qtmultimedia/src/imports/multimedia/qdeclarativecamerafocus.cpp

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#include "qdeclarativecamera_p.h"
#include "qdeclarativecamerafocus_p.h"

QT_BEGIN_NAMESPACE

/*!
    \qmlclass CameraFocus QDeclarativeCameraFocus
    \inqmlmodule QtMultimedia 5
    \brief The CameraFocus element provides interface for focus related camera settings.
    \ingroup multimedia_qml
    \ingroup camera_qml

    This element is part of the \b{QtMultimedia 5.0} module.

    The CameraFocus element allows control over manual and automatic
    focus settings, including information about any parts of the
    camera frame that are selected for autofocusing.

    It is not constructed separately but is provided by the
    \l Camera element's \c focus property.

    \qml
    import QtQuick 2.0
    import QtMultimedia 5.0

    Item {
        width: 640
        height: 360

        Camera {
            id: camera

            focus {
                focusMode: Camera.FocusMacro
                focusPointMode: Camera.FocusPointCustom
                customFocusPoint: Qt.point(0.2, 0.2) //focus to top-left corner
            }
        }

        VideoOutput {
            source: camera
            anchors.fill: parent
        }
    }

    \endqml
*/

/*!
    \class QDeclarativeCameraFocus
    \internal
    \brief The CameraFocus element provides interface for focus related camera settings.
*/

/*!
    Construct a declarative camera focus object using \a parent object.
 */

QDeclarativeCameraFocus::QDeclarativeCameraFocus(QCamera *camera, QObject *parent) :
    QObject(parent)
{
    m_focus = camera->focus();
    m_focusZones = new FocusZonesModel(this);

    updateFocusZones();

    connect(m_focus, SIGNAL(focusZonesChanged()), SLOT(updateFocusZones()));
}

QDeclarativeCameraFocus::~QDeclarativeCameraFocus()
{
}


/*!
    \qmlproperty QtMultimedia5::Camera::FocusMode CameraFocus::focusMode
    \property QDeclarativeCameraFocus::focusMode

    The current camera focus mode.

    It's possible to combine multiple Camera::FocusMode values,
    for example Camera.FocusMacro + Camera.FocusContinuous.

    In automatic focusing modes, the \l focusPointMode property
    and \l focusZones property provide information and control
    over how automatic focusing is performed.
*/
QDeclarativeCamera::FocusMode QDeclarativeCameraFocus::focusMode() const
{
    return QDeclarativeCamera::FocusMode(int(m_focus->focusMode()));
}

/*!
    \qmlmethod bool QtMultimedia5::CameraFocus::isFocusModeSupported(mode) const
    \fn QDeclarativeCameraFocus::isFocusModeSupported(QDeclarativeCamera::FocusMode mode) const

    Returns true if the supplied \a mode is a supported focus mode, and
    false otherwise.
*/
bool QDeclarativeCameraFocus::isFocusModeSupported(QDeclarativeCamera::FocusMode mode) const
{
    return m_focus->isFocusModeSupported(QCameraFocus::FocusModes(int(mode)));
}

void QDeclarativeCameraFocus::setFocusMode(QDeclarativeCamera::FocusMode mode)
{
    m_focus->setFocusMode(QCameraFocus::FocusModes(int(mode)));
}

/*!
    \qmlproperty QtMultimedia5::CameraFocus::FocusPointMode CameraFocus::focusPointMode
    \property QDeclarativeCameraFocus::focusPointMode

    The current camera focus point mode.  This is used in automatic
    focusing modes to determine what to focus on.

    If the current focus point mode is \c Camera.FocusPointCustom, the
    \l customFocusPoint property allows you to specify which part of
    the frame to focus on.
*/
QDeclarativeCamera::FocusPointMode QDeclarativeCameraFocus::focusPointMode() const
{
    return QDeclarativeCamera::FocusPointMode(m_focus->focusPointMode());
}

void QDeclarativeCameraFocus::setFocusPointMode(QDeclarativeCamera::FocusPointMode mode)
{
    if (mode != focusPointMode()) {
        m_focus->setFocusPointMode(QCameraFocus::FocusPointMode(mode));
        emit focusPointModeChanged(focusPointMode());
    }
}

/*!
    \qmlmethod bool QtMultimedia5::CameraFocus::isFocusPointModeSupported(mode) const
    \fn QDeclarativeCameraFocus::isFocusPointModeSupported(QDeclarativeCamera::FocusPointMode mode) const

    Returns true if the supplied \a mode is a supported focus point mode, and
    false otherwise.
*/
bool QDeclarativeCameraFocus::isFocusPointModeSupported(QDeclarativeCamera::FocusPointMode mode) const
{
    return m_focus->isFocusPointModeSupported(QCameraFocus::FocusPointMode(mode));
}

/*!
    \qmlproperty QPointF QtMultimedia5::CameraFocus::customFocusPoint
  \property QDeclarativeCameraFocus::customFocusPoint

  Position of custom focus point, in relative frame coordinates:
  QPointF(0,0) points to the left top frame point, QPointF(0.5,0.5)
  points to the frame center.

  Custom focus point is used only in FocusPointCustom focus mode.
*/

QPointF QDeclarativeCameraFocus::customFocusPoint() const
{
    return m_focus->customFocusPoint();
}

void QDeclarativeCameraFocus::setCustomFocusPoint(const QPointF &point)
{
    if (point != customFocusPoint()) {
        m_focus->setCustomFocusPoint(point);
        emit customFocusPointChanged(customFocusPoint());
    }
}

/*!
    \qmlproperty QPointF QtMultimedia5::CameraFocus::focusZones
  \property QDeclarativeCameraFocus::focusZones

  List of current camera focus zones,
  each including \c area specified in the same coordinates as \l customFocusPoint
  and zone \c status as one of the following values:

    \table
    \header \li Value \li Description
    \row \li Camera.FocusAreaUnused  \li This focus point area is currently unused in autofocusing.
    \row \li Camera.FocusAreaSelected    \li This focus point area is used in autofocusing, but is not in focus.
    \row \li Camera.FocusAreaFocused  \li This focus point is used in autofocusing, and is in focus.
    \endtable


  \qml

  VideoOutput {
      id: viewfinder
      source: camera

      //display focus areas on camera viewfinder:
      Repeater {
            model: camera.focus.focusZones

            Rectangle {
                border {
                    width: 2
                    color: status == Camera.FocusAreaFocused ? "green" : "white"
                }
                color: "transparent"

                // Map from the relative, normalized frame coordinates
                property variant mappedRect: viewfinder.mapNormalizedRectToItem(area);

                x: mappedRect.x
                y: mappedRect.y
                width: mappedRect.width
                height: mappedRect.height
            }
      }
  }
  \endqml
*/

QAbstractListModel *QDeclarativeCameraFocus::focusZones() const
{
    return m_focusZones;
}

/*! \internal */
void QDeclarativeCameraFocus::updateFocusZones()
{
    m_focusZones->setFocusZones(m_focus->focusZones());
}


FocusZonesModel::FocusZonesModel(QObject *parent)
    :QAbstractListModel(parent)
{
    QHash<int, QByteArray> roles;
    roles[StatusRole] = "status";
    roles[AreaRole] = "area";
    setRoleNames(roles);
}

int FocusZonesModel::rowCount(const QModelIndex &parent) const
{
    if (parent == QModelIndex())
        return m_focusZones.count();

    return 0;
}

QVariant FocusZonesModel::data(const QModelIndex &index, int role) const
{
    if (index.row() < 0 || index.row() > m_focusZones.count())
        return QVariant();

    QCameraFocusZone zone = m_focusZones.value(index.row());

    if (role == StatusRole)
        return zone.status();

    if (role == AreaRole)
        return zone.area();

    return QVariant();
}

void FocusZonesModel::setFocusZones(const QCameraFocusZoneList &zones)
{
    beginResetModel();
    m_focusZones = zones;
    endResetModel();
}

QT_END_NAMESPACE

#include "moc_qdeclarativecamerafocus_p.cpp"