ExpandableDecorator.qml 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.
     */

    import bb.cascades 1.0
    import bb.cascades.datamanager 1.2
    import bb.cascades.decorators 1.2

    // ActionItem that deals with ExpandableDataModel decorator,
    // which allows the list to expand or hide, based on a custom
    // field value that is injected into the data set by the decorator.
    ActionItem {
        ActionBar.placement: ActionBarPlacement.InOverflow
        onTriggered: {
            expandableModel.load()
            listView.dataModel = expandableDecorator
            listView.selectionChanged.connect(expandableDecorator.expandHeader)
        }

        attachedObjects: [
            // Decorator for allowing the expansion/contraction of header items.
            ExpandableDataModelDecorator {
                id: expandableDecorator
                model: AsyncHeaderDataModel {
                    id: expandableModel
                    query: SqlHeaderDataQuery {
                        source: _sqlImagesDir + "/../discogs_small.db"
                        query: "select title as name, primary_image, master_genre.genre from master_genre, master where master_genre.master_id=master.id order by genre"
                        countQuery: "select count(*) from master_genre, master where master_genre.master_id=master.id"
                        headerQuery: "select master_genre.genre as header, count(*) from master_genre, master where master_genre.master_id=master.id group by header"
                        onDataChanged: console.log("data changed: revision=" + revision)
                        onError: console.log("SQL query error: " + code + ", " + message)
                    }
                }
            }
        ]
    }