Merge remote-tracking branch 'origin/5.6' into 5.7

Conflicts:
	tests/auto/qquicktreemodeladaptor/tst_qquicktreemodeladaptor.cpp

Change-Id: I0b6018fdac65a5385136e4c3561fba1c52ecd32e

16 files changed, 261 insertions, 14 deletions

diff --git a/examples/quickcontrols/controls/texteditor/src/documenthandler.cpp b/examples/quickcontrols/controls/texteditor/src/documenthandler.cpp
index bdecf5ba..69da88f0 100644
--- a/examples/quickcontrols/controls/texteditor/src/documenthandler.cpp
+++ b/examples/quickcontrols/controls/texteditor/src/documenthandler.cpp
@@ -179,6 +179,9 @@ void DocumentHandler::reset()
 
 QTextCursor DocumentHandler::textCursor() const
 {
+    if (!m_doc)
+        return QTextCursor();
+
     QTextCursor cursor = QTextCursor(m_doc);
     if (m_selectionStart != m_selectionEnd) {
         cursor.setPosition(m_selectionStart);
@@ -209,6 +212,9 @@ void DocumentHandler::setSelectionEnd(int position)
 
 void DocumentHandler::setAlignment(Qt::Alignment a)
 {
+    if (!m_doc)
+        return;
+
     QTextBlockFormat fmt;
     fmt.setAlignment((Qt::Alignment) a);
     QTextCursor cursor = QTextCursor(m_doc);
diff --git a/src/controls/Private/ScrollViewHelper.qml b/src/controls/Private/ScrollViewHelper.qml
index 066bc6cd..810de91d 100644
--- a/src/controls/Private/ScrollViewHelper.qml
+++ b/src/controls/Private/ScrollViewHelper.qml
@@ -134,6 +134,11 @@ Item {
         anchors.right: cornerFill.left
         anchors.leftMargin:  leftMargin
         anchors.bottomMargin: bottomMargin
+        onScrollAmountChanged: {
+            if (flickableItem && (flickableItem.atXBeginning || flickableItem.atXEnd)) {
+                value = flickableItem.contentX - flickableItem.originX
+            }
+        }
         onValueChanged: {
             if (!blockUpdates) {
                 flickableItem.contentX = value + flickableItem.originX
@@ -183,6 +188,11 @@ Item {
         anchors.top: parent.top
         anchors.topMargin: __scrollBarTopMargin + topMargin
         anchors.rightMargin: rightMargin
+        onScrollAmountChanged: {
+            if (flickableItem && (flickableItem.atYBeginning || flickableItem.atYEnd)) {
+                value = flickableItem.contentY - flickableItem.originY
+            }
+        }
         onValueChanged: {
             if (flickableItem && !blockUpdates && enabled) {
                 flickableItem.contentY = value + flickableItem.originY
diff --git a/src/controls/Private/TreeViewItemDelegateLoader.qml b/src/controls/Private/TreeViewItemDelegateLoader.qml
index 4f8b26f6..e19215ed 100644
--- a/src/controls/Private/TreeViewItemDelegateLoader.qml
+++ b/src/controls/Private/TreeViewItemDelegateLoader.qml
@@ -81,7 +81,7 @@ TableViewItemDelegateLoader {
         readonly property color textColor: __rowItem ? __rowItem.itemTextColor : "black"
         readonly property string role: __column ? __column.role : ""
         readonly property var value: model && model.hasOwnProperty(role) ? model[role] : ""
-        readonly property var index: __treeModel.mapRowToModelIndex(row)
+        readonly property var index: model ? model["_q_TreeView_ModelIndex"] : __treeModel.index(-1,-1,null)
         readonly property int depth: model && column === 0 ? model["_q_TreeView_ItemDepth"] : 0
         readonly property bool hasChildren: model ? model["_q_TreeView_HasChildren"] : false
         readonly property bool hasSibling: model ? model["_q_TreeView_HasSibling"] : false
diff --git a/src/controls/Private/qquickstyleitem.cpp b/src/controls/Private/qquickstyleitem.cpp
index 4f6aec08..95722f93 100644
--- a/src/controls/Private/qquickstyleitem.cpp
+++ b/src/controls/Private/qquickstyleitem.cpp
@@ -70,7 +70,7 @@ static inline HIRect qt_hirectForQRect(const QRect &convertRect, const QRect &re
     returned if it can't be obtained. It is the caller's responsibility to
     CGContextRelease the context when finished using it.
 
-    \warning This function is only available on Mac OS X.
+    \warning This function is only available on \macos.
     \warning This function is duplicated in qmacstyle_mac.mm
 */
 CGContextRef qt_mac_cg_context(const QPaintDevice *pdev)
diff --git a/src/controls/Private/qquicktreemodeladaptor.cpp b/src/controls/Private/qquicktreemodeladaptor.cpp
index 9c0dd71c..26db62a3 100644
--- a/src/controls/Private/qquicktreemodeladaptor.cpp
+++ b/src/controls/Private/qquicktreemodeladaptor.cpp
@@ -156,6 +156,7 @@ QHash<int, QByteArray> QQuickTreeModelAdaptor1::roleNames() const
     modelRoleNames.insert(ExpandedRole, "_q_TreeView_ItemExpanded");
     modelRoleNames.insert(HasChildrenRole, "_q_TreeView_HasChildren");
     modelRoleNames.insert(HasSiblingRole, "_q_TreeView_HasSibling");
+    modelRoleNames.insert(ModelIndexRole, "_q_TreeView_ModelIndex");
     return modelRoleNames;
 }
 
@@ -180,6 +181,8 @@ QVariant QQuickTreeModelAdaptor1::data(const QModelIndex &index, int role) const
         return !(modelIndex.flags() & Qt::ItemNeverHasChildren) && m_model->hasChildren(modelIndex);
     case HasSiblingRole:
         return modelIndex.row() != m_model->rowCount(modelIndex.parent()) - 1;
+    case ModelIndexRole:
+        return modelIndex;
     default:
         return m_model->data(modelIndex, role);
     }
@@ -195,6 +198,7 @@ bool QQuickTreeModelAdaptor1::setData(const QModelIndex &index, const QVariant &
     case ExpandedRole:
     case HasChildrenRole:
     case HasSiblingRole:
+    case ModelIndexRole:
         return false;
     default: {
         const QModelIndex &pmi = mapToModel(index);
@@ -719,8 +723,11 @@ void QQuickTreeModelAdaptor1::modelRowsAboutToBeMoved(const QModelIndex & source
             destIndex = itemIndex(m_model->index(destinationRow, 0, destinationParent));
         }
 
-        beginMoveRows(QModelIndex(), startIndex, endIndex, QModelIndex(), destIndex);
         int totalMovedCount = endIndex - startIndex + 1;
+
+        const bool visibleRowsMoved = startIndex != destIndex &&
+            beginMoveRows(QModelIndex(), startIndex, endIndex, QModelIndex(), destIndex);
+
         const QList<TreeItem> &buffer = m_items.mid(startIndex, totalMovedCount);
         int bufferCopyOffset;
         if (destIndex > endIndex) {
@@ -729,6 +736,7 @@ void QQuickTreeModelAdaptor1::modelRowsAboutToBeMoved(const QModelIndex & source
             }
             bufferCopyOffset = destIndex - totalMovedCount;
         } else {
+            // NOTE: we will not enter this loop if startIndex == destIndex
             for (int i = startIndex - 1; i >= destIndex; i--) {
                 m_items.swap(i, i + totalMovedCount); // Fast move from 1st to 2nd position
             }
@@ -739,14 +747,49 @@ void QQuickTreeModelAdaptor1::modelRowsAboutToBeMoved(const QModelIndex & source
             item.depth += depthDifference;
             m_items.replace(bufferCopyOffset + i, item);
         }
-        endMoveRows();
+
+        if (visibleRowsMoved)
+            endMoveRows();
+
+        if (depthDifference != 0) {
+            const QModelIndex &topLeft = index(bufferCopyOffset, 0, QModelIndex());
+            const QModelIndex &bottomRight = index(bufferCopyOffset + totalMovedCount - 1, 0, QModelIndex());
+            const QVector<int> changedRole(1, DepthRole);
+            emit dataChanged(topLeft, bottomRight, changedRole);
+        }
     }
 }
 
 void QQuickTreeModelAdaptor1::modelRowsMoved(const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationRow)
 {
-    if (!childrenVisible(sourceParent) && childrenVisible(destinationParent))
-        modelRowsInserted(destinationParent, destinationRow, destinationRow + sourceEnd - sourceStart);
+    if (childrenVisible(destinationParent)) {
+        if (!childrenVisible(sourceParent))
+            modelRowsInserted(destinationParent, destinationRow, destinationRow + sourceEnd - sourceStart);
+        else {
+            int destIndex = -1;
+            if (destinationRow == m_model->rowCount(destinationParent)) {
+                const QModelIndex &emi = m_model->index(destinationRow - 1, 0, destinationParent);
+                destIndex = lastChildIndex(emi) + 1;
+            } else {
+                destIndex = itemIndex(m_model->index(destinationRow, 0, destinationParent));
+            }
+
+            const QModelIndex &emi = m_model->index(destinationRow + sourceEnd - sourceStart, 0, destinationParent);
+            int endIndex = -1;
+            if (isExpanded(emi)) {
+                int rowCount = m_model->rowCount(emi);
+                if (rowCount > 0)
+                    endIndex = lastChildIndex(m_model->index(rowCount - 1, 0, emi));
+            }
+            if (endIndex == -1)
+                endIndex = itemIndex(emi);
+
+            const QModelIndex &topLeft = index(destIndex, 0, QModelIndex());
+            const QModelIndex &bottomRight = index(endIndex, 0, QModelIndex());
+            const QVector<int> changedRole(1, ModelIndexRole);
+            emit dataChanged(topLeft, bottomRight, changedRole);
+        }
+    }
     ASSERT_CONSISTENCY();
 }
 
diff --git a/src/controls/Private/qquicktreemodeladaptor_p.h b/src/controls/Private/qquicktreemodeladaptor_p.h
index ddad96cb..e7192314 100644
--- a/src/controls/Private/qquicktreemodeladaptor_p.h
+++ b/src/controls/Private/qquicktreemodeladaptor_p.h
@@ -77,10 +77,11 @@ public:
     void resetRootIndex();
 
     enum {
-        DepthRole = Qt::UserRole - 4,
+        DepthRole = Qt::UserRole - 5,
         ExpandedRole,
         HasChildrenRole,
-        HasSiblingRole
+        HasSiblingRole,
+        ModelIndexRole
     };
 
     QHash<int, QByteArray> roleNames() const;
diff --git a/src/controls/doc/src/qtquickcontrols-examples.qdoc b/src/controls/doc/src/qtquickcontrols-examples.qdoc
index 70c8eabb..08f61e10 100644
--- a/src/controls/doc/src/qtquickcontrols-examples.qdoc
+++ b/src/controls/doc/src/qtquickcontrols-examples.qdoc
@@ -46,7 +46,7 @@
     <tr><td style="border:0px">
     \endraw
     \image qtquickcontrols-example-gallery-osx.png
-    \caption OS X
+    \caption \macos
     \raw HTML
     </td><td style="border:0px">
     \endraw
@@ -157,7 +157,7 @@
     import org.qtproject.example 1.0
     \endcode
 
-    For more information about registering C++ classses as QML types, see
+    For more information about registering C++ classes as QML types, see
     \l {Defining QML Types from C++}.
 
     \include examples-run.qdocinc
@@ -198,7 +198,7 @@
     import org.qtproject.example 1.0
     \endcode
 
-    For more information about registering C++ classses as QML types, see
+    For more information about registering C++ classes as QML types, see
     \l {Defining QML Types from C++}.
 
     \include examples-run.qdocinc
diff --git a/src/controls/doc/src/qtquickcontrols-tableview.qdoc b/src/controls/doc/src/qtquickcontrols-tableview.qdoc
index cf86174a..ba16b115 100644
--- a/src/controls/doc/src/qtquickcontrols-tableview.qdoc
+++ b/src/controls/doc/src/qtquickcontrols-tableview.qdoc
@@ -243,7 +243,7 @@
     \endcode
 
     \b Example: To iterate over selected indexes, you can pass a callback function.
-                \a rowIndex is passed as as an argument to the callback function.
+                \a rowIndex is passed as an argument to the callback function.
     \code
         tableview.selection.forEach( function(rowIndex) {console.log(rowIndex)} )
     \endcode
diff --git a/src/controls/qquickmenu.cpp b/src/controls/qquickmenu.cpp
index ddb25790..67682ad3 100644
--- a/src/controls/qquickmenu.cpp
+++ b/src/controls/qquickmenu.cpp
@@ -442,6 +442,10 @@ void QQuickMenu1::__popup(const QRectF &targetRect, int atItemIndex, MenuType me
     // parentWindow may not be a QQuickWindow (happens when using QQuickWidget)
 
     if (m_platformMenu) {
+        if (m_windowConnection)
+            QObject::disconnect(m_windowConnection);
+        m_windowConnection = connect(parentWindow, &QWindow::visibleChanged, this,
+                                     &QQuickMenu1::platformMenuWindowVisibleChanged, Qt::UniqueConnection);
         QRectF globalTargetRect = targetRect.translated(m_xOffset, m_yOffset);
         if (visualItem()) {
             if (qGuiApp->isRightToLeft()) {
@@ -571,6 +575,19 @@ void QQuickMenu1::windowVisibleChanged(bool v)
     }
 }
 
+void QQuickMenu1::platformMenuWindowVisibleChanged(bool visible)
+{
+    if (!visible) {
+        if (m_windowConnection) {
+            QObject::disconnect(m_windowConnection);
+            m_windowConnection = QMetaObject::Connection();
+        }
+        if (m_platformMenu) {
+            m_platformMenu->dismiss();
+        }
+    }
+}
+
 void QQuickMenu1::clearPopupWindow()
 {
     m_popupWindow = 0;
diff --git a/src/controls/qquickmenu_p.h b/src/controls/qquickmenu_p.h
index a8a14c5a..800981dd 100644
--- a/src/controls/qquickmenu_p.h
+++ b/src/controls/qquickmenu_p.h
@@ -168,6 +168,7 @@ protected Q_SLOTS:
 
     void updateText();
     void windowVisibleChanged(bool);
+    void platformMenuWindowVisibleChanged(bool);
 
 private:
     QQuickWindow *findParentWindow();
@@ -208,6 +209,7 @@ private:
     QFont m_font;
     int m_triggerCount;
     bool m_proxy;
+    QMetaObject::Connection m_windowConnection;
 };
 
 QT_END_NAMESPACE
diff --git a/src/controls/qquickpopupwindow.cpp b/src/controls/qquickpopupwindow.cpp
index 6d87ac47..9a6519ed 100644
--- a/src/controls/qquickpopupwindow.cpp
+++ b/src/controls/qquickpopupwindow.cpp
@@ -227,7 +227,8 @@ void QQuickPopupWindow1::hideEvent(QHideEvent *e)
 {
     if (QWindow *tp = !m_needsActivatedEvent ? transientParent() : 0) {
         m_needsActivatedEvent = true;
-        QWindowSystemInterface::handleWindowActivated(tp);
+        if (tp->isVisible())
+            QWindowSystemInterface::handleWindowActivated(tp);
     }
 
     QQuickWindow::hideEvent(e);
diff --git a/tests/auto/controls/data/tst_scrollview.qml b/tests/auto/controls/data/tst_scrollview.qml
index a9148db4..07d6525e 100644
--- a/tests/auto/controls/data/tst_scrollview.qml
+++ b/tests/auto/controls/data/tst_scrollview.qml
@@ -51,6 +51,7 @@
 import QtQuick 2.2
 import QtTest 1.0
 import QtQuick.Controls 1.2
+import QtQuick.Controls.Styles 1.1
 import QtQuickControlsTests 1.0
 
 Item {
@@ -100,6 +101,68 @@ TestCase {
         scrollView.destroy()
     }
 
+    Component {
+        id: dragFetchAppendComponent
+
+        ScrollView {
+            width: 400; height: 400
+            frameVisible: false
+            style: ScrollViewStyle {
+                transientScrollBars: false
+                handle: Rectangle {
+                    implicitWidth: 16; implicitHeight: 16
+                    color: "red"
+                }
+                scrollBarBackground: Item {width: 16 ; height: 16}
+                incrementControl: Rectangle {
+                    width: 16; height: 16
+                    color: "blue"
+                }
+                decrementControl: Rectangle {
+                    width: 16; height: 16
+                    color: "blue"
+                }
+            }
+            ListView {
+                id: view
+
+                verticalLayoutDirection: ListView.BottomToTop
+                model: TestFetchAppendModel { }
+                delegate: Text {
+                    width: view.width
+                    height: 60
+                    verticalAlignment: Text.AlignVCenter
+                    horizontalAlignment: Text.AlignHCenter
+                    text: "Item %1".arg(model.index)
+                }
+            }
+        }
+    }
+
+    function test_dragFetchAppend() {   // QTBUG-50795
+        var scrollView = dragFetchAppendComponent.createObject(container)
+        verify(scrollView !== null, "view created is null")
+        waitForRendering(scrollView)
+        verify(scrollView.flickableItem.contentHeight === 60 * 20)
+
+        // After scrolling to the end, view should ask the model to fetch more
+        // data, content height should increase and scrollbar handle should move
+        // to the center.
+        mouseDrag(scrollView, scrollView.width - 2, scrollView.height - 8 - 16, 0, -scrollView.height + 8 + 16)
+        waitForRendering(scrollView)
+
+        // Move it again to fetch more data from the model.
+        mouseDrag(scrollView, scrollView.width - 2, scrollView.height / 2, 0, -scrollView.height / 2  + 8 + 16)
+        waitForRendering(scrollView)
+
+        mouseRelease(scrollView, scrollView.width - 2, 8 + 16)
+        waitForRendering(scrollView)
+
+        verify(Math.round(scrollView.flickableItem.contentHeight) > 60 * 20)
+        verify(Math.round(scrollView.flickableItem.contentY) < -(60 * 20))
+
+        scrollView.destroy()
+    }
 
     function test_scrollbars() {
         var component = scrollViewComponent
diff --git a/tests/auto/qquicktreemodeladaptor/tst_qquicktreemodeladaptor.cpp b/tests/auto/qquicktreemodeladaptor/tst_qquicktreemodeladaptor.cpp
index 03927fc2..96659a2c 100644
--- a/tests/auto/qquicktreemodeladaptor/tst_qquicktreemodeladaptor.cpp
+++ b/tests/auto/qquicktreemodeladaptor/tst_qquicktreemodeladaptor.cpp
@@ -73,6 +73,7 @@ private slots:
 
     void moveRows_data();
     void moveRows();
+    void reparentOnSameRow();
 
     void selectionForRowRange();
 
@@ -1152,6 +1153,56 @@ void tst_QQuickTreeModelAdaptor::moveRows()
     compareModels(tma, model);
 }
 
+void tst_QQuickTreeModelAdaptor::reparentOnSameRow()
+{
+    TestModel model(2, 1);
+    model.alternateChildlessRows = false;
+    QQuickTreeModelAdaptor1 tma;
+    tma.setModel(&model);
+
+    const QModelIndex &destParent = model.index(0, 0);
+    const QModelIndex &sourceParent = QModelIndex();
+    QVERIFY(destParent.isValid());
+    tma.expand(destParent);
+    QVERIFY(tma.isExpanded(destParent));
+
+    QSignalSpy dataChangedSpy(&tma, SIGNAL(dataChanged(QModelIndex,QModelIndex,QVector<int>)));
+    QSignalSpy rowsMovedSpy(&tma, SIGNAL(rowsMoved(QModelIndex,int,int,QModelIndex,int)));
+    QVERIFY(rowsMovedSpy.isValid());
+    QVERIFY(dataChangedSpy.isValid());
+
+    QVERIFY(model.moveRows(sourceParent, 1, 1, destParent, 2));
+
+    QModelIndex movedIndex = tma.index(3, 0, QModelIndex());
+    QVERIFY(movedIndex.isValid());
+    QCOMPARE(movedIndex.data(QQuickTreeModelAdaptor1::DepthRole).toInt(), 1);
+    QCOMPARE(tma.data(movedIndex, QQuickTreeModelAdaptor1::ModelIndexRole).toModelIndex(), model.index(2, 0, destParent));
+
+    // at least DepthRole and ModeIndexRole changes should have happened for the affected row
+    bool depthChanged = false;
+    bool modelIndexChanged = false;
+    QList<QList<QVariant> > &changes = dataChangedSpy;
+    foreach (QList<QVariant> change, changes) {
+        if (change.at(0) == movedIndex) {
+            if (change.at(2).value<QVector<int> >().contains(QQuickTreeModelAdaptor1::DepthRole))
+                depthChanged = true;
+            if (change.at(2).value<QVector<int> >().contains(QQuickTreeModelAdaptor1::ModelIndexRole))
+                modelIndexChanged = true;
+        }
+    }
+
+    QCOMPARE(depthChanged, true);
+    QCOMPARE(modelIndexChanged, true);
+
+    QCOMPARE(rowsMovedSpy.count(), 0);
+
+    model.moveRow(destParent, 2, QModelIndex(), 1);
+
+    QCOMPARE(rowsMovedSpy.count(), 0);
+    QVERIFY(tma.testConsistency());
+    compareModels(tma, model);
+}
+
 void tst_QQuickTreeModelAdaptor::selectionForRowRange()
 {
     const int ModelRowCount = 9;
diff --git a/tests/auto/shared/testmodel.h b/tests/auto/shared/testmodel.h
index d8ddd80a..6eaab74a 100644
--- a/tests/auto/shared/testmodel.h
+++ b/tests/auto/shared/testmodel.h
@@ -230,7 +230,7 @@ public:
     bool moveRows(const QModelIndex &sourceParent, int sourceRow, int count, const QModelIndex &destinationParent, int destinationChild)
     {
         Q_ASSERT_X(sourceRow >= 0 && sourceRow < rowCount(sourceParent)
-                   && count > 0 && sourceRow + count < rowCount(sourceParent)
+                   && count > 0 && sourceRow + count - 1 < rowCount(sourceParent)
                    && destinationChild >= 0 && destinationChild <= rowCount(destinationParent),
                    Q_FUNC_INFO, "Rows out of range.");
         Q_ASSERT_X(!(sourceParent == destinationParent && destinationChild >= sourceRow && destinationChild < sourceRow + count),
diff --git a/tests/auto/testplugin/testcppmodels.h b/tests/auto/testplugin/testcppmodels.h
index cb1cfb4f..03b598c4 100644
--- a/tests/auto/testplugin/testcppmodels.h
+++ b/tests/auto/testplugin/testcppmodels.h
@@ -88,6 +88,58 @@ private:
     QList<TestObject> m_testobject;
 };
 
+class TestFetchAppendModel : public QAbstractListModel
+{
+    Q_OBJECT
+public:
+    explicit TestFetchAppendModel(QObject *parent = 0)
+        : QAbstractListModel(parent) { }
+
+    virtual int rowCount(const QModelIndex &parent) const
+    {
+        if (parent.isValid()) {
+            return 0;
+        }
+
+        return m_data.size();
+    }
+    virtual QVariant data(const QModelIndex &index, int role) const
+    {
+        if (!index.isValid() || role != Qt::DisplayRole) {
+            return QVariant();
+        }
+
+        return QVariant::fromValue(index.row());
+    }
+
+    virtual bool canFetchMore(const QModelIndex &parent) const
+    {
+        Q_UNUSED(parent)
+
+        return true;
+    }
+    virtual void fetchMore(const QModelIndex & parent)
+    {
+        Q_UNUSED(parent)
+
+        addMoreData();
+    }
+
+private:
+    void addMoreData()
+    {
+        static const int insertCount = 20;
+
+        beginInsertRows(QModelIndex(), m_data.size(), m_data.size() + insertCount - 1);
+        for (int i = 0; i < insertCount; i++) {
+            m_data.append(int());
+        }
+        endInsertRows();
+    }
+
+    QList<int> m_data;
+};
+
 
 #endif // TESTCPPMODELS_H
 
diff --git a/tests/auto/testplugin/testplugin.cpp b/tests/auto/testplugin/testplugin.cpp
index 45573d92..039a59e0 100644
--- a/tests/auto/testplugin/testplugin.cpp
+++ b/tests/auto/testplugin/testplugin.cpp
@@ -40,6 +40,7 @@ void TestPlugin::registerTypes(const char *uri)
     qmlRegisterType<TestObject>(uri, 1, 0, "TestObject");
     qmlRegisterType<TestItemModel>(uri, 1, 0, "TestItemModel");
     qmlRegisterType<TestModel>(uri, 1, 0, "TreeModel");
+    qmlRegisterType<TestFetchAppendModel>(uri, 1, 0, "TestFetchAppendModel");
 }
 
 void TestPlugin::initializeEngine(QQmlEngine *engine, const char * /*uri*/)