SelectionDataModelDecorator.cpp Example File

    /*
     * Copyright (c) 2013 BlackBerry Limited.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    #include "SelectionDataModelDecorator.hpp"

    SelectionDataModelDecorator::SelectionDataModelDecorator(QObject *parent)
        : m_highlight("#36D986") // default greenish hue
    {
    }
    SelectionDataModelDecorator::~SelectionDataModelDecorator() {
    }

    QVariant SelectionDataModelDecorator::data(const QVariantList& indexPath) {
        QVariant data = bb::cascades::datamanager::DataModelDecorator::data(indexPath);
        QVariantMap map = data.value<QVariantMap>();
        if (indexPath.size() == 1 && data.isValid()) {
            // Inject the highlight color into the items data if item is selected.
            map["selected"] =
                    m_selectedSet.contains(map["id"].toInt()) ?
                            m_highlight : QString("#000000"); //defaults to black
        }
        return map;
    }
    void SelectionDataModelDecorator::clearSelections() {
        m_selectedSet.clear();
        // emit signal to refresh all item data after clearing selection set.
        emit itemsChanged(bb::cascades::DataModelChangeType::Update);
    }

    QString SelectionDataModelDecorator::itemType(const QVariantList& indexPath) {
        QVariant data = bb::cascades::datamanager::DataModelDecorator::data(indexPath);
        if (data.isValid()) {
            // Identify these items as ListItemComponents of type "selectable"
            return QString("selectable");
        }
        return QString("");
    }
    void SelectionDataModelDecorator::changeSelection(QVariantList indexPath,
            bool selected) {
        if (selected) {
            QVariant data = bb::cascades::datamanager::DataModelDecorator::data(indexPath);
            if (data.isValid()) {
                QVariantMap map = data.value<QVariantMap>();
                int id = map["id"].toInt();
                // Check whether item already selected, if not add to selection se
                // otherwise remove(unselect) from the set.
                if (!m_selectedSet.contains(id)) {
                    m_selectedSet.insert(id);
                } else {
                    m_selectedSet.remove(id);
                }
                // emit signal to refresh item data
                emit itemUpdated(indexPath);
            }
        }
    }