/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef IMAGEWIDGET_H
#define IMAGEWIDGET_H

#include <QWidget>
#include <QImage>
#include <QtWidgets>

QT_BEGIN_NAMESPACE
class QGestureEvent;
class QPanGesture;
class QPinchGesture;
class QSwipeGesture;
QT_END_NAMESPACE

Q_DECLARE_LOGGING_CATEGORY(lcExample)

//! [class definition begin]
class ImageWidget : public QWidget
{
    Q_OBJECT

public:
    ImageWidget(QWidget *parent = 0);
    void openDirectory(const QString &path);
    void grabGestures(const QList<Qt::GestureType> &gestures);

protected:
    bool event(QEvent *event) override;
    void paintEvent(QPaintEvent *event) override;
    void resizeEvent(QResizeEvent *event) override;
    void mouseDoubleClickEvent(QMouseEvent *event) override;

private:
    bool gestureEvent(QGestureEvent *event);
    void panTriggered(QPanGesture*);
    void pinchTriggered(QPinchGesture*);
    void swipeTriggered(QSwipeGesture*);
//! [class definition begin]

    QImage loadImage(const QString &fileName);
    void loadImage();
    void goNextImage();
    void goPrevImage();
    void goToImage(int index);

    QString path;
    QStringList files;
    int position;

    QImage prevImage, nextImage;
    QImage currentImage;

    qreal horizontalOffset;
    qreal verticalOffset;
    qreal rotationAngle;
    qreal scaleFactor;
    qreal currentStepScaleFactor;
//! [class definition end]
};
//! [class definition end]

#endif
