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]@ ?