@GrecKo I found that it is a bug that is affecting all platforms with certain screen resolutions. Some developers may not notice this issue but the end user may be using a certain screen resolution and be affected by the issue! You can login to https://bugreports.qt.io/ and Vote THIS bug if you also want this bug to be resolved.

Hi! resolvedUrl is declared in qqmlcontext.h, the definition is here: qqmlcontext.cpp#n419.

@raven-worx

Ok, a short summary.
I have an App containing a header, a Menu that can be faded in and out and a Stackview displaying different things, depending an the Menu-Selection. All nested in a Scroll area that expands, depending on the height of the qml-file displayed in the stackview and on the visibility of the menu.

To garantie that the Tumbler object is like the default Tumbleritem and that it is always at the same spot and with the same size, it has to be part of the root qml file and hast to be feed with content by the stackview and hast to send the information about the selection back again

That means a alot of signals/slots and/or cross file properties etc.

All in all something I have done before, in c++. But a lot of work for an optical gimmick and I'm tempted to leave the defalt ComboBox and SpinBox objects in there, even so it breaks the mobile-immersion

Hi and welcome to devnet,

That's a question you should rather bring to the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.

Then why not make your manager a context object of your QQmlEngine instance and then use it in your QML code to retrieve the objects you need ?

@GrecKo thanks for your comment. I've managed to create the window in which people would touch the video, but I'm not sure how to make the player. I've seen there is a library, Qt media, but I don't really know how to bind it with the other screen.

@Eeli-K Correct :-)
Wow i don't know if it good or bad that i just spent almost 2 days for less than 10 rows of code :-)

Thanks for the exemple,
this works great !

@pra7 See also https://forum.qt.io/topic/82700/datepicker-anyone. BTW you must mean Quick Controls 2, not QML2. You also can use Controls 1 elements in Controls 2 application, although the look&feel may be a problem.

@mrjj said in A basic Question:

It is odd that its not been updated since lots of activities on QML.

There was a discussion about it on the mailing list once. If I recall it correctly, the priority for Qt devs working on QML was to keep the engine fast, and make it work 100% reliable in common QML use cases (and the most common uses are: small bindings/ assignments and short functions) - so they did not feel pressure to implement newer features.

I got to know that there is no such API to set Screen orientation in QT for windows and thus I used windows API for locking app Orientation, following is the code :

Just copy paste below code in main.cpp:

#include <Windows.h> typedef enum ORIENTATION_PREFERENCE { ORIENTATION_PREFERENCE_NONE = 0x0, ORIENTATION_PREFERENCE_LANDSCAPE = 0x1, ORIENTATION_PREFERENCE_PORTRAIT = 0x2, ORIENTATION_PREFERENCE_LANDSCAPE_FLIPPED = 0x4, ORIENTATION_PREFERENCE_PORTRAIT_FLIPPED = 0x8 } ORIENTATION_PREFERENCE; typedef BOOL (WINAPI *pSDARP)(ORIENTATION_PREFERENCE orientation); pSDARP pARP; pARP = (pSDARP) GetProcAddress( GetModuleHandle(TEXT("user32.dll")), "SetDisplayAutoRotationPreferences"); if( pARP ){ pARP( (ORIENTATION_PREFERENCE)(ORIENTATION_PREFERENCE_LANDSCAPE | ORIENTATION_PREFERENCE_LANDSCAPE_FLIPPED ) ); }

For more information please refer : Handling Windows Auto-rotate feature in your application Hope it helps others .

Did you completely read the iOS note of the function and the linked articles ?

Thanks for the reply!

I'll try to explain more detail my problem: I have a UI component with list view as a content. My component was created by C++ with loading a QML file as a content which user see when using my component. In C++ class I have a property 'delegate' which I using in QML content file for set a ListView delegate. All works fine but when I try to set delegate component and use inside index I receive error 'index is not a function of property'. My question is how I need to set delegate in C++ class which give me to use model index in a delegate element.

I think will be more detail if I share my component. Please check this link.

ok. Let us look at like this. Instead of web view, put the Rectangle{}
Try to show & hide the rectangle instead of web-view. Till me whether it works or not.
Try something like this
OffLine_Pages.qml

Pane{ id: view property string local_url : "" property string pid : "" property alias vis: web.visible Rectangle{ id : web width: 200;height: 200;color: "red" visible: false } }

Ok thx guys, that was what I was worried about. I think I'll have to redo the design with a QML component though.

@johngod Okay, Thanks, i try it.

@jpnurmi Thanks !!! its working

@raven-worx If I remove the line, the keyboard will never hide and the reason for adding visible: Qt.inputMethod.visible is because of the following line that I found in an example :

/* The visibility of the InputPanel can be bound to the Qt.inputMethod.visible property, but then the handwriting input panel and the keyboard input panel can be visible at the same time. Here the visibility is bound to InputPanel.active property instead, which allows the handwriting panel to control the visibility when necessary. */

Bad luck is that it's nowhere mentioned in any docs.

ClassB, you are using it in a property.

By the way, why not use QObjectList and a Q_INVOKABLE method ? Might be more straightforward.

More information on how to integrate CPP with QML here.

@pra7, @Wieland how can I access a list of Structure inside another Structure.
Eg: From the above example, I need to use

QList<MyNewStructure> m_StructList; How is that possible? I have tried, QList<MyNewStructure> m_StructList; Q_PROPERTY(QList<MyNewStruct> newStr MEMBER m_newStr) but didnt help.

@mrjj I used Intel Driver updater tool, but i didn't get the latest driver for windows 8 (64 bit) .

Thanks, I did try createWindowContainer and it works fine but I was expecting that QQuickWidget would work too given that it's recommended before createWindowContainer. Also it seems like the same problem happens when using QOffscreenSurface with QQuickRenderControl for the same qml with canvas3d.

@LeLev Thanks , I will try the same .

I've been digging around for the last couple of days trying to find the root cause of the issue and then it turned out that even the simplest Qt Quick application will crash with the same stack trace as long as it displays some text. Likewise none of the examples that are shipped with Qt (accessible through the Welcome -> Examples screen in Qt Creator) work, they simply crash on startup.

Would it be safe to assume it's a bug with Qt 5.9.1 built using MSVS 2017 (VC14.1)?
How do I even proceed now? Do I report it on the issue tracker?

Here's the relevant backtrace:

. 0 Id: 24f8.dac Suspend: 1 Teb: 000007ff`fffde000 Unfrozen Child-SP RetAddr Call Site 00000000`0029df90 000007fe`ff58ab87 KERNELBASE!RaiseException+0x3d 00000000`0029e060 000007fe`ec6a865d msvcrt!CxxThrowException+0x87 00000000`0029e0d0 000007fe`e658ef00 dwrite!DWriteCreateFactory+0x3f51 00000000`0029e150 000007fe`e658fecb qwindowsd!createDirectWriteFactory(struct IDWriteFactory ** factory = 0x00000000`040a7428)+0x90 [c:\users\qt\work\qt\qtbase\src\platformsupport\fontdatabases\windows\qwindowsfontdatabase.cpp @ 103] 00000000`0029e190 000007fe`e658ce92 qwindowsd!initDirectWrite(class QWindowsFontEngineData * d = 0x00000000`040a7010)+0x2b [c:\users\qt\work\qt\qtbase\src\platformsupport\fontdatabases\windows\qwindowsfontdatabase.cpp @ 653] 00000000`0029e1e0 000007fe`e658b060 qwindowsd!QWindowsFontDatabase::createEngine(struct QFontDef * request = 0x00000000`0029e760, class QString * faceName = 0x00000000`0029e640, int dpi = 96, class QSharedPointer<QWindowsFontEngineData> * data = 0x00000000`0029e678)+0x1d2 [c:\users\qt\work\qt\qtbase\src\platformsupport\fontdatabases\windows\qwindowsfontdatabase.cpp @ 1888] 00000000`0029e600 000007fe`e6d4dedc qwindowsd!QWindowsFontDatabase::fontEngine(struct QFontDef * fontDef = 0x00000000`0029e760, void * handle = 0x00000000`00000000)+0x60 [c:\users\qt\work\qt\qtbase\src\platformsupport\fontdatabases\windows\qwindowsfontdatabase.cpp @ 1247] 00000000`0029e6c0 000007fe`e6d4e0f8 Qt5Guid!loadSingleEngine(int script = 2, struct QFontDef * request = 0x00000000`0029eba0, struct QtFontFamily * family = 0x00000000`04117820, struct QtFontFoundry * foundry = 0x00000000`0411b790, struct QtFontStyle * style = 0x00000000`0411b8c0, struct QtFontSize * size = 0x00000000`0411b950)+0x3dc [c:\users\qt\work\qt\qtbase\src\gui\text\qfontdatabase.cpp @ 971] 00000000`0029e820 000007fe`e6d49704 Qt5Guid!loadEngine(int script = 2, struct QFontDef * request = 0x00000000`0029eba0, struct QtFontFamily * family = 0x00000000`04117820, struct QtFontFoundry * foundry = 0x00000000`0411b790, struct QtFontStyle * style = 0x00000000`0411b8c0, struct QtFontSize * size = 0x00000000`0411b950)+0x58 [c:\users\qt\work\qt\qtbase\src\gui\text\qfontdatabase.cpp @ 1000] 00000000`0029e8d0 000007fe`e6d49fd1 Qt5Guid!QFontDatabase::findFont(struct QFontDef * request = 0x00000000`0029eba0, int script = 2)+0x2e4 [c:\users\qt\work\qt\qtbase\src\gui\text\qfontdatabase.cpp @ 2686] 00000000`0029eb60 000007fe`e6d0be28 Qt5Guid!QFontDatabase::load(class QFontPrivate * d = 0x00000000`040a3960, int script = 2)+0x3c1 [c:\users\qt\work\qt\qtbase\src\gui\text\qfontdatabase.cpp @ 2803] 00000000`0029ec60 000007fe`e6d0ae88 Qt5Guid!QFontPrivate::engineForScript(int script = 2)+0xf8 [c:\users\qt\work\qt\qtbase\src\gui\text\qfont.cpp @ 218] 00000000`0029ecc0 000007fe`e8961328 Qt5Guid!QFontInfo::family(void)+0x28 [c:\users\qt\work\qt\qtbase\src\gui\text\qfont.cpp @ 2456] 00000000`0029ed00 000007fe`e8962424 qtquickcontrols2materialstyleplugind!QQuickMaterialTheme::QQuickMaterialTheme(class QPlatformTheme * theme = 0x00000000`00000000)+0x148 [c:\users\qt\work\qt\qtquickcontrols2\src\imports\controls\material\qquickmaterialtheme.cpp @ 50] 00000000`0029ee20 000007fe`f62e30f6 qtquickcontrols2materialstyleplugind!QtQuickControls2MaterialStylePlugin::createTheme(void)+0x24 [c:\users\qt\work\qt\qtquickcontrols2\src\imports\controls\material\qtquickcontrols2materialstyleplugin.cpp @ 115] 00000000`0029ee60 000007fe`e8961d40 Qt5QuickControls2d!QQuickStylePlugin::initializeEngine(class QQmlEngine * engine = 0x00000000`0029f590, char * uri = 0x00000000`040a35b8 "QtQuick.Controls.Material")+0xf6 [c:\users\qt\work\qt\qtquickcontrols2\src\quickcontrols2\qquickstyleplugin.cpp @ 70] 00000000`0029eec0 00000000`65d9ce00 qtquickcontrols2materialstyleplugind!QtQuickControls2MaterialStylePlugin::initializeEngine(class QQmlEngine * engine = 0x00000000`0029f590, char * uri = 0x00000000`040a35b8 "QtQuick.Controls.Material")+0x40 [c:\users\qt\work\qt\qtquickcontrols2\src\imports\controls\material\qtquickcontrols2materialstyleplugin.cpp @ 89] 00000000`0029f010 00000000`65db3737 Qt5Qmld!QQmlTypeLoaderThread::initializeEngineMain(class QQmlExtensionInterface * iface = 0x00000000`040a00e0, char * uri = 0x00000000`040a35b8 "QtQuick.Controls.Material")+0xa0 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 916] 00000000`0029f060 00000000`65e61fb2 Qt5Qmld!`QQmlThread::callMethodInMain<QQmlExtensionInterface * __ptr64,char const * __ptr64,QQmlExtensionInterface * __ptr64,char const * __ptr64,QQmlTypeLoaderThread>'::`2'::I::call(class QQmlThread * thread = 0x00000000`00356790)+0x37 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\ftw\qqmlthread_p.h @ 224] 00000000`0029f0a0 00000000`65da6865 Qt5Qmld!QQmlThread::internalCallMethodInThread(struct QQmlThread::Message * message = 0x00000000`01ca50f0)+0x162 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\ftw\qqmlthread.cpp @ 322] 1 Id: 24f8.201c Suspend: 1 Teb: 000007ff`fffdc000 Unfrozen "QQmlThread" Child-SP RetAddr Call Site 00000000`0253aeb8 000007fe`fd5f10dc ntdll!NtWaitForSingleObject+0xa 00000000`0253aec0 00000000`665d372e KERNELBASE!WaitForSingleObjectEx+0x9c 00000000`0253af60 00000000`665d3307 Qt5Cored!QWaitConditionPrivate::wait(class QWaitConditionEvent * wce = 0x00000000`04072c90, unsigned long time = 0xffffffff)+0x2e [c:\users\qt\work\qt\qtbase\src\corelib\thread\qwaitcondition_win.cpp @ 118] 00000000`0253afa0 00000000`65e635fa Qt5Cored!QWaitCondition::wait(class QMutex * mutex = 0x00000000`0034fd00, unsigned long time = 0xffffffff)+0x97 [c:\users\qt\work\qt\qtbase\src\corelib\thread\qwaitcondition_win.cpp @ 179] 00000000`0253b000 00000000`65e6221f Qt5Qmld!QQmlThreadPrivate::wait(void)+0x2a [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\ftw\qqmlthread.cpp @ 62] 00000000`0253b030 00000000`65da67ef Qt5Qmld!QQmlThread::internalCallMethodInMain(struct QQmlThread::Message * message = 0x00000000`040a3650)+0x18f [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\ftw\qqmlthread.cpp @ 359] 00000000`0253b080 00000000`65d9cb1e Qt5Qmld!QQmlThread::callMethodInMain<QQmlExtensionInterface * __ptr64,char const * __ptr64,QQmlExtensionInterface * __ptr64,char const * __ptr64,QQmlTypeLoaderThread>(<function> * Member = 0x00000000`6592115c, class QQmlExtensionInterface ** arg = 0x00000000`0253b0f8, char ** arg2 = 0x00000000`0253b100)+0x5f [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\ftw\qqmlthread_p.h @ 227] 00000000`0253b0c0 00000000`65d93b7e Qt5Qmld!QQmlTypeLoaderThread::initializeEngine(class QQmlExtensionInterface * iface = 0x00000000`040a00e0, char * uri = 0x00000000`040a35b8 "QtQuick.Controls.Material")+0x2e [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 861] 00000000`0253b0f0 00000000`65e03e38 Qt5Qmld!QQmlTypeLoader::initializeEngine(class QQmlExtensionInterface * iface = 0x00000000`040a00e0, char * uri = 0x00000000`040a35b8 "QtQuick.Controls.Material")+0xae [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 1239] 00000000`0253b140 00000000`65e09df7 Qt5Qmld!QQmlImportDatabase::importDynamicPlugin(class QString * filePath = 0x00000000`0253b368, class QString * uri = 0x00000000`0253b870, class QString * typeNamespace = 0x00000000`0253b328, int vmaj = 2, class QList<QQmlError> * errors = 0x00000000`0253ba98)+0x668 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmlimport.cpp @ 2104] 00000000`0253b2c0 00000000`65e06e23 Qt5Qmld!QQmlImportsPrivate::importExtension(class QString * qmldirFilePath = 0x00000000`0253b6a8, class QString * uri = 0x00000000`0253b870, int vmaj = 2, int vmin = 1, class QQmlImportDatabase * database = 0x00000000`00356a80, class QQmlTypeLoaderQmldirContent * qmldir = 0x00000000`0407bd60, class QList<QQmlError> * errors = 0x00000000`0253ba98)+0x507 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmlimport.cpp @ 1073] 00000000`0253b610 00000000`65e02560 Qt5Qmld!QQmlImportsPrivate::addLibraryImport(class QString * uri = 0x00000000`0253b870, class QString * prefix = 0x00000000`0253b868, int vmaj = 2, int vmin = 1, class QString * qmldirIdentifier = 0x00000000`0253b860, class QString * qmldirUrl = 0x00000000`0253b858, bool incomplete = false, class QQmlImportDatabase * database = 0x00000000`00356a80, class QList<QQmlError> * errors = 0x00000000`0253ba98)+0x273 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmlimport.cpp @ 1402] 00000000`0253b730 00000000`65d9055e Qt5Qmld!QQmlImports::addLibraryImport(class QQmlImportDatabase * importDb = 0x00000000`00356a80, class QString * uri = 0x00000000`0253b870, class QString * prefix = 0x00000000`0253b868, int vmaj = 2, int vmin = 1, class QString * qmldirIdentifier = 0x00000000`0253b860, class QString * qmldirUrl = 0x00000000`0253b858, bool incomplete = false, class QList<QQmlError> * errors = 0x00000000`0253ba98)+0x280 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmlimport.cpp @ 1628] 00000000`0253b7f0 00000000`65d97f4c Qt5Qmld!QQmlTypeLoader::Blob::addImport(struct QV4::CompiledData::Import * import = 0x00000000`01cc9380, class QList<QQmlError> * errors = 0x00000000`0253ba98)+0x4ee [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 1403] 00000000`0253ba60 00000000`65d966a3 Qt5Qmld!QQmlTypeData::continueLoadFromIR(void)+0x47c [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 2481] 00000000`0253bbc0 00000000`65d9489a Qt5Qmld!QQmlTypeData::dataReceived(class QQmlDataBlob::SourceCodeData * data = 0x00000000`0253bc88)+0xb3 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 2399] 00000000`0253bc00 00000000`65d947f1 Qt5Qmld!QQmlTypeLoader::setData(class QQmlDataBlob * blob = 0x00000000`01c9aa70, class QQmlDataBlob::SourceCodeData * d = 0x00000000`0253bc88)+0x8a [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 1271] 00000000`0253bc50 00000000`65d93ff7 Qt5Qmld!QQmlTypeLoader::setData(class QQmlDataBlob * blob = 0x00000000`01c9aa70, class QString * fileName = 0x00000000`0253bcf0)+0x81 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 1260] 00000000`0253bcb0 00000000`65d9cc11 Qt5Qmld!QQmlTypeLoader::loadThread(class QQmlDataBlob * blob = 0x00000000`01c9aa70)+0x297 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 1136] 00000000`0253bde0 00000000`65db377e Qt5Qmld!QQmlTypeLoaderThread::loadThread(class QQmlDataBlob * b = 0x00000000`01c9aa70)+0x21 [c:\users\qt\work\qt\qtdeclarative\src\qml\qml\qqmltypeloader.cpp @ 876] 2 Id: 24f8.16d0 Suspend: 1 Teb: 000007ff`fffda000 Unfrozen "QQmlDebugServerThread" Child-SP RetAddr Call Site 00000000`032ac128 000007fe`fd5f1430 ntdll!NtWaitForMultipleObjects+0xa 00000000`032ac130 00000000`77492ce3 KERNELBASE!GetCurrentProcess+0x40 00000000`032ac230 00000000`7738bc3d kernel32!WaitForMultipleObjectsEx+0xb3 00000000`032ac2c0 00000000`7738905a USER32!PeekMessageW+0x1cd 00000000`032ac360 00000000`66a44761 USER32!MsgWaitForMultipleObjectsEx+0x2a 00000000`032ac3a0 00000000`66982bc8 Qt5Cored!QEventDispatcherWin32::processEvents(class QFlags<enum QEventLoop::ProcessEventsFlag> flags = class QFlags<enum QEventLoop::ProcessEventsFlag>)+0x7b1 [c:\users\qt\work\qt\qtbase\src\corelib\kernel\qeventdispatcher_win.cpp @ 648] 00000000`032af750 00000000`66982e0e Qt5Cored!QEventLoop::processEvents(class QFlags<enum QEventLoop::ProcessEventsFlag> flags = class QFlags<enum QEventLoop::ProcessEventsFlag>)+0x68 [c:\users\qt\work\qt\qtbase\src\corelib\kernel\qeventloop.cpp @ 135] 00000000`032af790 00000000`665bfcaf Qt5Cored!QEventLoop::exec(class QFlags<enum QEventLoop::ProcessEventsFlag> flags = class QFlags<enum QEventLoop::ProcessEventsFlag>)+0x18e [c:\users\qt\work\qt\qtbase\src\corelib\kernel\qeventloop.cpp @ 212] 00000000`032af840 000007fe`f60f4cc2 Qt5Cored!QThread::exec(void)+0xbf [c:\users\qt\work\qt\qtbase\src\corelib\thread\qthread.cpp @ 515] 00000000`032af8b0 00000000`665cc50d qmldbg_serverd!QQmlDebugServerThread::run(void)+0x2a2 [c:\users\qt\work\qt\qtdeclarative\src\plugins\qmltooling\qmldbg_server\qqmldebugserver.cpp @ 259] 00000000`032af970 00000000`7748652d Qt5Cored!QThreadPrivate::start(void * arg = 0x00000000`003f0e18)+0x19d [c:\users\qt\work\qt\qtbase\src\corelib\thread\qthread_win.cpp @ 380] 00000000`032afa00 00000000`775bc541 kernel32!BaseThreadInitThunk+0xd 00000000`032afa30 00000000`00000000 ntdll!RtlUserThreadStart+0x21

main.qml - What is the top level item ? Is it window or Item ?
loginform.qml - What is top level item ? Is it window or Item ?

This is typical issue of object deleted already is getting delete due to parent child relation ship ?

@GrecKo said in Binding C++ properties exposed to QML to dynamically created QML objects:

Ultimately I think that you should use imperative object creation only for temporary object needed by the UI layer, like showing a dialog for example. I have yet to see another legit usecase for it (or I don't remember it).

I will keep this in mind!

Hopefully this little discusion might help someone else struggling to understand the same concepts!

@Eeli-K Thanks for your suggestion and I will give a try.But I found a way to insert an item at the particular index by using repeaters and Object Model inside a layout, For more information can also refer below link:

https://stackoverflow.com/a/43225476/6336374

This got me thinking about how I structure things, which generally results from starting with a small one-file prototype and then breaking bits of it off into different files. Here's an example (all these can be run with qmlscene main.qml):

First you might have

File main.qml

// main.qml import QtQuick 2.7 Rectangle { id: main width: 640 height: 480 property string msg0: "Some text" property string msg1: "Some more text" Column { anchors.centerIn: parent Text {text: main.msg0} Text {text: main.msg1} } }

then you might try and organize stuff a bit:

import QtQuick 2.7 Rectangle { id: main width: 640 height: 480 Item { id: config property string msg0: "Some text" property string msg1: "Some more text" } Column { anchors.centerIn: parent Text {text: config.msg0} Text {text: config.msg1} } }

then you might split that up with a Config.qml:

import QtQuick 2.7 Item { property string msg0: "Some text" property string msg1: "Some more text" }

and main.qml now simplified to:

import QtQuick 2.7 Rectangle { id: main width: 640 height: 480 Config {id: config} Column { anchors.centerIn: parent Text {text: config.msg0} Text {text: config.msg1} } }

and then you start moving out other bits of functionality e.g adding a Messages.qml:

import QtQuick 2.7 Column { anchors.centerIn: parent Text {text: config.msg0} Text {text: config.msg1} }

and main.qml now simplified to:

import QtQuick 2.7 Rectangle { id: main width: 640 height: 480 Config {id: config} Messages {} }

I've never felt any need for singletons in QML code at all. (Having the hosting C++ set some context properties based on environment or command-line-options is the probably the closest I've come).

@Eeli-K Thanks for the suggestion it worked and also there is another approach "Component.CreateObject()" in which we can create and destroy objects dynamically.