Need help with populating QML TreeView

infinicat

I'm trying to populate a TreeView in a QML file. I'm using the Simple Tree Model example as a guide. From the example, I'm using the same data file and TreeItem and TreeModel classes. The difference though is that my TreeView is instantiated in the QML as opposed to in C++.

My problem is that the tree is empty, no data appears. I'm not getting an errors. I know that the data is correctly retrieved from the file and the property get function (getTreeViewModel) is called but TreeView doesn't seem to do anything with it.

I don't know if I'm supposed to force some kind of update but I don't know how to do that.

Any help would be appreciated. I've pasted some of the code below. I'm using Qt 5.5.1. Thanks.

CPP:

TreeViewTest::TreeViewTest() : m_treeViewModel(0){
	QFile file(":/default.txt");
	if(file.open(QIODevice::ReadOnly)){
		m_treeViewModel = new TreeModel(file.readAll());
		file.close();
	}
	m_qmlEngine.rootContext()->setContextProperty("myTreeView", this);
	m_qmlEngine.load(QUrl(QStringLiteral("qrc:/qml/mainWindow.qml")));
}
TreeViewTest::~TreeViewTest(){
	delete m_treeViewModel;
}

Header:

class TreeViewTest : QObject {
	Q_OBJECT
	Q_PROPERTY(QAbstractItemModel* treeViewModel READ getTreeViewModel)
public:
	explicit TreeViewTest();
	~TreeViewTest();

public slots:
	QAbstractItemModel* getTreeViewModel() {return m_treeViewModel;}

private:
	QQmlApplicationEngine m_qmlEngine;
	TreeModel* m_treeViewModel;
};

QML:

Item {
	id: item1
	width: 640
	height: 480

	TreeView {
		id: treeView1
		width: 500
		height: 450
		model: myTreeView.getTreeViewModel()
	}	
}

p3c0

Hi @infinicat You need to define role name too in case of accessing C++ models from QML. This can de done by re-implementing roleNames(). Have you implemented it in your model ? If not then, check this post.

infinicat

Thank you. That worked.