Files
sepot/app/lib/features/conversation/image_viewer_screen.dart
T
Julius Joska 5246a97db2 feat(app): redesigned interface, polls, drafts, forwarding and mentions
A new look across the app and a set of everyday messaging features.

Interface
- Home screen with Chats, Contacts and Settings tabs, a large title,
  search across chats and message text (diacritics-insensitive), filters
  and pinned chats.
- Conversation view with a translucent header and composer, grouped
  bubbles, author avatars and colours in groups, swipe to reply, an
  "N new messages" marker, a jump-to-latest button and in-chat search.
- Contact and group profiles: verification, shared photos, groups in
  common, disappearing messages, mute, block; members, admin badges,
  adding people, rename and leave for groups.
- Full-screen photo viewer that pages through the whole conversation.
- A stable avatar colour per person and a clearly visible read state.

Messaging
- Polls in chats and groups, single or multiple choice, with votes that
  can be changed or withdrawn; older clients see them as text.
- Drafts survive leaving a chat and show in the chat list.
- Forwarding of messages, photos, files and voice messages.
- Notes to self: a local-only, encrypted chat that never reaches the
  relay.
- @mentions in groups that notify even when the group is muted.
- Typing indicators sent as ephemeral messages, opt-in and mutual like
  read receipts.
- Delivery and read times per message and per group member.
- Profile photos, cropped, resized and stripped of metadata, delivered
  encrypted to contacts.
- Voice message playback at 1.5x and 2x.
- Call buttons in 1:1 chats and call log entries.

Fixes
- Muted groups no longer notify: muting was checked against the
  author's chat instead of the group.
- A blocked contact could unblock itself by changing its delivery
  address.
- Read receipts no longer regress to delivered when a late delivery
  receipt arrives.
- A message marked as failed corrects itself once it is delivered.
- Double ticks in groups now mean delivered to every member.
2026-10-03 22:44:53 +02:00

309 lines
11 KiB
Dart

/// Fotky konverzace přes celou obrazovku — listování, přiblížení, sdílení.
///
/// Plné rozlišení se dešifruje až tady, do PAMĚTI (na disk nikdy).
/// FLAG_SECURE platí globálně, takže screenshot/škrcení obrazovky
/// nehrozí ani ve vieweru. Sdílení jde přes systémový share sheet
/// (XFile.fromData — plaintext jen v cache sdílení).
library;
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:intl/intl.dart';
import 'package:sepot/core/l10n/l10n.dart';
import 'package:sepot/core/theme/app_theme.dart';
import 'package:sepot/models/attachment.dart';
import 'package:sepot/models/message.dart';
import 'package:sepot/providers/contacts_provider.dart';
import 'package:sepot/providers/identity_provider.dart';
import 'package:sepot/providers/messaging_provider.dart';
import 'package:sepot/widgets/avatar.dart';
import 'package:sepot/widgets/glass.dart';
import 'package:share_plus/share_plus.dart';
/// Fotky zprávy, které jde otevřít: stažené obrázky, ne smazané.
bool isViewableImage(Message m) =>
!m.isDeleted &&
m.type == MessageType.image &&
m.attachment?.state == AttachmentTransferState.ready;
class ImageViewerScreen extends ConsumerStatefulWidget {
const ImageViewerScreen({
super.key,
required this.images,
this.initialIndex = 0,
});
/// Fotky od nejstarší po nejnovější (pořadí jako v chatu).
final List<Message> images;
final int initialIndex;
/// Otevře fotku [message] a nabídne listování ostatními z [all].
static Future<void> open(
BuildContext context, Message message, List<Message> all) {
final images = all.where(isViewableImage).toList();
var index = images.indexWhere((m) => m.id == message.id);
if (index < 0) {
images
..clear()
..add(message);
index = 0;
}
return Navigator.of(context).push(
PageRouteBuilder<void>(
opaque: false,
pageBuilder: (_, _, _) =>
ImageViewerScreen(images: images, initialIndex: index),
transitionsBuilder: (_, anim, _, child) =>
FadeTransition(opacity: anim, child: child),
),
);
}
@override
ConsumerState<ImageViewerScreen> createState() => _ImageViewerScreenState();
}
class _ImageViewerScreenState extends ConsumerState<ImageViewerScreen> {
late final _pages = PageController(initialPage: widget.initialIndex);
late int _index = widget.initialIndex;
final _decrypted = <String, Future<Uint8List?>>{};
bool _chrome = true;
@override
void dispose() {
_pages.dispose();
super.dispose();
}
Future<Uint8List?> _load(Message m) => _decrypted.putIfAbsent(
m.id,
() => ref.read(messagingServiceProvider).loadDecryptedAttachment(m));
Message get _current => widget.images[_index];
Future<void> _share() async {
final meta = _current.attachment!;
final ext = meta.mime == 'image/png'
? 'png'
: meta.mime == 'image/gif'
? 'gif'
: 'jpg';
final name = context.l10n.attachmentSharedImageFilename(ext);
final bytes = await _load(_current);
if (bytes == null) return;
await Share.shareXFiles([
XFile.fromData(bytes, name: name, mimeType: meta.mime),
]);
}
String _senderName(Message m) {
final me = ref.read(identityProvider).valueOrNull;
if (m.senderId == me?.id) return context.l10n.groupsYou;
final contact = (ref.read(contactsProvider).valueOrNull ?? const [])
.where((c) => c.publicIdentity.id == m.senderId)
.firstOrNull;
return contact?.displayName.isNotEmpty == true
? contact!.displayName
: context.l10n.commonUnknownContact;
}
@override
Widget build(BuildContext context) {
final m = _current;
final locale = Localizations.localeOf(context).toString();
final when =
'${DateFormat.MMMd(locale).format(m.timestamp)} ${DateFormat.Hm(locale).format(m.timestamp)}';
final total = widget.images.length;
return AnnotatedRegion<SystemUiOverlayStyle>(
value: SystemUiOverlayStyle.light,
child: Scaffold(
backgroundColor: Colors.black,
body: Stack(
children: [
Positioned.fill(
child: GestureDetector(
onTap: () => setState(() => _chrome = !_chrome),
child: PageView.builder(
controller: _pages,
itemCount: total,
onPageChanged: (i) => setState(() => _index = i),
itemBuilder: (context, i) => _Page(future: _load(widget.images[i])),
),
),
),
AnimatedPositioned(
duration: const Duration(milliseconds: 200),
top: _chrome ? 0 : -140,
left: 0,
right: 0,
child: GlassSurface(
border: false,
padding: EdgeInsets.fromLTRB(
4, MediaQuery.paddingOf(context).top + 6, 8, 10),
child: Row(
children: [
IconButton(
tooltip: MaterialLocalizations.of(context)
.closeButtonTooltip,
icon: const Icon(Icons.close_rounded),
onPressed: () => Navigator.of(context).pop(),
),
SepotAvatar(name: _senderName(m), seed: m.senderId, size: 34),
const SizedBox(width: 10),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(_senderName(m),
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: const TextStyle(
fontSize: 15, fontWeight: FontWeight.w600)),
Text(
total > 1
? '$when · ${context.l10n.chatSearchCounter(_index + 1, total)}'
: when,
style: const TextStyle(
fontSize: 12,
color: SepotColors.textEmphasis),
),
],
),
),
IconButton(
tooltip: context.l10n.commonShare,
icon: const Icon(Icons.ios_share_rounded),
onPressed: _share,
),
],
),
),
),
AnimatedPositioned(
duration: const Duration(milliseconds: 200),
bottom: _chrome ? 0 : -220,
left: 0,
right: 0,
child: (m.content?.isNotEmpty == true || total > 1)
? GlassSurface(
border: false,
padding: EdgeInsets.fromLTRB(
16, 12, 16, MediaQuery.paddingOf(context).bottom + 14),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: [
if (m.content?.isNotEmpty == true)
Padding(
padding: const EdgeInsets.only(bottom: 12),
child: Text(m.content!,
style: const TextStyle(
fontSize: 15, height: 1.4)),
),
if (total > 1)
SizedBox(
height: 48,
child: ListView.separated(
scrollDirection: Axis.horizontal,
itemCount: total,
separatorBuilder: (_, _) =>
const SizedBox(width: 6),
itemBuilder: (context, i) => _Thumb(
message: widget.images[i],
selected: i == _index,
onTap: () => _pages.animateToPage(i,
duration:
const Duration(milliseconds: 250),
curve: Curves.easeOutCubic),
),
),
),
],
),
)
: const SizedBox.shrink(),
),
],
),
),
);
}
}
class _Page extends StatelessWidget {
const _Page({required this.future});
final Future<Uint8List?> future;
@override
Widget build(BuildContext context) {
return FutureBuilder<Uint8List?>(
future: future,
builder: (context, snapshot) {
if (snapshot.connectionState != ConnectionState.done) {
return const Center(
child: CircularProgressIndicator(color: SepotColors.ember),
);
}
final bytes = snapshot.data;
if (snapshot.hasError || bytes == null) {
return Center(
child: Text(
context.l10n.attachmentDecryptFailed,
style: const TextStyle(color: Colors.white70),
),
);
}
return InteractiveViewer(
maxScale: 6,
child: Center(child: Image.memory(bytes, fit: BoxFit.contain)),
);
},
);
}
}
/// Náhled v pásu dole — stačí malý náhled, který přišel uvnitř E2E zprávy.
class _Thumb extends StatelessWidget {
const _Thumb({
required this.message,
required this.selected,
required this.onTap,
});
final Message message;
final bool selected;
final VoidCallback onTap;
@override
Widget build(BuildContext context) {
final thumb = message.attachment?.thumbnail;
return GestureDetector(
onTap: onTap,
child: AnimatedContainer(
duration: const Duration(milliseconds: 160),
width: 48,
height: 48,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10),
border: Border.all(
color: selected ? SepotColors.ember : Colors.transparent,
width: 2,
),
),
child: ClipRRect(
borderRadius: BorderRadius.circular(8),
child: Opacity(
opacity: selected ? 1 : 0.6,
child: thumb != null
? Image.memory(thumb, fit: BoxFit.cover, gaplessPlayback: true)
: const ColoredBox(color: SepotColors.surfaceVariant),
),
),
),
);
}
}