Cascades Development

[skyhawk92]

Hi guys,

anyone have any idea why setting a background to container like this, would prevent application to start(application closes before it fully starts) ?

Page *appPage = root->findChild<Page*>("mainPage");
    	Container *container1 = appPage->findChild<Container*>("firstContainer");
    	container1->setBackground(Color::Green);

[dishooom]

The setBackground() expects an argument of ImagePaint or ColorPaint type and not a Color.

ColorPaint class is used for retrieving the colors used in  fields in BB' s native theme. Such as the textColor used in SystemDefaults. Specific RGB values cannot be used here at the moment.

http://developer.blackberry.com/cascades/reference/bb__cascades__colorpaint.html

Dishooom

[oliver_kranz]

In QML this works.

Container {
    background: Color.create("#FF00FF00")
}

[skyhawk92]

Yes, in QML but in C++ ?

The point was to be able to change different "themes"(colors) of application through menu.

[dishooom]

One way to get this done is by adding a javascript function in your qml file to set the background property of the container as shown

 function setColorYellow() {
            bellContainer.background = Color.Yellow
        }

 Then, from the CPP file you can invoke this method for the container as

  Container* con = bb::cascades::Application::instance()->findChild<Container*>("bellContainer");
    QMetaObject::invokeMethod(con, "setColorYellow");

May be there's an easier way to get this done, but this is one that does work for me.

 - Dishooom

[Zmey]

This should also work:

container1->setBackground(Color::fromARGB(0xff996633));

http://developer.blackberry.com/cascades/reference/bb__cascades__color.html

Or using a builder:

Container *someContainer = Container::create().background(Color::fromARGB(0xff996633));

There are also predefined values for colors like Color::Red.

The code in first post looks correct:

Container *container1 = appPage->findChild<Container*>("firstContainer");
    	container1->setBackground(Color::Green);

It could crash because Container with id 'firstContainer' wasn't found among the children of appPage.

You can check that container1 is not NULL by logging it's value or setting a breakpoint on next line and running the app in debugger. Also ensure that appPage itself is not NULL.

[skyhawk92]

Yep, appPage is NULL but I don't have any idea why ?

In QML it has objectName: mainPage
then in C++ I call Page *appPage = root->findChild<Page*>("mainPage");

[skyhawk92]

If i findChild a button it works normaly( is not NULL),
but if try to find Page or Container they are NULL.