ListView loads wrong model behavior data / not deterministic?

I have a fife ListViews that you can scroll between. Its type is assigned to each of them, and it shows its own set of data.

typeA: 1-10, typeB: typeC from 0.1 to 1: 1 to 15, typed: 1-10, type: 0.5 to 5

Its just qml and looks like this (main.qml):

import bb.cascades 1.0

Page {
    Container {

        layout: DockLayout { }

        ListView {
            id: unit_list

            maxHeight: 300
            maxWidth: 300

            layout: StackListLayout {
                orientation: LayoutOrientation.LeftToRight
            }

            dataModel: GroupDataModel {
                grouping: ItemGrouping.None
                sortingKeys: [ "position" ]
            }

            snapMode: SnapMode.LeadingEdge

            listItemComponents: [
                ListItemComponent {
                    type: "unit_list"
                    QuantitySelectList {
                    }
                }
            ]

            attachedObjects: [
                ImagePaintDefinition {
                    id: background_typeA
                    imageSource: "asset:///images/typeA.png"
                },
                ImagePaintDefinition {
                    id: background_typeB
                    imageSource: "asset:///images/typeB.png"
                },
                ImagePaintDefinition {
                    id: background_typeC
                    imageSource: "asset:///images/typeC.png"
                },
                ImagePaintDefinition {
                    id: background_typeD
                    imageSource: "asset:///images/typeD.png"
                },
                ImagePaintDefinition {
                    id: background_typeE
                    imageSource: "asset:///images/typeE.png"
                }
            ]

            onCreationCompleted: {
                // fill the quantity select set
                dataModel.insert({
                        "position": 0,
                        "unit": "typeA",
                        "background": background_typeA.imagePaint
                    });
                dataModel.insert({
                        "position": 1,
                        "unit": "typeB",
                        "background": background_typeB.imagePaint
                    });
                dataModel.insert({
                        "position": 2,
                        "unit": "typeC",
                        "background": background_typeC.imagePaint
                    });
                dataModel.insert({
                        "position": 3,
                        "unit": "typeD",
                        "background": background_typeD.imagePaint
                    });
                dataModel.insert({
                        "position": 4,
                        "unit": "typeE",
                        "background": background_typeE.imagePaint
                    });
            }

            function itemType(data, indexPath) {
                return "unit_list";
            }
        }
    }
}

and (QuantitySelectList.qml):

import bb.cascades 1.0

Container {
    id: quantity_container

    maxHeight: 300
    maxWidth: 300

    background: ListItemData.background

    ListView {
        id: quantity_list

        maxHeight: 300
        maxWidth: 300

        signal updateQuantity(variant quantity_index_path)

        layoutProperties: StackLayoutProperties {
            spaceQuota: 1
        }

        dataModel: GroupDataModel {
            grouping: ItemGrouping.None
            sortingKeys: [ "position" ]
            objectName: "quantity_select_set"
        }

        snapMode: SnapMode.LeadingEdge

        listItemComponents: [
            ListItemComponent {
                type: "quantity"
                Container {
                    id: quantity_view

                    minHeight: 300
                    minWidth: 300

                    attachedObjects: [
                        TextStyleDefinition {
                            id: quantity_text_style
                            base: SystemDefaults.TextStyles.SubtitleText
                            color: Color.Black
                            fontWeight: FontWeight.Normal
                            fontSize: FontSize.PointValue
                            fontSizeValue: 36.0
                        }
                    ]

                    horizontalAlignment: HorizontalAlignment.Fill
                    verticalAlignment: VerticalAlignment.Fill

                    Label {
                        text: ListItemData.amount
                        horizontalAlignment: HorizontalAlignment.Center
                        verticalAlignment: VerticalAlignment.Center
                        textStyle {
                            base: quantity_text_style.style
                        }
                    }
                }
            }
        ]

        onCreationCompleted: {
            // fill the quantity select set
            // if (ListItemData.unit == "typeA") {
            if (ListItemData.position == 0) {
                for (var a = 1; a < 11; a ++) {
                    dataModel.insert({
                            "amount": a,
                            "position": a
                        });
                }
            } else if (ListItemData.unit == "typeB") {
                for (var a = 1; a < 11; a ++) {
                    dataModel.insert({
                            "amount": 0.1 * a,
                            "position": a
                        });
                }
            } else if (ListItemData.unit == "typeC") {
                for (var a = 1; a < 16; a ++) {
                    dataModel.insert({
                            "amount": a,
                            "position": a
                        });
                }
            } else if (ListItemData.unit == "typeD") {
                for (var a = 1; a < 11; a ++) {
                    dataModel.insert({
                            "amount": a,
                            "position": a
                        });
                }
            } else if (ListItemData.unit == "typeE") {
                for (var a = 1; a < 11; a ++) {
                    dataModel.insert({
                            "amount": 0.5 * a,
                            "position": a
                        });
                }
            }
        }

        function itemType(data, indexPath) {
            return "quantity";
        }
    }
}

The problem is that some lists are not displayed with the data sets as they should. If I start it that I see for example typed list and list of typeB have converted their data sets. If I scroll quickly, it can happen then another two lists take their data sets. How can this happen?

ListView reuses it is ListItemComponents. Do not trust onCreationCompleted in QuantitySelectList, she will not be called when the re-use of components.

A possible workaround is detect when ListItemData changes and repopulate QuantitySelectList. This thread has an example:

http://supportforums.BlackBerry.com/T5/Cascades-development/how-to-detect-when-ListView-recycles-an-...

ListItem.onDataChanged: {
}

I have not tried.

Another thread suggests binding to a specific property of the ListItemData, but previous approach is better if it works:

http://supportforums.BlackBerry.com/T5/Cascades-development/QML-reset-properties-when-ListItemCompon...

In my projects, I generally implement lists in C++. There is a method that is called on the reuse of element.

Tags: BlackBerry Developers

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