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indexed_stack_lazy.dart
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indexed_stack_lazy.dart
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TabBar tabBar = TabBar(
controller: tabController,
isScrollable: true,
indicator: const UnderlineTabIndicator(),
tabs: openedTabPageList.map<Tab>((TabPage? tabPage) {
var tabContent = Row(
children: <Widget>[
Text(Utils.isLocalEn(context)
? tabPage!.nameEn ?? ''
: tabPage!.name ?? ''),
if (!defaultTabs.contains(tabPage))
Material(
type: MaterialType.transparency,
child: SizedBox(
width: 25,
child: IconButton(
iconSize: 10,
splashRadius: 10,
onPressed: () => Utils.closeTab(tabPage),
icon: Icon(Icons.close),
),
),
)
],
);
return Tab(
child: CryMenu(
child: tabContent,
onSelected: (dynamic v) {
switch (v) {
case TabMenuOption.close:
Utils.closeTab(tabPage);
break;
case TabMenuOption.closeAll:
Utils.closeAllTab();
break;
case TabMenuOption.closeOthers:
Utils.closeOtherTab(tabPage);
break;
case TabMenuOption.closeAllToTheRight:
Utils.closeAllToTheRightTab(tabPage);
break;
case TabMenuOption.closeAllToTheLeft:
Utils.closeAllToTheLeftTab(tabPage);
break;
}
},
// itemBuilder: (context) => <PopupMenuEntry<TabMenuOption>>[
// if (!defaultTabs.contains(tabPage))
// PopupMenuItem(
// value: TabMenuOption.close,
// child: ListTile(
// title: Text('Close'),
// ),
// ),
// PopupMenuItem(
// value: TabMenuOption.closeAll,
// child: ListTile(
// title: Text('Close All'),
// ),
// ),
// PopupMenuItem(
// value: TabMenuOption.closeOthers,
// child: ListTile(
// title: Text('Close Others'),
// ),
// ),
// PopupMenuItem(
// value: TabMenuOption.closeAllToTheRight,
// child: ListTile(
// title: Text('Close All to the Right'),
// ),
// ),
// PopupMenuItem(
// value: TabMenuOption.closeAllToTheLeft,
// child: ListTile(
// title: Text('Close All to the Left'),
// ),
// ),
// ],
),
);
}).toList(),
);
var content = Container(
child: Expanded(
child: IndexedStackLazy(
index: currentIndex,
children: openedTabPageList.map((TabPage? tabPage) {
var page = tabPage!.url != null
? Routes.layoutPagesMap[tabPage.url!] ?? Container()
: tabPage.widget ?? Container();
return KeyedSubtree(
child: page,
key: Key('page-${tabPage.id}'),
);
}).toList(),
),
),
);
var result = Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Container(
color: context.theme.primaryColor,
child: Row(
children: <Widget>[
Expanded(child: tabBar),
IconButton(
onPressed: () => layoutController.toggleMaximize(),
icon: Icon(layoutController.isMaximize
? Icons.close_fullscreen
: Icons.open_in_full),
iconSize: 20,
color: Colors.white,
)
],
),
),
content,
],
),
);
return result;
}
}
import 'package:flutter/material.dart';
class IndexedStackLazy extends StatefulWidget {
final int index;
final List<Widget> children;
IndexedStackLazy({Key? key, this.index = 0, required this.children}) : super(key: key);
@override
_IndexedStackLazyState createState() => _IndexedStackLazyState();
}
class _IndexedStackLazyState extends State<IndexedStackLazy> {
List<Widget> children = <Widget>[];
int index = 0;
@override
void initState() {
children.add(widget.children[widget.index]);
super.initState();
}
@override
void didUpdateWidget(covariant IndexedStackLazy oldWidget) {
List<Widget> newChildren = <Widget>[];
for (int i = 0; i < widget.children.length; i++) {
var w = widget.children[i];
var existIndex = children.indexWhere((element) => element.key == w.key);
if (existIndex > -1) {
newChildren.add(children[existIndex]);
if (widget.index == i) {
index = newChildren.length - 1;
}
} else if (widget.index == i) {
newChildren.add(w);
index = newChildren.length - 1;
}
}
children = newChildren;
super.didUpdateWidget(oldWidget);
}
@override
Widget build(BuildContext context) {
return IndexedStack(
index: index,
children: children,
);
}
}