blob: 02b7bd307c8c43d32f5389cee2c53bb88744011c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
// Scintilla source code edit control
/** @file UndoHistory.h
** Manages undo for the document.
**/
// Copyright 1998-2024 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#ifndef UNDOHISTORY_H
#define UNDOHISTORY_H
namespace Scintilla::Internal {
/**
*
*/
class UndoHistory {
std::vector<Action> actions;
int maxAction;
int currentAction;
int undoSequenceDepth;
int savePoint;
int tentativePoint;
std::optional<int> detach;
void EnsureUndoRoom();
public:
UndoHistory();
const char *AppendAction(ActionType at, Sci::Position position, const char *data, Sci::Position lengthData, bool &startSequence, bool mayCoalesce=true);
void BeginUndoAction();
void EndUndoAction();
void DropUndoSequence() noexcept;
void DeleteUndoHistory();
/// The save point is a marker in the undo stack where the container has stated that
/// the buffer was saved. Undo and redo can move over the save point.
void SetSavePoint() noexcept;
bool IsSavePoint() const noexcept;
bool BeforeSavePoint() const noexcept;
bool BeforeReachableSavePoint() const noexcept;
bool AfterSavePoint() const noexcept;
bool AfterDetachPoint() const noexcept;
// Tentative actions are used for input composition so that it can be undone cleanly
void TentativeStart() noexcept;
void TentativeCommit() noexcept;
bool TentativeActive() const noexcept;
int TentativeSteps() noexcept;
/// To perform an undo, StartUndo is called to retrieve the number of steps, then UndoStep is
/// called that many times. Similarly for redo.
bool CanUndo() const noexcept;
int StartUndo() noexcept;
const Action &GetUndoStep() const noexcept;
void CompletedUndoStep() noexcept;
bool CanRedo() const noexcept;
int StartRedo() noexcept;
const Action &GetRedoStep() const noexcept;
void CompletedRedoStep() noexcept;
};
}
#endif
|
