ExpandableDataModelDecorator.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 "ExpandableDataModelDecorator.hpp"
    #include <bb/cascades/DataModelChangeType>

    ExpandableDataModelDecorator::ExpandableDataModelDecorator(QObject* parent)
        : bb::cascades::datamanager::DataModelDecorator(parent)
        , m_expandedIndex(-1)
    {
    }

    ExpandableDataModelDecorator::~ExpandableDataModelDecorator() {
    }

    QVariant ExpandableDataModelDecorator::data(const QVariantList& indexPath) {
        QVariant data = bb::cascades::datamanager::DataModelDecorator::data(
                indexPath);
        if (data.isValid()) {
            QVariantMap map = data.value<QVariantMap>();
            if (indexPath.size() == 1) {
                map["expanded"] = (indexPath[0] == m_expandedIndex);
            }
            return map;
        }
        return data;
    }
    bool ExpandableDataModelDecorator::isExpandable(
            const QVariantList& indexPath) const {
        return indexPath.size() == 1 && indexPath[0].toInt() != m_expandedIndex;
    }

    int ExpandableDataModelDecorator::childCount(const QVariantList& indexPath) {
        if (isExpandable(indexPath)) {
            return 0;
        }
        return bb::cascades::datamanager::DataModelDecorator::childCount(indexPath);
    }

    bool ExpandableDataModelDecorator::hasChildren(const QVariantList& indexPath) {
        if (isExpandable(indexPath)) {
            return false;
        }
        return bb::cascades::datamanager::DataModelDecorator::hasChildren(indexPath);
    }
    void ExpandableDataModelDecorator::expandHeader(const QVariantList& indexPath,
            bool expand) {
        if (indexPath.size() == 1 && expand) {
            int index = indexPath[0].toInt();
            if (index == m_expandedIndex) {
                m_expandedIndex = -1;
                emit itemsChanged(bb::cascades::DataModelChangeType::AddRemove);
            } else {
                m_expandedIndex = index;
                emit itemsChanged(bb::cascades::DataModelChangeType::AddRemove);
            }
        }
    }