Launch of QObject::connect() app causing crash

Hello

I am trying to learn a few tricks of Cascades SIGNAL and SLOT and want to write a custom slot that sets the value of a slider when you press an ImageView. However, when I include the code of the connect() function in my application, it compiles well but the app crashes during launch of "BlackBerry 10" screen

Here is my code:

 // Create the slider
    Slider* opacitySlider = Slider::create().leftMargin(20.0f).rightMargin(20.0f);
    opacitySlider->setLayoutProperties(StackLayoutProperties::create().spaceQuota(1.0f));
    opacitySlider->setHorizontalAlignment(HorizontalAlignment::Fill);

    // Create the moon icon
    ImageView* moon = ImageView::create("asset:///images/moon.png");
    moon->setVerticalAlignment(VerticalAlignment::Center);

My connection code is here. Note When I connect, Q_ASSERT, put in comment and Q_UNUSED lines, the code works fine:

    bool result2 = connect(moon, SIGNAL(onTouch(bb::cascades::TouchEvent *event)), this, SLOT(zeroOutSlider(bb::cascades::TouchEvent *event)));
    Q_ASSERT(result2);
    Q_UNUSED(result2);

My location is defined as:

void ApplicationUI::zeroOutSlider(bb::cascades::TouchEvent *event){

    if(event->isUp()){
        // Error: opacitySlider is not declared in this scope.
        //opacitySlider->setValue(0.0f);
    }

}

Note that I also comment little opacitySlider-> setValue() which is not recognized and raises a compile error.

I tried using QML and it works fine, but I want to use custom for more elaborate things C++ functions (tried to use this Guide). Thought that I would start to base, but it does not work.

Any help is appreciated

Hello! It seems that the app is not crashing, but stops at Q_ASSERT because connect() fails and returns false. If the logs are configured correctly, you should see an error message as well.

The signal is called 'touch', not of onTouch. 'on' prefix is added to the managers of signals QML. Thus, the correct signal statement is:

SIGNAL (touch (bb::cascades:TouchEvent *))

Parameter names must be omitted in SIGNAL() and SLOT().

To resolve this problem:

// Error: opacitySlider is not declared in this scope.
        //opacitySlider->setValue(0.0f);

opacitySlider can be declared as a member variable (in the header file). It will be accessible to all functions of the class.

Tags: BlackBerry Developers

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