Adding a GraphicsScene into a QLabel

chrisLucr

I have a problem displaying two labels, the label "label" is displayed with no problem ( it has some buttons adjusted Horizontally ) and the second label "label1" is not being displayed ( it contains a scene which has a view , in the scene i have a title and a picture ). This is the code i am trying to use.

widget1 = new QWidget;
setCentralWidget(widget1);

label1 = new QLabel(widget1);
scene = new QGraphicsScene(label1);
vue = new QGraphicsView(scene);
label1->move(100,100);

label = new QLabel(widget1);
layout = new QHBoxLayout(label);
label->resize(500,100);

It's my first time using QGraphicsScene/View and it is confusing me a little bit.

jsulm

@chrisLucr Do you call

label1->show();

somewhere?
Also, why do you use QLabel to embed QGraphicsScene? Why not a simple QWidget?

chrisLucr

On my main.cpp i am using w.show(); with w is my MainWindow where i have put the label the scene and the central widget . I am kind of new to qt so i don t know a lot of things , is using a QWidget will make the work easier ?

jsulm

@chrisLucr QLabel is usually used to show text and images, for QGraphicsScene I would use QWidget.

J.Hilk

hi @chrisLucr and welcome

I think you're confusing some things.

The GraphixsView object will show/display your QGraphicsScene

What you did was creating a Scene and a view as children of your QLabel. But that will not lead to automatic resizing of the QGraphicsView nor to an automatic show() call.

this, for example, will create and show a QScene inside a view

QGraphicsScene scene;
scene.addText("Hello, world!");

QGraphicsView view(&scene);
view.show();

I assume, you can simply add your QGraphicsView to a layout, no need to go the way over a Label.

chrisLucr

i have tried this ,
but it does not work too,
i still can t see the scene in my window, all i am seeing are the buttons i have made
( the picture show exactely what i am trying to do : )
```

widget2 = new QWidget(widget1);
    scene = new QGraphicsScene(widget2);
    vue = new QGraphicsView(scene);

jsulm

@chrisLucr you still don't call show()...

chrisLucr

well i have tried it and i deleted the line (view.show();) since i don t need two windows to appear but still does not work , i am trying to display the scene/view on the same window as the other labels.
@jsulm i don t call it cause when i do two windows appear when i need only one. this is the code in my main.cpp where i am showing the window ( i think it does the job ?? )
```
QApplication a(argc, argv);
MainWindow w;
w.show();

return a.exec();

jsulm

@chrisLucr What about giving your view a parent widget, so it is not shown in its own window?

widget2 = new QWidget(widget1);
scene = new QGraphicsScene();
vue = new QGraphicsView(scene, widget2);
widget2->show();
vue->show();

chrisLucr

Thanks a lot @jsulm , it is working fine now
really appreciate it

Pablo J. Rogina

@chrisLucr if your issue is solved, please don't forget to mark your post as such. Thanks

chrisLucr

Thanks i did not know if it exists . it will be done