[Interest] Using QtQuick 2.0 Screen.orientation

[Jim Hodapp]

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Rutledge,

On 03/05/2013 09:02 AM, Rutledge Shawn wrote:
> On 25 Feb 2013, at 11:11 PM, Jim Hodapp wrote:
> 
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>> 
>> I'm attempting to be notified in my QML application of when the 
>> underlying QScreen instance (one that I've implemented for my
>> platform as a QPA plugin) changes the orientation property. In my
>> QPA plugin, I am calling
>> QWindowSystemInterface::handleScreenOrientationChange() any time
>> after I set the orientation, and have also implemented the 
>> orientation() function. I call it like so:
>> 
>> QWindowSystemInterface::handleScreenOrientationChange(QPlatformScreen::screen(),
>>
>> 
currentOrientation_);
>> 
>> On my QML side, I simply have a Rectangle, and inside that
>> rectangle I have the following signal handler:
>> 
>> Screen.onOrientationChanged: { console.log("*** Screen
>> Orientation: " + orientationEnumToText(orient)); }
>> 
>> The only time I see this is immediately after my QML app is run
>> using qmlscene. The orientation value is the default value,
>> namely Qt.PrimaryOrientation. I'm confused why I'm not getting
>> any other signal calls from my QPA implementation in my QML app?
>> I've also set the orientationUpdateMask in my QPA plugin by
>> calling setOrientationUpdateMask() and passed it all 4 major
>> orientations.
>> 
>> What else do I need to do to get my signal handler in my QML app
>> to be called every time the orientation changes in the QPA
>> plugin?
> 
> Sorry for the silence; it's a little early to answer this very
> specifically, because we are just now implementing it on a couple
> of platforms, and there are differences between them.
> 
> So you are writing a new QPA plugin?  Is this for Mir?

So I figured out the solution, and it was that I need to set the
update mask within my application. This works in my case since it was
a C++/QML app, but if you're writing a pure QML app, currently you
can't set the update mask and Screen.onOrientationChanged will not get
signaled.

This is for the Ubuntu Touch platform.

Thanks,

Jim

> 
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