mirror of
https://github.com/GitJournal/GitJournal.git
synced 2025-07-15 07:56:11 +08:00
ebff34b753
It's not great, as the granularity is too low. But it's a good first step. It only works in the RawEditor so far.
58 lines
1.4 KiB
Dart
58 lines
1.4 KiB
Dart
import 'dart:math';
|
|
|
|
import 'package:gitjournal/editors/common.dart';
|
|
|
|
// FIXME: Possibly conserve memory by only storing the difference between the
|
|
// texts? Or by saving it to disk?
|
|
|
|
// FIXME: This should probably also have what field was changed?
|
|
// How does this work for the title and the checklist editor?
|
|
|
|
// FIXME: Instead of storing if each note has been modified that should be
|
|
// be just taken from this class
|
|
//
|
|
class UndoRedoStack {
|
|
var _versions = <TextEditorState>[];
|
|
int _index = -1;
|
|
|
|
/// Returns if UI should be redrawn
|
|
bool textChanged(TextEditorState es) {
|
|
var _redo = redoPossible;
|
|
var _undo = undoPossible;
|
|
if (_redo) {
|
|
var i = max(0, _index);
|
|
_versions.removeRange(i, _versions.length - 1);
|
|
}
|
|
if (_versions.isEmpty) {
|
|
_versions.add(es);
|
|
_index = _versions.length - 1;
|
|
return true;
|
|
}
|
|
var last = _versions.last;
|
|
if (last.text == es.text) {
|
|
return false;
|
|
}
|
|
_versions.add(es);
|
|
_index = _versions.length - 1;
|
|
|
|
return redoPossible != _redo || undoPossible != _undo;
|
|
}
|
|
|
|
TextEditorState undo() {
|
|
var i = _index;
|
|
_index--;
|
|
return _versions[i];
|
|
}
|
|
|
|
TextEditorState redo() {
|
|
_index++;
|
|
return _versions[_index];
|
|
}
|
|
|
|
bool get undoPossible => _index >= 0;
|
|
bool get redoPossible => _index < _versions.length - 1;
|
|
bool get modified => _versions.isNotEmpty;
|
|
}
|
|
|
|
// FIXME: Only save it every x seconds?
|