Brilliant, good information for my task, thanks!
Currently, I have an implementation in C++ to add items to the view and I can
use mouse-clicks. Now,
I have one problem, how can I resize my parent item/rectangle to a fitted size,
depending on the
elements in my list? A screenshot is here [1].
I tried to use methods of QList, like count() to get the count of elements and
to resize the view
then, unfortunately count() does not exist.
And in QML I use:
[QML]
// Area for service elements.
Item {
anchors.top: hostTop.bottom;
anchors.topMargin: 10;
x: 30;
Column {
spacing: 1;
Repeater {
model: modelServices;
Service {
serviceName: model.modelData.name;
iconPath: model.modelData.iconPath;
textColor: model.modelData.color;
}
}
}
//parent.height: modelServices.count * 20;
} // Item
[/QML]
Suggestions?
[1] http://christianbenjaminries.de/dl/_qml_/question01.png
Am 10/09/11 01:09, schrieb [email protected]:
> My first medium-sized-ish QML application was one very similar to what you're
> proposing, and the approach worked very well. Two comments...
> You'll want to use a C++ model to back your UI for your network resources;
> that way you can update the model from C++ and the UI will automatically
> redraw. You'll want to create a subclass of QAbstractListModel, or use a
> subclass like QStandardItemModel (which is fine for general lightweight
> work), and jam that puppy into your QML context
> (http://doc.qt.nokia.com/4.7-snapshot/qtbinding.html#embedding-c-objects-into-qml-components,
> http://www.lothlorien.com/kf6gpe/?p=160). Using a model is preferable to
> using QList<T>, because as the model changes, it signals to the UI to change
> automatically. In my case, I created a QStandardItemModel subclass that was a
> back-end listening to QtDBus notifications, so signals on the DBus propagated
> to, and seamlessly updated, my QML interface. It worked very well.
>
> You can wire stuff back to your C++ app from your QML's ListView delegate by
> using a MouseArea that dispatches to a Q_INVOKABLE property on an object
> shared between C++ and QML; see the previous links as well. I found it
> pretty handy (if a bit sloppy) to make my application controller class
> available in QML, and then just put some Q_INVOKABLE methods on it so that
> the QML could trigger state changes in the app controller logic. So your app
> controller could have a Q_INVOKABLE method "doSomething" that the MouseArea
> onClicked handler invokes, passing whatever info from the current item of the
> model is necessary to your application logic.
>
> Hope that helps!
>
> Cheers,
> R.
>
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of
> ext Christian Benjamin Ries
> Sent: Wednesday, September 07, 2011 6:17 AM
> To: [email protected]
> Subject: [Qt-qml] Possibility of an implementation approach?
>
> Hello all together!
>
> I rechecherd a little bit and checked out the possibilities of QML,
> everything sounds nice and easy to apply. I already checked how I can add an
> QML declarative object to a GraphicScene and how I could move them around.
>
> Now I stuck, I've no idea if I can use QML efficiently in my project.
>
> Here a small description of my task:
>
> - I have to create a graphical view of some elements, e.g. a host with
> included childs like network-interface cards.
>
> - These hosts could have descriptions for file-shares, and I like to add them
> to the host on the fly by a C++-programm, and the view sould be repaint in
> the QGraphicalView.
>
> - I have seen, that I can add a list<T> in QML, could I add elements to this
> list by C++? If yes, could you give me an example or a link to one example?
>
> - Furthermore, when I click a one MouseArea I like to use this click-Signal
> in my C++-programm, but there is no available example on the Qt's-website,
> right?
>
> I really like to use QML, because it could safe a lot of time! Because their
> is no need to create items of all elements with a QGraphicsItem based
> spezialization, and the calculation of all positions and so on...
>
> I really checked the web and Qt's documentation, but the available examples
> covers not really an example how I could do the mentioned implementation
> things.
>
> Suggestions will be welcome(!)
>
> All the best, Christian
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--
Dipl.-Ing. (FH) Christian Benjamin Ries, M.Sc.
University of Applied Sciences Bielefeld
Department of Engineering Sciences and Mathematics
Computational Materials Science& Engineering (CMSE)
Wilhelm-Bertelsmann-Str. 10, D-33602 Bielefeld
Office: 202 (WBSII)
Phone: +49 521 106-71222
Fax: +49 521 106-71241
Web: www.christianbenjaminries.de
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