47 lines
1.8 KiB
C++
47 lines
1.8 KiB
C++
/*
|
|
* InfiniPaint
|
|
* Copyright (C) 2025-2026 Yousef Khadadeh
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
#include <functional>
|
|
#include <deque>
|
|
|
|
// NOTE: This undo manager doesn't completely solve all collisions between clients
|
|
// Example: If both clients erase the same brush stroke at the same time (before either is notified of the erasure), both can
|
|
// undo that step and generate two copies of the same brush stroke. For now, we will deem this to be acceptable since the chances
|
|
// of this happening are low, and even if it does happen, it isn't a massive issue (both clients, and the server, will be aware
|
|
// of the two brush strokes)
|
|
class UndoManager {
|
|
public:
|
|
struct UndoRedoPair {
|
|
std::function<bool()> undo;
|
|
std::function<bool()> redo;
|
|
};
|
|
|
|
void push(const UndoRedoPair& undoRedoPair);
|
|
void undo();
|
|
void redo();
|
|
void clear();
|
|
bool can_undo();
|
|
bool can_redo();
|
|
private:
|
|
void push_undo(const UndoRedoPair& undoRedoPair);
|
|
void push_redo(const UndoRedoPair& undoRedoPair);
|
|
size_t queueLimit = 250;
|
|
std::deque<UndoRedoPair> undoQueue;
|
|
std::deque<UndoRedoPair> redoQueue;
|
|
};
|