Glad you found out and thanks for sharing !

Use a separate QObject-derived class and set it as context property.

Other options:

https://doc.qt.io/qt-5/qtqml-cppintegration-topic.html https://doc.qt.io/qt-5/qtqml-cppintegration-interactqmlfromcpp.html

Hi everyone! I've solved this problem. In my case the problem was in asynchronous load images into another thread. When I changed asynchronous method to the synchronous all work fine.

@Ilja
Super good to hear.
Thank you for the feedback.
happy programming.

I fixed the issue by dropping the source string from the .metainfo files.

For anyone that cares I was following these instructions: http://doc.qt.io/qtcreator/creator-qml-modules-with-plugins.html and on step 5 I picked a random metainfo file when I searched the Qt folder for .metainfo, not the one they specifically chose (qtcharts.metainfo vs qtquickcontrols2.metainfo)

The qtcharts one was probably for some other type of module use where specifying the source does something I don't need, the qtquickcontrols2 ended up having the syntax I really wanted in the end. Eventually I found this example and found out dropping the source worked: https://forum.qt.io/topic/56207/how-to-load-custom-qml-controls-into-the-qml-designer

@MaxL Yes! That did it. I had been misusing that option from the start. Thanks for spotting it!

Thanks for the feedback.
I have a follow up question though.

Where are QML's default role names documented? I couldn't see the list. It would save me a lot of time. EDIT Here they are: link.

@raven-worx Thanks for your answer. There is no other place in the code where I update/modify the model. Also the combo box is already created when the slot is connected and called, if this is what you meant. Initially I declare the combo box as such with an empty model:

ComboBox { id: comboInput visible: false anchors.fill: parent model: ListModel { id: model } }

And this is the connection in C++ (plus the code to get the settings view inside which the combo box exists):

//Connect signals emitted and received by Settings Form m_pQmlRoot = qmlEngine.rootObjects()[0]; item = qvariant_cast<QObject*>(m_pQmlRoot->property("settingsPage")); QObject::connect(bluetoothManager, SIGNAL(sig_DeviceDiscovered(QVariant)), item, SLOT(slot_deviceDiscovered(QVariant)));

I've had problems with the way Sketch exports SVGs.

Text drifts (as you have seen), and items that were rotated in Sketch unrotate themselves when exported.

I'd suggest that you export as a PNG, rather than SVG.

Hi,

What graphic hardware are used on these machines ?
Version of the driver ?

Also note that 5.7 is outdated, you should consider updating to the current LTS which is Qt 5.9.4 or even 5.10

@jpnurmi said in Can QTest or Qt Quick Test be used for automated system (not unit) testing of QtQuick Control2/C++ application?:

How about Squish? It's also used for release test automation of Qt.

Thank you for the suggestion! Yes we noticed Squish. But now we develop an application prototype using QML and until some milestone would like not to use commercial tools. On the other hand we don't need a thorough test coverage yet. We'd like mostly sanity tests to validate. And we want to try Qt test frameworks or implement feeding navigation commands and verification ourselves with Qt C++/QML means.

need to check Qt classes for system settings and native look and feel,
and of adopting those changes for App.

Thanks,

@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 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.

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.

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.

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.

Hi,

If you want to mix widgets and QML then you should use QQuickWidget.

Hi,

At V-Play, we have an example on how to achieve this in our Twitter sample app. Check out the screenshots: (Sorry, didn't have time to record an animation ;) )

This sample needs the V-Play SDK to run, which might be useful if you are into app development.
If you don't want to install a third-party SDK, you still might be able to get some inspiration from the sample app.

Cheers,
Lorenz

Hi everyone!

I've found the problem in my component. I was forgot this line in my constructor:

m_contentItem = Q_NULLPTR;

So, all works fine for now! Thanks all for the help.

@diredko Why passing it once using a normal function (Q_INVOKABLE) would hurt performance in your opinion? It would certainly be more efficient to have a big list in QML than use a function again and again, and such a list isn't big for modern hardware (couple of hundreds of KBytes maybe). If you can afford to have that list in C++ you should be able to afford to have it in QML, too.

I think the biggest performance obstacle is that the system isn't real-time, QML may do garbage collection and animation isn't fluent. I recommend just testing with the most easy solution in the lowest end hardware it will be run on and deciding after that if it's enough.

@romsharkov
Hi there,

Do I understand correctly that you have managed to run a QQmlProcess in a separate process?

I am asking it because I have came across pretty much the same problem:
https://github.com/sailfish-sdk/sdk-harbour-rpmvalidator/pull/79#issuecomment-307348648

If you could tell me some words of you implementation details that would be awesome!
Thanks in advance!

Thanks for the reply! I will check the topic.

Yes, I did see that example, however how to run it? it builds a library (how do I connect that to a normal app?)
And is that the best way to build an app that heavily relies on the drawn graphics?

@ganeshkbhat Allowing to load and run 3rd C++ inside your main applications's process is very dangerous and we have not found any easy way to sandbox C++ so far, only just have a few ideas worth trying. I've described this issue here in a little more detail.

I tried to understand by reading your description. I should appreciate your patience to write this whole description.

Coming to you issue, you are using model and view with View has single column. You are using the repeater. It is single column there. This requests for index with row and column=0. This is how it works always. If you are using TableView with appropriate TableModel then it will request for row and column values.

Thank you for sharing!

Build Qt qml plugin for iOS (static plugin)

Plugin Pro file like flow:
TEMPLATE = lib
TARGET = iostestqmlplugin
QT += qml quick
CONFIG += qt plugin c++11 static
uri = IosQmlPluginTest # module name
QMAKE_MOC_OPTIONS += -Muri=$$uri # static plugin must use this

2.qmldir file
module IosQmlPluginTest
plugin iostestqmlplugin
typeinfo plugins.qmltypes #static plugin required
classname IosqmlpluginPlugin # static plugin must set classname for plugin c++ class

TimeLabel 1.0 qrc:/TimeLabel.qml # your self qml document

3.qrc file must contains qmldir file, Qt default put qmldir in qrc file with prefix likes: “/qt-project.org/imports/your-plugin-modele-name”, You can special yourself prefix but must endwiths “your-plugin-module-name” and in main cpp need add addImportPath(eg: engine.addImportPath(“qrc:/your-self-prefix-not-contains-your-plugin-module-name”))

4.put plugins.qmltypes, qmldir and plugin library files together into where Qt install dir’s sub fold name qml($$[QT_INSTALL_QML] Qt default serach path), maybe you can special yourself path in your app pro file by variable QMLPATHS(QMLPATHS += /your/plugin/path)

Init the plugin resources(contains qmldir) at plugin c++ class construction function like:Q_INIT_RESOURCE(your-qrc-file-name);

6.pulugins.qmltypes file it’s required. can gernerate by qmlplugindup tool.

7.refrence QtWebView plugin project from Qt source

usually error:
1.static plugin for module “QtQuick” with name “your-module-name” has no metadata URI
fix by add in pro file:QMAKE_MOC_OPTIONS += -Muri=$$URI #URI = your-module-name
thanks from:https://github.com/wang-bin/QtAV/issues/368

2.Plugin “your-module-name” is missing a classname entry
fix by add in qmldir file: classname your-plugin—c++-name
Reference http://doc.qt.io/qt-5.6/qtqml-modules-qmldir.html

module “your-plugin-module-name” is not installed
fix by: Qmldir file must in plugin qrc file, plugins.qmltypes need in the plugin dir and special in qmldir

I also use a QQmlComponent for loading a qml file. I use this file for the application settings (i exploit the QmlEngine for this so I can get away easy with creating my settings files as if they were qml files).

m_mcdeSettingsComponent(new QQmlComponent(m_settingsEngine, this)); m_mcdeSettingsComponent->loadUrl(QUrl::fromLocalFile(QApplication::applicationDirPath() + QDir::separator() + "config.rc"), QQmlComponent::Asynchronous); void Core::onSettingsComponentStatusChanged(const QQmlComponent::Status &status) { ... ... // here i create my component with: if (status == QQmlComponent::Ready) { m_mcdeSettingsComponent->create(); // other operations ... } else { ... } }

Seeing as i load them both at the same time (the settings and the quickview) could it be that for some reason they mess up with each other?

SOLUTION: i added the "projectToSecondScreen" call at the end of the loading of the QQmlComponent i use for loading my qml plugins i use and all is well. The QQuickView is correctly created and shown.
( or load the QQmlComponent with QQmlCompnent::PreferSynchronous)

QUESTION
Why does this error occur? What happens during the loading of the QQmlComponent that messes up the loading of the QQuickView if done simultaneously?

Ok thanks for your help.

here is the solution:
https://forum.qt.io/topic/76802/how-to-enable-virtual-keyboard-languages/5