/*
	Copyright 2006-2021 The QElectroTech Team
	This file is part of QElectroTech.

	QElectroTech 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 2 of the License, or
	(at your option) any later version.

	QElectroTech 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 QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DIAGRAMEVENTINTERFACE_H
#define DIAGRAMEVENTINTERFACE_H

#include <QObject>

class QGraphicsSceneMouseEvent;
class QGraphicsSceneWheelEvent;
class QKeyEvent;
class Diagram;

/**
	@brief The DiagramEventInterface class
	isRunning() return true if action is running (do something). By default return false.
 *
	##USE DiagramEventInterface##
	This class is the basic interface for manage event on a diagram.
	To create a behavior for event diagram, we need to herite this class.
	This interface work like this :
	You need to create an interface and call diagram::setEventInterface(pointer_of_your_interface).
	When a diagram get an event (mouse or key) if they have an event interface,
	they send the event (with the status accepted to false) to the interface (for exemple mousePressEvent).
	If the interface do something with this event, you need to set to true the accepted status of the event, then diagram do nothing.
	When the interface job is done, we need to emit the signal finish(), the diagram use this signal to delete the interface.
	Be carreful with the destructor, diagram can at any time (even if interface is still running) delete the interface,
	the bool m_abort is here for that at destruction time.
 *
*/
class DiagramEventInterface : public QObject
{
		Q_OBJECT

	public:
		DiagramEventInterface(Diagram *diagram);
		~DiagramEventInterface() override = 0;
		virtual void mouseDoubleClickEvent (QGraphicsSceneMouseEvent *event);
		virtual void mousePressEvent       (QGraphicsSceneMouseEvent *event);
		virtual void mouseMoveEvent        (QGraphicsSceneMouseEvent *event);
		virtual void mouseReleaseEvent     (QGraphicsSceneMouseEvent *event);
		virtual void wheelEvent            (QGraphicsSceneWheelEvent *event);
		virtual void keyPressEvent         (QKeyEvent *event);
		virtual void keyReleaseEvent       (QKeyEvent *event);
		virtual bool isRunning () const;
		virtual void init();

	signals:
		void finish(); //Emited when the interface finish is job.

	protected:
		Diagram *m_diagram;
		bool m_running;
		bool m_abort;
};

#endif // DIAGRAMEVENTINTERFACE_H