replaceItem vs updateItem

Similar Questions

• LCDS application on updateItem error

  Hi all
  
  I'm having a problem with LCD screens.
  My application is almost copied from the sample application echantillon8-> data management service. I can recover the data to the DataGrid in my MySQL server, but the update does not work. The object returned by the customer is not produced, but for some reason flex.messaging.io.amf.ASObject
  
  Here the correction of my application:
  Object type: flex.messaging.io.amf.ASObject
  Field1: private boolean flex.messaging.io.amf.ASObject.inHashCode
  Field2: private boolean flex.messaging.io.amf.ASObject.inToString
  field3: java.lang.String flex.messaging.io.amf.ASObject.namedType
  
  the same debugging for the application of echantillon8:
  Object type: flex.samples.product.Product
  Field1: private java.lang.String flex.samples.product.Product.name
  Field2: private java.lang.String flex.samples.product.Product.description
  field3: private java.lang.String flex.samples.product.Product.image
  Field4: private java.lang.String flex.samples.product.Product.category
  sphere5: private double flex.samples.product.Product.price
  case Field6: private int flex.samples.product.Product.qtyInStock
  
  so I get a classcastexception for the line in the ProductAssembler.java - function updateItem:
  Boolean success = service.update ((Product) newVersion);
  
  I think it's ok because the versionnew is not produced, but ASObject.
  
  But why the versionnew is ASObject and why not the product as in the sample application?
  
  THX

  I solved the problem... After days of coding...
  First of all, I forgot to add to my MXML file the tag to reference the Product.as, so the client returns the ASObject instead of product.
  After that, I got a stack overflow error. The problem is that I had the same name for Product.as and Product.mxml.
  Renamed the mxml and now the update works correctly.

  Happy coding!

• GroupDataModel - update the Chronogram of loop without going through a row.

  Hello

  I need to update a child recordset within a GroupDataModel. At first, I update the selected record, but there may be a notebook of the child requiring an update of data in order to take account of the appropriate user interface.

  So I loop trought all of my folders and find those corresponding, but the problem I do face is updateItem() method requires a row position. I guess I have to build the path to the index? Or y at - it another way to update the corresponding records?

    // Extract all records
    QList records = m_dataModel->toListOfMaps();
  
    // Loop and start looking for any possible match
    for (int i = 0 ; i < records.size(); i++)
    {
      QVariant record = records.at(i);
      QVariantMap map = record.toMap();
  
      if ()
      {
        map["myField"] = QVariant("Updated Record");
        // UpdateItem requires an indexPath... but since I'm looping throught       // each item the indexPath is unknown.      //m_dataModel->updateItem(indexPath, itemMap);
      }
    }
  

  OK, thanks for the pointer... I did some research some of the example project, but @ the end I found this thread...

  https://supportforums.BlackBerry.com/T5/native-development/GroupDataModel-how-to-find-an-item-and-GE...

  ... and @ there end, I used this approach:

    // Extract all records  QList records = m_dataModel->toListOfMaps();
  
    // Loop and start looking for any possible match  for (int i = 0 ; i < records.size(); i++)  {    QVariant record = records.at(i);    QVariantMap map = record.toMap();
  
      if ()    {      // Search for this matching record...      QVariantMap matchMap;      matchMap["Field1"] = map.value("Field1").toString();      matchMap["Field2"] = map.value("Field2").toString();      matchMap["Field3"] = map.value("Field3").toInt();      QVariantList indexPath = m_dataModel->lowerBound(matchMap);
  
        // Now that we have determined the index path, we must update the record...      QVariantMap itemMap = m_dataModel->data(indexPath).toMap();      itemMap["FieldToUpdate"] = QVariant("Updated Record"));      m_dataModel->updateItem(indexPath, itemMap);    }  }  
  

• How to upgrade an item in the ListView ListItemComponent

  Hello

  I have a ListView that uses an ArrayDataModel and a ListItemComponent to display a list of items. One of the elements which is display is a photo that takes place is specified as a URI.  In some cases, this URI is empy and I need to go out and scratch a few location data in real time.  Within the netscrape2:nEffectuer slot, I am trying to take this new found data (URL location to the new location of the photo) and replace it in my ListView. ListItemComponent...

  Any help would be greatly appreciated.  Thanks in advance...

  Container {
              leftPadding: 10.0
              rightPadding: 10.0
              topPadding: 40.0
              ListView {
                  function scrapePicture( ExternalUrl, source, mListItemIndexPath )
                  {
                      console.log("Start Search scrapePicture(): " + ExternalUrl );
                      console.log("Start Search scrapePicture() Index: " + Index );
                      netscrape2.scrapeSite(ExternalUrl, source, mListItemIndexPath );
                  }
                  id: searchListView
                  dataModel: searchDataModel
                  listItemComponents: [
                      ListItemComponent {
                          id: listComponentSearchResultsListItem
                          type: ""    // I do this because its Array datamodel
                          SearchResultsListItem {
                              title: ListItemData.Title
                              pubDate: ListItemData.TimeStamp + " - " + ListItemData.Location
                              previewImage: ( ListItemData.PreviewImage == "" ) ? ListItem.view.scrapePicture( ListItemData.ExternalUrl, ListItemData.Source, ListItem.indexPath ) : ListItemData.PreviewImage
                          }
                      }
                  ]
                  onTriggered: {
                      console.log("Invoke Second Page");
                      var feedItem = searchDataModel.data(indexPath);
                      // invoke second page...
                  }
                  attachedObjects: [
                      ScrapeHttp {
                          id: netscrape2
                          onComplete: {
                              // this is where I want to replace the picture...
  
                              var data =  listComponentSearchResultsListItem.ListItem.view.dataModel.data(netscrape2.mListItemIndexPath);
                              console.log("netscrape2.data: " + data);
                              data.PreviewImage = netscrape2.adImageURL;
                              console.log("netscrape2.data2: " + data);
                              listComponentSearchResultsListItem.ListItem.view.dataModel.replace(0, data);
                          }
                      }
  
                  ]
              } // end of ListView
  

  Why all this way?

  listComponentSearchResultsListItem.ListItem.view.
  

  The above code is only necessary when you want to access the data of ItemComponent, but you try to change DataModel.

  You must change the value in your DataModel, in your case, its ID is searchDataModel. No what you have to do is something like this in your onComplete:

  var tmpData = searchDataModel.data(indexPath);
  tmpData.PreviewImage = netscrape2.adImageURL;
  searchDataModel.updateItem(indexPath, tmpData);
  

  Now I don't know what is ScrapeHttp, but it sounds like a weird way of this row.

  netscrape2.mListItemIndexPath
  

• Error "Index out of range" on search query

  I have a configuration of search query to clear my listview and insert new results of the query in the listview. The code looks like this:

  {OnDataLoaded}

  _APP. Clearlist

  root. ListView.insertlist (Data)

  }

  {OnQueryChanged}

  Load();

  }

  But unfortunately, whenever I do a query, and as a result appears my query update (triggered from a contextual menu) does not work and gives me the error "Index out of range". Even if the results of the query to fill listview very well and when I tap on a result it shows all data fine as well.

  And FYI the update query does not work when the list is not be searched or filtered so I don't think that there is a problem with my function.

  What I am doing wrong?

  He solved.  The problem is that the update function trying to remove and add the updated item within the filtered datamodel causing problems.  I just got the datamodel to load before performing the functions as described below:

  bool App::updateObject(const QString &id, const QString &name, const QString &description, const QString &datefield, const QString &lat, const QString &lon, const QString &categoryfield, const QString &mapurl, const QString &itempic)
  {
      bool updated = false;
      bool saved = false;
  
  //    if (!validateID(id))
  //        return false;
  
      Location *location = new Location(id, name, description, datefield, lat, lon, categoryfield, mapurl, itempic);
  
      // Find location in the datamodel.
      // Only the id is used by find(). This is because location
      // defines equality (==) as having the same id. (See the definition of "=="
      // in the location class.)
      const QVariantList updateIndexPath = m_dataModel->find(location);
  
      // update the item if found
      if (updateIndexPath.isEmpty()) {
          alert(tr("Object ID not found."));
          updated = false;
      } else {
          load();
          updated = m_dataModel->updateItem(updateIndexPath, location);
      }
  
      // Save the datamodel if we updated something.
      if (updated) {
          m_storage->deleteFromDB(id);
          saved = m_storage->save(m_lastCustomerID, m_dataModel);
          load();
          refreshGroup();
  
      }
  
      return (updated && saved);
  }
  

• How QMetaObject::invokeMethod solved: no method bb::cascades:QmlListView error?

  Hi all

  When I try to call QMetaObject::invokeMethod at that time where I get error below.

  "QMetaObject::invokeMethod: no such bb::cascades:QmlListView:detailNews (QVariant) method.

  Down here I have attached a code please check and let me know how I can fix this issue?

  ApplicationUI.cpp

  NewsList.cpp

  #include "applicationui.hpp"
  
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  
  using namespace bb::cascades;
  using namespace bb::data;
  
  QString getValueByKey(QVariant qVariant, QString qStrKey);
  QString getValueByKey(QVariant qVariant, QString qStrPath, QString qStrKey);
  QVariantList getListByPath(QVariant qVariant, QString qStrPath);
  
  ApplicationUI::ApplicationUI(bb::cascades::Application *app) :
          QObject(app), root(0)
  {
      // prepare the localization
      m_pTranslator = new QTranslator(this);
      m_pLocaleHandler = new LocaleHandler(this);
  
      bool res = QObject::connect(m_pLocaleHandler, SIGNAL(systemLanguageChanged()), this,
              SLOT(onSystemLanguageChanged()));
      // This is only available in Debug builds
      Q_ASSERT(res);
      // Since the variable is not used in the app, this is added to avoid a
      // compiler warning
      Q_UNUSED(res);
  
      // initial load
      onSystemLanguageChanged();
  
      // Create scene document from main.qml asset, the parent is set
      // to ensure the document gets destroyed properly at shut down.
      /* QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
  
       // Create root object for the UI
       AbstractPane *root = qml->createRootObject();
  
       // Set created root object as the application scene
       Application::instance()->setScene(root);*/
      QmlDocument *qmlLoadingDialog = QmlDocument::create("asset:///LoadingDialog.qml").parent(this);
      dialogLoading = qmlLoadingDialog->createRootObject
  ();
      languageLocalList = languageList();
      home_Page();
  }
  
  void ApplicationUI::onSystemLanguageChanged()
  {
      QCoreApplication::instance()->removeTranslator(m_pTranslator);
      // Initiate, load and install the application translation files.
      QString locale_string = QLocale().name();
      QString file_name = QString("Godfessions_%1").arg(locale_string);
      if (m_pTranslator->load(file_name, "app/native/qm")) {
          QCoreApplication::instance()->installTranslator(m_pTranslator);
      }
  }
  
  void ApplicationUI::home_Page()
  {
      QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
      //QmlDocument *settingqml = QmlDocument::create("asset:///Setting_Page.qml").parent(this);
      qml->setContextProperty("app", this);
      root = qml->createRootObject();
      m_newListView = root->findChild("newsListView");
      root->setParent(this);
      Application::instance()->setScene(root);
  
      showLoadingDialog();
      getCategories("12143");
      newsListWebServices("12143");
      closeLoadingDialog();
  }
  
  void ApplicationUI::detailNews(QString news_Id)
  {
      qDebug() << "Detail News Get" << news_Id;
  }
  

  /** * Prepared by :- Umang Shah * **/#include "NewListItem.hpp"
  
  #include #include #include #include #include #include #include #include 
  
  using namespace bb::cascades;
  
  NewListItem::NewListItem(ListView * listView) : CustomControl(0){ this->listView = listView; QmlDocument *qml = QmlDocument::create("asset:///CustomRowNewsList.qml").parent(this); root = qml->createRootObject(); m_newsName = root->findChild("lblTitleText"); m_imageView = root->findChild("imageView"); m_Description = root->findChild("lblDescription"); btnContinue = root->findChild("btnContinue"); m_daysCount = root->findChild("lblDaysCount"); m_likeCount = root->findChild("lblLikeCount");
  
   connect(btnContinue, SIGNAL(clicked()), this, SLOT(onClickedHandlerRedeem()));
  
   //Network Manager for Image m_networkAccessManagerForImage = new QNetworkAccessManager(this);
  
   setRoot(root);}
  
  NewListItem::~NewListItem() { delete m_networkAccessManagerForImage;}
  
  void NewListItem::updateItem(QVariantList indexPath, const QString news_Id, const QString news_Name, const QString news_Image, const QString news_Description, const QString daysCount, const QString likesCount){ this->indexPath = indexPath; m_newsName->setText(news_Name); //html Text QTextDocument text; text.setHtml(news_Description); QString planText = text.toPlainText(); m_Description->setText("" + planText + "");
  
   m_daysCount->setText(daysCount); m_likeCount->setText("Likes(" + likesCount + ")"); QNetworkRequest request = QNetworkRequest(); request.setUrl(QUrl(news_Image)); request.setRawHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; Win 9x 4.90)"); delete m_networkAccessManagerForImage; m_networkAccessManagerForImage = new QNetworkAccessManager(this); connect(m_networkAccessManagerForImage, SIGNAL(finished(QNetworkReply*)), this, SLOT(imageNetworkReply(QNetworkReply*))); m_networkAccessManagerForImage->get(request);
  
  }
  
  void NewListItem::select(bool /*p_select*/){ // When an item is selected, show the colored highlight Container /*if (select) { mContainer->setOpacity(0.9f); } else { mContainer->setOpacity(0.0f);*/}
  
  void NewListItem::reset(bool p_selected, bool p_activated){ Q_UNUSED(p_activated);
  
   // Since items are recycled, the reset function is where we have // to make sure that item state (defined by the arguments) is correct. select(p_selected);}
  
  void NewListItem::activate(bool p_activate){ // There is no special activate state; selected and activated look the same. select(p_activate);}
  
  void NewListItem::imageNetworkReply(QNetworkReply* p_reply){
  
   if (p_reply->error() == QNetworkReply::NoError) { int red = p_reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt(); if (red >= 200 && red < 300) { // Success QByteArray qbyte = p_reply->readAll(); Image *i = new Image(qbyte); m_imageView->setImage(*i); m_imageView->setScalingMethod(ScalingMethod::Fill); m_imageView->setPreferredHeight(243); m_imageView->setPreferredWidth(500);
  
   } }
  
   p_reply->deleteLater();}
  
  void NewListItem::onClickedHandlerRedeem(){ QVariantMap dataMap = listView->dataModel()->data(indexPath).toMap(); QString newsId = dataMap["id"].toString(); QMetaObject::invokeMethod(listView, "detailNews", Q_ARG(QVariant, newsId));}
  

  It also seems that you have an incorrect class here.  You are detailNews method is in your ApplicationUI class, but you are trying to call on the ListView, not your ApplicationUI object.

  I recommend having a read through our documentation of signals and Slots , which should help you to achieve what you're trying to do.

• Nasty problem with resizing a list and a class custom CellRenderer

  Create a list (_myList) in a class with a custom CellRenderer class. In the custom CellRenderer class, I draw a rectangle with a gradient in the data() function:

  override public function set data (value:Object) : void
  {
      super.data = value;
  
      var tab_color:Array = this.data.rowColor;
      ...
      _matrix.createGradientBox(this.width, this.height, 90/180*Math.PI);
  
      with (_sprTab.graphics)
      {
          clear();
          beginGradientFill(GradientType.LINEAR, [tab_color[0], tab_color[1], tab_color[2]], [alpha,alpha,alpha], [0,127,255], _matrix);
          drawRoundRectComplex(0, 0, this.width, this.height, 15, 0, 15, 0);
          endFill();
      }
      ...
  }
  

  When policy changes I want to resize the list. Therefore, in a function in the class in which the list is created, I resize the list:

  public function setListSize (w:Number, h:Number) : void
  {
      _myList.setSize(w, h);
  }
  

  And this function is called with the new dimensions on the change of orientation in the main class.

  However, this.width in the custom CellRenderer class does not get the new width of list a reason any.

  No idea why?

  You must refresh the visible items in the list. You can loop through the list and replaceItem (...) of the call and who should do it. You can check that it would work by scrolling through the list of invisible items and they should have picked up the new width.

• State assets ListItemListener behavior

  I had problems tracking the active status of an item in my list, to keep highlighted.

  In fact, when the user clicks on the element, it is activated after a short period, then when the user slides his finger from the element to over the ActionSet who appeared, the signals of ListItem enable with the parameter 'activate' set to false, and my list item is not (because I put it no, since it is the only signal I can listen to determine its is no longer be pressed).

  However, I saw in the documentation it should probably not the case:

  A list item is "active" while a user is actively pressing the list item or when the item is target for a context menu operation. Once released, or when no longer a context menu target, the item is no longer active. With a StandardListItem, the active visual will have a outline around the item border.
  

  documentation "ListItemListener".

  Activate with 'false' when the user runs the attached menu present my object should not call States and should be inactive when the user is the navigation menu, and releases their finger (which is the behavior I want).

  I have a suspicion that the cause of this is because I you join the ActionSet ListItemListener class itself, but to the ListView. Can someone confirm that it is why it's more treated as active, because the ListView has the ActionSet attached, not the ListItemListener?

  I really don't want to rewrite the code to the ActionSet and move it to a new place, if I do not, but if it will solve this problem, it is well worth.

  I attach ActionSet point in ListItemProvider updateItem() and connect actions to the slots of the element.

  Following is a work of one of my projects. I hope that helps:

  void MovableMenuListItemProvider::updateItem(ListView* list, VisualNode *listItem, const QString &type,
                  const QVariantList &indexPath, const QVariant &data)
  {
      Q_UNUSED(list);
      Q_UNUSED(type);
      Q_UNUSED(indexPath);
  
      MenuDataItem *menuData = data.value();
      MovableMenuListItem *item = static_cast(listItem);
  
      item->setTitle(menuData->getTitle());
      item->setDescription(menuData->getDescription());
      QString image = menuData->getImageSource();
      if (!image.isEmpty())
          item->setImageSource(image);
      else
          item->resetImageSource();    item->removeAllActionSets();
      int childCount = list->dataModel()->childCount(QVariantList());
      //qDebug() << "childCount=" << childCount << ", index=" << indexPath.front().toInt() << "\n";
      item->setDataModel(qobject_cast(list->dataModel()));
      item->setIndexPath(indexPath);
      item->addActionSet(ActionSet::create()
          .title(menuData->getTitle())
          .subtitle("Please choose an action")
          .add(ActionItem::create()
               .imageSource(QUrl("assets/images/icons/upArrowIcon.png"))
               .onTriggered(item, SLOT(moveUp()))
               .enabled(!indexPath.isEmpty() && indexPath.front().toInt() > 0)
               .title("Move Up"))
          .add(ActionItem::create()
               .imageSource(QUrl("assets/images/icons/downArrowIcon.png"))
               .onTriggered(item, SLOT(moveDown()))
               .enabled(!indexPath.isEmpty() && indexPath.front().toInt() < childCount-1)
               .title("Move Down"))
          .add(DeleteActionItem::create()
               .onTriggered(item, SLOT(removeFromFavorites()))
               .title("Remove as Favorite"))
      );
  }
  

• Update of GroupDataModel list item for the lazy loading

  I have a ListView of StandardListCompoenet that is created with a GroupDataModel in C++.

  Mail, click on a button, I have to change the text content of a row in the ListView based on the number of line typed by the user in a text box.

  Goes according to the GroupDataModel API - updateItem(indexPath,QVariantMap), it can be done, I am able to build to get the row.

  There is a ListView (QVariantList) trigger method - which refers to the row of the item selected by the user.

  Since, in my code, I don't have the numero_index of the line of the user, is there a way I can build the "row" to "updateItem" of my code itself.

  Or should there be any other strategy that should be chosen instead?

  Found the solution,

  the key is to start finding the QVariantList (s) of the dataModel-> first()

  and then to reach the destination by comparing the values of data.

  Then, it would take to build a data path it would be identical to that received by trigger (QVariantList)

• Custom list item changes when you click

  I'm having a strange problem.

  When my list of messages is filled first, she checks a property in the json data to see if the message is 'read' or 'unread '. If it is "no read", it will be a different color than those who are already "read" to indicate to the user.

  It works very well, however I added an action context to the list, and when this action is triggered, I'm changing the message "unread". If the color of the list item to change. This works.

  However, after I changed the color of a single item in the listwhen I do scroll down and down, many elements change color. I think it has to do with the rendering of the list of recycling.

  This behavior does not occur after that list first initializes. Regardless of the colors have been queued to initialize their place. Only after that I have an amendment to one of the elements in the list, things go crazy when I scroll. I hope I'm being clear.

  How can I stop this from happening?  This is the code that changes the color of the label in my custom list item.

   listItemComponents: [
                              ListItemComponent {
                                  MessageListItem {
                                      id: messagesListItem
                                      contextActions: ActionSet {
                                          ActionItem {
                                              title: "Mark Unread"
                                              onTriggered: {
                                                  if (messagesListItem.isNew == false) {
                                                      var selectedItem = ListItemData;
                                                      messagesListItem.isNew = true; //property of list item is changed to unread
                                                  }
                                              }
                                          }
                                      }
  

  And inside the MessageListItem.qml

  property bool isNew: ListItemData.data.new
  
     onIsNewChanged: {
          if (isNew == true) {
              subjectLabel.textStyle.color = Color.create("#FF4500");
          } else {
              subjectLabel.textStyle.color = Color.create("#000000");
          }
      }
  

  Please let me know if you have any questions, any help or suggestion is appreciated. Thank you!

  Hello!

  I think that it doesn't because you are not changing 'new' dataModel element variable. In addition, assigning directly control isNew breaks property DataModel is bound to it.

  It should work if you change the dataModel instead.

  An important point to note, however, that it is not possible to change the individual variables of dataModel point. You need to replace the entire item. The code example for GroupDataModel: (not tested, so may require tweaks, tell me please if you need help in getting this work):

  onTriggered: {
    var selectedItem = ListItemData  // get a copy of dataModel's item
    selectedItem.new = !selectedItem.new  // modify it's property
    messagesListItem.ListItem.view.dataModel.updateItem(indexPath, selectedItem) // update the model
  }
  

  For ArrayDataModel, the function is named differently.

  In addition, this line seems suspicious:

  property bool isNew: ListItemData.data.new
  

  Probably, it should be replaced by this one:

  property bool isNew: ListItemData.new
  

• What signal is emitted in the ListView, when one of its cells appears in or from the screen turns off?

  What signal is emitted in the ListView, when one of its cells appears in or from the screen turns off?

  I created listView with custom listItemComponents

  Is there any signal when listItemComponent go to the screen?

  Currently, it is not possible to detect if the cells turns off the screen. Even if you join LayoutUpdateHandler them they will just stop send updates when you go off the screen. I managed to hack a solution using a timer, but I guess that a cleaner approach would more use a ScrollView with CustomControls instead:

  1. get the dimensions of the ScrollView joining ScrollView LayoutUpdateHandler.

  2. attach the LayoutUpdateHandlers to the CustomControls.

  UPD: It is also viewableArea & viewableAreaChanged event scrollView property.

  3. If the controls that were inside the visible area of the ScrollView went outside, raises the event.

  Of course re-use of cell works that way.

  It's so easy to grab the cell on the screen:

  If you use ListItemProvider, updateItem() function is called when the element appears on the screen:

  https://developer.BlackBerry.com/Cascades/reference/bb__cascades__listitemprovider.html

  It will also be called if the data item are updated in the model.

  When the item is created for the first time, createItem() is called.

• Loop on the life list

  How can I loop over alistview I have?

  and make a difference in this asyncrhonusly. like here, I want to access the imageview to set the image once that I get them from a certain url.

    ListView {
              layout: StackListLayout {
                  orientation: LayoutOrientation.LeftToRight
              }
              flickMode: FlickMode.SingleItem
              objectName: "customList"
              id: customList
              listItemComponents: [
  
                  ListItemComponent {
  
                     Container {
                         preferredWidth: ListItemData.width
                         Container {
                             background: Color.create("#52c1b1")
                             layout: StackLayout {
  
                             }
                             layoutProperties: StackLayoutProperties {
                                 spaceQuota: 1
                             }
                             horizontalAlignment: HorizontalAlignment.Fill
                             Label {
                                 text:  ListItemData.fieldName
                                 topMargin: 15
                                 horizontalAlignment: HorizontalAlignment.Center
                                 textStyle.color: Color.White
                             }
                             ImageView {
                                 bottomMargin: 15
                                 id: imageFlyer
                                 objectName: "imageFlyer"
                                 horizontalAlignment: HorizontalAlignment.Center
                                 scalingMethod: ScalingMethod.AspectFit
                             }
                         }
                         Container {
                             layout: StackLayout {
  
                             }
                             layoutProperties: StackLayoutProperties {
                                 spaceQuota: 1
                             }
                         }
  
                     }
                  }
              ]
          }
  

  Hi babakar,.

  It depends on the type of the DataModel associated with your ListView. To update an element in a GroupdDataModel for example, you call a function updateItem .

• Unable to restore the ImageView ListComponent - image of the data folder

  I downloaded an image in the folder data and want to show it in the listView.

  In Listcomponent, I use an ImageView

  "If I put its imagesource:".. /.. /.. "/ data/files/images/123.png".

  The image appears correctly.

  But if I try to put the same path of C++ code in the GroupDataModel, the image doesn't make.

  Hi friends,

  I found the solution. I hope that is useful you.

  . HPP

   

  #include 
  #include 
  #include 
  
  using namespace bb::cascades;
  
  class App: public QObject {
  Q_OBJECT
  
  public:
      App();
  
  public slots:
      void onSelectionChanged(const QVariantList indexPath, bool selected);
  
  private:
      ListView *listView;
  
  };
  

  . CPP

  #include "app.hpp"
  
  #include 
  #include 
  
  #include 
  
  #include 
  #include 
  #include 
  #include 
  #include 
  
  using namespace bb::cascades;
  
  App::App() {
      QmlDocument *qml = QmlDocument::create("main.qml");
      AbstractPane *root = qml->createRootNode();
  
      GroupDataModel *model = new GroupDataModel(
              QStringList() << "firstname" << "surname" << "imagepath");
      model->setGrouping(ItemGrouping::ByFirstChar);
  
      listView = root->findChild("listView");
  
      QVariantMap person;
      person["firstname"] = "John";
      person["surname"] = "Mark";
      person["imagepath"] = "I will set on click.";
      model->insert(person);
      person["firstname"] = "Mark";
      person["surname"] = "Russie";
      person["imagepath"] = "asset:///icon.png";
      model->insert(person);
  
      listView->setDataModel(model);
  
      QObject::connect(listView,
              SIGNAL(selectionChanged(const QVariantList, bool)), this,
              SLOT(onSelectionChanged(const QVariantList, bool)));
  
      Application::setScene(root);
  }
  
  void App::onSelectionChanged(const QVariantList indexPath, bool selected) {    if (selected) {        if (sender()) {            GroupDataModel *stampModel =                    (GroupDataModel *) listView->dataModel();            QVariantMap map = stampModel->data(indexPath).toMap();            //map["imagepath"] = "asset:///icon.png";            map["imagepath"] = "../../../data/icon.png";            stampModel->updateItem(indexPath, map);            fprintf(stderr, "\nSelection Called");        }    }}
  

  . QML
  

   

  import bb.cascades 1.0
  
  Page {
      content: Container {
          ListView {
              objectName: "listView"
              listItemComponents: [
                  ListItemComponent {
                      type: "header"
                      HeaderListItem {
                          title: ListItemData
                      }
                  },
                  ListItemComponent {
                      type: "item"
                      StandardListItem {
                          id: root
                          title: ListItemData.firstname
                          description: ListItemData.surname
                          imageSource: ListItemData.imagepath
                      }
                  }
              ]
          }
      }
  }
  

  Currently, I put a static image and a rest black. It will have the value during the click on list black image (dynamically).

• Using a single XML tag for ListView

  Hi all

  I try to fill my ListView with a series of specific tags from my XML file. For example, using this XML file:

  For what it's worth, this is how I solved this:

  1. Add a class ListItemProvider based in your project:

  class ViewerListItemManager: public bb::cascades::ListItemProvider
  {
  public:
      ViewerListItemManager();
  
      VisualNode * createItem(ListView* list, const QString &type);
  
      void updateItem(ListView* list, bb::cascades::VisualNode *listItem,
              const QString &type, const QVariantList &indexPath, const QVariant &data);
  };
  

  2. implementation of the new class:

  ViewerListItemManager::ViewerListItemManager()
  {
  }
  
  VisualNode * ViewerListItemManager::createItem(ListView* list, const QString &type)
  {
      Q_UNUSED(list);
  
      if (type.compare(GroupDataModel::Header) == 0) {
          return new Header();
      } else {
          return new StandardListItem();
      }
  }
  
  void ViewerListItemManager::updateItem(ListView* list, bb::cascades::VisualNode *listItem,
          const QString &type, const QVariantList &indexPath, const QVariant &data)
  {
      Q_UNUSED(list);
      Q_UNUSED(indexPath);
  
      if (type.compare(GroupDataModel::Header) == 0) {
          QString caption = data.value();
          static_cast(listItem)->setTitle(caption);
      } else {
          QVariantMap map = data.value();
          static_cast(listItem)->setTitle(QString("%1").arg(map["firstname"].toString()));
      }
  }
  

  3 assign the ListItemProvider to your list:

  groupDatamodel = new GroupDataModel();
  XmlDataAccess xda;
  QVariant list = xda.load(QDir::currentPath()+"/data/employees.xml", "/root/employee");
  
  groupDatamodel->insertList(list.value());
  listView = new ListView();
  ViewerListItemManager *viewerItemProvider = new ViewerListItemManager();
  listView->setListItemProvider(viewerItemProvider);
  listView->setDataModel(groupDatamodel);
  

• Error with ListItemProvider - undefined reference to build

  I'm tying to add a ListItemProvider for my project, but without success.

  If I add the following class extends from ListItemProvider to my project, it fails to build - this from the log from the console:

  "o-g/.obj/TripListItemProvider.o.rodata._ZTV20TripListItemProvider [_ZTV20TripListItemProvider](+0x3c): refers to 'TripListItemProvider::updateItem(bb::cascades::ListView*, bb::cascades::VisualNode*, QString const&, QList const&, QVariant const&)' the undefined".

  I tried recreating it from scratch and comment on different things.  I can build OK, if I comment out the function updateItem call, but that's really what I want to use, that kind of defeats the purpose of the ListitemProvider.

  I tried to recreate a number of times and also different levels of SDK.  If I drop the class in a sample as Battambang, island generation fails in a similar way.  But if I have him drop it into C++ Cookbook sample, it compiles OK.  I compared to the building, in particular the included libraries and can not see the difference.  I don't know there is a, only I don't know where to look.

  Any help gratefully received.

  TIA.

  /*
   * TripListItemProvider.cpp
   *
   */
  
  #include "TripListItemProvider.h"
  
  using namespace bb::cascades;
  
  TripListItemProvider::TripListItemProvider() {
      // TODO Auto-generated constructor stub
  
  }
  
  TripListItemProvider::~TripListItemProvider() {
      // TODO Auto-generated destructor stub
  }
  
  bb::cascades::VisualNode * TripListItemProvider::createItem(ListView* list, const QString &type) {
      return NULL;
  }
  
  void updateItem(ListView* list, VisualNode *listItem, const QString &type, const QVariantList &indexPath, const QVariant &data) {
  }
  

  /*
   * TripListItemProvider.h
   *
   */
  
  #ifndef TRIPLISTITEMPROVIDER_H_
  #define TRIPLISTITEMPROVIDER_H_
  
  #include 
  // #include 
  // #include 
  // #include 
  // #include 
  
  using namespace bb::cascades;
  
  class TripListItemProvider: public ListItemProvider {
  public:
      TripListItemProvider();
      virtual ~TripListItemProvider();
  
      bb::cascades::VisualNode * createItem(bb::cascades::ListView* list, const QString &type);
      void updateItem(ListView* list, VisualNode *listItem, const QString &type, const QVariantList &indexPath, const QVariant &data);
  
  };
  
  #endif /* TRIPLISTITEMPROVIDER_H_ */
  

  Hey there...

  My guess would be

  /*
   * TripListItemProvider.cpp
   *
   */
  
  void TripListItemProvider::updateItem(ListView* list, VisualNode *listItem, const QString &type, const QVariantList &indexPath, const QVariant &data) {
  }