The sample does not not on the BlackBerry website

Hi, again I am trying to run an example of BlackBerry web site. This time, this one:

"C++ objects in QML injection" (the last section at the bottom) - page:

https://developer.BlackBerry.com/Cascades/documentation/dev/integrating_cpp_qml/index.html,

This is my code:

CPP file

#include "CombineCppAndQml.hpp"

#include 
#include 
#include 

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using namespace bb::cascades;

CombineCppAndQml::CombineCppAndQml(bb::cascades::Application *app)
: QObject(app)
{
    QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
    qml->setContextProperty("injection", this);
    AbstractPane *root = qml->createRootObject();
    app->setScene(root);
}

void CombineCppAndQml::injectContainer()
{
    // Creates the container and adds it to the root
    // container in qml
    mRootContainer->add(Container::create()
        .background(Color::Red)
        .preferredSize(200,200)
        .bottomMargin(20)
        .horizontal(HorizontalAlignment::Center));
}

PPS file

#ifndef CombineCppAndQml_HPP_
#define CombineCppAndQml_HPP_

#include 

 #include 
#include 

namespace bb { namespace cascades { class Application; }}

using namespace bb::cascades;

class CombineCppAndQml : public QObject
{
    Q_OBJECT
public:
    CombineCppAndQml(bb::cascades::Application *app);
    virtual ~CombineCppAndQml() {}

    // By using Q_INVOKABLE we can call it from qml
    Q_INVOKABLE void injectContainer();

private:
    Page *appPage;
    Container *mRootContainer;
};

#endif /* Test_Hpp_ */

and the qml file on the Web Site.

import bb.cascades 1.0

Page {
    // Allows the user to scroll vertically
    ScrollView {
        scrollViewProperties {
            scrollMode: ScrollMode.Vertical
        }
        // Root container that containers from C++ are added to
        Container {
            objectName: "rootContainer"
            layout: StackLayout {}
            // Button that calls the C++ function to add a
            // new container. The selectedIndex from the drop down
            // is passed to C++.
            Button {
                text: "Add container"
                onClicked: {
                    injection.injectContainer();
                }
            }
        }
    }
}

When I run it, I actually see the button, but when I click it to open the second container, my application gets reduced to the place to show the new container.

PPS. I also have a class separate main.cpp which calls the class CombineCppAndQml.

Any help much appreciated.

Please add the following line to your CombineCppAndQml constructor

mRootContainer = root-> findChild(("" rootContainer"'));

CombineCppAndQml::CombineCppAndQml(bb::cascades::Application *app)
: QObject(app)
{
    QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
    qml->setContextProperty("injection", this);
    AbstractPane *root = qml->createRootObject();
    app->setScene(root);

    mRootContainer = root->findChild("rootContainer");
}

-Dishooom

--------------------------------------------------------------------------------------------------------------------------------

Hope this helps

Tags: BlackBerry Developers

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