/*

* This file is part of the GreasePad distribution (https://github.com/FraunhoferIOSB/GreasePad).

* Copyright (c) 2022-2023 Jochen Meidow, Fraunhofer IOSB

*

* 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/>.

*/

#ifndef COMMANDS_H

#define COMMANDS_H

#include <memory>

#include <QGraphicsScene>

#include <QUndoCommand>

class State;

namespace GUI {

class MainScene;

}

//! Namespace for commands (und/redo)

namespace Cmd {

//! Base class for undo/redo commands

class Undo : public QUndoCommand

{

public:

Undo( const Undo &) = delete; //!< Copy constructor

Undo (Undo &&) = delete; //!< Move constructor

Undo & operator= (const Undo & other) = delete; //!< Copy assignment operator

Undo & operator= (Undo && other) = delete; //!< Move assignment operator

protected:

Undo( QUndoCommand *parent=nullptr); //!< Standard constructor

~Undo() override = default;

State *current_state_{}; //!< Pointer to current state

std::unique_ptr<State> next_state_; //!< Pointer to next state (redo)

std::unique_ptr<State> prev_state_; //!< Pointer to previous state (undo)

public:

//! Set pointer to scene

static void setScene ( GUI::MainScene * sc) { s_scene = sc; }

//! Get pointer to scene

static GUI::MainScene * scene() { return s_scene; }

private:

static GUI::MainScene *s_scene;

};

//! Command 'add a stroke'

class AddStroke : public Undo

{

public:

//! Value constructor

AddStroke( State *curr,

std::unique_ptr<State> & p,

std::unique_ptr<State> & n,

QUndoCommand *parent=nullptr);

AddStroke( const AddStroke &) = delete;

AddStroke( AddStroke &&) = delete;

AddStroke operator= (const AddStroke &) = delete;

AddStroke operator= ( AddStroke &&) = delete;

~AddStroke() override = default;

private:

void redo() override;

void undo() override;

};

//! Command 'delete selection'

class DeleteSelection : public Undo

{

public:

//! Value constructor

DeleteSelection( State *st,

std::unique_ptr<State> &p,

std::unique_ptr<State> &n,

QUndoCommand *parent=nullptr);

private:

void redo() override;

void undo() override;

};

//! Command 'clear all'

class TabulaRasa : public Undo

{

public:

//! Value constructor

TabulaRasa( State *st,

QUndoCommand *parent=nullptr);

private:

void redo() override;

void undo() override;

};

//! Command 'replace view with file content'

class ReplaceStateWithFileContent : public Undo

{

public:

//! Value constructor (filename)

ReplaceStateWithFileContent( const QString &fileName,

State *curr,

std::unique_ptr<State> &p,

std::unique_ptr<State> &n,

QUndoCommand *parent=nullptr);

private:

void redo() override;

void undo() override;

};

} // namespace Cmd

#endif // COMMANDS_H