[Qt-qml] Application usable area dimensions

Fri Aug 20 02:38:11 CEST 2010

So how is implicit, read-only parent property different from just wrapping your application inside an invisible item:

Item {
    id: window
    Rectangle {
       width: parent.width
       height: parent.height
    }
}

Also, in most cases, regardless of how your application layouts itself for various screen sizes,  you want to have at least one paintable item (Rectangle, Image, etc.) to cover the whole scene area (screen, window, a widget inside a window, whatever is reserved for your QDeclarativeView). The root item is a logical place for it.

Cheers,

Joona

From: qt-qml-bounces at trolltech.com [mailto:qt-qml-bounces at trolltech.com] On Behalf Of ext Jason H
Sent: Friday, August 20, 2010 1:59 AM
To: Hartz Henrik (Nokia-MS-Qt/Oslo); Turvey Simon (Nokia-MS/London)
Cc: qt-qml at trolltech.com
Subject: Re: [Qt-qml] Application usable area dimensions

-- I hit send too soon --

"By setting the resize mode of the QDeclarativeView to SizeRootObjectToView, the top-level item is automatically resized to the window size. In the worst case, this is exactly what you are asking for except that you need an extra Item. In the common case, i.e. in both examples here so far, The current behavior give you what you want without even the extra lines. It is not the behavior of QmlViewer though, and so you will need your own application. Perhaps what you really want is to have a command line flag for QmlViewer which makes it act like this?

If your suggestion actually means the window size, and not the widget size, then that would need a very separate solution for the case where the QDeclarativeView is not the top-level widget (and the current solution is fine for the case where it is)."

The problem is that with the current scenario, the first item does not know its allocated size. We want to be able to READ it. Writing it blindly is not acceptable.  What if the root item doesn't care, and only wants to size itself relative to the allocated dimensions?

By having parent, we can see how many pixels are available, so that we can scale items to the view rect. Or,  by having a parent, we can use parent anchors ont he right or bottom for tool bars. (We ca guess zero in other cases)

It makes it easier to deal with various resolution devices, without having to write QML screens hand-adjusted for every one.

________________________________
From: "henrik.hartz at nokia.com" <henrik.hartz at nokia.com>
To: simon.turvey at nokia.com
Cc: scorp1us at yahoo.com; qt-qml at trolltech.com
Sent: Wed, August 18, 2010 5:18:44 AM
Subject: Re: [Qt-qml] Application usable area dimensions
http://bugreports.qt.nokia.com/browse/QTBUG-12967

On Aug 18, 2010, at 9:21 AM, Turvey Simon (Nokia-MS/London) wrote:

Gosh, that's a lovely idea.

+1

-----Original Message-----
From: ext Jason H [mailto:scorp1us at yahoo.com]
Sent: 17 August 2010 15:48
To: Hartz Henrik (Nokia-MS-Qt/Oslo); Turvey Simon (Nokia-MS/London)
Cc: qt-qml at trolltech.com<mailto:qt-qml at trolltech.com>
Subject: Re: [Qt-qml] Application usable area dimensions

Wouldn't it make sense to just have an implicit parent that is the window size?

So in QML:
Rect {
width: parent.width
height: parent.height
}

----- Original Message ----
From: "henrik.hartz at nokia.com<mailto:henrik.hartz at nokia.com>" <henrik.hartz at nokia.com<mailto:henrik.hartz at nokia.com>>
To: simon.turvey at nokia.com<mailto:simon.turvey at nokia.com>
Cc: qt-qml at trolltech.com<mailto:qt-qml at trolltech.com>
Sent: Mon, August 16, 2010 2:01:51 PM
Subject: Re: [Qt-qml] Application usable area dimensions

Hi,

you're not looking for
http://doc.qt.nokia.com/4.7-snapshot/qdeclarativeview.html#ResizeMode-enum
(potentially combined with QWidget::showFullscreen) by any chance? this is what
qmlviewer (potentially with -fullscreen) also does for you.

Cheers,
Henrik

On Aug 16, 2010, at 1:34 PM, ext simon.turvey at nokia.com<mailto:simon.turvey at nokia.com> wrote:

Cool. That'll work. Thanks.

Still might be useful to have more readily available though. A bit like
orientation is available through the 'runtime' property when using the QML
viewer.

-----Original Message-----
From: qt-qml-bounces at trolltech.com<mailto:qt-qml-bounces at trolltech.com> [mailto:qt-qml-bounces at trolltech.com] On
Behalf Of ext Romain Pokrzywka
Sent: 16 August 2010 11:54
To: qt-qml at trolltech.com<mailto:qt-qml at trolltech.com>
Subject: Re: [Qt-qml] Application usable area dimensions

If you have access to the QDeclarativeEngine, you can get that information very
easily by importing the QDesktopWidget from QApplication into the qml root
context, e.g. :

   QApplication app(argc, argv);
   QDeclarativeView view;
   view.engine()->rootContext()->setContextProperty( "desktop", app.desktop()
);

and then in your qml file e.g. :

   Rectangle {
       width: desktop.width; height: desktop.height
   }

Cheers,
Romain

--
Romain Pokrzywka | romain.pokrzywka at kdab.com<mailto:romain.pokrzywka at kdab.com> | Certified Qt Software Engineer &
Trainer Klarälvdalens Datakonsult AB, a KDAB Group company Tel. Sweden (HQ)
+46-563-540090, USA +1-866-777-KDAB(5322) KDAB - Qt Experts -
Platform-independent software solutions

On Monday 16 August 2010 10:54:50 simon.turvey at nokia.com<mailto:simon.turvey at nokia.com> wrote:
Hi all,

Rather than hard coding the screen size in my QML, is there a way of
retrieving the application usable area? That is, the dimensions
available to the application once system ui furniture has been taken into
account?

Regards,

Simon

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