ui->addTab "index out of range" !?

[Niagarer]

@SGaist
No, I click Start Debugging
(but as I see now, there is Output in Modules tab when I am not closing the error message but it doesn't matter I think)

[Niagarer]

@SGaist
UPDATE
Ok now I know, there are two points in my function, where the program crashes.
My function:

    GraphWidget *newGraphWidget = new GraphWidget(this);
    graphWidgets.append(newGraphWidget);
    QString name = "tab " + QString::number(tabCounter);

    qDebug() << ui->Graph->currentIndex();

    //ui->Graph->addTab(newGraphWidget, "title");          // !? PROBLEM !?

    qDebug() << ui->Graph->currentIndex();


    tabCounter += 1;

    QVBoxLayout *vBoxLayout = new QVBoxLayout();
    vBoxLayout->setAlignment(Qt::AlignTop);
    QWidget *allNodesWidget = new QWidget();
    allNodesWidget->setLayout(vBoxLayout);
    //ui->allNodes_scrollArea->setWidget( allNodesWidgets[ui->Graph->currentIndex()] );     // !? PROBLEM !?
    allNodesWidgets.append(allNodesWidget);

The two lines where I commented !? PROBLEM !? are the two lines. If I uncomment one of these, the program crashes with the Index error. (UPDATE: the second one is because ui->Graph->currentIndex() is -1)
I have really no Idea what this means...
Help please!

[Vinod Kuntoji]

@Niagarer ,

What is the initial value of tabCounter? What is the vector size?

[VRonin]

This post is deleted!

[VRonin]

allNodesWidgets[ui->Graph->currentIndex()]

ui->Graph->currentIndex() is almost certainly out of bounds

[Niagarer]

@VRonin
Oh, yes you are right, thanks.
But it unfortunately does not solve teh actual problem :/

[Niagarer]

@Vinod-Kuntoji
The initial value of TabCounter is 0.
The vector has no specific size, it gets bigger when I add new items... what exactely do you mean?

[Paul Busovikov]

@Niagarer when you add new tab it do not mean that current index will be changed

[Niagarer]

@Paul-Busovikov
Yes...?
To get sure I wrote

    qDebug() << ui->Graph->currentIndex();

before and after adding a new tab

[Niagarer]

To make it easier:
the line

    ui->Graph->addTab(new QWidget(this), "hello");

does not work. Doesn't matter where I call it.

[mrjj]

@Niagarer
a QWidget is not really visible. (it paints nothing)
Try with other type

[Niagarer]

@mrjj
Ok.
This also does not work:

    GraphWidget *newGraphWidget = new GraphWidget(this); //GraphWidget is a QGraphicsView
    ui->Graph->addTab(newGraphWidget, "hello");

[mrjj]

@Niagarer
this works here
ui->tabWidget->addTab( new QPushButton("kkk") ,"tab" );

[Niagarer]

@mrjj
It doesn't work in my Program... xD
What the hell...

[Paul Busovikov]

@Niagarer yes it doesn't

 int index = 0;
     for (int i = 0; i < 10; ++i )
     {
          index = ui->tabWidget->addTab( new QWidget, "title" );
          qDebug() << index << "  " << ui->tabWidget->currentIndex() ;
     }

0    0
1    0
2    0
3    0
4    0
5    0
6    0
7    0
8    0
9    0

[mrjj]

Hi
I assume you are doing other stuff in your app since it crashes.

Just to be sure, your Qt is not sick.
Can you try test project
https://www.dropbox.com/s/tpyxmww5t98i4um/untitled39.zip?dl=0

[Niagarer]

@Paul-Busovikov
Oh yes, I see, I'm sorry.

[Niagarer]

@mrjj
Yep, it works

Yes, I duplicated an old project. And now the MainWindow sould create a new tab in the tab widget called Graph with an object of my class GraphWidget (QGraphicsView). Nothing else (in the constructor).

[mrjj]

Ok, all good then (with your Qt) :)
It should be no different inserting a QGraphicsView subclass

[Niagarer]

@mrjj
I'm not sure if I understood that correctly...
In the old project GraphWidget is just a normal Widget. Here it is a QGraphicsView. Where is the mattering difference?