Access a drop-down list component created in fom runtime C++

Hello everyone.

I included a file "Settings.qml" as a ComponentDefinition in my file "main.qml" as follows:

*******************************
main.qml
*******************************

Page {
    id: page

    //App menu
    Menu.definition: MenuDefinition {
        settingsAction: SettingsActionItem {
            title: "Settings"
            imageSource: "asset:///icons/ic_settings.png"
            onTriggered: {
                var settings = settingsSheet.createObject(_cam);
                settings.open();
            }
        }
    }

    //Main container
    Container {        Camera {            id: cameraQML            objectName: "cameraQML"        }    }

    //Attached objects
    attachedObjects: [
        //*****this is the component definition****
        ComponentDefinition {
            id: settingsSheet
            source: "Settings.qml"
        }
    ]
}

Then, in the "Settings.qml" file, I have something like that.

On the crack of onCreationCompleted I call you access of wich C++ function to the cameraQML component and gets the available resolution values and add them to the drop down list component.

***********************Settings.qml***********************

Sheet {
    id: settingsSheet
    objectName: "settingsSheet"
    peekEnabled: true
    content: Page {        Container {            DropDown {
                title: "Capture Resolution"
                objectName: "resolution"

                options: [
                    Option {
                        text: "16:9"
                        value: 16/9
                    }
                ]

                onCreationCompleted: {
                    _cam.loadResolutionValues();
                }

                onSelectedValueChanged: {
                    //_cam.selectResolution(selectedValue);
                }
            }
        }    }}

The PROBLEM comes when I try to access the menu item drop down because, even if I get error when you call the function findChild(), I do when I try to add Options by calling the add() function:

******************applicationui.cpp******************

AbstractPane* root;Camera* cameraQML;DropDown* resolutionsDD;

void AppliactionUI::ApplicationUI() {    //code...    QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);    qml->setContextProperty("_cam", this);    root = qml->createRootObject();    cameraQML = root->findChild("camera");    //code...}void ApplicationUI::loadResolutionValues() {
    QVariantList reslist = camaraQML->supportedCaptureResolutions(CameraMode::Photo);
                //**I don't get error by calling this function
        resolutionsDD = root->findChild("resolution");

        //**The app do crashes when calling any of these three functions
    //resolutionsDD->setTitle("Choose an option");        //resolutionsDD->removeAll();
    //resolutionsDD->remove(resolutionsDD->at(0));    for (int i = 0; i < reslist.count(); i++) {
        qDebug()<<"QVatiant value:"<add(Option::create().text(res.width()+"x"+res.height()).value(reslist[i]));
    }
}

I thought it was a problem with the type of value, I was put in the service. value() when you create an option, but then I realized that, while trying to change the title from the drop-down list, or delete i ' ts options that the application crashed also.

This makes me think that the problem is that I'm not a correct reference for component drop-down menu QML due to the fact that this drop-down list does not exist when the application starts and is created until the user opens the Settings.qml file. Also, I think that this is a problem with all that stuff parent and child, but of course, it's just a feeling.

I'd really appreciate your help on this type of problem. I'm not experienced enough to know what is the right way to get a reference of work to the drop down list component in question in a situation like this

Thank you very much in advance!

P.D. I'm sorry, I know that my English is not very good. Hope you do not misunderstand

Hello
Very probably findChild returns NULL and a NULL pointer dereference causes the crash. I remember there was problems with findChild during the use of the leaves.

Try from the drop-down list directly to the function as an argument:

(1) in applicationui.cpp:

After:
QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);

Add:
    // This is needed for passing DropDown in function parameters from QML to C++
    qmlRegisterType("bb.cascades", 1, 0, "DropDown");

(2) modify the function declaration for:

Q_INVOKABLE void loadResolutionValues(bb::cascades::DropDown *dropDown);

(3) in QML:

DropDown {
  id: dropDown
  ...
  onCreationCompleted: {
     _cam.loadResolutionValues(dropDown)

     // _cam.loadResolutionValues(this) // maybe this will also work, but I haven't checked

  }
}

Tags: BlackBerry Developers

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