<![CDATA[How to make a QVector of a class usable for ui?]]>First things first: I'm very new in Qt, so it definately can be a stupid question.
I tried to make a QVector that contains Objects of a specific class. Problem here:

  1. I cant append dinamically new items (or I am just too stupid) like
myVector.append( new myClass(this) );
  1. I cant use the items from the QVector to setup ui like this:
ui->myGraph->addTab( myVector.last(), "xyz" );

(I also tried to do this stuff with a QVector of pointers etc. but I just got more problems)

Any Ideas?
Thanks for answers!

]]>https://forum.qt.io/topic/81793/how-to-make-a-qvector-of-a-class-usable-for-uiRSS for NodeTue, 09 Jun 2026 02:59:00 GMTFri, 28 Jul 2017 06:50:41 GMT60<![CDATA[Reply to How to make a QVector of a class usable for ui? on Fri, 28 Jul 2017 08:26:39 GMT]]>Ok, thank you all!
So, as you told me, I just had to use pointers.
When I useed normal objects (no pointers), I was not able to add the new item to the vector and use it as widget for the new tab.
The tab takes pointers, I'm sorry, I didn't see that (but, yup it makes sense).
So now, it looks like:

QVector<myClass*> myClasses;
myClass *testMyClass = new myClass(this);
myClasses->append(testMyClass);
ui->Graph->addTab( myClasses.last(), "xyz");

and it works yaay!
Thanks for all answers!

]]>https://forum.qt.io/post/407266https://forum.qt.io/post/407266Fri, 28 Jul 2017 08:26:39 GMT<![CDATA[Reply to How to make a QVector of a class usable for ui? on Fri, 28 Jul 2017 08:08:38 GMT]]>@Niagarer said in How to make a QVector of a class usable for ui?:

myVector is a vector of myClass objects

then why are you trying to append pointers?
It should be:

QVector<QWidget*> myVector;

as @J-Hilk said.
Be aware that you should really use pointers as QObjects are not copyable.

]]>https://forum.qt.io/post/407257https://forum.qt.io/post/407257Fri, 28 Jul 2017 08:08:38 GMT<![CDATA[Reply to How to make a QVector of a class usable for ui? on Fri, 28 Jul 2017 08:08:30 GMT]]>@Niagarer
hi
With Widgets the vector must be pointers.
Just as both @artwaw and @J-Hilk shows

You cannot store the actual widget in the list. must be with new and pointer.

]]>https://forum.qt.io/post/407256https://forum.qt.io/post/407256Fri, 28 Jul 2017 08:08:30 GMT<![CDATA[Reply to How to make a QVector of a class usable for ui? on Fri, 28 Jul 2017 08:03:11 GMT]]>@jsulm
Yes, I'm sorry.
myVector is a vector of myClass objects.
myClass is a custom QWidget Class.
I want to create a new object of myClass when I add a new tab in the window and store it in the QVector.

]]>https://forum.qt.io/post/407252https://forum.qt.io/post/407252Fri, 28 Jul 2017 08:03:11 GMT<![CDATA[Reply to How to make a QVector of a class usable for ui? on Fri, 28 Jul 2017 08:06:34 GMT]]>@Niagarer you haven't jet shown us, how you create/define your QVector.

something like this:

QVector<QWidget*> myVector;

QWidget *w = new QWidget(..);
myVector.append(w);

defenitly work.

]]>https://forum.qt.io/post/407251https://forum.qt.io/post/407251Fri, 28 Jul 2017 08:06:34 GMT<![CDATA[Reply to How to make a QVector of a class usable for ui? on Fri, 28 Jul 2017 07:58:09 GMT]]>@artwaw
Thanks for the answer!
The problem here is, that I want to add new items dynamically. When I click a button, it should add a new item.
because of that, I tried to do it the way I showed above (with no specific name, because I dont want to change an existing item, I want to create a new one).

But I still can not append it to my vector. it says:

error: no matching function for call to 'QVector<myClass>::append(myClass*&)'
myClasses.append(testMyClass);

The second problem is, that it says

error: no matching function for call to 'QTabWidget::addTab(myClass&, QString&)'
ui->Graph->addTab(myClasses.last(), "xyz");

when I try to use the last item of myClasses to set the widget (myClass is a widgetClass) of a new tab.

Kind Regards!

]]>https://forum.qt.io/post/407250https://forum.qt.io/post/407250Fri, 28 Jul 2017 07:58:09 GMT<![CDATA[Reply to How to make a QVector of a class usable for ui? on Fri, 28 Jul 2017 07:36:51 GMT]]>@Niagarer You should show more code: what is myVector exactly?
"I cant append dinamically new items (or I am just too stupid) like" - what exactly is the problem/error?

]]>https://forum.qt.io/post/407243https://forum.qt.io/post/407243Fri, 28 Jul 2017 07:36:51 GMT<![CDATA[Reply to How to make a QVector of a class usable for ui? on Fri, 28 Jul 2017 07:27:10 GMT]]>Hi.
You can store pointers to objects this way. In example:

MyClass *myObj = new MyClass(this);
myVector.append(myObj);

However the question is: what exactly would you like to get from 2)? I mean - what's your use case?

]]>https://forum.qt.io/post/407239https://forum.qt.io/post/407239Fri, 28 Jul 2017 07:27:10 GMT