I added a "resize"-method and call this when I add elements. Is this a good
approach or does QML
support something like this native?
[QML]
width: baseWidth; height: baseHeight;
function resizeHost() {
hostItem.height = repeaterServices.count * 20 + baseHeight;
}
Column {
spacing: 1;
Repeater {
id: repeaterServices;
model: modelServices;
Service {
objectName: "service" + index;
serviceName: model.modelData.name;
iconPath: model.modelData.iconPath;
textColor: model.modelData.color;
}
}
}
[/QML]
[CPP]
QMetaObject::invokeMethod(objectHost, "resizeHost");
[/CPP]
Am 10/09/11 14:22, schrieb Christian Benjamin Ries:
> 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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