ListView grid change to list dynamically

Dear developers

I have a listview that is represented by a grid. But I want a menuaction to change the schedule to the list and vice versa. But it seems more difficult, so I thought. My griditems are different then my listitems. For those who must change too.

That's what I have so far but I'm stuck to be honest.

import bb.cascades 1.0

Container {
    property bool isGrid: true

    ListView {
        id: listView
        dataModel: channelListVM.otherDataModel
        horizontalAlignment: HorizontalAlignment.Fill
        layoutProperties: StackLayoutProperties {
            spaceQuota: 1.0
        }
        layout: isGrid ? gridLayout : stackLayout
        listItemComponents: [
            ListItemComponent {
                type: "gridItem"
                GridItem {
                    contextActions: ActionSet {
                        title: ListItemData.name
                        actions: [
                            ActionItem {
                                title: qsTr("Favorite")
                                imageSource: "asset:///img/bb_action_favorites.png"
                                onTriggered: {
                                    ListItemData.favorite()
                                }
                            }
                        ]
                    }
                }
            },
            ListItemComponent {
                type: "listItem"
                MyListItem {
                    contextActions: ActionSet {
                        title: ListItemData.name
                        actions: [
                            ActionItem {
                                title: qsTr("Favorite")
                                imageSource: "asset:///img/bb_action_favorites.png"
                                onTriggered: {
                                    ListItemData.favorite()
                                }
                            }
                        ]
                    }
                }
            }
        ]

        function itemType(data, indexPath) {
            if(isGrid) {
                return "gridItem";
            }

            return "listItem";
        }

        attachedObjects: [
            StackListLayout {
                id: stackLayout
            },
            GridListLayout {
                id: gridLayout
                columnCount: 3
                horizontalCellSpacing: 10.0
                verticalCellSpacing: 10.0
                cellAspectRatio: 1
            }
        ]
    }
}

And when I change the isGrid true or false, it amends the provision but it seems that the UI is not updated. How can I fix without working with 2 ListViews and hide/show them about the property?

Thanks in advance

Since you're using the itemType function you do not require a change in your database. However, given that you match the layout of your choice of item type, you will need to notify the ListView that its cache is no longer valid. If ListView will not selection of the type of return until you load a new element in its cache.

To do this, you just have your DataModel emit a signal after you change your property to isGrid. This is done via DataModel::itemsChanged. Since you want your entire list to rebuild, you want to give him the DataModelChangeType::Init.

Code wise, you need to add this call:

channelListVM.otherDataModel.itemsChanged(DataModelChangeType.Init)

Tags: BlackBerry Developers

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ListView grid change to list dynamically

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