adapting scrollarea when you expand or decrease intern widget

Albator

Hello all people :)

I'm looking to expand widgets inside a scroll area.

Enlarging widgets is easy but adapting the scroll area to the new size of the widgets it contains is a bit trickier.

if you have idea, it's cool !

SGaist

Hi,

Can you explain what do you mean by adapting the scroll area ?

Albator

okay, with picture it's more explicative

first i have this :

3 widgets "graph" in a scroll area.
with grow graph i expand the 3 widgets in the scroll area.

void MainWindow::on_grow_clicked()
{
    int w,h;
    w=2500;
    h=600;

    QSize grow_size(w,h);

    ui->graph->resize(grow_size);
    ui->graph2->resize(grow_size);
    ui->graph3->resize(grow_size);

    //ui->scrollAreaWidgetContents->update();

}

the 3 widgets grow correctly but :

it's not perfect, i would like this when i grow graph :

with the scroll vertical

JonB

@Albator
You do not tell us how you are creating/adding your widgets. a QScrollArea only accepts a single widget to scroll, you talk about your 3 widgets, how are you adding those on the scroll area?

Further, we do not know what your QScrollArea::setWidgetResizable() setting is.

https://stackoverflow.com/questions/12781407/how-do-i-resize-the-contents-of-a-qscrollarea-as-more-widgets-are-placed-inside may be useful reading for you.

Albator

I added it from the mainwindows.ui design interface and drop the widgets in the scroll area.

JonB

@Albator
I don't know what code that generates. Did that create a "holding" QWidget to drop your widgets onto? Did you put a layout onto that "holding" widget when you added your sub-widgets? Also what about the setWidgetResizable() setting? Did you look at the SO link?

Albator

okay so :
1-
when i create a scroll area with the design interface I don't know how to look at the code it created.
2-

yes, in the scroll area i have put a vertical layout.
3-

is enable
4-
What is SO link ?

sorry in advance for my ignorance !

JonB

@Albator
That stuff look about right.
The SO (StackOverflow) link was the

https://stackoverflow.com/questions/12781407/how-do-i-resize-the-contents-of-a-qscrollarea-as-more-widgets-are-placed-inside may be useful reading for you.

I think you should read that, though I believe you have done the necessary.

//ui->scrollAreaWidgetContents->update();

I think you should try ui->scrollAreaWidgetContents->adjustSize() in case that resolves.

I admit at this point I'm not sure! I try playing about with scroll settings till they work :) I don't know why you are getting a horizontal scrollbar but not a vertical one.

Albator

I'll look at the SO link ;)
then it's just in case I enlarge the widgets during the application run with the "grow graph" button.

By setting the minimunsize parameter of my graph widgets to very wide and very high without using the buttons, the scroll area works fine so it's probably possible.

parameters widgets graph :

and the result :

the problem it's just when i use the resize with button.

i will try with adjustsize :)

EDIT :
adjustsize() doesn't work

SGaist

I might be wrong but it looks like you are not using a layout on scrollAreaWidgetContents_2, are you ?

Albator

of course i do

Albator

i up the post

SGaist

Then maybe another silly question: are you sure your widgets are put in that layout ?

Albator

to be sure I did a test I changed the shape layout to see if the widgets would follow the modification.
And yes if I change the layout vertically my widgets adapt and the same for other formats, which proves that the widgets are in this layout.