/***************************************************************************
 *   Copyright (C) 2008 by S. MANKOWSKI / G. DE BURE support@mankowski.fr  *
 *                                                                         *
 *   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 2 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 <http://www.gnu.org/licenses/>  *
 ***************************************************************************/
#ifndef SKGWIDGET_H
#define SKGWIDGET_H
/** @file
 * This file is a class managing widget.
 *
 * @author Stephane MANKOWSKI / Guillaume DE BURE
 */
#include <qwidget.h>



#include "skgbasegui_export.h"
#include "skgobjectbase.h"

class SKGDocument;

/**
 * This file is a tab widget used by plugins
 */
class SKGBASEGUI_EXPORT SKGWidget : public QWidget
{
    Q_OBJECT

public:
    /**
     * Default Constructor
     * @param iParent the parent widget
     * @param iDocument the document
     */
    explicit SKGWidget(QWidget* iParent, SKGDocument* iDocument);

    /**
     * Default Destructor
     */
    ~SKGWidget() override;

    /**
     * Get main document
     * @return pointer on main document
     */
    virtual SKGDocument* getDocument() const;

    /**
     * Get the current state
     * MUST BE OVERWRITTEN
     * @return a string containing all information needed to set the same state.
     * Could be an XML stream
     */
    virtual QString getState();

    /**
     * Set the current state
     * MUST BE OVERWRITTEN
     * @param iState must be interpreted to set the state of the widget
     */
    virtual void setState(const QString& iState);

    /**
     * Get attribute name to save the default state
     * MUST BE OVERWRITTEN
     * @return attribute name to save the default state.
     */
    virtual QString getDefaultStateAttribute();

    /**
     * Get the current selection
     * MUST BE OVERWRITTEN
     * @return selected objects
     */
    virtual SKGObjectBase::SKGListSKGObjectBase getSelectedObjects();

    /**
     * Get the first selected object
     * @return first selected object
     */
    virtual SKGObjectBase getFirstSelectedObject();

    /**
     * Get the number of seleted object
     * CAN BE OVERWRITTEN FOR OPTIMIZATION
     * @return number of selected objects
     */
    virtual int getNbSelectedObjects();

    /**
     * To know if the widget having the selection has the focus
     * Default implementation is based on mainWidget
     * Don't forget to do mainWidget()->installEventFilter(this);
     * @return true of false
     */
    virtual bool hasSelectionWithFocus();

    /**
     * Get the main widget
     * @return a widget
     */
    virtual QWidget* mainWidget();

Q_SIGNALS:
    /**
     * This signal must be launched when the selection is modified
     */
    void selectionChanged();

    /**
     * This signal must be launched when the widget having the selection has win or lost the focus
     */
    void selectionFocusChanged();
protected:
    /**
     * Event filtering
     * @param iObject object
     * @param iEvent event
     * @return In your reimplementation of this function, if you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false.
     */
    bool eventFilter(QObject* iObject, QEvent* iEvent) override;

private:
    Q_DISABLE_COPY(SKGWidget)

    SKGDocument*  m_document;
};

#endif  // SKGWIDGET_H
