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import ' package:flutter/material.dart ' ;
import ' package:infinite_scroll_pagination/infinite_scroll_pagination.dart ' ;
import ' package:provider/provider.dart ' ;
import ' package:simplecloudnotifier/api/api_client.dart ' ;
import ' package:simplecloudnotifier/models/channel.dart ' ;
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import ' package:simplecloudnotifier/pages/channel_view/channel_view.dart ' ;
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import ' package:simplecloudnotifier/state/app_bar_state.dart ' ;
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import ' package:simplecloudnotifier/state/application_log.dart ' ;
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import ' package:simplecloudnotifier/state/app_auth.dart ' ;
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import ' package:simplecloudnotifier/pages/channel_list/channel_list_item.dart ' ;
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import ' package:simplecloudnotifier/utils/navi.dart ' ;
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class ChannelRootPage extends StatefulWidget {
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const ChannelRootPage ( { super . key , required this . isVisiblePage } ) ;
final bool isVisiblePage ;
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@ override
State < ChannelRootPage > createState ( ) = > _ChannelRootPageState ( ) ;
}
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class _ChannelRootPageState extends State < ChannelRootPage > with RouteAware {
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final PagingController < int , ChannelWithSubscription > _pagingController = PagingController . fromValue ( PagingState ( nextPageKey: null , itemList: [ ] , error: null ) , firstPageKey: 0 ) ;
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bool _isInitialized = false ;
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bool _reloadEnqueued = false ;
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@ override
void initState ( ) {
super . initState ( ) ;
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_pagingController . addPageRequestListener ( _fetchPage ) ;
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if ( widget . isVisiblePage & & ! _isInitialized ) _realInitState ( ) ;
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}
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@ override
void didChangeDependencies ( ) {
super . didChangeDependencies ( ) ;
Navi . modalRouteObserver . subscribe ( this , ModalRoute . of ( context ) ! ) ;
}
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@ override
void dispose ( ) {
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ApplicationLog . debug ( ' ChannelRootPage::dispose ' ) ;
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_pagingController . dispose ( ) ;
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Navi . modalRouteObserver . unsubscribe ( this ) ;
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super . dispose ( ) ;
}
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@ override
void didUpdateWidget ( ChannelRootPage oldWidget ) {
super . didUpdateWidget ( oldWidget ) ;
if ( oldWidget . isVisiblePage ! = widget . isVisiblePage & & widget . isVisiblePage ) {
if ( ! _isInitialized ) {
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_realInitState ( ) ;
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} else {
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_backgroundRefresh ( ) ;
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}
}
}
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@ override
void didPush ( ) {
// ...
}
@ override
void didPopNext ( ) {
if ( _reloadEnqueued ) {
ApplicationLog . debug ( ' [ChannelList::RouteObserver] --> didPopNext (will background-refresh) (_reloadEnqueued == true) ' ) ;
( ) async {
_reloadEnqueued = false ;
AppBarState ( ) . setLoadingIndeterminate ( true ) ;
await Future . delayed ( const Duration ( milliseconds: 500 ) ) ; // prevents flutter bug where the whole process crashes ?!?
await _backgroundRefresh ( ) ;
} ( ) ;
}
}
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void _realInitState ( ) {
ApplicationLog . debug ( ' ChannelRootPage::_realInitState ' ) ;
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_pagingController . refresh ( ) ;
_isInitialized = true ;
}
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Future < void > _fetchPage ( int pageKey ) async {
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final acc = Provider . of < AppAuth > ( context , listen: false ) ;
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ApplicationLog . debug ( ' Start ChannelList::_pagingController::_fetchPage [ ${ pageKey } ] ' ) ;
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if ( ! acc . isAuth ( ) ) {
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_pagingController . error = ' Not logged in ' ;
return ;
}
try {
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final items = ( await APIClient . getChannelList ( acc , ChannelSelector . all ) ) . toList ( ) ;
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items . sort ( ( a , b ) = > - 1 * ( a . channel . timestampLastSent ? ? ' ' ) . compareTo ( b . channel . timestampLastSent ? ? ' ' ) ) ;
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_pagingController . value = PagingState ( nextPageKey: null , itemList: items , error: null ) ;
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} catch ( exc , trace ) {
_pagingController . error = exc . toString ( ) ;
ApplicationLog . error ( ' Failed to list channels: ' + exc . toString ( ) , trace: trace ) ;
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}
}
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Future < void > _backgroundRefresh ( ) async {
final acc = Provider . of < AppAuth > ( context , listen: false ) ;
ApplicationLog . debug ( ' Start background refresh of channel list ' ) ;
if ( ! acc . isAuth ( ) ) {
_pagingController . error = ' Not logged in ' ;
return ;
}
try {
await Future . delayed ( const Duration ( seconds: 0 ) , ( ) { } ) ; // this is annoyingly important - otherwise we call setLoadingIndeterminate directly in initStat() and get an exception....
AppBarState ( ) . setLoadingIndeterminate ( true ) ;
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final items = ( await APIClient . getChannelList ( acc , ChannelSelector . all ) ) . toList ( ) ;
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items . sort ( ( a , b ) = > - 1 * ( a . channel . timestampLastSent ? ? ' ' ) . compareTo ( b . channel . timestampLastSent ? ? ' ' ) ) ;
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setState ( ( ) {
_pagingController . value = PagingState ( nextPageKey: null , itemList: items , error: null ) ;
} ) ;
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} catch ( exc , trace ) {
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setState ( ( ) {
_pagingController . error = exc . toString ( ) ;
} ) ;
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ApplicationLog . error ( ' Failed to list channels: ' + exc . toString ( ) , trace: trace ) ;
} finally {
AppBarState ( ) . setLoadingIndeterminate ( false ) ;
}
}
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@ override
Widget build ( BuildContext context ) {
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return RefreshIndicator (
onRefresh: ( ) = > Future . sync (
( ) = > _pagingController . refresh ( ) ,
) ,
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child: PagedListView < int , ChannelWithSubscription > (
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pagingController: _pagingController ,
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builderDelegate: PagedChildBuilderDelegate < ChannelWithSubscription > (
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itemBuilder: ( context , item , index ) = > ChannelListItem (
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channel: item . channel ,
subscription: item . subscription ,
onPressed: ( ) {
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Navi . push ( context , ( ) = > ChannelViewPage ( channel: item . channel , subscription: item . subscription , needsReload: _enqueueReload ) ) ;
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} ,
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) ,
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) ,
) ,
) ;
}
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void _enqueueReload ( ) {
_reloadEnqueued = true ;
}
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}