QML context of dynamically generated items

[ttuna]

Hello,

I'm trying to figure out in which context dynamically generated items are being stored?
Therefor let me explain my scenario.

First I've registered two new QML types:
@qmlRegisterType<MyViewController>("uicontrollers", 1, 0, "ViewController");
qmlRegisterType<MyTabController>("uicontrollers", 1, 0, "TabController");@

Then I used them in qml files:

mainview.qml
@Rectangle {

Component
{
    id: tab_factory
    MyTab {}
}

TabView
{
    id: a_tabview
    //some code here ...
}

ViewController
{
    id: view_controller
    objectName: "myViewController"

    onNewTab:
    {
        var tab_obj = tab_factory.createObject(a_tabview)
        var a_tab = a_tabview.addTab(a_name, tab_obj)
        a_tab.active = true
    }

}@

MyTab.qml
@Component
{
id: the_tab

Rectangle {
    id: tab_frame
    border.width: 0

    property string the_name: ""

    SplitView
    {
        id: a_tab_split

        // some items here ...
    }

    TabController
    {
        id: my_tab_controller
        objectName: "myTabController"

        Component.onCompleted:
        {
            console.log(my_tab_controller)
        }
    }
}

}
@

Dynamic tab creation works fine from my C++ class.
Therefor I use the function described below to find my ViewController and emit newTab signal.
But when I try to find the created TabController in the QML context I get no results:

uicontroller.h
@//*****************************************************************************
//** Template FindMyQMLObjects
//*****************************************************************************
template<typename T> QList<T> FindQMLObjects(QString in_name)
{
QList<T> ret;
QList<QObject*> root_obj_list = m_engine.rootObjects();

foreach(QObject* obj, root_obj_list)
{
    qDebug() << "root_obj name: " << obj->objectName();
    ret = obj->findChildren<T>(in_name, Qt::FindChildrenRecursively);
    if (ret.size() > 0) break;
}
return ret;

}
@

Any idea where my QML objects are hiding?

Thanks for your help.
Best regards,
Rainer

[dheerendra]

Since you are passing the parent as Tab_view, it should be children of the tabview only. It will be in the current context itself. Here is the sample which I tried and it works perfectly.

I suspect that either object is not created or you are not iterating the correct object. Try with following code snippet. It should work
@

QQuickView view;
view.setSource(QUrl(QStringLiteral("qrc:///main.qml")));
view.show();

QQuickItem *item = view->rootObject();
QQuickItem *obj = qobject_cast<QQuickItem >(item->findChild<QQuickItem>("myObj"));
if (obj)
qDebug() << "My name is ="<<obj->objectName();
@

[ttuna]

Dheerendra: Thanks for your reply.

Since I'm using
@QQmlApplicationEngine m_engine;@
in my application and searching over all possible rootObjects @QList<QObject*> root_obj_list = m_engine.rootObjects();@
with
@ret = obj->findChildren<T>(in_name, Qt::FindChildrenRecursively);@
I'm quite sure that I'm iterating over all possible Items, e.g. searching the ViewController works fine.

Due to log output I'm even quite sure that the TabController item is created correctly.

I have tried some variations to access the TabController from ViewController in qml file:

@
...
var a_tab = a_tabview.addTab(a_name, tab_obj)
...
var a_item = a_tab.item // this is the Rectangle in MyTab.qml
var a_tab_controller = a_tab.TabController // this returns some [object Object] but I don't know how I can access the TabController item within!?!
var res_tab_controller = a_tab.item.resources[0] // this returns the TabController item but I think it's not a proper way to retrieve resources[0]
@

This happens before I search the TabController from C++ code.

[dheerendra]

How are you giving object name ? For createObject can you pass the objectName as well ?. You can try some thing like the following and see

@ var obj = component.createObject(parent, {"objectName" :"myObj", "x": 100, "y": 100});@

[ttuna]

I have defined the objectName in MyTab.qml.
findChildren<>() should return a list of all Items with the given objectName.

Any suggestions how I can access the TabController within
@var a_tab_controller = a_tab.TabController@ which returns some
@[object Object]@ ?