[QML] redefine properties when ListItemComponent is reused

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  If not more specific/bright suggestions appear, you can try the list:

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  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.

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  import bb.cascades 1.0
  
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              maxWidth: 300
  
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                      id: background_typeE
                      imageSource: "asset:///images/typeE.png"
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              ]
  
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                          "position": 0,
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                      });
                  dataModel.insert({
                          "position": 1,
                          "unit": "typeB",
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                  dataModel.insert({
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                          "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.

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