Bagaimana cara menambahkan tab ke tab secara dinamis?

Saya mencoba menambahkan tab baru ke komponen tab dengan kode di bawah ini.

Saat menjalankan tidak ada kesalahan yang dilaporkan tetapi tidak ada tab tambahan yang ditampilkan. Saya telah mencoba menggunakan tab dan tab .__ tabsModel sebagai induk tetapi tidak ada tab tambahan yang ditampilkan.

import QtQuick 2.0
import QtQuick.LocalStorage 2.0
import Ubuntu.Components 0.1

MainView {
    // objectName for functional testing purposes (autopilot-qt5)
    id: mainView
    objectName: "mainView"
    applicationName: "news-feed"

    width: units.gu(100)
    height: units.gu(75)

    Tabs {
        id: tabs
        anchors.fill: parent

        Component.onCompleted: {
            mainView.initializeDB();
            mainView.saveFeed("BBC News","http://feeds.bbci.co.uk/news/rss.xml");
            mainView.saveFeed("Jono Bacon","http://www.jonobacon.org/?feed=rss2");
            mainView.saveFeed("The Register", "http://www.theregister.co.uk/headlines.atom");
            fillTabs();
        }

        tools: ToolbarActions {
            Action {
                objectName: "action"

                iconSource: Qt.resolvedUrl("avatar.png")
                text: i18n.tr("Tap me!")

                onTriggered: {
                    label.text = i18n.tr("Toolbar tapped")
                }
            }
        }

        // First tab begins here
        Tab {
            id: tabFrontPage
            objectName: "tabFrontPage"

            title: i18n.tr("Front Page")

            // Tab content begins here
            page: Page {
                Column {
                    anchors.centerIn: parent
                    Label {
                        id: labelFrontPage
                        text: i18n.tr("This will be the front page \n An aggregation of the top stories from each feed")
                    }
                }
            }
        }
    }

    function fillTabs() {
        var db = getDatabase();
        db.transaction(function(tx) {
            var rs = tx.executeSql('SELECT * FROM feeds;');
            if (rs.rows.length > 0) {
                for(var i = 0; i < rs.rows.length; i++) {
                    var feedTab = Qt.createQmlObject('import QtQuick 2.0;import Ubuntu.Components 0.1;Tab {anchors.fill: parent;objectName: "Tab";title: i18n.tr("Tab");page: Page {anchors.margins: units.gu(2);Column {anchors.centerIn: parent;Label {id: label;objectName: "label";text: i18n.tr("Tab");}}}}',tabs,"feedTab");
                }
            } else {
                res = "Unknown";
            }
        })
    }
    //Storage API
    function getDatabase() {
        return LocalStorage.openDatabaseSync("news-feed","1.0","StorageDatabase",10000)
    }

    //Initialise DB tables if not already existing
    function initializeDB() {
        var db = getDatabase();
        db.transaction(function(tx) {
            //Create settings table if not existing
            tx.executeSql('CREATE TABLE IF NOT EXISTS settings(setting TEXT UNIQUE, value TEXT)');
            tx.executeSql('CREATE TABLE IF NOT EXISTS feeds(feedName TEXT UNIQUE, feedURL TEXT UNIQUE)')
        });
    }

    //Write setting to DB
    function setSetting(setting,value){
        //setting: string - setting name (key)
        //value: string - value
        var db = getDatabase();
        var res = "";
        db.transaction(function(tx) {
            var rs = tx.executeSql('INSERT OR REPLACE INTO settings VALUES (?,?);',[setting,value]);
            //console.log(rs.rowsAffected)
            if(rs.rowsAffected > 0) {
                res = "OK";
            } else {
                res = "Error";
            }
        })
        return res;
    }

    //Read setting from DB
    function getSetting(setting) {
        var db = getDatabase();
        var res="";
        db.transaction(function(tx) {
            var rs = tx.executeSql('SELECT value FROM settings WHERE setting=?;', [setting]);
            if (rs.rows.length > 0) {
                res = rs.rows.item(0).value;
            } else {
                res = "Unknown";
            }
        })
        return res;
    }

    function saveFeed(feedName, feedURL) {
        var db = getDatabase();
        var res = "";
        db.transaction(function(tx){
            var rs = tx.executeSql('INSERT OR REPLACE INTO feeds VALUES (?,?)',[feedName,feedURL]);
            //console.log(rs.rowsAffected)
            if (rs.rowsAffected > 0) {
                res = "OK";
            } else {
                res = "Error";
            }
        })
        return res;
    }

    //Return a single feed
    function getFeed(feedName) {
        var db = getDatabase();
        var res = "";
        db.transaction(function(tx) {
            var rs = tx.executeSql('SELECT feedURL FROM feeds WHERE feedName=?;', [feedName]);
            if (rs.rows.length > 0) {
                res = rs.rows.item(0).feedURL;
            } else {
                res = "Unknown";
            }

        })
        return res;
    }

    //Return all feeds and urls
    function getFeeds() {
        var db = getDatabase();
        var res = "";
        db.transaction(function(tx) {
            var rs = tx.executeSql('SELECT * FROM feeds;');
            if (rs.rows.length > 0) {
                return rs;
            } else {
                res = "Unknown";
            }
        })
        return res;
    }
}

Saya takut menambahkan tab secara dinamis saat ini tidak memungkinkan

Tim SDK memberi tahu saya bahwa ini adalah batasan dari tipe VisualItemModel (yang digunakan komponen Tab ), karena tidak memungkinkan penambahan anak secara dinamis.

Ada bug terbuka untuk melacak masalah ini .

Berikut adalah contoh penyelesaiannya.

Metode ini menghasilkan hampir semua gui yang ditentukan dalam string dan menjadi berantakan dengan cepat tetapi akan bekerja sampai fitur untuk menambahkan VisualItemModel diimplementasikan di hulu.

Ini adalah awal dari rss reader yang sedang saya mainkan. Jika Anda menempelkannya ke file qml kosong itu harus berjalan dengan baik. (Anda mungkin perlu menginstal libqt5sql5-sqlite dan qtdeclarative5-localstorage-plugin. Mereka ada di gambar ponsel tetapi tidak diinstal dengan SDK install).

import QtQuick 2.0
import QtQuick.LocalStorage 2.0
import Ubuntu.Components 0.1

/*!
    \brief MainView with Tabs element.
       First Tab has a single Label and
       second Tab has a single ToolbarAction.
*/

MainView {
    // objectName for functional testing purposes (autopilot-qt5)
    id: mainView
    objectName: "mainView"
    applicationName: "news-feed"

    width: units.gu(100)
    height: units.gu(75)

    tools: ToolbarActions {
    Action {
        objectName: "action"

        iconSource: Qt.resolvedUrl("avatar.png")
        text: i18n.tr("Tap me!")

        onTriggered: {
            label.text = i18n.tr("Toolbar tapped")
        }
    }
    }

    Component.onCompleted: {
    mainView.initializeDB();
    mainView.saveFeed("BBC News","http://feeds.bbci.co.uk/news/rss.xml");
    mainView.saveFeed("Jono Bacon","http://www.jonobacon.org/?feed=rss2");
    mainView.saveFeed("The Register", "http://www.theregister.co.uk/headlines.atom");
    fillTabs();
    }

    Tabs {
    id: initialtabs
    anchors.fill: parent

    tools: ToolbarActions {
        Action {
            objectName: "action"

            iconSource: Qt.resolvedUrl("avatar.png")
            text: i18n.tr("Tap me!")

            onTriggered: {
                label.text = i18n.tr("Toolbar tapped")
            }
        }
    }

    // First tab begins here
    Tab {
        id: tabFrontPage
        objectName: "tabFrontPage"

        title: i18n.tr("Front Page")

        // Tab content begins here
        page: Page {
            Column {
                anchors.centerIn: parent
                Label {
                    id: labelFrontPage
                    text: i18n.tr("This will be the front page \n An aggregation of the top stories from each feed")
                }
            }
        }
    }
    }


    function fillTabs() {
    initialtabs.destroy();
    var objStr = "import QtQuick 2.0;import Ubuntu.Components 0.1;import QtQuick.XmlListModel 2.0;Tabs{id:tabs;anchors.fill:parent;"
    var db = getDatabase();
    db.transaction(function(tx) {
        var rs = tx.executeSql('SELECT * FROM feeds;');
        if (rs.rows.length > 0) {
            for(var i = 0; i < rs.rows.length; i++) {
                objStr += "Tab {id:tab" + i + ";anchors.fill:parent;title:'" + rs.rows.item(i).feedName + "';property string source: '" + rs.rows.item(i).feedURL + "';page: Page {anchors.margins: units.gu(2);Column {anchors.centerIn: parent;Label{text:tab" + i + ".source;}}}}";
            }
            objStr += "}";
            var cmpTabs = Qt.createQmlObject(objStr,mainView,"tabsfile");
        } else {
            res = "Unknown";
        }
    })
    }

    //Create tabs for each feed
    function createTabs() {
    var feeds = getFeeds();
    for (var i = 0; i < feeds.length; i++){
        //Add tab for each feed.
        //Cannot be done with existing API

    }
    }

    //Storage API
    function getDatabase() {

    return LocalStorage.openDatabaseSync("news-feed","1.0","StorageDatabase",10000)
    }

    //Initialise DB tables if not already existing
    function initializeDB() {
    var db = getDatabase();
    db.transaction(function(tx) {
        //Create settings table if not existing
        tx.executeSql('CREATE TABLE IF NOT EXISTS settings(setting TEXT UNIQUE, value TEXT)');
        tx.executeSql('CREATE TABLE IF NOT EXISTS feeds(feedName TEXT UNIQUE, feedURL TEXT UNIQUE)')
    });
    }

    //Write setting to DB
    function setSetting(setting,value){
    //setting: string - setting name (key)
    //value: string - value
    var db = getDatabase();
    var res = "";
    db.transaction(function(tx) {
        var rs = tx.executeSql('INSERT OR REPLACE INTO settings VALUES (?,?);',[setting,value]);
        //console.log(rs.rowsAffected)
        if(rs.rowsAffected > 0) {
            res = "OK";
        } else {
            res = "Error";
        }
    })
    return res;
    }

    //Read setting from DB
    function getSetting(setting) {
       var db = getDatabase();
       var res="";
       db.transaction(function(tx) {
     var rs = tx.executeSql('SELECT value FROM settings WHERE setting=?;', [setting]);
     if (rs.rows.length > 0) {
          res = rs.rows.item(0).value;
     } else {
         res = "Unknown";
     }
      })
      // The function returns “Unknown” if the setting was not found in the database
      // For more advanced projects, this should probably be handled through error codes
      return res;
    }

    function saveFeed(feedName, feedURL) {
    var db = getDatabase();
    var res = "";
    db.transaction(function(tx){
        var rs = tx.executeSql('INSERT OR REPLACE INTO feeds VALUES (?,?)',[feedName,feedURL]);
        //console.log(rs.rowsAffected)
        if (rs.rowsAffected > 0) {
            res = "OK";
        } else {
            res = "Error";
        }
    })
    return res;
    }

    //Return a single feed
    function getFeed(feedName) {
    var db = getDatabase();
    var res = "";
    db.transaction(function(tx) {
        var rs = tx.executeSql('SELECT feedURL FROM feeds WHERE feedName=?;', [feedName]);
        if (rs.rows.length > 0) {
            res = rs.rows.item(0).feedURL;
        } else {
            res = "Unknown";
        }

    })
    return res;
    }

    //Return all feeds and urls
    function getFeeds() {
    var db = getDatabase();
    var res = "";
    db.transaction(function(tx) {
        var rs = tx.executeSql('SELECT * FROM feeds;');
        if (rs.rows.length > 0) {
            return rs;
        } else {
            res = "Unknown";
        }
        })
    return res;
    }
}