Call C++ function from Cascade QML - c++

Question

I want to call C++ function from Cascade QML
this is CalcolatorQML.cpp
// Default empty project template
#include "CalcolatorQML.hpp"
#include <bb/cascades/Application>
#include <bb/cascades/QmlDocument>
#include <bb/cascades/AbstractPane>
#include <QDebug>
using namespace bb::cascades;
CalcolatorQML::CalcolatorQML(bb::cascades::Application *app)
: QObject(app)
{
// create scene document from main.qml asset
// set parent to created document to ensure it exists for the whole application lifetime
QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
// create root object for the UI
AbstractPane *root = qml->createRootObject<AbstractPane>();
// set created root object as a scene
app->setScene(root);
//Container *container = root->findChild<Container*>("myContainer");
}
void CalcolatorQML::injectContainer(){
qDebug("NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN");
}
and I declare the function as Q_INVOKABLE void injectContainer();
this is CalcolatorQML.hpp
// Default empty project template
#ifndef CalcolatorQML_HPP_
#define CalcolatorQML_HPP_
#include <QObject>
namespace bb { namespace cascades { class Application; }}
/*!
* #brief Application pane object
*
*Use this object to create and init app UI, to create context objects, to register the new meta types etc.
*/
class CalcolatorQML : public QObject
{
Q_OBJECT
public:
CalcolatorQML(bb::cascades::Application *app);
virtual ~CalcolatorQML() {}
Q_INVOKABLE void injectContainer();
};
#endif /* CalcolatorQML_HPP_ */
and this is my main.qml, you can see in b1 click this statement injection.injectContainer1();
import bb.cascades 1.0
Page {
content: Container {
Container {
layout: StackLayout {
}
TextField {
id: textFieldId
}
Container {
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
verticalAlignment: VerticalAlignment.Center
horizontalAlignment: HorizontalAlignment.Center
Button {
id: b1
text: "1"
onClicked: {
injection.injectContainer();
}
}
Button {
id: b2
text: "2"
}
Button {
id: b3
text: "3"
}
}
Container {
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
verticalAlignment: VerticalAlignment.Center
horizontalAlignment: HorizontalAlignment.Center
Button {
id: b4
text: "4"
}
Button {
id: b5
text: "5"
}
Button {
id: b6
text: "6"
}
}
Container {
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
verticalAlignment: VerticalAlignment.Center
horizontalAlignment: HorizontalAlignment.Center
Button {
id: b7
text: "7"
}
Button {
id: b8
text: "8"
}
Button {
id: b9
text: "9"
}
}
Container {
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
verticalAlignment: VerticalAlignment.Center
horizontalAlignment: HorizontalAlignment.Center
Button {
id: b0
text: "0"
}
}
Container {
layout: StackLayout {
orientation: LayoutOrientation.LeftToRight
}
verticalAlignment: VerticalAlignment.Center
horizontalAlignment: HorizontalAlignment.Center
Button {
id: bPlus
text: "+"
}
Button {
id: bMult
text: "*"
}
Button {
id: bEqual
text: "="
}
Button {
id: bDivide
text: "/"
}
Button {
id: bMinus
text: "-"
}
}
}
}
}// end of Page
My problem is the function injectContainer not invoked
Thanks

Answer 1

In CalcolatorQML.cpp, before the line:
AbstractPane *root = qml->createRootObject<AbstractPane>();
add:
qml->setContextProperty("app", this);
Then within onClicked in your QML, try:
app.injectContainer();

Answer 2

try this one
AbstractPane *root = qml->createRootObject<AbstractPane>();
qml->setContextProperty("root", this);
In the Qml onClick write
root.injectContainer();