qt-everywhere-src-5.14.1/qtlocation/src/location/declarativeplaces/qdeclarativeplaceimagemodel.cpp

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#include "qdeclarativeplaceimagemodel_p.h"
#include "qdeclarativesupplier_p.h"

#include <QtCore/QUrl>
#include <QtLocation/QPlaceImage>

QT_BEGIN_NAMESPACE

/*!
    \qmltype ImageModel
    \instantiates QDeclarativePlaceImageModel
    \inqmlmodule QtLocation
    \ingroup qml-QtLocation5-places
    \ingroup qml-QtLocation5-places-models
    \since QtLocation 5.5

    \brief The ImageModel type provides a model of place images.

    The ImageModel is a read-only model used to fetch images related to a \l Place.
    Binding a \l Place via \l ImageModel::place initiates an initial fetch of images.
    The model performs fetches incrementally and is intended to be used in conjunction
    with a View such as a \l ListView.  When the View reaches the last of the images
    currently in the model, a fetch is performed to retrieve more if they are available.
    The View is automatically updated as the images are received.  The number of images
    which are fetched at a time is specified by the \l batchSize property.  The total number
    of images available can be accessed via the \l totalCount property.

    The model returns data for the following roles:

    \table
        \header
            \li Role
            \li Type
            \li Description
        \row
            \li url
            \li url
            \li The URL of the image.
        \row
            \li imageId
            \li string
            \li The identifier of the image.
        \row
            \li mimeType
            \li string
            \li The MIME type of the image.
        \row
            \li supplier
            \li \l Supplier
            \li The supplier of the image.
        \row
            \li user
            \li \l {QtLocation::User}{User}
            \li The user who contributed the image.
        \row
            \li attribution
            \li string
            \li Attribution text which must be displayed when displaying the image.
    \endtable


    \section1 Example

    The following example shows how to display images for a place:

    \snippet declarative/places.qml QtQuick import
    \snippet declarative/maps.qml QtLocation import
    \codeline
    \snippet declarative/places.qml ImageModel
*/

/*!
    \qmlproperty Place ImageModel::place

    This property holds the Place that the images are for.
*/

/*!
    \qmlproperty int ImageModel::batchSize

    This property holds the batch size to use when fetching more image items.
*/

/*!
    \qmlproperty int ImageModel::totalCount

    This property holds the total number of image items for the place.
*/

QDeclarativePlaceImageModel::QDeclarativePlaceImageModel(QObject *parent)
:   QDeclarativePlaceContentModel(QPlaceContent::ImageType, parent)
{
}

QDeclarativePlaceImageModel::~QDeclarativePlaceImageModel()
{
    qDeleteAll(m_suppliers);
}

/*!
    \internal
*/
QVariant QDeclarativePlaceImageModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

    if (index.row() >= rowCount(index.parent()) || index.row() < 0)
        return QVariant();

    const QPlaceImage &image = m_content.value(index.row());

    switch (role) {
    case UrlRole:
        return image.url();
    case ImageIdRole:
        return image.imageId();
    case MimeTypeRole:
        return image.mimeType();
    }

    return QDeclarativePlaceContentModel::data(index, role);
}

QHash<int, QByteArray> QDeclarativePlaceImageModel::roleNames() const
{
    QHash<int, QByteArray> roles = QDeclarativePlaceContentModel::roleNames();
    roles.insert(UrlRole, "url");
    roles.insert(ImageIdRole, "imageId");
    roles.insert(MimeTypeRole, "mimeType");
    return roles;
}

QT_END_NAMESPACE