) {
final State state = _allStates[id];
if (state != null && state.mounted) state.setState(() {});
}
}
@override
Widget build(_) => throw ("build method can't be called");
}
class GetBuilder<T extends GetController> extends StatefulWidget {
@required
final Widget Function(T) builder;
final bool global;
final bool autoRemove;
final void Function(State state) initState, dispose, didChangeDependencies;
final void Function(GetBuilder oldWidget, State state) didUpdateWidget;
final T init;
GetBuilder({
Key key,
this.init,
this.global = true,
this.builder,
this.autoRemove = true,
this.initState,
this.dispose,
this.didChangeDependencies,
this.didUpdateWidget,
}) : assert(builder != null),
super(key: key);
@override
_GetBuilderState<T> createState() => _GetBuilderState<T>();
}
class _GetBuilderState<T extends GetController> extends State<GetBuilder<T>> {
T controller;
@override
void initState() {
super.initState();
if (widget.global) {
if (Get.isRegistred<T>()) {
controller = Get.find<T>();
} else {
controller = widget.init;
controller._allStates[controller] = this;
Get.put(controller);
}
} else {
controller = widget.init;
controller._allStates[controller] = this;
}
if (widget.initState != null) widget.initState(this);
}
@override
void dispose() {
if (widget.init != null) {
var b = controller;
if (b._allStates[controller].hashCode == this.hashCode) {
b._allStates.remove(controller);
}
}
if (widget.dispose != null) widget.dispose(this);
if (widget.autoRemove && Get.isRegistred<T>() && (widget.init != null)) {
Get.delete(widget.init);
}
super.dispose();
}
@override
void didChangeDependencies() {
super.didChangeDependencies();
if (widget.didChangeDependencies != null)
widget.didChangeDependencies(this);
}
@override
void didUpdateWidget(GetBuilder oldWidget) {
super.didUpdateWidget(oldWidget);
if (widget.didUpdateWidget != null) widget.didUpdateWidget(oldWidget, this);
}
@override
Widget build(BuildContext context) {
return widget.builder(controller);
}
}