Cascades Development

[JeffLemon]

I've checked out the docs, and it appears that there is only one reference to displayLandcape and no mention of which way the phone is round.

How can I get it so that my app supports both right-landscape and left-landscape, so when you turn the phone upside down (but still landscape) the app screen rotates.

Thanks

[simon_hain]

You can use OrientationHandler for that, like this:

OrientationHandler {
   onOrientationAboutToChange: {
     if (orientation == UIOrientation.Landscape) {
        //do stuff
     } else {
         //do other stuff
     }
   }
 }

 (you can check this out in Ekkes open source app, see https://ekkescorner.wordpress.com/ )

[Bluenoser]

It's handled automatically with absolute postioning. He is what I used for testing. Just add a 300 x 300 png and try it out.

// Default empty project template
import bb.cascades 1.0

// creates one page with a label
Page {
    Container {
        id: rootContainer
        background: background.imagePaint
        attachedObjects: [
            ImagePaintDefinition {
                id: background
                repeatPattern: RepeatPattern.XY
                imageSource: "asset:///pattern/grasstile.png"
            },
            OrientationHandler {
                id: handler
                onOrientationAboutToChange: {
                    if (orientation == UIOrientation.Portrait) {
                        logo.preferredWidth = 150.0
                        logo.preferredHeight = 150.0
                    } else if (orientation == UIOrientation.Landscape) {
                        logo.preferredWidth = 300.0
                        logo.preferredHeight = 300.0
                    }
                }
                onOrientationChanged: {
                }
                onDisplayDirectionChanged: {
                }
            }       
            
        ]
        layout: AbsoluteLayout {
        }
        ImageView {
            id: logo
            imageSource: "asset:///images/logo300.png"
            scalingMethod: ScalingMethod.None
            layoutProperties: AbsoluteLayoutProperties {
                positionX: 50.0
                positionY: 50.0
            }
            preferredWidth: 150.0
            preferredHeight: 150.0
        }
        onCreationCompleted: {
            OrientationSupport.supportedDisplayOrientation =
            SupportedDisplayOrientation.All;
        }
    }
}

[JeffLemon]

Sorry, this does not answer my question, you appear to have portrait orientation too. i want to know how to support both types of LANDSCAPE orientation, ideally in C++ too.

[Bluenoser]

If you try out the code, you will see that you get the same look whether left or right landscape mode. At least it works that way on my Alpha Dev device.

[smcveigh]

it's entirely valid to want to know whether you are in a clockwise rotated landscape orientation or a counter-clockwise rotated landscape orientation.

for example, you may care about which way the accelerometers on the physical device are now oriented, or which way the camera is now positioned so that you can take pictures correctly.

in any event, search the Cascades docs for DisplayDirection.  You will see that this property is exposed in various orientation-related objects and handlers, etc.

Cheers,

Sean

[JeffLemon]

I have orientation working. I can do one rotation and the display changes etc. Any subsequent orientation changes have no effect with the error:

Warning: bb::cascades:rientationSupport(0x172668) onOrientationCheck: Wrong state when receiving orientation check: 1 

Any ideas?

[smcveigh]

There is some sample code in the docs you might want to look at.

https://developer.blackberry.com/cascades/reference/bb__cascades__qmlorientationhandler.html

[JeffLemon]

But that's for QML, not C++.

I converted it to C++ and I still get the same error:

Warning: bb::cascades:rientationSupport(0x190668) onOrientationCompleted: Wrong state when receiving orientation completed: 1