ArrayDataModel and asynchronous data

Hello

I've done listview with a custom ListItemComponent and I need to show 20 items and when the descent to the bottom of the screen 20 is another element, like at the end of the data.

And I using the data source.

I saw these pages, and I knew a little information.

https://developer.BlackBerry.com/native/reference/Cascades/bb__cascades__arraydatamodel.html

https://developer.BlackBerry.com/native/documentation/Cascades/UI/lists/asynch_data.html

A few attempts worked, but did not work with me.

Now, I know when you go down down, by which I can add data:

ListScrollStateHandler {
            id: scrollStateHandler

             onScrollingChanged: {             if (atEnd) {                  // I can add more data                           }
                                           }
                               }

My question:

How to do when running the application view 20 items only, then when using 'atEnd' indicate the other elements, at the end of the data.

Thank you!

import bb.cascades 1.2

Page {
    Container {
        ListView {
            id: listView

            dataModel: GroupDataModel {
                id: listDataModel

                sortedAscending: true
                sortingKeys: ["label"]
                grouping: ItemGrouping.None
            }

            onCreationCompleted: {
                for (var i = 0; i < 100; i++) {
                    storageDataModel.insert({"label": "test " + i})
                }
                move();
            }

            attachedObjects:
            [
                ListScrollStateHandler {
                    id: scrollStateHandler

                    onScrollingChanged: {
                        if (atEnd) {
                            listView.move();
                        }
                    }
                },
                GroupDataModel {
                    id: storageDataModel

                    sortedAscending: true
                    sortingKeys: ["label"]
                    grouping: ItemGrouping.None
                }
            ]

            function move () {

                if (listDataModel.size () >= storageDataModel.size())
                    return;

                var objectList = []
                var n = listDataModel.size()

                for (var i = n; i < Math.min(storageDataModel.size(), n + 20); i ++) {
                    var myIndexPath = []
                    myIndexPath[0] = i
                    var item = storageDataModel.data(myIndexPath);
                    objectList.push(item)
                }
                listDataModel.insertList(objectList);
            }
        }
    }
}

Tags: BlackBerry Developers

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