Scroll Area

[Alfie Anil]

Hello Everyone,
What I'm trying to do, is when on scroll area is moved, another scroll area moves by the same amount. Is this possible?
Thanks in advance

[mrjj]

Hi
Yes you can do something like

connect(view1->horizontalScrollBar(), SIGNAL(valueChanged(int)), view2->horizontalScrollBar(), SLOT(setValue(int)));
connect(view2->horizontalScrollBar(), SIGNAL(valueChanged(int)), view1->horizontalScrollBar(), SLOT(setValue(int)));

https://stackoverflow.com/questions/12304293/synchronize-scrollbar-in-qt

[Alfie Anil]

Hi, i've implemented that and I'm sure that will work. But i seem to have a problem when compiling. I have added this in my widget.cpp file and and gives me an error message saying 'No matching member function for call 'connect''.
Any ideas?
thanks

[mrjj]

@Alfie-Anil
HI
its hard to guess on without the code.
Could be one of the parameters or that it's not inside a QObject based
class.

[Alfie Anil]

Hi this is the code. I've noticed that when I don't use the 'ui->' in a connect it works. however, do have to use it... This is the code:
```
ui->scrollArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->scrollArea->setWidgetResizable(true);
ui->scrollArea_2->setWidgetResizable(true);

QWidget *widget = new QWidget();
QWidget *newwidget = new QWidget();

ui->scrollArea->setWidget(widget);
ui->scrollArea_2->setWidget(newwidget);
QPushButton *button = new QPushButton();

qDebug() << "Initialised widget to scroll area";

connect(ui->scrollArea->verticalScrollBar(), SIGNAL(valueChanged(int)), ui->scrollArea_2->verticalScrollBar(), SLOT(setValue(int)));

[mrjj]

Hi
Its one of the sneaky ones.
you need to add
#include "QScrollBar"

in top file file for it to know the type returned by
->verticalScrollBar()

It does give a hit with "incomplete" type
but still sneaky :)

[Alfie Anil]

@mrjj
Thank you. I've now got a new problem that says the program ended unexpectedly, when i set a style sheet for anything in the widget.ui
Any ideas? Thanks

[mrjj]

@Alfie-Anil
You right clik in the UI file and use Change stylesheet or what you do ?

[Alfie Anil]

I right click on the scroll area that I have added and then click change stylesheet.

[Alfie Anil]

I've just got another problem. It says QObject::connect: No such signal QObject::valueChanged(int)

anyideas?

connect(ui->scrollArea->verticalScrollBar(), SIGNAL(valueChanged(int)), ui->scrollArea_2->verticalScrollBar(), SLOT(setValue(int)));

[mrjj]

Hi
It compiles for me.
Try to do a build -> clean and
rebuild all.