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0001 /* 0002 SPDX-FileCopyrightText: 2017 Nicolas Carion 0003 SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL 0004 */ 0005 0006 #pragma once 0007 0008 #include <functional> 0009 0010 using Fun = std::function<bool(void)>; 0011 0012 /** @brief this macro executes an operation after a given lambda 0013 */ 0014 #define PUSH_LAMBDA(operation, lambda) \ 0015 lambda = [lambda, operation]() { \ 0016 bool v = lambda(); \ 0017 return v && operation(); \ 0018 }; 0019 0020 /** @brief this macro executes an operation before a given lambda 0021 */ 0022 #define PUSH_FRONT_LAMBDA(operation, lambda) \ 0023 lambda = [lambda, operation]() { \ 0024 bool v = operation(); \ 0025 return v && lambda(); \ 0026 }; 0027 0028 #include <QUndoCommand> 0029 0030 /** @brief this is a generic class that takes fonctors as undo and redo actions. It just executes them when required by Qt 0031 Note that QUndoStack actually executes redo() when we push the undoCommand to the stack 0032 This is bad for us because we execute the command as we construct the undo Function. So to prevent it to be executed twice, there is a small hack in this 0033 command that prevent redoing if it has not been undone before. 0034 */ 0035 class FunctionalUndoCommand : public QUndoCommand 0036 { 0037 public: 0038 FunctionalUndoCommand(Fun undo, Fun redo, const QString &text, QUndoCommand *parent = nullptr); 0039 void undo() override; 0040 void redo() override; 0041 0042 private: 0043 Fun m_undo, m_redo; 0044 bool m_undone; 0045 };