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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtDataVisualization module.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
**
****************************************************************************/

#include "datavisualizationglobal_p.h"
#include "q3dinputhandler_p.h"

QT_BEGIN_NAMESPACE_DATAVISUALIZATION

const int minZoomLevel         = 10;
const int halfSizeZoomLevel    = 50;
const int oneToOneZoomLevel    = 100;
const int maxZoomLevel         = 500;

const int nearZoomRangeDivider = 12;
const int midZoomRangeDivider  = 60;
const int farZoomRangeDivider  = 120;

const float rotationSpeed      = 100.0f;

/*!
 * \class Q3DInputHandler
 * \inmodule QtDataVisualization
 * \brief Basic wheel mouse based input handler.
 * \since QtDataVisualization 1.0
 *
 * Q3DInputHandler is the basic input handler for wheel mouse type of input devices.
 *
 * Default input handler has the following functionalty:
 * \table
 *      \header
 *          \li Mouse action
 *          \li Action
 *      \row
 *          \li Drag with right button pressed
 *          \li Rotate graph within limits set for Q3DCamera.
 *      \row
 *          \li Left click
 *          \li Select item under cursor or remove selection if none.
 *              May open the secondary view depending on the
 *              \l {QAbstract3DGraph::selectionMode}{selection mode}.
 *      \row
 *          \li Mouse wheel
 *          \li Zoom in/out within default range (10...500%).
 *      \row
 *          \li Left click on the primary view when the secondary view is visible
 *          \li Closes the secondary view.
 *          \note Secondary view is available only for Q3DBars and Q3DSurface graphs.
 * \endtable
 *
 * Rotation, zoom, and selection can each be individually disabled using
 * corresponding properties of this class.
 */

/*!
 * \qmltype InputHandler3D
 * \inqmlmodule QtDataVisualization
 * \since QtDataVisualization 1.2
 * \ingroup datavisualization_qml
 * \instantiates Q3DInputHandler
 * \brief Basic wheel mouse based input handler.
 *
 * InputHandler3D is the basic input handler for wheel mouse type of input devices.
 *
 * See Q3DInputHandler documentation for more details.
 */

/*!
 * \qmlproperty bool InputHandler3D::rotationEnabled
 * \since QtDataVisualization 1.2
 *
 * This property specifies if this input handler allows graph rotation.
 */

/*!
 * \qmlproperty bool InputHandler3D::zoomEnabled
 * \since QtDataVisualization 1.2
 *
 * This property specifies if this input handler allows graph zooming.
 */

/*!
 * \qmlproperty bool InputHandler3D::selectionEnabled
 * \since QtDataVisualization 1.2
 *
 * This property specifies if this input handler allows selection from the graph.
 */

/*!
 * Constructs the basic mouse input handler. An optional \a parent parameter can be given
 * and is then passed to QObject constructor.
 */
Q3DInputHandler::Q3DInputHandler(QObject *parent) :
    QAbstract3DInputHandler(parent),
    d_ptr(new Q3DInputHandlerPrivate(this))
{
}

/*!
 *  Destroys the input handler.
 */
Q3DInputHandler::~Q3DInputHandler()
{
}

// Input event listeners
/*!
 * Override this to change handling of mouse press events.
 * Mouse press event is given in the \a event and the mouse position in \a mousePos.
 */
void Q3DInputHandler::mousePressEvent(QMouseEvent *event, const QPoint &mousePos)
{
#if defined(Q_OS_IOS)
    Q_UNUSED(event);
    Q_UNUSED(mousePos);
#else
    if (Qt::LeftButton == event->button()) {
        if (isSelectionEnabled()) {
            if (scene()->isSlicingActive()) {
                if (scene()->isPointInPrimarySubView(mousePos))
                    setInputView(InputViewOnPrimary);
                else if (scene()->isPointInSecondarySubView(mousePos))
                    setInputView(InputViewOnSecondary);
                else
                    setInputView(InputViewNone);
            } else {
                // update mouse positions to prevent jumping when releasing or repressing a button
                setInputPosition(mousePos);
                scene()->setSelectionQueryPosition(mousePos);
                setInputView(InputViewOnPrimary);
                d_ptr->m_inputState = QAbstract3DInputHandlerPrivate::InputStateSelecting;
            }
        }
    } else if (Qt::MiddleButton == event->button()) {
        if (isRotationEnabled()) {
            // reset rotations
            setInputPosition(QPoint(0, 0));
        }
    } else if (Qt::RightButton == event->button()) {
        if (isRotationEnabled()) {
            // disable rotating when in slice view
            if (!scene()->isSlicingActive())
                d_ptr->m_inputState = QAbstract3DInputHandlerPrivate::InputStateRotating;
            // update mouse positions to prevent jumping when releasing or repressing a button
            setInputPosition(mousePos);
        }
    }
#endif
}

/*!
 * Override this to change handling of mouse release events.
 * Mouse release event is given in the \a event and the mouse position in \a mousePos.
 */
void Q3DInputHandler::mouseReleaseEvent(QMouseEvent *event, const QPoint &mousePos)
{
    Q_UNUSED(event);
#if defined(Q_OS_IOS)
    Q_UNUSED(mousePos);
#else
    if (QAbstract3DInputHandlerPrivate::InputStateRotating == d_ptr->m_inputState) {
        // update mouse positions to prevent jumping when releasing or repressing a button
        setInputPosition(mousePos);
    }
    d_ptr->m_inputState = QAbstract3DInputHandlerPrivate::InputStateNone;
    setInputView(InputViewNone);
#endif
}

/*!
 * Override this to change handling of mouse move events.
 * Mouse move event is given in the \a event and the mouse position in \a mousePos.
 */
void Q3DInputHandler::mouseMoveEvent(QMouseEvent *event, const QPoint &mousePos)
{
    Q_UNUSED(event);
#if defined(Q_OS_IOS)
    Q_UNUSED(mousePos);
#else
    if (QAbstract3DInputHandlerPrivate::InputStateRotating == d_ptr->m_inputState
            && isRotationEnabled()) {
        // Calculate mouse movement since last frame
        float xRotation = scene()->activeCamera()->xRotation();
        float yRotation = scene()->activeCamera()->yRotation();
        float mouseMoveX = float(inputPosition().x() - mousePos.x())
                / (scene()->viewport().width() / rotationSpeed);
        float mouseMoveY = float(inputPosition().y() - mousePos.y())
                / (scene()->viewport().height() / rotationSpeed);
        // Apply to rotations
        xRotation -= mouseMoveX;
        yRotation -= mouseMoveY;
        scene()->activeCamera()->setXRotation(xRotation);
        scene()->activeCamera()->setYRotation(yRotation);

        setPreviousInputPos(inputPosition());
        setInputPosition(mousePos);
    }
#endif
}

/*!
 * Override this to change handling of wheel events.
 * The wheel event is given in the \a event.
 */
void Q3DInputHandler::wheelEvent(QWheelEvent *event)
{
    if (isZoomEnabled()) {
        // disable zooming if in slice view
        if (scene()->isSlicingActive())
            return;

        // Adjust zoom level based on what zoom range we're in.
        int zoomLevel = scene()->activeCamera()->zoomLevel();
        if (zoomLevel > oneToOneZoomLevel)
            zoomLevel += event->angleDelta().y() / nearZoomRangeDivider;
        else if (zoomLevel > halfSizeZoomLevel)
            zoomLevel += event->angleDelta().y() / midZoomRangeDivider;
        else
            zoomLevel += event->angleDelta().y() / farZoomRangeDivider;
        if (zoomLevel > maxZoomLevel)
            zoomLevel = maxZoomLevel;
        else if (zoomLevel < minZoomLevel)
            zoomLevel = minZoomLevel;

        scene()->activeCamera()->setZoomLevel(zoomLevel);
    }
}

/*!
 * \property Q3DInputHandler::rotationEnabled
 * \since QtDataVisualization 1.2
 *
 * This property specifies if this input handler allows graph rotation.
 */
void Q3DInputHandler::setRotationEnabled(bool enable)
{
    if (d_ptr->m_rotationEnabled != enable) {
        d_ptr->m_rotationEnabled = enable;
        emit rotationEnabledChanged(enable);
    }
}

bool Q3DInputHandler::isRotationEnabled() const
{
    return d_ptr->m_rotationEnabled;
}

/*!
 * \property Q3DInputHandler::zoomEnabled
 * \since QtDataVisualization 1.2
 *
 * This property specifies if this input handler allows graph zooming.
 */
void Q3DInputHandler::setZoomEnabled(bool enable)
{
    if (d_ptr->m_zoomEnabled != enable) {
        d_ptr->m_zoomEnabled = enable;
        emit zoomEnabledChanged(enable);
    }
}

bool Q3DInputHandler::isZoomEnabled() const
{
    return d_ptr->m_zoomEnabled;
}

/*!
 * \property Q3DInputHandler::selectionEnabled
 * \since QtDataVisualization 1.2
 *
 * This property specifies if this input handler allows selection from the graph.
 */
void Q3DInputHandler::setSelectionEnabled(bool enable)
{
    if (d_ptr->m_selectionEnabled != enable) {
        d_ptr->m_selectionEnabled = enable;
        emit selectionEnabledChanged(enable);
    }
}

bool Q3DInputHandler::isSelectionEnabled() const
{
    return d_ptr->m_selectionEnabled;
}

Q3DInputHandlerPrivate::Q3DInputHandlerPrivate(Q3DInputHandler *q)
    : q_ptr(q),
      m_inputState(QAbstract3DInputHandlerPrivate::InputStateNone),
      m_rotationEnabled(true),
      m_zoomEnabled(true),
      m_selectionEnabled(true)
{
}

Q3DInputHandlerPrivate::~Q3DInputHandlerPrivate()
{
}

QT_END_NAMESPACE_DATAVISUALIZATION