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Media viewer: Edit/Preview and Save move to the top bar

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A TextPreviewController (owned by the viewer, bound by MediaTextPreview)
mirrors the editing/dirty/saving state out so the top bar draws the buttons;
Save shows a spinner while saving. Located and tested via a Codex consult
(its end-to-end widget test, with the provider fixed and the saving state
adapted); the controller design replaces its builder-wrapping patch.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
Ayushya Amitabh
2026-10-06 20:38:19 -04:00
co-authored by Claude Sonnet 5.5
parent 4ab6c5d85c
commit 5fa20ff3e9
4 changed files with 369 additions and 34 deletions
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lib/widgets/viewer/media_text_preview.dart
+111 -31
View File
@@ -2,11 +2,9 @@ import 'dart:convert';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';
import '../../models/nextcloud_item.dart';
import '../../providers/session_controller.dart';
import '../../theme/design_tokens.dart';
import '../noo/core/noo_button.dart';
/// Space the viewer's floating top bar and bottom action bar cover, so the
/// text sits clear of them (and the status bar) instead of scrolling
@@ -14,16 +12,96 @@ import '../noo/core/noo_button.dart';
const double _kTopBarClearance = 72;
const double _kActionBarClearance = 112;
/// What the viewer's top bar needs from [MediaTextPreview]: whether to show
/// the Edit/Preview toggle and the Save button, their current state, and a way
/// to trigger them. The preview owns the text, the editing mode and the save;
/// this just mirrors that out so `FileViewerScreen` can draw the buttons in
/// its own top bar (they used to float inside the preview).
class TextPreviewController extends ChangeNotifier {
bool _canToggleEditing = false;
bool _editing = false;
bool _dirty = false;
bool _saving = false;
bool _disposed = false;
VoidCallback? _onToggleEditing;
Future<void> Function()? _onSave;
/// Markdown, writable (not the read-only Offline copy) and loaded - the
/// Edit/Preview toggle only exists then.
bool get canToggleEditing => _canToggleEditing;
/// Markdown is currently showing its raw text (the toggle then offers
/// "Preview"); false while rendered (it offers "Edit").
bool get editing => _editing;
/// The text differs from what's saved on the server.
bool get dirty => _dirty;
bool get saving => _saving;
/// The Save button is shown once the content has changed, and stays (as a
/// spinner) while the save is in flight.
bool get showSave => _dirty || _saving;
void toggleEditing() => _onToggleEditing?.call();
Future<void> save() async => _onSave?.call();
void _bind(VoidCallback toggleEditing, Future<void> Function() save) {
_onToggleEditing = toggleEditing;
_onSave = save;
}
/// The preview went away: nothing to toggle or save any more. Quiet (no
/// notification) - it happens while the tree is being torn down.
void _unbind() {
_onToggleEditing = null;
_onSave = null;
_canToggleEditing = false;
_editing = false;
_dirty = false;
_saving = false;
}
void _update({
required bool canToggleEditing,
required bool editing,
required bool dirty,
required bool saving,
}) {
if (_canToggleEditing == canToggleEditing &&
_editing == editing &&
_dirty == dirty &&
_saving == saving) {
return;
}
_canToggleEditing = canToggleEditing;
_editing = editing;
_dirty = dirty;
_saving = saving;
if (!_disposed) notifyListeners();
}
@override
void dispose() {
_disposed = true;
super.dispose();
}
}
/// Text/markdown file preview and editor for [FileViewerScreen]'s static
/// (non-swipeable) path (`_textPreviewExtensions`). Content is always
/// editable when online; a Save button appears once it has changed. Markdown
/// files open rendered, with an Edit/Preview toggle. Opened
/// from the Offline tab ([localPathResolver] set) it is read-only, since the
/// local copy has no server to write back to.
/// editable when online; Save appears once it has changed. Markdown files open
/// rendered, with an Edit/Preview toggle. Both controls live in the viewer's
/// top bar, driven through [controller]. Opened from the Offline tab
/// ([localPathResolver] set) it is read-only, since the local copy has no
/// server to write back to.
class MediaTextPreview extends StatefulWidget {
final NextcloudItem item;
final SessionController session;
/// Receives this preview's editing/save state and is how the top bar's
/// buttons reach it. Optional so the preview also works on its own.
final TextPreviewController? controller;
/// When set, read bytes from the local path it resolves to instead of
/// fetching from the server - see
/// `FileViewerScreen.localPathResolver`'s doc comment.
@@ -33,6 +111,7 @@ class MediaTextPreview extends StatefulWidget {
super.key,
required this.item,
required this.session,
this.controller,
this.localPathResolver,
});
@@ -60,16 +139,38 @@ class _MediaTextPreviewState extends State<MediaTextPreview> {
@override
void initState() {
super.initState();
_controller.addListener(() => setState(() {}));
widget.controller?._bind(_toggleEditing, _save);
_controller.addListener(() {
setState(() {});
_syncToolbar();
});
_load();
}
@override
void dispose() {
widget.controller?._unbind();
_controller.dispose();
super.dispose();
}
/// Mirrors the editing/save state out to the viewer's top bar. Only called
/// from event handlers and async completions - never from build or
/// initState, where notifying the bar's listeners would be illegal.
void _syncToolbar() {
widget.controller?._update(
canToggleEditing: _saved != null && _isMarkdown && !_readOnly,
editing: _editing,
dirty: _dirty,
saving: _isSaving,
);
}
void _toggleEditing() {
setState(() => _editing = !_editing);
_syncToolbar();
}
Future<void> _load() async {
try {
final List<int> bytes;
@@ -89,6 +190,7 @@ class _MediaTextPreviewState extends State<MediaTextPreview> {
final text = utf8.decode(bytes, allowMalformed: true);
_controller.text = text;
setState(() => _saved = text);
_syncToolbar();
}
} catch (e) {
if (mounted) setState(() => _error = e.toString());
@@ -99,6 +201,7 @@ class _MediaTextPreviewState extends State<MediaTextPreview> {
final messenger = ScaffoldMessenger.of(context);
final text = _controller.text;
setState(() => _isSaving = true);
_syncToolbar();
var ok = false;
try {
ok = await widget.session.service!.putBytes(
@@ -111,6 +214,7 @@ class _MediaTextPreviewState extends State<MediaTextPreview> {
_isSaving = false;
if (ok) _saved = text;
});
_syncToolbar();
messenger.showSnackBar(
SnackBar(
content: Text(ok ? 'Saved ${widget.item.name}' : 'Could not save file'),
@@ -171,30 +275,6 @@ class _MediaTextPreviewState extends State<MediaTextPreview> {
),
),
),
if (_isMarkdown && !_readOnly)
Positioned(
right: 20,
top: safe.top + _kTopBarClearance - 8,
child: NooButton(
variant: NooButtonVariant.tonal,
size: NooButtonSize.compact,
icon: _editing ? LucideIcons.eye : LucideIcons.pencil,
onTap: () => setState(() => _editing = !_editing),
child: Text(_editing ? 'Preview' : 'Edit'),
),
),
if (_dirty)
Positioned(
right: 20,
bottom: safe.bottom + _kActionBarClearance,
child: NooButton(
size: NooButtonSize.card,
icon: LucideIcons.save,
disabled: _isSaving,
onTap: _isSaving ? null : _save,
child: Text(_isSaving ? 'Saving…' : 'Save'),
),
),
],
),
);