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c4ef1f569b
Instead of picking lint values. This way I don't need to routinely looking at extra lints to enable.
64 lines
1.5 KiB
Dart
64 lines
1.5 KiB
Dart
/*
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* SPDX-FileCopyrightText: 2019-2021 Vishesh Handa <me@vhanda.in>
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*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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import 'dart:math';
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import 'package:gitjournal/editors/common.dart';
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// FIXME: Possibly conserve memory by only storing the difference between the
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// texts? Or by saving it to disk?
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// FIXME: This should probably also have what field was changed?
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// How does this work for the title and the checklist editor?
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// FIXME: Instead of storing if each note has been modified that should be
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// be just taken from this class
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//
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class UndoRedoStack {
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final _versions = <TextEditorState>[];
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int _index = -1;
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/// Returns if UI should be redrawn
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bool textChanged(TextEditorState es) {
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var _redo = redoPossible;
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var _undo = undoPossible;
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if (_redo) {
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var i = max(0, _index);
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_versions.removeRange(i, _versions.length - 1);
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}
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if (_versions.isEmpty) {
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_versions.add(es);
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_index = _versions.length - 1;
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return true;
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}
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var last = _versions.last;
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if (last.text == es.text) {
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return false;
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}
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_versions.add(es);
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_index = _versions.length - 1;
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return redoPossible != _redo || undoPossible != _undo;
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}
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TextEditorState undo() {
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var i = _index;
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_index--;
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return _versions[i];
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}
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TextEditorState redo() {
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_index++;
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return _versions[_index];
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}
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bool get undoPossible => _index >= 0;
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bool get redoPossible => _index < _versions.length - 1;
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bool get modified => _versions.isNotEmpty;
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}
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// FIXME: Only save it every x seconds?
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