ListView / DataModel crash

Similar Questions

• dynamically create and bind datamodel and listview

  Hello

  I looked through forums and examples, but in all the listview/datamodel example are linked since the start of the application only. I need to create and link dynamically. Because my data listview will depend on the selection of the previous shape. Need to do using qml. Can someone help me?

  I have not seen that your souce code can only guess the possibility.

  You have set the query, like "query:" / xxx/yyy "? You can add the journal to your custom data source to check the loop iteration of data?

  If you can show your brief source code, it willl be quick analysis.

• very simple custom DataModel derived from bb::cascades:DataModel will not display data in ListView

  Hello

  A model of custom data in C++, I did nothing appears in a ListView

  It seems that the link

  listView.dataModel = _dataModel

  on QML side don't ask the DataModel data. I'm not really sure what I'm doing wrong.

  PS. Place the CustomDataModel in QML as an attachedObject and insert data it works, but I have a specific need to keep the DataModel in C++.

  Below the example of code reduced to the simplest case which cause me problem:

  //customdatamodel.h
  
  #include 
  #include 
  #include 
  
  class CustomDataModel : public bb::cascades::DataModel
  {
  Q_OBJECT
    public:
      CustomDataModel(QObject * parent=0) : bb::cascades::DataModel(parent)
      {
      }
      virtual void ~CustomDataModel()
      {
      } 
  
      virtual int CustomDataModel::childCount(const QVariantList& indexPath)
      {   //just one level deep
          return 0;
      }
  
      virtual bool CustomDataModel::hasChildren(const QVariantList& indexPath)
      {
          return childCount(indexPath) > 0;
      }
  
      virtual QVariant CustomDataModel::data(const QVariantList& indexPath)
      {
          if (indexPath.count() == 1)
          {
              return m_values[indexPath[0].toInt()];
          }
          return QVariant();
      }
  
      void CustomDataModel::insert(const QVariantMap &item)
      {
           m_values.append(item);
           emit itemAdded(QVariantList() << m_values.count()-1);
      }
  
      private:
        QVariantList m_values;
  }
  
  //application.cpp
  
  ApplicationUI::ApplicationUI(bb::cascades::Application *app)
  : QObject(app)
  {
      qmlRegisterType("app.datamodels", 1,0, "CustomDataModel");
      QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
  
      CustomDataModel *dataModel = new CustomDataModel(this);
  
      QVariantMap map;
      map["field"] = "value1";
      dataModel->insert(map);
  
      map = QVariantMap();
          map["field"] = "value2";
      dataModel->insert(map);
  
      map = QVariantMap();
      map["field"] = "value3";
      dataModel->insert(map);
  
      qml->setContextProperty("_dataModel", dataModel);
  
      AbstractPane *root = qml->createRootObject();
      app->setScene(root);
  }
  
  //main.qml
  
      Page {
          Container {
              layout: DockLayout {
              }
  
              ListView {
                  id:listView
                  dataModel: _dataModel
  
                  function itemType(data, indexPath)
                  {
                      if (indexPath.length == 1)
                      {
                          return "item";
                      }
                  }
  
                  listItemComponents: [
  
                      ListItemComponent {
                          type: "item"
                          StandardListItem {
                              title: ListItemData.field
                          }
                      }
                  ]
              }
          }
      }
  

  Hello
  You always return a zero childCount, so he thinks that the template is empty.

• findChild custom datamodel

  Hello

  I know how to recover a QML from C++ object. For example, if myObj is a component TextArea, I can change the text like this:

  QObject *obj = appPage->findChild("myObj");
  if (myObj){
      myObj->setProperty("text", "hello");
  }
  

  Now, I would get the DataModel for a ListView, which is a custon DataModel:

  ListView {
      dataModel: searchModel
  ...
  }
  
  attachedObjects: [
  
      SearchModel {
          id: searchModel
          jsonAssetPath: "app/native/assets/appsearch.json"
          filter: "All categories"
      }
  ]
  

  At least, my SearchModel has one public slot: void updateListWebviews (const QString text);

  I want to trigger the updateListWebviews slot in a function of the CPP. Could you help me to achieve this please?

  Thanks for your help,

  Laurent

  You can access 'qml objects' very well, behind the scenes, they are ordinary objects in c ++.

  You can call a qml method using QMetaObject::invokeMethod

  You can also connect a signal c ++ in qml and just send the signal to your user interface. I judge that the most elegant solution.

• ListView and the height of a CustomListItem

  I have created a ListView with a CustomListItem. The code looks like the following:

  ListView {
      dataModel: myDataModel
      listItemComponents: [
          ListItemComponent {
              type: "item"
              CustomListItem {
                   Container {
                      layout: StackLayout {}
                      TextArea {
                          text: ListItemData.data
                          multiline: true
                      }
                      TextArea {
                          text: ListItemData.data2
                          multiline: true
                      }
                  }
              }
          }
      ]
  }
  

  I came across this problem recently. I suggest to create a personalized yourself list item and do not use the CustomListItem class, I think it is buggy in that regard.

• 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)
  

• How to get the content of the list item selected ListView using CPP?

  Hello

  I do a simple application, get the content of the list item selected ListView using CPP, in the main.qml file, I created a listview using XMLDataModel and I got the selected listview using dataModel.data (row) .attributeNameInXmlfile in qml. content as in the same way the ListView using cpp.please help me I want to get the content of the listitem selected.

  Here is my code

  hand. QML

  import bb.cascades 1.0
  
  Page {
      content: Container {
          id: mainContainer
          objectName: "container"
          // property alias selectedText: selectedTextField.text
          //property alias deselectedText: deselectedTextField.text
          ListView {
              objectName: "listView"
              dataModel: XmlDataModel {
                  source: "models/items.xml"
                  id: model
              }
              listItemComponents: [
                  ListItemComponent {
                      type: "item"
                      StandardListItem {
                          title: ListItemData.title
                      }
                  }
              ]
          }
          TextField {
              id: selectedTextField
              objectName: "selectedTextField"
              text: ""
          }
          TextField {
              id: deselectedTextField
              objectName: "deselectedTextField"
              text: ""
          }
      }
  }
  

  App.cpp

  #include "app.hpp"
  
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  using namespace std;
  
  using namespace bb::cascades;
  QObject *textFieldSelected ;
  QObject *textFieldNotSelected;
  QObject *list;
  App::App() {
      QmlDocument *qml = QmlDocument::create("main.qml");
      AbstractPane *root = qml->createRootNode();
      list = root->findChild("listView");
      textFieldNotSelected = root->findChild("deselectedTextField");
      textFieldSelected = root->findChild("selectedTextField");
      QObject::connect(list,SIGNAL(selectionChanged (QVariantList, bool)),this,SLOT(changeText(QVariantList, bool)));
      Application::setScene(root);
  }
  
  void App::changeText(QVariantList indexPath,bool selected) {
  
  }
  

  App.HPP

  #ifndef APP_H
  #define APP_H
  
  #include 
  #include 
  #include 
  
  /*!
   * @brief Application GUI object
   */
  class App : public QObject
  {
      Q_OBJECT
  public:
      App();
  public slots:
  void changeText(QVariantList ,bool );
  
  };
  
  #endif // ifndef APP_H
  

  Try this.

  void App::changeText(QVariantList indexPath,bool selected) {
      XmlDataModel *model = (XmlDataModel *)list->dataModel();
      QVariantMap map = model->data(indexPath).toMap();
      // map is your data in QVariant
      qDebug() << map["title"].toString();
  }
  

• ListView and ListItem displaying funny

  How is it when I have my. XML directly in my ListView, all list items display correctly, but if I add data to a data source, it is not.

  Example below because I can't explain it very well.

  ListView {
              dataModel: XmlDataModel {
                  source: "hills.xml"
              }
              listItemComponents: [
                  ListItemComponent {
                      type: "listItem"
                      StandardListItem {
                          title: ListItemData.skiHill
                      }
                  },
                  ListItemComponent {
                      type: "header"
                      Header {
                          title: ListItemData.key
                          touchPropagationMode: TouchPropagationMode.None
                      }
                  }
  

  Vs.

  ListView {
              dataModel: dataModel
              listItemComponents: [
                  ListItemComponent {
                      type: "listItem"
                      StandardListItem {
                          title: ListItemData.skiHill
                      }
                  },
                  ListItemComponent {
                      type: "header"
                      Header {
                          title: ListItemData.key
                          touchPropagationMode: TouchPropagationMode.None
                      }
                  }
  
  ...
  
  attachedObjects: [
          GroupDataModel {
              id: dataModel
              sortingKeys: [
                  "skiHill"
              ]
          },
          DataSource {
              id: dataSource
              source: "hills.xml"
              query: "/root/listItem"
              onDataLoaded: {
                  dataModel.insertList(data);
              }
          }
  

  On the 2nd day of two different types of lists, the list item displays the news from another part of my XML, not the name of ski hill.

  Your head should look like:

   ListItemComponent {
                      type: "header"
                      Header {
                          title: ListItemData
                          touchPropagationMode: TouchPropagationMode.None
                      }
                  }
  

  i.e. just use ListItemData for the title - because since a GroupDataModel (and probably XmlDataModel) the first level of the row is always returned as a string, not as a piece of real data that has properties

  ListItemComponent {
                      type: "item"
                      StandardListItem {
                          title: ListItemData.skiHill
                      }
                  },
  

  Your list items must have the type 'point' - because that's what indicates the GroupDataModel.

  You can substitute by using a reminder in QML itemType(), if you need something different, or if you need a mixture of different types in the list

• Child parsing JSON with datasource and view in listview

  Hi, I use datasource to get json from url data and I want in the listview, but json data have child, so I don't know how to access.

  My data source code here:

  DataSource {
          id: serviceDataSource
          source: "http://services.okezone.com/json/headline"
          type: DataSourceType.Json
          onDataLoaded: {
              serviceDataModel.clear();
              serviceDataModel.insertList(data)
          }
      }
  

  And here my display list code:

  ListView {
            dataModel: serviceDataModel
            listItemComponents: [
  
                 ListItemComponent {
                        type: "news"
                        ServiceDetail {
                               title: ListItemData.title
                               pubDate: ListItemData.published
                        }
                 }
            ]
   }
  

  And here is the response from json to this url:

  [
  
  {
  
    "okezone": {
  
       "version": "0.1",
  
       "headline": {
  
          "request": {
  
             "channel": 0,
  
             "start": 0
  
          },
  
          "status": "OK",
  
          "more": {
  
             "offset": 2,
  
             "start": 0,
  
             "total": 2
  
          },
  
          "news": {
  
             "type": "2",
  
             "id": "796135",
  
             "channel": {
  
                "id": "519",
  
                "label": "Surabaya"
  
             },
  
             "published": "2013-04-23 13:21:25",
  
             "title": "Gara-Gara UN, Mendikbud Didesak Mundur",
  
             "summary": "Para orangtua murid menilai, Mendikbud, Muhammad Nuh, harus bertanggung jawab di balik kesemerawutan sistem dan pelaksanaan Ujian Nasional.",
  
             "thumbnail": "http://img.okeinfo.net/images-data/content/2013/04/23/519/796135/BkuPxui4gB.jpg",
  
             "url": "http://services.okezone.com/json/detail/2013/04/23/519/796135"
  
          }
  
       }
  
    }
  
  }
  ]
  

  Thanks for your help, I do it in two days and does not work.

  Hello

  Try this code

  import bb.cascades 1.0
  import bb.data 1.0
  
  Page {
      content: Container {
          Label {
              text: "List View with json parsing"
          }
  
          ListView {
              id: listViewDemo
              dataModel: GroupDataModel {
                  grouping: ItemGrouping.None
              }
  
              listItemComponents: [
                  ListItemComponent {
                      type: "listItem"
                      StandardListItem {
                          title: ListItemData.okezone.headline.news["title"]
                      }
                  }
              ]
  
              function itemType(data, indexPath) {
                  return "listItem";
              }
          }
      }
  
      attachedObjects: [
          DataSource {
              id: serviceDataSource
              source: "http://services.okezone.com/json/headline"
              type: DataSourceType.Json
              onDataLoaded: {
                  listViewDemo.dataModel.clear();
                  listViewDemo.dataModel.insertList(data)
              }
          }
      ]
  
      onCreationCompleted: {
          serviceDataSource.load();
      }
  }
  

  Don't forget to add the library to .pro file

  LIBS +=-lbbdata

  

• Looking for example SQL to group ListView

  I'm looking for some examples showing how to connect the SQL bb::data :ataAccessReply to a ListView dataModel so that I can have headers for the returned items where the headers are part of the returned SQL data.

  For example

  Data in the table :

  Row1 [col1:A, col2:1,...]

  row2 [col1:A, col2: 2,...]

  row3 [col1:B, col2: 1,...]

  row4 [col1:B, col2: 2,...]

  ListView expected created from the dataModel:

  headerItem: has

  listItem1: title = 1, description =..., status =...

  listItem2: 2, description =..., status =...

  headerItem: B

  listItem3: 1, description =..., status =...

  listItem3: 2, description =..., status =...

  It seems to me something as a "group by" device to create the elements of headers.  But it is is not clear to me that I have to do to get there.

  Take a look at GroupDataModel. I think it will meet your needs.

  http://developer.BlackBerry.com/native/reference/Cascades/bb__cascades__groupdatamodel.html

• number of lines in the ListView blackberry stunts QML

  Hi all

  I have a ListView in QML page that contains several elements.

  I also want to display the total number of lines on the bottom of the page.

  Please tell me how.

  View the list code is as below: -.

   //! [1]
                  // The list view with all messages
                  ListView {
                      dataModel: _messages.model
  
                      listItemComponents: ListItemComponent {
                          type: "item"
  
                          StandardListItem {
                              title: ListItemData.senderName
                              description: ListItemData.sender
                              status: ListItemData.time
                          }
                      }
  
                      onTriggered: {
                          clearSelection()
                          select(indexPath)
  
                          _messages.setCurrentMessage(indexPath)
  
                          _messages.viewMessage();
                          navigationPane.push(messageViewer.createObject())
                      }
                  }
                  //! [1]
  

  Please suggest

  call on the datamodel size()

• Can't get multiple selections of work ListView

  The example code here seems very simple:

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

  I use the code example to use with ListView as my model:

              ListView {
                  id: listView
                  objectName: "listView"
                  dataModel: photosModel.photoGridModel
  
                  snapMode: SnapMode.LeadingEdge
  
                  layout: GridListLayout {
                      id: gridListLayout
                      objectName: "gridListLayout"
                  }
  
                  onTriggered: {
                      var newPage = photosPageDefinition.createObject();
                      photosModel.setPage(newPage);
                      navigationPane.push(newPage);
                      navigationPane.peekEnabled = false;
                      photosModel.launchFullscreen(indexPath);
                  }
  
                  multiSelectAction: MultiSelectActionItem {}
  
                  multiSelectHandler {
                      // These actions will be shown during multiple selection, while this
                      // multiSelectHandler is active
                      actions: [
                          ActionItem
                          {
                              title: "Tag"
                              imageSource: "asset:///images/tag.png"
                              onTriggered: {
                                  // TODO
                              }
                          },
                          ActionItem
                          {
                              title: "Share"
                              imageSource: "asset:///images/share.png"
                              onTriggered: {
                                  // TODO
                              }
                          },
                          ActionItem
                          {
                              title: "Move"
                              imageSource: "asset:///images/folder.png"
                              onTriggered: {
                                  // TODO
                              }
                          },
                          DeleteActionItem
                          {
                          }
                      ]
  
                      status: "None selected"
  
                      onActiveChanged: {
                          if (active == true) {
                              console.log("Multiple selection is activated");
                          }
                          else {
                              console.log("Multiple selection is deactivated");
                          }
                      }
  
                      onCanceled: {
                          console.log("Multi selection canceled!");
                      }
                  }
              }
  

  When loading the application, I long press on an item in the GridView control and nothing happens.

  Can you clarify what this means 'does not '?.

  EDIT:

  OK, now I see. To make it work, you must set an empty or nonempty ActionSet for each listitem.

  StandardListItem {
      title: ListItemData.title
      contextActions: [
          ActionSet {
          }
      ]
  }
  

  Now, it will work.

• ListView with GridListLayout will not display items

  I can easily create a ListView that displays its items.

  The following XML code:

  And here's the QML:

              ListView {
                  dataModel: XmlDataModel {
                      source: "asset:///test.xml"
                  }
  
                  listItemComponents: [
                      ListItemComponent {
                          type: "header"
                          Header {
                              title: ListItemData.title
                          }
                      },
                      ListItemComponent {
                          type: "item"
                          Label {
                              text: ListItemData.name
                          }
                      }
                  ]
              }
  

  The result looks like this:

  

  But what I really want are the items to display in a grid. To do this, I put the ListView layout property to a GridListLayout:

                  layout: GridListLayout {
                  }
  

  When I do that, it shows more elements, only the headers:

  

  What I am doing wrong?

  In the end I tried to get this working using a custom LitemItemProvider that uses images for the elements, but even once, it would display only the headers.  So I simplified my example as much as I can above to try to identify the problem.  I don't know how to do the simple example.  I am able to get my original code works fine even with the GridListLayout if I do not activate the grouping - as soon as I activate the grouping (so that the data has headers and elements), it starts to behave like that.

  The display of the grid is not compatible with the Group?  The application of native images only grouping with a grid view, and I am trying to imitate that.  Super confused.

  You must set headerMode

  https://developer.BlackBerry.com/native/reference/Cascades/bb__cascades__gridlistlayout.html#propert...

• How can I place a listview in a listview?

  Hello everyone.

  I do an application on my website and I would like to have an area featured inside, but I found a big problem when I try to add the recommended area to the main Listview (where the post is loaded).

  It is an example of what he would like to see inside my application:

  

  So I want to spend the "Star box" and "Feeding zone" at the same time, when the user tries to scroll vertically.

  I tried to use a ScrollView but the priority of scrolling is in vertical listview and the recommended area does not scroll only when the vertical scroll listview is finished.

  Could someone give me a suggestion?

  See you soon!

  I don't think we have an example that does exactly what you want, but basically, you could create a CustomListItem contains inner ListView.  You would need a second source of data for inner ListView or have the first element of your main data source to be another source of data.

  The main ListView could choose the ListItem to display based on a type item in the data source main or you could rely on the position. forumThreadList.qml shows how you can override the itemType method to select the type of item (if it is not defined in the original data source).  This example also shows how to use a CustomListItem, but not one that contains a ListView.

  Here is another example that shows a part of the implementation.  It would have a horizontal ListView in all the ranks of the main list.  If you combine these two you should be able to get what you are looking for.  Let me know if you have any questions along the way.

  import bb.cascades 1.2
  
  // creates one page with a label
  Page {
      attachedObjects: [
          //ComponentDefinition doesn't work because DataModel doesn't extend BaseObject
          ArrayDataModel {
              id: dm2
          },
          ArrayDataModel {
              id: dm3
          }
      ]
      Container {
          ListView {
              dataModel: ArrayDataModel {
                  id: dm
              }
              listItemComponents: [
                  ListItemComponent {
                      Container {
                          layout: StackLayout {
                              orientation: LayoutOrientation.TopToBottom
                          }
                          ListView {
                              preferredHeight: 100
                              //Thankfully the QVariant is a DataModel, so this works :)
                              dataModel: ListItemData
                              layout: StackListLayout {
                                  orientation: LayoutOrientation.LeftToRight
                              }
                              listItemComponents: [
                                  ListItemComponent {
                                      Container {
                                          layout: StackLayout {
                                              orientation: LayoutOrientation.LeftToRight
                                          }
                                          Label{
                                              text: ListItemData +"\t|\t"
                                          }
                                      }
                                  }
                              ]
                          }
                          Divider {}
                      }
                  }
              ]
          }
      }
      onCreationCompleted: {
          dm2.append(["This is","another list","inside of","the first one"])
          dm3.append(["<( \" <) <( \" <) <( \" <)","(^\"^) (^\"^) (^\"^)","(> \" )> (> \" )> (> \" )>","(^\"^) (^\"^) (^\"^)","(> \" )><( \" )><( \" <)","(^\"^) (^\"^) (^\"^)","<( \" <) (>\"<) (> \" )>","(v' 'v) (v' 'v) (v' 'v)"])
  
          dm.append(dm2)
          dm.append(dm3)
      }
  }
  

• Update of ListView dummy image using images from URL http

  Hi guys...

  Please help me with this.

  I have created a ListView in QML file and filled with data received from a webservice. Since this web service provides all the images, I have to place a dummy image at this location. Then I used another method to retrieve images of the url. Now, I got the image in my CPC file. But I could not update my listview. I tried several methods. But failed.

  Here is my code snippet.

   ListView {
                  id: listView
                  objectName: "listView"
  
                  dataModel: ArrayDataModel {
                      id: myListModel
  
                  }
  
                  // Override default GroupDataModel::itemType() behaviour, which is to return item type "header"
                  listItemComponents: ListItemComponent {
                      id: listcomponent
                      // StandardListItem is a convivience component for lists with default cascades look and feel
                      StandardListItem {
                          title: ListItemData.postText
                          description: ListItemData.postDate
                          status: ListItemData.filePath
                          imageSource: "asset:///images/4.png"
                      }
  
                  }
                  layoutProperties: StackLayoutProperties {
                      spaceQuota: 1.0
                  }
                  horizontalAlignment: HorizontalAlignment.Fill
                  verticalAlignment: VerticalAlignment.Fill
  
              }
  

  In the PRC, I get my image like this.

  void PostHttp::imageFetcher(){
  const QUrl url("http:///828/828_20135312012288.png");
  if (flag1 == true) {
      get(url);
  }
  }
  void PostHttp::onImageReply(){
      QNetworkReply* reply = qobject_cast(sender());
      QString response;
      QImage img;
      QString filePathWithName = "data/img/";
      QString imageName;
  
      if (reply) {
              if (reply->error() == QNetworkReply::NoError) {
                  flag1 = false;
                  const int available = reply->bytesAvailable();
                  if (available > 0) {
                  const QByteArray buffer(reply->readAll());
                  response = QString::fromUtf8(buffer);
                  img.loadFromData(buffer);
                  img = img.scaled(40, 40, Qt::KeepAspectRatioByExpanding);
                  const QImage swappedImage = img.rgbSwapped();
                  const bb::ImageData imageData = bb::ImageData::fromPixels(
                          swappedImage.bits(), bb::PixelFormat::RGBX,
                          swappedImage.width(), swappedImage.height(),
                          swappedImage.bytesPerLine());
                  bb::utility::ImageConverter::encode(QUrl(QDir::currentPath() + "/shared/camera/img.png"), imageData, 75);
                  qDebug()<<"current path is "<
  Thanks in advance
  			 
  You can pass a QByteArray of image data coded directly to an imageView in the image property, set of QVariant::fromValue (). However, in your case you can place the uri to which you saved the image and not the bytes. Advantage: cascades puts these images in cache. If you use deterministic file names, you can avoid any networking calls or loading of images when only the populated list of point sier after be recycled.
  
  img.loadFromData(buffer);
  img = img.scaled(40, 40, Qt::KeepAspectRatioByExpanding);
  img.save(QDir::currentPath() + "/shared/camera/img.png"), 0, 75);
  
  QImage can do all this for you, without permutation of bytes.
  All you have to do is then updated the datamodel.