Cascades Development

[nimithingu]

How to acheive this? How to call a QML function from c++ file.

I have a List view and an activity indicator in the qml and after fetching the xml data from a web service call i am unable to set the datamodel as the XMLDatamodel is not working GroupDataModel is working but for it to work i have to use Datasource and I am unable to set the type property of the DataSoure in c++ 

I am trying below code to load data to GroupDataModel

dataModel = new GroupDataModel();

DataSource *ds = new DataSource(this);
ds->setSource(QUrl("file://" + QDir::homePath() + "/model.xml"));

ds->setType(bb::data::DataSourceType::Type.Xml);
ds->setQuery("/ArrayOfPeople/People");

 By this i get Compilation error at  

ds->setType(bb::data::DataSourceType.Xml);

error :  expected primary-expression before '.' token

So for the work around I wish to load the DataSource and Model from QML function but that function should be called ones the network connection has fetched the data and stored it in the file.

Please hel me on this...

[kylefowler]

im not sure what that : is but it should be bb::data:ataSourceType::Xml

to access enumerations in c++ you use :: and not .

[nimithingu]

I also tried :: but still no luck, is there a way to call the QML function where i can load the Datasource object with its values....

[kylefowler]

What is "the qml function"?

[nimithingu]

Its not been made.. as I dont know how to?
If possible then would want to make a function in which I can pass the QNetworkReply data and set that data to Datasource..
Thank you for your reply.

[RileyGB · Accepted solution]

You should emit a signal from c++ and set up a slot in qml to connect to it. 

Example:

C++

mQmlDocument->setContextProperty("_myClass", myClass);

emit mySignal()

QML:

_myClass.mySignal.connect(doSomething);

function doSomething() {
    // logic here
}

[nimithingu]

HI,

I tried this but I am getting Unknown property error in QML editior below is what i did

c++ .cpp file

QmlDocument *qml = QmlDocument::create("asset:///SearchResults.qml").parent(this);
qml->setContextProperty("peoplefinder", this);

Page *page = qml->createRootObject<Page>();
qml->setParent(page);

// Retrieve the list so we can set the data model on it once
// we retrieve it
mListView = page->findChild<ListView*>("resultlist");

mNavigator->push(page);

c++ .hpp file i defined the signal

Q_SIGNALS :
	void mySignal();

In QML file

peoplefinder.showAlert.connect(doSomething);

function doSomething() {
//My logic
}

am i doing some thing wrong in this.

[Zmey]

Hi!

You named the signal 'mySignal' but connecting to 'showAlert'. Name mismatch.

Also I think the following line isn't needed. Page shouldn't own QmlDocument.

QmlDocument's parent was already set to 'this' on creation.

qml->setParent(page);

[ujwalapatil]

Thank you! Its working....

C++

mQmlDocument->setContextProperty("_myClass", myClass);

emit mySignal()

QML:

_myClass.mySignal.connect(doSomething);

function doSomething() {
    // logic here
}

[nimithingu]

Yes its working but I had to declare in hpp file like below

signals:
	void mySignal();

 and Not as

Q_SIGNALS :
          void muSignal();

because of which my code was not working thanks.